Journal ArticleDOI
Highly sensitive SnO2 thin film NO2 gas sensor operating at low temperature
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In this article, the structural and morphological properties of thin nano-crystalline SnO 2 and WO 3 -doped SnO2 films are investigated using XRD, TEM and AFM.Abstract:
Thin films of pure nano-crystalline SnO 2 and WO 3 -doped SnO 2 in different concentrations (3 wt.% and 5 wt.%) are deposited using sol–gel spin coating technique on glass substrates. The structural and morphological properties of these films are investigated using XRD, TEM and AFM. The sensitivity and selectivity of these films are tested to different reducing and oxidizing gases such as SO 2 , NH 3 , NO 2 and ethanol. A SnO 2 thin film with 5 wt.% WO 3 shows very high responses to NO 2 (four orders of magnitude in the value of ( R g − R a )/ R a ; R g and R a are the resistance in NO 2 and in air, respectively) and excellent selectivity for NO 2 gas at a low operating temperature of 150 °C. The effect of WO 3 on the sensing characteristics of these films towards NO 2 is discussed.read more
Citations
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Semiconducting Metal Oxide Based Sensors for Selective Gas Pollutant Detection
TL;DR: A review of some papers published in the last fifty years that focus on the semiconducting metal oxide (SMO) based sensors for the selective and sensitive detection of various environmental pollutants is presented.
Journal ArticleDOI
Tuning gas-sensing properties of reduced graphene oxide using tin oxide nanocrystals
TL;DR: In this paper, a novel and selective gas-sensing platform with reduced graphene oxide (RGO) decorated with tin oxide (SnO2) nanocrystals (NCs) was presented.
Journal ArticleDOI
Highly sensitive thin film NH3 gas sensor operating at room temperature based on SnO2/MWCNTs composite
Abstract: A SnO 2 /MWCNTs composite-based NH 3 sensor working at room temperature was fabricated by thin film microelectronic technique. The gas-sensitive composite thin film was prepared by using both commercially available multi-walled carbon nanotubes (MWCNTs) and nanosized SnO 2 dispersion. Microstructure and surface morphology of the composite were investigated and they revealed that the MWCNTs were still present and well embedded by SnO 2 particles in the composite powder as well as in the composite thin film at calcination temperatures up to 550 °C. The effect of the preparation process of the sensitive composite thin film on gas-sensing properties was examined, and the preparation process parameters such as MWCNTs content, MWCNTs diameter, calcination temperature, and film thickness were optimized. At room temperature, the optimal composite sensor exhibited much higher response and faster response-recovery (less than 5 min) to NH 3 gas of concentrations ranging from 60 to 800 ppm, in comparison with the carbon nanotubes-based NH 3 sensor. Based on the experimental observations, a model of potential barrier to electronic conduction at the grain boundary for the CNTs/SnO 2 composite sensors was also discussed.
Journal ArticleDOI
NO2 sensing performance of SnO2 hollow-sphere sensor
Jun Zhang,Shurong Wang,Yanmei Wang,Yan Wang,Baolin Zhu,Huijuan Xia,Xianzhi Guo,Shoumin Zhang,Weiping Huang,Shihua Wu +9 more
TL;DR: In this article, the authors examined the possibility of using SnO 2 hollow spheres mediated by carbon microspheres for the efficient detection of NO 2 gas, and found that the sensors were more sensitive to NO 2 than to ethanol, methanol, gasoline, acetone, CCl 4 and NH 3 when operated at 160°C.
Journal ArticleDOI
SnO2 thin film sensor with enhanced response for NO2 gas at lower temperatures
TL;DR: In this paper, the effect of growth pressure on the surface morphology and structural property of SnO2 film was studied using Atomic force microscopy (AFM), Scanning electron microscopy and X-ray Diffraction (XRD) respectively.
References
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Journal ArticleDOI
SnO2 sensors: current status and future prospects☆
TL;DR: A survey on the current status and future prospects in research and development of SnO2-based sensors is given in this paper, where the influence of contact geometry and crystallinity on the sensor response signal is outlined.
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Semiconductor gas sensors
TL;DR: In this paper, various ways that gaseous species can affect the resistance of a semiconductor are discussed, with particular emphasis on those where the effect is reversible and, hence, suitable for gas sensing.
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Energy crops: current status and future prospects
TL;DR: In this article, the potential of energy crops to contribute to global energy demand and climate mitigation over the next few decades, and examine the future prospects, is examined, based on a new analysis based on energy crop areas for each of the IPCC SRES scenarios in 2025.
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Nox gas sensing characteristics of wo3 thin films activated by noble metals (pd, pt, au) layers
TL;DR: In this paper, a WO3-based gas sensor has been fabricated by reactive reactive rf sputtering on glass substrates, where Palladium (Pd), platinum (Pt), gold (Au), noble metals (100-600 A), and Al layers (1500 A) were sputtered on top of them as upper electrodes for sensor output.
Journal ArticleDOI
The role of noble metals in the chemistry of solid-state gas sensors
TL;DR: In this article, the role of chemisorbed and lattice oxygen on oxides and noble metals is demonstrated by examples, and the chemical aspects in the detection of hydrogen by three types of palladium-based sensors are compared.