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In this work, thin reduced graphene oxide (GO) composite films were fabricated for electromagnetic interference (EMI) shielding application. High solid content GO slurry (7 wt %) was obtained by dispersing GO clay in polymer solution under high-speed mechanical stirring. A composite film with varied thickness (10-150 μm) could be fabricated in pilot scale. After an optimized thermal annealing procedure, the final product showed good conductivity, which reached 500 S·cm

Imidazole is a five-membered heterocyclic ring containing three carbon atoms, two nitrogen atoms, and two double bonds. Among two nitrogen atoms, one of which carries with a hydrogen atom is a pyrrole-type nitrogen atom, another is a pyridine type nitrogen atom. Hence, the imidazole ring belongs to the π electron-rich aromatic ring and can accept strong suction to the electronic group. Moreover, the nitrogen atom of the imidazole ring is coordinated with metal ions to form metal-organic frameworks. In recent years, because of imidazole compounds' unique optical properties, their applications have attracted more and more attention in optical analysis. Thus, this review has summarized the synthesis, characterization, and application with emphasis on the research progress of imidazole compounds in optical analysis, including fluorescence probe, colorimetric probe, electrochemiluminescence sensor, fiber optical sensor, surface plasmon resonance, etc. This paper will suggest the direction for the development of imidazole-containing sensors with high sensitivity and selectivity.

A novel chiral separation membrane was fabricated by assembling l-cysteine (l-Cys)-modified graphene oxide sheets. l-Cys modification leads to an enantiomer separation membrane with an accessible interlayer spacing of 8 Å, which allows high solvent permeability. In the racemate separation experiments under isobaric conditions, the enantiomeric excess (ee) values of alanine (Ala), threonine (Thr), tyrosine (Tyr), and penicillamine (Pen) racemates in the permeation solution were 43.60, 44.11, 27.43, and 46.44%, respectively. In the racemate separation experiments under negative pressure, the separation performances of Ala, Thr, and Tyr were still maintained, and the enantiomeric excess (ee) values of the filtrate after separation were 56.80, 54.57, and 32.34%, respectively. These results indicate that the as-prepared GO-Cys membrane has a great practical value in the field of enantiomer separation.

In this study, a novel and highly efficient “turn-off” fluorescence imidazole-based sensor (BIB) with a symmetric structure was synthesized by a four-step reaction, from o-phenylenediamine, 6-bromo-2-pyridinecarboxaldehyde, and 1-bromohexane. The sensing mechanism was confirmed via fluorescence titration, HRMS, and 1HNMR techiniques. The results showed that the binding ratio of BIB and Ag+ was 1 : 1 in a DMF-HEPES (pH 7.4) solution (9 : 1, v/v). The fluorescence response of BIB exhibited a good linear response within the Ag+ concentration ranging from 2 × 10−7 to 8 × 10−6 mol L−1, and the limit of detection was calculated to be 4.591 × 10−8 mol L−1. BIB was successfully applied to the detection of Ag+ in water samples with recoveries of 97.25–109.50% and relative standard deviations (RSD) of 1.14–2.45%. In addition, BIB can successfully be applied to qualitatively and quantitatively identify Ag+ in water by test paper strips of BIB, which is fast and convenient. This provides a possible potential for the rapid monitoring of metal ions by sensors in environmental research.

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In this work, a large-scale preparation of graphene oxide (GO) film is reported, and the structure and the compositional variation was studied after thermal annealing. The electromagnetic interference (EMI) shielding performance of thermally reduced GO films was also investigated. Commercial GO clay was well dispersed by high-speed shearing and formed a stable slurry with a high solid content in water (5%), and this was chosen rather than organic solvent due to its optimal performance in coating procedures and film quality. The optimized thermal annealing procedure resulted in a significant enhancement of electric conductivity and EMI shielding efficiency, which reached 500 S cm−1 and 32–42 dB with the thickness under 0.1 mm. The excellent EMI shielding efficiency of thermally reduced GO film, as well as the easily amplified pilot manufactoring procedure adaptive to commercial equipment, produce graphene for universal EMI shielding materials.

Heterovalent substitution of the Pb(II) cation of CsPbBr3 perovskite nanocrystals (PNCs) with Sb(III) cation is developed as an internal engineering strategy to tailor their optoelectrical properties. Partially replacing Pb(II)–Br bonds of cubic CsPbBr3 PNCs with stronger Sb(III)–Br bonds can not only enlarge the band gap and preserve the highly-passivated surface states of parent PNCs but also enable the obtained Sb(III)–CsPbBr3 PNCs with both blue-shifted and enhanced absorbance, photoluminescence, and electrochemiluminescence as well as boosted electron and hole-injection responses via electrochemical redox. The enhanced absorbance and radiative charge transfer originate from both the increased vacancies in crystals and the impurity states in the band gap of PNCs upon substituting Pb(II) with Sb(III) because the increased vacancies are more favorable to recombine the electrons injected via photoexcitation and/or electrochemical redox, while suitable impurity states in the band gap of PNCs also facilita...

Lithium–sulfur (Li–S) batteries are considered as a next-generation energy storage solution thanks to the dramatic increase in their energy density and the accompanying low fabrication cost. Nonetheless, their practical applications have been hampered by critical challenges such as cycling instability, low sulfur utilisation and efficiency. Here, the interfacial growth of Ni(OH)2-encapsulated sulfur nanoparticles in a reduced graphene oxide free-standing matrix as Li–S cathodes has been highlighted, along with a detailed application investigation of the sandwich foam structure in Li–S batteries. Compared to sulfur composites based solely on a graphene host (S@rGO), this composite foam cathode could provide significant improvements in specific capacity and long-cycle stability with the effective confinement and promoted conversion of lithium polysulfides. Moreover, the sandwich foam composite cathode exhibits a high specific capacity of 1189 mA h g−1 (0.1 C), better rating performance (691 mA h g−1 at 2 C) and remarkable cycling stability, retaining 81% of the initial capacity after 200 cycles of charge–discharge at 0.2 C. Furthermore, Ni(OH)2 wrapping at the cathode–electrolyte interface offers vastly improved polysulfide shuttle suppression, which provides a new cathode encapsulation method for further developments of advanced Li–S cathodes.

Electrosorption is an electrochemically enhanced adsorption, and only a few researchers reported the application of this technology for enhanced removal of organic pollutants. Herein, we report a k...

In this work, the synthesized MXene (Ti3C2Tx) exhibited large specific area, biocompatibility, excellent electronic conductivity, and good dispersion in aqueous phase. The Chit/ChOx/Ti3C2Tx nanocomposite was prepared through the continuous self-assembled process. Its structure is characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Moreover, the biosensor for cholesterol detection was fabricated via a one-step dip-coating method. Chit andTi3C2Tx act as a support matrix to immobilize ChOx enzyme, and also play a role in increasing the electrical conductivity. Meanwhile, the addition of redox mediator (Fe(CN)63-/4-) facilitates the electron transport from the analyte to the modified electrode in the oxidation of cholesterol. The DPV response exhibited an increase in current with increasing cholesterol concentration. Under the optimum conditions, the DPV response of the biosensor indicated a good linear relationship with the concentration of cholesterol ranging from 0.3 to 4.5 nM with a low detection limit of 0.11 nM, and a high sensitivity of 132.66 μA nM−1 cm−2. In addition, with favorable selectivity and stability, the biosensor has been used to detect cholesterol in real samples and the results demonstrate that the biosensor has excellent practicability.

The commercialization of Li-S batteries is hindered by the shuttling of lithium polysulfides (LiPSs), the sluggish sulfur redox kinetics as well as the low sulfur utilization during charge/discharge processes. Herein, a free-standing cathode material was developed, based on Fe-doped NiSe

A novel imidazoles fluorescent probe (2) was synthesized from vanillin, o-phenylenediamine, and N,N-diphenylcarbamyl chloride. Its structure was characterized by fluorescence spectra, UV–Vis spectra, 1H NMR, 13C NMR, and high-resolution mass spectrometry (HRMS). Moreover, its aggregation-induced emission (AIE) feature was investigated in THF/MeOH solution. Furthermore, the fluorescence quenching experimental results suggest that compound 2 is the potential fluorescent probe of small organic molecules showing high selectivity and sensitivity for nitroaromatic compounds. In addition, the probe could be applied in the determination of trifluralin with fast response and stability. The fluorescence response of the probe exhibited a good linear correlation with the concentration of trifluralin ranging from 10 to 100 μM, and the limit of detection (LOD) was as low as 5.066 μM. Finally, the probe was successfully utilized to determine the amount of trifluralin in real samples, and the recoveries were 91.1% to 111.2%, indicating the applicability and reliability of the probe.

In this work, chemical vapor deposition (CVD) method-grown graphene on plasma-etched quartz glass supported platinum nanoparticles (PtNPs/eQG) was constructed as an independent transparent electrode for non-enzymatic hydrogen peroxide (H2O2) detection. Graphene grown on quartz glass by the CVD method can effectively reduce the wrinkles and pollution caused by traditional transfer methods. The addition of the CF4 plasma-etched process accelerates the growth rate of graphene on quartz glass. The platinum nanoparticles (PtNPs) prepared by in situ sputtering have favorable dispersibility and maximize exposed active catalytic sites on graphene, providing performance advantages in the application of H2O2 detection. The resulting sensor's detection limit (3.3 nM, S/N = 3), detection linear range (10 nM to 80 μM) and response time (less than 2 s) were significantly superior to other graphene supported PtNPs materials in sensing of H2O2. In addition, the material preparation method was related to the non-transfer CVD method and in situ sputtering technology, allowing for the creation of independent electrodes without additional electrode modification processes. This primitive material preparation and electrode assembly process were promoted for the application and development of practical H2O2 sensors.

We report a facile water-in-oil (W/O) emulsion method to fabricate urchin-like reduced graphene oxide microspheres (UrGOMSs) with tunable sizes and structures. The success of this synthesis relies on the use of polyethyleneimine and ethylenediamine, acted as an emulsifier and weak crosslinker, respectively, to assist the formation of graphene hydrogel in emulsion droplets, followed by thermal treatment to remove the water. The diameter of the UrGOMSs could be controlled in the range of 2.30–4.58 μm by varying the water-oil ratio and thus the size of emulsion droplets. The UrGOMSs show crumpled surface and urchin-like structure with assembly of graphene nanosheets, which can supply large amount of accessible surface area and efficient ion diffusion pathways. The specific surface area of the structures is up to 356.33 m2 g−1 with high pack density of 1.37 g cm−3. When used as electrode materials in supercapacitors, the UrGOMSs exhibit high volumetric capacitance of 527.6 F cm−3 at 10 mV s−1 and 452.1 F cm−3 at 0.2 A g−1. Furthermore, they also exhibit excellent long-term cycling stability. After 5000 cycles, the capacity retention is around 99.43%. These results indicate the feasibility of the novel strategy for designing densely assembled graphene microspheres for supercapacitors.

Low cost, high activity and reliable stability are significant to the commercialization of fuel cell electrocatalysts. However, the synthesis of non-Pt anode catalysts with low cost, excellent performance and reliable stability is still a great challenge. Herein, we developed hollow graphitized carbon nanocages for improving the electrocatalytic performance of Pd nanoparticles (NPs) toward ethanol oxidation. A mild method was utilized for the preparation of hollow graphitized carbon nanocages (CN) using magnesium oxide as a sacrificial template without high-temperature processing. The CN can act as high-efficiency support for the distribution of Pd NPs. Pd NPs decorated on CN exhibited high catalytic performance with the current density of 2411.5 mA mg–1 for ethanol oxidation reaction, which is 1.84 and 4.42 times higher than reduced graphene oxide (1308.5 mA mg–1) and C (545.2 mA mg–1) as supports, respectively. The Pd/CN with excellent catalytic performance can be attributed to the CN, including the lar...

Sulfur dioxide (SO2) emissions must be efficiently controlled owing to environmental demands. An interesting approach for SO2 concentration is the use of ionic liquids (ILs) and subsequent detection by electrochemical methods. In this study, two kinds of IL ([EMIM][TfO] and [EMIM][BF4]) have been shown to absorb and desorb SO2, and the electrochemical behavior has been investigated by using nanoscale molybdenum disulfide (nano-MoS2)–modified electrodes. The corresponding absorption results showed that the MoS2-modified electrode is a good sensor for SO2 and that the ILs have a high SO2 absorption capacity. According to the SO2 desorption results, it was shown that desorption can be completed at approximately 140 °C under vacuum. Based on the high response signal of this modified electrode to SO2, it was utilized to detect the SO2 in haze. The results suggested that [EMIM][TfO] is able to absorb SO2 from haze with a higher selectivity and capacity than [EMIM][BF4]. Meanwhile, the MoS2-modified electrode was used to detect the concentration of SO2 in the air, which was consistent with the official results.

Transition-metal sulfides/selenides are explored as advanced electrode materials for nonaqueous sodium-ion capacitors, using FeS2–xSex as an example. A solid solution of S/Se in FeS2–xSex allows it to combine the high capacity of FeS2 and the good diffusion kinetics of FeSe2 together, thereby exhibiting excellent cycle stability (∼220 mA h g–1 after 6000 cycles at 2 A g–1) and superior rate capability (∼210 mA h g–1 at 40 A g–1) within 0.8–3.0 V. These results are much better than those of FeS2 and FeSe2, confirming the advantages of S/Se solid solution, as supported by EIS spectra, DFT calculations, and electronic conductivity. As FeS2–xSex is paired with the activated carbon (AC) as Na-ion capacitors, this device is also better than sodium-ion batteries of FeS2–xSex//Na3V2(PO4)3 and sodium-ion capacitors of metal oxides//AC, particularly at high rates. These results open a new door for the applications of sulfides/selenides in another device of electrochemical energy storage.

Copper indium sulfide (CuInS2, CIS) nanocrystals (NCs) are a promising solution to the toxic issue of Cd- and Pb-based NCs. Herein, electrochemiluminescence (ECL) of CIS NCs in aqueous medium is investigated for the first time with l-glutathione and sodium citrate-stabilized water-soluble CIS/ZnS NCs as model. The CIS/ZnS NCs can be oxidized to hole-injected states via electrochemically injecting holes into valence band at 0.55 and 0.94 V (vs Ag/AgCl), respectively. The hole-injected state around 0.94 V can bring out efficient oxidative-reduction ECL with a similar color to Ru(bpy)32+ in the presence of tri-n-propylamine (TPrA) and enable CIS/ZnS NCs promising ECL tags with l-glutathione as linker for labeling. The ECL of CIS/ZnS NCs/TPrA can be utilized to determine vascular endothelial growth factor (VEGF) from 0.10 to 1000 pM with the limit of detection at 0.050 pM (S/N = 3). Although the hole-injected state around 0.55 V is generated ahead of oxidation of TPrA and fails to bring out coreactant ECL, an...

We report a facile synthesis of wavy carbon nanowires (WCNWs) derived from polyurethane via KOH activation. The success of this synthesis relies on a carefully designed activation procedure, which involved one pre-activation stage to form suitable precursor and one high-temperature activation stage to allow directional carbon reconstruction. In particular, PU was initially mixed with KOH and thermally treated sequentially at 400 °C and 800 °C for 1 hour, respectively. The resultant products exhibit high purity in the shape of wavy wire, together with a uniform diameter of 51 ± 5.2 nm and the length in the range of 2–8 μm. Systematic studies have been conducted to investigate the effect of reaction parameters in two activation stages on the morphology and structure of final products. It is worth noting that the as-prepared WCNWs could find promising use in the field of both nanoparticle separation and catalysis. For example, they exhibit outstanding separation abilities towards Au nanospheres with different sizes and enhanced catalytic performance when serving as the catalyst support for Pd towards ethanol oxidation reaction. Particularly, the peak current density of Pd/WCNWs catalysts can reach 2126 mA mgPd−1 and the value of its electrochemical active surface area is 60.5 m2 gPd−1.

Recently, there has been an urgent need to develop new materials and technologies for extracting lithium ions. Herein, the membrane-type adsorbent of manganese dioxide (MnO2) is prepared by a vacuum filtration method using graphene oxide (GO) as a binder and amino-β-cyclodextrin (amino-β-CD) as an adjuvant. The results of thermogravimetric analysis show that MnO2 is successfully immobilized on GO layers with a content of about 24 wt%, which enabled rapid adsorb lithium ions from the ionic solution. In addition, the permeation experiment shows the membrane has specific selectivity for lithium ion transport and adsorption, which is manifested in the selectivity ratios of K+/Li+, Na+/Li+ and K+/Na+ to 2.5, 3.2 and 0.8, respectively. Adsorption experiments show that GO-β-CD/MnO2 membrane has a high adsorption capacity for lithium ions (37.5 mg g−1). The adsorption kinetic curve indicates that the lithium adsorption process is controlled by the chemical adsorption mechanism. In the enrichment experiment, the concentration of lithium ions from seawater can be enriched to 1.2 mg L−1 after 100 cycles. The results suggest that the developed GO-β-CD/MnO2 membrane could effectively extract lithium ions from seawater.

Although lithium-sulfur batteries have drawn widespread attentions due to their high energy densities at low costs, the scale-up applications are still hindered by issues such as dissolution of lithium polysulfides (LiPSs) and slow oxidation/reduction kinetics. Herein, we report a novel cathode composite composed of “moss-like” P-doped NiSe2 arrays grown on activated carbon cloth substrates (P-NiSe2/ACC). Experiments and DFT calculations together suggest that P-doping enhances the electron transfers between P-NiSe2 and LiPSs, leading to improved chemical adsorptions and catalytic effects towards the redox conversions of the active sulfur species. This effectively inhibits the shuttling of LiPSs and maximizes the utilization of sulfur towards high specific capacities and stable long-term cycling at high sulfur loadings. The strong interactions and effective catalysis of P-NiSe2 on LiPSs also enables three-dimensional growth of Li2S2/Li2S on the P-NiSe2/ACC cathode, realizing effective accommodation of volume expansions and significant alleviation of cathode passivation. As a result, the P-NiSe2/ACC cathode provides a high specific capacity of 1211 mAh g−1 at 0.2 C and an outstanding high-rate performance of 679 mAh g−1 at 3 C. At the high sulfur loading of 9.9 mg cm−2, an area capacity of 8.42 mAh cm−2 is achieved with stable cycling for 100 charge/discharge cycles.

Herein, we prepare Pt nanoparticles (NPs) attached on 3D porous embossed MXene (e-MXene) (Pt/e-MXene) for enhancing the catalytic performance and stability towards methanol oxidation reaction (MOR). The 3D interconnected porous structure was fabricated by using polystyrene (PS) microspheres as sacrificial template to effectively prevent the restacking of 2D MXene nanosheets for rapid electrical/ionic transport. Combining hydrophilic surface and reducibility of MXene, the Pt NPs were reduced. When applied as catalysts for MOR, the synthesized Pt/e-MXene composites exhibit prominently enhanced performances compared with Pt/e-MXene and JM Pt/C catalysts in terms of electrocatalytic activity and durability. This work opens a new guide on designing aggregation-resistant 3D porous MXene with high-performance in catalysis.

We describe a facile synthesis of Mn 3 O 4 nanoplates (NPs)-anchored graphene microspheres (GSs) and their applications as electrode materials for supercapacitors. The use of GSs as substrate significantly improve the electrochemical performance of Mn 3 O 4 , which can be attributed to unique spherical structure of graphene and excellent stability and anti-reunion of Mn 3 O 4 NPs. The success of this synthesis depends on the in situ reduction of Mn cations by carbon from GSs under hydrothermal conditions. The resultant Mn 3 O 4 NPs with an average thickness of 37 nm were uniformly distributed on the surface of GSs. Material characterizations, including XRD, Raman, FTIR and XPS, have been performed to confirm their shape, composition and structure. As a positive material, the as-prepared Mn 3 O 4 NPs/GSs composites exhibited excellent electrochemical property in a three-electrode system. In particular, their specific capacitance reached as high as 317 F g −1 at a scan rate of 10 mV s −1 , and a remarkable stability (about 100% retention of its initial capacitance) was achieve after 4000 galvanostatic charge-discharge cycles at the current density of 2 A g −1 . Therefore, Mn 3 O 4 NPs/GSs can have been used as an electrode material for supercapacitors.

Development of high-tapped-density graphene-based materials with satisfactory Brunauer–Emmett–Teller (BET) surface area can be beneficial to the optimization of the volumetric performance of supercapacitors for practical use. Herein, we report a simple and scalable route for the synthesis of high-tapped-density N-doped graphene (HNG). The success of this work relies on the use of polyethyleneimine (PEI) to react with graphene oxide under ambient conditions to realize fast cross-linking and thus rapid sedimentation, followed by thermal treatment of the precipitates. The resultant HNG exhibits a good balance between the tapped density and BET surface area, where the tapped density can be tuned in the range of 0.90–1.20 g cm −3 and the BET surface area is maintained in the range of 457.0–119.6 m 2 g −1 . The interaction between PEI and graphene oxide successfully prevents restacking of the graphene layers during thermal treatment while allowing maximal volume shrinkage. When applied as an electrode material in supercapacitors, the HNG exhibits a volumetric capacitance up to 547.8 F cm −3 at a scan rate of 10 mV s −1 and 317.3 F cm −3 at a current density 0.2 A g −1 , and it shows no apparent decrease in the specific capacitance after 5000 cycles at 2 A g −1 . The results demonstrate the feasibility of the new strategy for designing high-tapped-density graphene-based materials for supercapacitors.

In this paper, one nanoporous graphene grafting several zwitterionic polymer chains was designed as the osmosis membrane for seawater desalination. Using molecular dynamics simulation, the efficiency and mechanism of salt rejection were discussed. The simulated results showed that the zwitterionic polymer chains on nanoporous graphene can form the charge channel to block Na+ and Cl− ions pass through, and the slat rejection efficiency of functionalised graphene can reach to about 90%. In the simulation, the steric hindrance and electrostatic interaction are the main factors for the salt rejection. With time evolution, the charge channel formed by the soft polymer chains can decrease the effective pore area of membrane, leading to the increase of steric hindrance; the positive and negative centres of polymer chains can adsorb Na+ and Cl− ions under electrostatic interaction in the solution, contributing into the increase of charge density above the membrane. These conclusions are consistent with experimental report. Our designed osmosis membrane about the graphene is helpful for improving the potential application of defect graphene in water desalination and reducing the trouble of obtaining appropriate graphene sheet with small aperture.

The interactions of triangular silver nanoprisms (TAgNPrs) with bovine serum albumin (BSA) were investigated using multiple spectroscopic techniques. A noticeable absorbance increase was noted in the peak ranges of 250 to 300 nm for BSA, and the intensity increased with the increasing concentration of TAgNPrs. Furthermore, a slight blue shift of the surface plasmon resonance band of TAgNPrs occurred, indicating that the protein absorbed on the TAgNPrs surface to form a bio-nano interface. Analysis of fluorescence quenching data using the Stern-Volmer method revealed that static quenching takes place with complex formation. Evaluation of thermodynamic parameter ΔG θ for the binding processes indicated that the binding reaction was exothermic. Furthermore, the values of binding constant K revealed that the size of nanoparticles can affect the binding degree. The order of binding affinity is 43.7 nm > 36.2 nm > 25.1 nm. The competitive experiments of site markers (flufenamic acid and phenylbutazone) suggested that the binding site of TAgNPrs on BSA was located in the region of subdomain IIIA (Sudlow site II). In addition, the conformational changes of BSA by TAgNPrs were analyzed by using synchronous fluorescence spectra, circular dichroism, and three-dimensional fluorescence spectra.

Reduced graphene oxide hollow microspheres (rGO HMS) were encapsulated with gold nanoparticles (AuNPs) by spray drying. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman spectroscopy were used to characterize the AuNP/rGO HMS. When placed on a glassy carbon electrode (GCE), it exhibits excellent electrochemical catalytic properties towards the oxidation of nitrite. The electrocatalytic properties were studied using various electrochemical techniques. Compared to AuNP-decorated graphene sheet based electrodes documented in the literature, the one presented here provides a larger surface area. This enhances the catalytic activity towards nitrite. The electrode, typically operated at a working potential of 0.82 V (vs. SCE), has a linear response in the 5.0 μM to 2.6 mM nitrate concentration range, and a detection limit as low as 0.5 μM (at an S/N ratio of 3).

In this work, a glassy carbon electrode modified with Pt nanoparticles supported on chemical vapor deposition (CVD)-grown graphene (PtNPs/GR) was constructed and used to non-enzymatically detect ultralow concentrations of hydrogen peroxide. The application of in situ sputtering avoided not only the removal of surfactant from Pt nanoparticle surfaces, but also the complicated transfer of CVD-grown graphene. A PtNPs/GR free-standing film was fabricated by synergizing the good ductility of the CVD-grown graphene with the good dispersion and residual-free nature of the Pt nanoparticles. When compared with easily stacked and agglomerated powder graphene-supported Pt nanoparticles, the PtNPs/GR sensor with well-exposed active catalyst sites showed advantages in H2O2 detection. For example, the sensor showed a quick response of less than 3 s, and showed a lower detection limit (0.18 nM, S/N = 3) than did similar graphene-supported Pt nanoparticle materials. In addition, the preparation method involving CVD and sputtering allows for the large-scale production of this sensor and applications in practical electrochemical detection of hydrogen peroxide.