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Non-noble metal for surface plasmon resonance (SPR)-induced nano-enzymatic photoelectrochemical (PEC) biosensors is a promising method for broad applications. Non-noble metal bismuth (Bi) is gradually being valued for their properties such as non-toxicity, abundant reserves, and good catalysis. Meanwhile, metallic Bi nanoparticles (NPs) have superior SPR properties similar to that of noble metal. Therefore, a non-noble metal Bi/BiVO4 photoanode based on SPR was designed for the PEC detection of H2O2 in this work. The synergistic effect of BiVO4 with suitable band gap (2.5 eV) and Bi NPs with superior SPR effectively reduces the recombination of photogenerated electrons and holes, which significantly improves the PEC activity of Bi/BiVO4 electrode at low voltage. The in situ Bi/BiVO4/FTO photoelectrode not only exhibits a more comprehensive linear range of 0.005–2.6 mM with a lower detection limit of 2.0 μM but also possesses excellent selectivity for the determination of H2O2 because the coexisting substances are difficult to be oxidized at 0 V bias voltage. The investigation of Bi/BiVO4-based sensor has contributed to the development of non-noble metal for SPR-induced PEC biosensors. [ABSTRACT FROM AUTHOR]

As an organic–inorganic hybrid material, metal organic frameworks (MOFs) has a great development prospect in the field of photocatalysis. Herein, the in situ growth of Bi-based MOF (CAU-17) on Bi2WO6 was utilized to obtain Bi2WO6/CAU-17 photocatalyst by a simple solvothermal transformation method. Bi2WO6 can be used both as template and Bi source. The structure and morphology of Bi2WO6/CAU-17 composites were characterized by X-ray diffraction patterns, X-ray photoelectron spectroscopy, Fourier transform infrared spectra, UV–vis diffuse reflectance absorption spectra and scanning electronic microscopy, and transmission electron microscope. The results showed Bi2WO6/CAU-17 composites were successfully constructed by growing CAU-17 in situ on Bi2WO6. Compared with pure Bi2WO6 and CAU-17, Bi2WO6/CAU-17-1 h composite exhibited excellent photocatalytic activity for the degradation of Rhodamine B, and its rate constant was 0.02083 min−1. In addition, the quantum yield and space time yield of the obtained photocatalyst were 2.56 × 10−6 molecules/photon and 1.28 × 10−7 molecules/photon·mg, respectively. Bi2WO6/CAU-17 also exhibits better values of the modified FOM (figure of merit). This method provides a potential opportunity for the development of in situ growth of similar MOF materials for water treatment and other possible applications in the future. [ABSTRACT FROM AUTHOR]

In this work, we proposed to utilize three-dimensional porous copper foam (CF) as conductive substrate and precursor of in-situ growth CuO nanowires (NWs) for fabricating electrochemical nonenzymatic glucose sensors. The CF supplied high surface area due to its unique three-dimensional porous foam structure, and thus resulted in high sensitivity for glucose detection. The CuO NWs/CF based nonenzymatic sensors presented reliable selectivity, good repeatability, reproducibility, and stability. In addition, the CuO NWs/CF based nonenzymatic sensors have been employed for practical applications, and the glucose concentration in human serum was measured to be 4.96 ± 0.06 mM, agreed well with the value measured from the commercial available glucose sensor in hospital, and the glucose concentration in saliva was also estimated to be 0.91 ± 0.04 mM, which indicated that the CuO NWs/CF owned the possibility for noninvasive glucose detection. The rational design of CuO NWs/CF provided an efficient strategy for fabricating of electrochemical nonenzymatic biosensors. [ABSTRACT FROM AUTHOR]

One-dimensional nanocomposites of metal-oxide and noble metal were expected to present superior performance for nonenzymatic glucose detection due to its good conductivity and high catalytic activity inherited from noble metal and metal oxide respectively. As a proof of concept, we synthesized gold and copper oxide (Au/CuO) composite with unique one-dimensional nanocauliflowers structure. Due to the nature of the synthesis method, no any foreign binder was needed in keeping either Au or CuO in place. To the best of our knowledge, this is the first attempt in combining metal oxide and noble metal in a binder-free style for fabricating nonenzymatic glucose sensor. The Au/CuO nanocauliflowers with large electrochemical active surface and high electrolyte contact area would promise a wide linear range and high sensitive detection of glucose with good stability and reproducibility due to its good electrical conductivity of Au and high electrocatalytic activity of CuO. [ABSTRACT FROM AUTHOR]