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276 results on '"Luo, Ruixian"'

52. ZnO/BiFeO3 heterojunction interface modulation and rGO modification for detection of triethylamine.

Author

Bai, Shouli, Tian, Ke, Zhao, Yingying, Feng, Yongjun, Luo, Ruixian, Li, Dianqing, and Chen, Aifan

Abstract

A novel 9ZnO/BiFeO3/rGO(1%) composite was designed and synthesized using facile sol–gel, hydrothermal and hydrazine hydrate reduction methods for detection of triethylamine. Various spectra were used to characterize the structures and morphologies of the composite. The sensing tests indicate that the composite exhibits the highest response of 13.4 to 10 ppm TEA at a low temperature of 112 °C, which is 2.2 times higher than that of pure ZnO. Moreover, the composite has excellent selectivity, rapid response, and a good linear response relationship in the low detection range of 0.5–12 ppm along with long-term stability. The improvement in the mechanism was discussed in detail, which is attributed to the synergistic effect of the heterojunction and rGO, and the former forms an additional electron depletion layer at the junction interface to increase resistance in air, while the latter accelerates electron transfer and increases composite surface-active sites to promote gas adsorption and surface reaction. [ABSTRACT FROM AUTHOR]

Published
2022
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53. Association of polymorphisms in with progression and susceptibility in gastric cancer.

Author

Huang, Li, Luo, Ruixian, Yang, Ziji, Xu, Juanjuan, Li, Hailan, and Mo, Zhuning

Abstract

Background: High expression of PIN1 is associated with gastric cancer progression and risk. Patients & methods: Two single-nucleotide polymorphisms in PIN1, rs2233678 and rs2233679, were examined in gastric cancer patients using PCR-restriction fragment length polymorphism. Results: The rs2233678 GC genotype and C alleles correlated with a decreased susceptibility to gastric cancer. The stratification analysis indicated that the rs2233678 GC genotype was inversely related to gastric cancer risk in never smokers, never drinkers and patients with stage I/II disease. Males and ever drinkers carrying the rs2233679 CT genotype had a mildly elevated susceptibility to gastric cancer. Conclusion: The PIN1 single-nucelotide polymorphisms rs2233678 and rs2233679 correlate with the risk of gastric cancer. [ABSTRACT FROM AUTHOR]

Published
2022
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66. A novel composite of α-MoO3/BiVO4 for triethylamine selective detection.

Author

Bai, Shouli, Han, Jingyi, Fan, Xiangxiang, Guo, Jian, Luo, Ruixian, Li, Dianqing, and Chen, Aifan

Subjects
AIR resistance, MOLYBDATES, COMPOSITE structures, ORGANIC conductors, ETHYLAMINES, HETEROJUNCTIONS, ORDER picking systems
Abstract

One-dimensional α-MoO3 nanorods were synthesized by a hydrothermal method and BiVO4 nanoparticles were grown directly onto the α-MoO3 nanorods using a simple metal organic decomposition process in order to construct an α-MoO3/BiVO4 composite with a heterojunction, for the fabrication of a rapid response triethylamine (TEA) sensor. The morphology and structure of the composite were characterized via various spectral techniques and the sensing properties of the sensor for TEA were investigated via resistance measurements. The results showed that the response of the 16Mo/Bi composite to 20 ppm TEA was 1.86 times and 15 times higher than those of α-MoO3 and BiVO4, respectively, at an optimum operating temperature of 125 °C. The enhancement can be ascribed to the existence of a heterojunction between α-MoO3 and BiVO4, creating an additional barrier at the interface of the heterojunction, and this increases the resistance of the composite in air and decreases the resistance in TEA, thus enhancing the response of the composite to TEA. [ABSTRACT FROM AUTHOR]

Published
2020
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75. Synthesis of quantum size ZnO crystals and their gas sensing properties for NO2

Author

Hu Jingwei, Li Dianqing, Chen Aifan, Chen Liangyuan, Bai Shouli, Luo Ruixian, and Chung Chiun Liu

Subjects
Materials science, Photoluminescence, Metals and Alloys, Crystal structure, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, symbols.namesake, Crystallography, Chemical engineering, Transmission electron microscopy, law, Materials Chemistry, symbols, Calcination, Crystallite, Particle size, Electrical and Electronic Engineering, Raman spectroscopy, Instrumentation, Wurtzite crystal structure
Abstract

Quantum size ZnO crystals have been synthesized successfully by a room temperature sol–gel process. Oleic acid (OA) has been used as capping agent to control the particle size of ZnO. The crystal structure and size of the ZnO are characterized by the X-ray diffraction (XRD) and transmission electron microscope (TEM). The XRD results show the as-synthesized ZnO has hexagonal wurtzite structure and the average crystallite size is 5.7 nm which is little less than TEM result. It is testified by photoluminescence (PL) and Raman spectra that the quantum size ZnO keeps the crystal structure of the bulk ZnO and possesses more surface defects. The quantum size ZnO has the highest response of 280 to NO 2 and the highest selectivity of 31 and 49 corresponding to CO and CH 4 at operating temperature of 290 °C. The effect of calcination temperatures on sensing property and transient response of the ZnO sensor are also investigated.

Published
2011

76. Sn/In/Ti nanocomposite sensor for CH4 detection

Author

Luo Ruixian, Chen Aifan, Yang Pengcheng, Chen Liangyuan, Bai Shouli, and Chung Chiun Liu

Subjects
Materials science, Nanocomposite, Precipitation (chemistry), Metals and Alloys, Analytical chemistry, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, Grain growth, Crystallinity, X-ray photoelectron spectroscopy, Chemical engineering, law, Desorption, Materials Chemistry, Calcination, Thermal stability, Electrical and Electronic Engineering, Instrumentation
Abstract

Novel CH4 gas sensors made of the nanocomposites of Sn/In/Ti oxides were investigated. The nanosized crystalline oxides and their composites were successfully prepared by a sol–gel and controlled precipitation method, respectively, through manipulating the salts concentration, precipitation pH value, aging time and composition of composites. The derived precursors exhibited superior thermal stability. To ensure sufficient crystallinity and insignificant grain growth of the materials, the appropriate calcination temperatures were 600 °C for 4 h and 700 °C for 2 h for the precursors of oxides and composites, respectively. The performance and structure of the composites were characterized by EDX, TEM, BET, TG–DTA and XRD. The sensing tests showed that these nanocomposites exhibited high response and selectivity for the detection of CH4 at operating temperatures between 200 °C and 250 °C and the response depended on the composition of composites, calcination temperature, operating temperature and gas concentration in air. The gas sensing mechanism of the sensors was also discussed by X-ray photoelectron spectroscopic (XPS) and temperature-programmed desorption (TPD) studies.

Published
2008

79. An integrating photoanode consisting of BiVO4, rGO and LDH for photoelectrochemical water splitting.

Author

Sun, Lixia, Sun, Jianhua, Yang, Xiaojun, Bai, Shouli, Feng, Yongjun, Luo, Ruixian, Li, Dianqing, and Chen, Aifan

Subjects
PHOTOELECTROCHEMICAL cells, P-N heterojunctions, CHARGE carrier mobility, WATER efficiency, GRAPHENE oxide, CHARGE transfer
Abstract

The low carrier mobility of BiVO4 is a bottleneck that limits its charge transfer in bulk or on the surface. Herein, reduced graphene oxide (rGO) nanosheets as an effective electron mediator were successfully loaded on BiVO4 and NiFe-layered double hydroxides (NiFe-LDHs) were decorated on BiVO4/rGO heterojunctions by two facile electrodeposition methods to construct a triadic photoanode of BiVO4/rGO/NiFe-LDH for improvement of photoelectrochemical (PEC) water splitting efficiency of BiVO4. This photoanode significantly extends the absorption region of visible light, increases the photocurrent density, exhibits an onset potential with a significant cathodic shift, and enhances photon-to-electron conversion efficiency (IPCE) compared with the pristine BiVO4 photoanode. The enhancement of PEC properties benefits from the formation of p–n heterojunctions between rGO and BiVO4 and the use of NiFe-LDH as a cocatalyst for accelerating the kinetics of oxygen evolution from water. [ABSTRACT FROM AUTHOR]

Published
2019
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80. Facile synthesis of Pd-doped ZnSnO3 hierarchical microspheres for enhancing sensing properties of formaldehyde.

Author

Bai, Shouli, Tong, Weiguang, Tian, Ye, Fu, Hang, Zhao, Yanhong, Shu, Xin, Luo, Ruixian, Li, Dianqing, and Chen, Aifan

Subjects
COLD fusion, FORMALDEHYDE, NANOPARTICLES, PRECIPITATION (Chemistry), CHEMICAL reactions
Abstract

The precursors (ZnSn(OH)6) of ZnSnO3 hierarchical microspheres have been synthesized by an facile chemical precipitation method at room temperature followed by self-assembly, and then, the precursors were converted into hierarchical ZnSnO3 microspheres composed of nanoparticles by annealing. The structure and morphologies of the products were characterized by a series of analysis methods. The sensing performance of the ZnSnO3 microspheres to formaldehyde was studied, and the sensing mechanism was also discussed in detail. The sensing tests indicate that doping Pd can significantly improve the sensing properties of ZnSnO3 to formaldehyde, especially when the doping proportion of Pd is 4 wt%. In addition, the material has low detection limit of 100 ppb and shows linear response to formaldehyde in the concentration range from 0.1 to 10 ppm at operating temperature of 103 °C. All the above properties indicate that the 4 wt% Pd-doped composite is an attractive sensing material for detection of formaldehyde. [ABSTRACT FROM AUTHOR]

Published
2019
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81. Catalytic combustion properties of nanocomplex oxide for natural gas*

Author

Yang Dong, Chen Aifan, Li Yingxia, Ma Lijing, Bai Shouli, and Luo Ruixian

Subjects
Copper oxide, Coprecipitation, Inorganic chemistry, Oxide, chemistry.chemical_element, Catalytic combustion, Copper, Catalysis, law.invention, Cerium, chemistry.chemical_compound, chemistry, law, General Materials Science, Calcination
Abstract

The catalysts of copper oxide supported on cerium dioxide were prepared by different methods for methane catalytic combustion. The effects of copper content in the catalysts and calcination temperatures of the catalysts on the catalytic activity are investigated. Results show that the complex oxide catalyst exhibits high catalytic activity for methane combustion due to the synergistic effect of CuO and CeO2. The catalyst prepared by impregnation is more active than that prepared by controlled coprecipitation even if CuO content is the same. When W (CuO)

Published
2005

94. Two-step electrodeposition to fabricate the p–n heterojunction of a Cu2O/BiVO4 photoanode for the enhancement of photoelectrochemical water splitting.

Author

Bai, Shouli, Liu, Jingchao, Cui, Meng, Luo, Ruixian, He, Jing, and Chen, Aifan

Subjects
X-ray diffraction, WATER electrolysis, CHEMICAL reactions
Abstract

A Cu2O/BiVO4 p–n heterojunction based photoanode in photoelectrochemical (PEC) water splitting is fabricated by a two-step electrodeposition method on an FTO substrate followed by annealing treatment. The structures and properties of the samples are characterized by XRD, FESEM, HRTEM, XPS and UV-visible spectra. The photoelectrochemical activity of the photoanode in water oxidation has been investigated and measured in a three electrode quartz cell system; the obtained maximum photocurrent density of 1.72 mA cm−2 at 1.23 V vs. RHE is 4.5 times higher than that of pristine BiVO4 thin films (∼0.38 mA cm−2). The heterojunction based photoanode also exhibits a tremendous cathodic shift of the onset potential (∼420 mV) and enhancement in the IPCE value by more than 4-fold. The enhanced photoelectrochemical properties of the Cu2O/BiVO4 photoelectrode are attributed to the efficient separation of the photoexcited electron–hole pairs caused by the inner electronic field (IEF) of the p–n heterojunction. [ABSTRACT FROM AUTHOR]

Published
2018
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