Journal ArticleDOI
Near Room Temperature Sensing by In₂O₃ Decorated Silicon Nanowires for Sensitive Detection of Ethanol
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TLDR
In this paper, the role of indium trioxide (In2O3) decorated Si nanowires (SiNWs) based resistive sensor for selective detection of ethanol vapors at near room temperature has been successfully demonstrated.Abstract:
The role of indium trioxide (In2O3) decorated Si nanowires (SiNWs) based resistive sensor for selective detection of ethanol vapors at near room temperature has been successfully demonstrated. SiNWs samples were synthesized using metal assisted chemical etching technique and these were decorated by a thin film of indium followed by annealing. The sensing response was captured by measuring the change in resistance of the sensing layer using a Cr-Au inter-digitated-electrode (IDE) structure formed on top of the sensing layers. All sensors were tested for ethanol, acetone, iso-propanol (IPA), xylene, benzene and toluene vapours in the wide concentration range of 5–500 ppm and at different temperatures. Sensors based on SiNWs alone had displayed higher response towards acetone vapours whereas after heterojunction formation with In2O3, significant sensitivity to ethanol was depicted. In2O3 decorated SiNWs resulted in significant enhancement of the sensor response% towards ethanol at near room temperature. Minimum detection of ethanol at 50 ppm and 10 ppm was portrayed by SiNWs and In2O3/SiNWs based sensors respectively. It was concluded that sensing behaviour was a consequence of combinatory effect produced by the presence of both SiNWs and In2O3. A simple explanation with device schematic and band diagrams of the material are proposed to describe the sensing mechanism. This study demonstrates the significance of surface treatment of SiNWs and the role of heterostructures for tuning the sensing properties and development of wafer scalable sensors.read more
Citations
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MoS2/SiNWs heterostructure based repeatable and highly responsive photodetector
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References
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Journal ArticleDOI
Semiconductor MoO3–TiO2 thin film gas sensors
Kosmas Galatsis,Yongxiang Li,W. Wlodarski,Elisabetta Comini,Guido Faglia,Giorgio Sberveglieri +5 more
TL;DR: In this paper, the O 2, CO and NO 2 gas sensing properties of MoO 3 -TiO 2 thin films have been studied and it was found that the MoO dominated sensors have a lower optimal operating temperature of 370°C than the TiO 2 dominated sensors.
Journal ArticleDOI
In2O3 Nanotowers: Controlled Synthesis and Mechanism Analysis
TL;DR: Two kinds of novel In2O3 nanotowers were synthesized in an improved chemical vapor deposition (CVD) system through controlling the kinetics factors (saturation ratio) as mentioned in this paper.
Journal ArticleDOI
Phase-Controlled Synthesis of Colloidal In2O3 Nanocrystals via Size-Structure Correlation
TL;DR: In this article, a direct correlation between the nanocrystal size and structure was demonstrated, and it was shown that metastable corundum-type In2O3 is a transient structure in the formation of bixbyite-type nanocrystals.
Journal ArticleDOI
Construction of 1D SnO 2 -coated ZnO nanowire heterojunction for their improved n-butylamine sensing performances
Liwei Wang,Jintao Li,Yinghui Wang,Kefu Yu,Tang Xingying,Yuanyuan Zhang,Shaopeng Wang,Chaoshuai Wei +7 more
TL;DR: After modification, SnO2/ZnO NW based sensor exhibited remarkably improved response, fast response and recovery speeds, good selectivity and excellent reproducibility to n-butylamine gas, indicating it can be used as promising candidates for high-performance organic amine sensors.
Journal ArticleDOI
Room temperature ethanol sensing properties of ZnO nanorods prepared using an electrospinning technique
TL;DR: In this paper, a simple electrospinning route has been proposed to control the growth of ZnO nanorods with definite planes for achieving an enhanced room temperature response to ethanol vapor.
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