scholarly journals Mesoporous In2O3: Effect of Material Structure on the Gas Sensing

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Z. X. Cheng ◽  
X. H. Ren ◽  
J. Q. Xu ◽  
Q. Y. Pan
Keyword(s):  
Gas Sensor ◽  
Gas Adsorption ◽  
Gas Sensing ◽  
Sol Gel ◽  
Soft Template ◽  
Material Surface ◽  
Material Structure ◽  
Semiconductor Gas Sensor ◽  
Response Recovery ◽  
Sol Gel Process

We present a semiconductor gas sensor based on mesoporous In2O3(m-In2O3). The m-In2O3was successfully fabricated by a simple sol-gel process, using block copolymer PE6800 as a soft template. The results of gas sensing reveal that the m-In2O3prepared at room temperature shows higher resistance, which plays the key role in its greater sensitivity. The pore structure of material has an influence on gas adsorption on the material surface, which further affects response-recovery time of gas sensor.

VOC Gas Sensor Based on ZnO Synthesized by Sol–Gel Process and Improvement in Gas Sensitivity by Adding TiO2

2013 ◽  
Vol 310 ◽  
pp. 67-70
Author(s):  
Lin Ren ◽  
Xing Long Qi ◽  
Xue Hao ◽  
Guang Dong Liang
Keyword(s):  
Gas Sensor ◽  
Sol Gel ◽  
Fine Powder ◽  
Optimum Operating ◽  
Gas Sensitivity ◽  
Weight Percentage ◽  
Response Recovery ◽  
Sol Gel Process ◽  
Zno Powder ◽  
Optimum Working

Transparent ZnO gel was synthesized by sol-gel process. In order to getting fine powder of ZnO, at the beginning, ZnO gel was disposed with the pre-firing at 300°C. And then, ZnO powder was calcined at different temperature of 500 °C, 700 °C and 900 °C, the grain size of ZnO powder was different. This paper reports the sensitivity of ZnO gas sensor to three volatile organic compound (VOC) gases (acetone, ethanol and toluene). As we all know, these VOC gases are deleterious to global environment and our health. For different VOC gases, the optimum operating currents and the corresponding sensitivities were different. This paper also researched a nicely sensitive indirect- heating type thick film ZnO gas sensor by adding TiO2. TiO2 was mixed in weight percentage of 2%. The compound oxide sensor debased the optimum working currents of ethanol and toluene. And this sensor also showed rapid response-recovery time, which was propitious to practicability of ZnO gas sensor.

scholarly journals Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2103 ◽  
Author(s):  
Tae-Hee Han ◽  
So-Young Bak ◽  
Sangwoo Kim ◽  
Se Hyeong Lee ◽  
Ye-Ji Han ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Sol Gel ◽  
Oxide Semiconductor ◽  
Zno Nps ◽  
X Ray ◽  
Semiconductor Gas Sensor ◽  
Initial Resistance ◽  
P Type ◽  
Sensing Characteristics

This paper introduces a method for improving the sensitivity to NO2 gas of a p-type metal oxide semiconductor gas sensor. The gas sensor was fabricated using CuO nanowires (NWs) grown through thermal oxidation and decorated with ZnO nanoparticles (NPs) using a sol-gel method. The CuO gas sensor with a ZnO heterojunction exhibited better sensitivity to NO2 gas than the pristine CuO gas sensor. The heterojunction in CuO/ZnO gas sensors caused a decrease in the width of the hole accumulation layer (HAL) and an increase in the initial resistance. The possibility to influence the width of the HAL helped improve the NO2 sensing characteristics of the gas sensor. The growth morphology, atomic composition, and crystal structure of the gas sensors were analyzed using field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy, and X-ray diffraction, respectively.

Indium oxide octahedrons based on sol–gel process enhance room temperature gas sensing performance

2015 ◽  
Vol 637 ◽  
pp. 55-61 ◽  
Author(s):  
Xiaohui Mu ◽  
Changlong Chen ◽  
Liuyuan Han ◽  
Baiqi Shao ◽  
Yuling Wei ◽  
...  
Keyword(s):  
Indium Oxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Sensing Performance

Facile lotus-leaf-templated synthesis and enhanced xylene gas sensing properties of Ag-LaFeO3 nanoparticles

2018 ◽  
Vol 6 (23) ◽  
pp. 6138-6145 ◽  
Author(s):  
Mingpeng Chen ◽  
Yumin Zhang ◽  
Jin Zhang ◽  
Kejin Li ◽  
Tianping Lv ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Gas Sensing ◽  
Sol Gel ◽  
Templated Synthesis ◽  
Lotus Leaf ◽  
Highly Sensitive ◽  
Lafeo3 Nanoparticles ◽  
Sol Gel Process ◽  
Gas Sensing Properties ◽  
Volatile Organic

For developing highly sensitive, selective and stable gas sensing materials for the detection of volatile organic compounds, we report porous micro/nano-level structured Ag-LaFeO3 nanoparticles which have been successfully synthesized using a lotus leaf as a bio-template via a sol–gel process.

scholarly journals Sensitivity Improvement of Urchin-Like ZnO Nanostructures Using Two-Dimensional Electron Gas in MgZnO/ZnO

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5195
Author(s):  
So-Young Bak ◽  
Jeongseok Lee ◽  
Yoojong Kim ◽  
Se-Hyeong Lee ◽  
Kyoungwan Woo ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Sol Gel ◽  
Electron Gas ◽  
Two Dimensional ◽  
Zno Nanostructures ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
X Ray ◽  
Sol Gel Process ◽  
Dimensional Electron Gas

This paper introduces a strategy for improving the sensitivity of a gas sensor to NO2 gas. The gas sensor was fabricated using urchin-like ZnO nanostructures grown on MgO particles via vapor-phase growth and decorated with MgZnO nanoparticles via a sol-gel process. The urchin-like ZnO gas sensor decorated with MgZnO showed higher sensitivity to NO2 gas than a pristine urchin-like ZnO gas sensor. When ZnO and MgZnO form a heterojunction, a two-dimensional electron gas is generated. This improves the performance of the fabricated gas sensor. The growth morphology, atomic composition, and phase structure were confirmed through field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction, respectively.

Sensing Properties of CNT hybrid MOS-based Sensors

2004 ◽  
Vol 828 ◽  
Author(s):  
Wei-Jen Liou ◽  
Tsung-Yeh Yang ◽  
Kuang-Nan Lin ◽  
Ching-Hong Yang ◽  
Hong-Ming Lin
Keyword(s):  
Electron Microscopy ◽  
Gas Adsorption ◽  
Gas Sensing ◽  
Sol Gel ◽  
Gas Sensitivity ◽  
Sensing Properties ◽  
Operation Temperature ◽  
Transmission Electron ◽  
Lower Temperature ◽  
P Type

ABSTRACTThe carbon nanotubes provide large surface that can enhance the gas adsorption properties and increase the conductivity at a lower temperature for gas sensing. The gas sensing properties of the hybrid TiO2/CNTs material are examined in this study. The sol-gel technique is used to prepare a thin layer of nano-TiO2 coated on CNTs. The structure of TiO2/CNTs hybrid materials is identified by X-ray diffraction (XRD) and Raman spectrum. The granules and surface morphology are analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrical properties of the hybrid TiO2/CNTs indicate that the operation temperature can be lowered to ambient temperature and this will enhance the gas sensitivity for detecting CO gas. The n-type or p-type behavior of hybrid TiO2/CNTs can be controlled by the coating thickness of hybrid TiO2. According to the image results, the mechanisms of the n-type and p-type behavior of hybrid TiO2/CNTs system are proposed.

scholarly journals Cu-Doped ZnO Thin Films Deposited by a Sol-Gel Process Using Two Copper Precursors: Gas-Sensing Performance in a Propane Atmosphere

Materials ◽  
2016 ◽  
Vol 9 (2) ◽  
pp. 87 ◽  
Author(s):  
Heberto Gómez-Pozos ◽  
Emma Arredondo ◽  
Arturo Maldonado Álvarez ◽  
Rajesh Biswal ◽  
Yuriy Kudriavtsev ◽  
...  
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Sol Gel Process ◽  
Doped Zno ◽  
Sensing Performance
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