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Effect of Gas Sensing Properties by Sn-Rh Codoped ZnO Nanosheets
Ziwei Chen,Zhidong Lin,Mengying Xu,Yuyuan Hong,Na Li,Ping Fu,Ze Chen 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.3
The hierarchically porous Sn-Rh codoped ZnO, Sn-doped ZnO and pureZnO nanosheets have been successfully synthesized through a simplehydrothermal reaction process without any surfactant or template at 180°C. The morphology and composition were carefully characterized by X-raydiffraction, energy dispersive X-ray spectrometer, field emission scanningelectronic microscopy and BET. The gas-sensing testing results indicatedthat the Sn-Rh codoped ZnO nanosheets, with the specific surface area was26.9 m2/g, exhibited enhanced gas-sensing performance compared withthat of pure ZnO and Sn-doped ZnO. The high sensitivity of the sensorbased on Sn-Rh codoped ZnO was 149.38 to 100 ppm ethanol and thedetection limit was less than 5 ppm (5.8). The response and recovery timeswere measured to be ~3 s and ~10 s when exposed to 100 ppm ethanol atthe test temperature of 300°C. The good sensing performance of the Sn-Rhcodoped ZnO sensor indicated that hierarchically porous Sn-Rh codopedZnO could be a promising candidate for highly sensitive gas sensors.
Enhanced Formaldehyde Gas Sensing Properties of ZnO Nanosheets Modified with Graphene
Ziwei Chen,Yuyuan Hong,Zhidong Lin,Li-Ming Liu,Xiao-Wen Zhang 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
In this study, pure ZnO (ZnO-1, ZnO-2) with two different morphologies, andgraphene doped ZnO-2 (G-ZnO-2) were synthesized using a simplehydrothermal process at 150 °C. The formaldehyde gas sensing performanceof the G-ZnO-2 composite, synthesized by an in-situ method was investigated. The morphologies and the structures of the nanomaterials were characterizedby X-ray diffraction, field emission scanning electronic microscopy, andtransmission electron microscopy. The experimental results indicate that the GZnO-2 based sensor exhibits unique advantages for the sensing offormaldehyde gas at concentrations in the range of 2 to 2000 ppm, such as fastresponse/recovery time and good selectivity, at an optimal workingtemperature of 200 °C. The improved sensing performance of the G-ZnO-2composite indicates that the addition of graphene is effective in improving theformaldehyde sensing performance of ZnO-based sensors.
Jinhua Zhang,Huiyue Qian,Wencheng Liu,Hao Chen,Yang Qu,Zhidong Lin 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6
A heterostructural composite composed of g-C3N4 and Bi2O3 was achieved by the one-pot and thermal-induced polycondensation method using melamine and Bi(NO3)3 as precursor at 550 ℃ under air atmosphere. The crystalline phase, components and morphologies of the as-prepared composites were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Besides, the photocatalytic activity of composites was evaluated by degrading RhB aqueous solution at room temperature under visible light irradiation. Compared with bulk g-C3N4, the photocatalytic efficiency of the 0.5% Bi2O3/g-C3N4 (Bi–CN) was increased by up to four times. The introduction of Bi2O3 enhances not only the light absorption ability, but also the separation of photogenerated electron–hole pairs.