Optimization ethanol detection performance manifested by gas sensor based on In^sub 2^O^sub 3^/ZnS rough microspheres

For traditional resistance-type gas sensor, introducing heterostructures was an effective way to enhance the sensing performance. In this work, heterostructure In2O3/ZnS composites material with rough spherical morphology was synthesized by two-step hydrothermal process in which pure ZnS microsphere...

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Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. 264; p. 263
Main Authors Chen, Q, Ma, SY, Xu, XL, Jiao, HY, Zhang, GH, Liu, LW, Wang, PY, Gengzang, DJ, Yao, HH
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier Science Ltd 01.07.2018
Subjects
Composite materials
Ethanol
Gas detectors
Gas sensors
Heterojunctions
Heterostructures
Indium
Indium oxides
Microspheres
Morphology
Operating temperature
Recovery time
Scanning electron microscopy
Scanning microscopy
Substrates
Synergistic effect
Transmission electron microscopy
X ray photoelectron spectroscopy
X-ray diffraction
Zinc sulfide
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Summary:For traditional resistance-type gas sensor, introducing heterostructures was an effective way to enhance the sensing performance. In this work, heterostructure In2O3/ZnS composites material with rough spherical morphology was synthesized by two-step hydrothermal process in which pure ZnS microspheres acted as substrate for the coating of In2O3 nanoparticles. The obtained products were characterized by X-ray diffraction (XRD), field-emission electron scanning microscopy (FESEM), transmission electron microscopy (TEM), elemental mapping, X-ray photoelectron spectroscopy (XPS) and Brunauere-Emmette-Teller (BET) analysis. When compared with the sensors based on pure ZnS microspheres and pure In2O3 nanocubes, the In2O3/ZnS heterostructures sensor had an excellent sensing performance to ethanol, and the response to 100 ppm ethanol was 11.7 which was nearly 2 times higher than that of pristine ZnS sensor (about 5.87) and 1.6 times larger than that of pristine In2O3 sensor (about 7.309) at the optimal operating temperature of 260 °C. The response/recovery time of In2O3/ZnS sensor were 21/34 s, whereas the pure samples were 32/59 s (ZnS) and 35/38 s (In2O3) respectively. The main mechanism for the enhanced performance of In2O3/ZnS composites sensor were the formation of heterojunction and synergistic effect between In2O3 shell and ZnS core, meanwhile, the large specific surface area was also a contribution factor.
ISSN:0925-4005
1873-3077