Effects of reduced graphene oxide loading on gas-sensing characteristics of flame-made Bi2WO6 nanoparticles

被引：39

作者：

Bunpang, Ketkaeo ^{[1
,2
]}

Wisitsoraat, Anurat ^{[3
,4
]}

Tuantranont, Adisorn ^{[3
,4
]}

Phanichphant, Sukon ^{[3
]}

Liewhiran, Chaikarn ^{[1
,3
,5
]}

机构：

[1] Chiang Mai Univ, Fac Sci, Dept Phys & Mat Sci, Chiang Mai 50200, Thailand

[2] Chiang Mai Univ, Grad Sch, Chiang Mai 50200, Thailand

[3] Chiang Mai Univ, Fac Sci, Ctr Adv Mat Printed Elect & Sensors, Mat Sci Res Ctr, Chiang Mai 50200, Thailand

[4] Natl Sci & Technol Dev Agcy, Graphene & Printed Elect Res Div, Natl Sci & Dual Use Technol Ctr, Klongluang 12120, Phathum Thani, Thailand

[5] Chiang Mai Univ, Ctr Excellence Mat Sci & Technol, Chiang Mai 50200, Thailand

来源：

APPLIED SURFACE SCIENCE | 2019年 / 496卷

关键词：

Flame spray pyrolysis; Bi2WO6; nanoparticles; Reduced graphene oxide; H2S sensor; NITROGEN-DOPED GRAPHENE; PHOTOCATALYTIC ACTIVITY; HYDROTHERMAL SYNTHESIS; THERMAL REDUCTION; FACILE SYNTHESIS; THICK-FILMS; H2S; SENSORS; TEMPERATURE; COMPOSITE;

D O I：

10.1016/j.apsusc.2019.143613

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, the effects of reduced graphene oxide (rGO) loading on the gas-sensing characteristics of flame-made Bi2WO6 nanoparticles were systematically investigated. Bi2WO6 nanoparticles produced by flame spray pyrolysis (FSP) were loaded with rGO prepared based on Hummer's method with varying concentrations from 0 to 5 wt%. Characterized results by X-Ray diffraction, scanning and transmission electron microscopy, energy dispersive spectroscopy, Raman spectroscopy, X-ray photoemission spectroscopy and nitrogen adsorption confirmed the dispersion of rGO sheets within 5-15 nm FSP-made orthorhombic Bi2WO6 nanoparticles. The gas-sensing data measured in dry air demonstrated that the optimal rGO loading level of 2 wt% provided substantial enhancements of H2S response and selectivity. Specifically, the 2 wt% rGO-loaded Bi2WO6 sensor exhibited the highest response of similar to 29 towards 10 ppm H2S with high selectivity against H-2, CH4, NO, NO2, C7H8, CH2O, C8H10, C6H6, C3H6O, CH3OH, C2H5OH, C3H6O2, C3H6O3, C4H8O2, CH3COOH, C4H9COOH and HCOOH at an optimal working temperature of 350 degrees C. The roles of rGO on gas-sensing behaviors were explained on the basis of p-n heterojunctions between rGO and Bi2WO6. Therefore, the rGO-loaded Bi2WO6 sensor is an attractive candidate for H2S detection.

引用

页数：11

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