DIP Coated Thick Films of SnO2 and it’s Ethanol Sensing Properties

2011 ◽  
Vol 110-116 ◽  
pp. 1270-1277
Author(s):  
B. Bharath ◽  
G. Pradeep Reddy
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
Morphological Characteristics ◽  
X Ray Diffraction ◽  
Sensing Properties ◽  
Force Microscopy ◽  
Atomic Force ◽  
Gas Sensing Properties ◽  
Metal Oxide Gas Sensors ◽  
Ethanol Sensing

SnO2 powder was prepared by soft chemical method. The Structure and Morphological characteristics of SnO2powder was analyzed by X-Ray Diffraction (XRD), Atomic Force Microscopy (AFM), UV, FTIR and Scanning Electron Microscopy (SEM) techniques. Its gas sensing properties are analyzed towards toxic gas at ppm level. Sensitivity of a SnO2oxide based sensor towards an analyte gas can be enhanced by using the metals in different geometries viz, thick film. The gas sensing properties were studied towards reducing gas like ethanol and it is observed that SnO2shows high response to ethanol at relatively lower operating temperature. The SnO2nanomaterial shows better sensitivity towards ethanol at an operating temperature 2500C. Ethanol vapour has been one of the most extensively studied gases for metal oxide gas sensors.

Low-Temperature Synthesis and Gas Sensing Properties of Anatase TiO2 Thin Films

2011 ◽  
Vol 492 ◽  
pp. 300-303
Author(s):  
Fu Jian Ren ◽  
Yi Sun ◽  
Liang Huang ◽  
Yun Han Ling ◽  
Jia You Feng
Keyword(s):  
Thin Films ◽  
Deposition Temperature ◽  
Gas Sensing ◽  
X Ray Diffraction ◽  
Sensing Properties ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force ◽  
Gas Sensing Properties ◽  
Gas Response

Crystalline anatase TiO2thin films were obtained on glass substrates at 60°C, 75°C and 90°C, respectively, by liquid phase deposition (LPD) method without subsequent heat treatment. X-ray diffraction (XRD), atomic force microscopy (AFM) and UV-Vis spectrophotometer were used to characterize the as-synthesized TiO2thin films. The H2sensing properties of the TiO2thin films based sensors were investigated. The results show that the gas sensors signal Ra/Rg (Ra: resistance in air, Rg: resistance in a sample gas) decreases with the increasing deposition temperature. The TiO2thin films obtained at deposition temperature of 60°C exhibited the maximum H2gas response at 350°C, and the magnitude of the sensor signal and the response time for 500ppm H2was 1.25 and 17s, respectively.

Oxygen vacancies-contained SnO2 nanotubes with enhanced ethanol gas sensing properties

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040003 ◽  
Author(s):  
Yifan Chen ◽  
Xiuling Ma ◽  
Chen Li ◽  
Qiuyu Wu ◽  
Yongbo Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Oxygen Vacancies ◽  
Gas Sensing ◽  
Original Sample ◽  
X Ray Diffraction ◽  
Sensing Properties ◽  
Transmission Electron ◽  
Gas Sensing Properties ◽  
Ethanol Sensing

[Formula: see text] porous nanotubes containing oxygen vacancies were prepared by electron spinning and H plasma treatment. The morphology and crystal structure of the samples were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The ethanol-sensing properties of the [Formula: see text] sensor were tested. The results show that the samples treated with H plasma for 20 min have the best performance. Its working temperature is [Formula: see text]C lower than [Formula: see text]C of the original sample, with a sensitivity of 17 at 100 ppm, which is seven times higher than the original sample. It also shows good selectivity to some common interfering gases. This enhancement can be ascribed to the introduced oxygen vacancy. This work provides an efficient way to design high-performance gas sensor materials.

Synthesis and Characterization of Semiconductor Composites Gas Sensors Based on ZnO Doped TiO2 Thin Films by Laser-Induced Plasma

2021 ◽  
Vol 900 ◽  
pp. 112-120
Author(s):  
Souad G. Khalil ◽  
Mahdi M. Mutter
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Electrical Characterization ◽  
X Ray Diffraction ◽  
Type Conductivity ◽  
Force Microscopy ◽  
Atomic Force ◽  
P Type

This work presents the development of n-type (TiO2) and p-type (ZnO) gas-sensitive materials from ZnO doped TiO2 thin films prepared by pulsed laser deposition technique (PLD) on a glass substrate as a gas sensor of CO2 gas. TiO2 gas-sensing layers have been deposited over a range of ZnO content (0, 20, and 40) wt %. The obtained thin films analysis by atomic force microscopy (AFM), and X-ray diffraction (XRD). Electrical characterization shows that TiO2:ZnO thin films were p-type conductivity and ZnO added was unable to change the composition to the n-type conductivity. There are notable gas-sensing response differences between n-type and p-type ZnO doped TiO2 thin film. The responses toward all tested oxidizing gases tend to increase with operating temperature for the n-type TiO2 films. Besides, the p-type ZnO doping results in a significant response improvement toward tested oxidizing gases such as CO2 gas at the low operating temperature of 60 °C.

Polyaniline/SnO2 Nanocomposite Sensor for NO2 Gas Sensing at Low Operating Temperature

2015 ◽  
Vol 14 (04) ◽  
pp. 1550011 ◽  
Author(s):  
A. Sharma ◽  
M. Tomar ◽  
V. Gupta ◽  
A. Badola ◽  
N. Goswami
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Sensing Properties ◽  
Response Recovery ◽  
Transmission Electron ◽  
Gas Sensing Properties

In this paper gas sensing properties of 0.5–3% polyaniline (PAni) doped SnO 2 thin films sensors prepared by chemical route have been studied towards the trace level detection of NO 2 gas. The structural, optical and surface morphological properties of the PAni doped SnO 2 thin films were investigated by performing X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Raman spectroscopy measurements. A good correlation has been identified between the microstructural and gas sensing properties of these prepared sensors. Out of these films, 1% PAni doped SnO 2 sensor showed high sensitivity towards NO 2 gas along with a sensitivity of 3.01 × 102 at 40°C for 10 ppm of gas. On exposure to NO 2 gas, resistance of all sensors increased to a large extent, even greater than three orders of magnitude. These changes in resistance upon removal of NO 2 gas are found to be reversible in nature and the prepared composite film sensors showed good sensitivity with relatively faster response/recovery speeds.

scholarly journals Chemically synthesized PbS Nano particulate thin films for a rapid NO2 gas sensor

2016 ◽  
Vol 34 (1) ◽  
pp. 204-211 ◽  
Author(s):  
Vishal V. Burungale ◽  
Rupesh S. Devan ◽  
Sachin A. Pawar ◽  
Namdev S. Harale ◽  
Vithoba L. Patil ◽  
...  
Keyword(s):  
Thin Films ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Gas Sensitivity ◽  
Silar Method ◽  
Layer Adsorption ◽  
Gas Sensing Properties

AbstractRapid NO2 gas sensor has been developed based on PbS nanoparticulate thin films synthesized by Successive Ionic Layer Adsorption and Reaction (SILAR) method at different precursor concentrations. The structural and morphological properties were investigated by means of X-ray diffraction and field emission scanning electron microscope. NO2 gas sensing properties of PbS thin films deposited at different concentrations were tested. PbS film with 0.25 M precursor concentration showed the highest sensitivity. In order to optimize the operating temperature, the sensitivity of the sensor to 50 ppm NO2 gas was measured at different operating temperatures, from 50 to 200 °C. The gas sensitivity increased with an increase in operating temperature and achieved the maximum value at 150 °C, followed by a decrease in sensitivity with further increase of the operating temperature. The sensitivity was about 35 % for 50 ppm NO2 at 150 °C with rapid response time of 6 s. T90 and T10 recovery time was 97 s at this gas concentration.

Excellent Gas Sensing of CdS Nanowires Decorated with Ag Nanoparticles

2019 ◽  
Vol 19 (11) ◽  
pp. 7083-7088 ◽  
Author(s):  
Nan Zhang ◽  
Xiaohui Ma ◽  
Shengping Ruan ◽  
Yanyang Yin ◽  
Chuannan Li ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Ag Nanoparticles ◽  
Gas Sensing ◽  
Average Diameter ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Cds Nanowires ◽  
The Stability ◽  
Ethanol Sensing ◽  
The One

In this study, CdS nanowires (NWs)/Ag nanoparticle materials (CdS@Ag) with Schottky junction were synthesized by a simple process. The Ag nanoparticles with a diameter of 3–10 nm were uniformly scattered on the surface of CdS NWs with an average diameter of 30 nm. The gas sensing properties and the effect of Ag content and relative humidity on the ethanol sensing properties of CdS NWs were investigated in detail. When the relative humidity was below 60% RH, the sensor, especially the one based on [email protected], exhibited an enhanced ethanol sensing response and selectivity compared with that of pristine CdS NWs, which was believed that Ag catalyzed the reaction between ionized oxygen species and ethanol. However, excessive Ag content does not mean a higher response and even decreased the response. Also, the stability of CdS NWs and CdS@Ag NWs was also investigated, which were almost stable for four months.

TUNGSTEN-DOPED TiO2 NANOLAYERS WITH IMPROVED CO2 GAS SENSING PROPERTIES FOR ENVIRONMENTAL APPLICATIONS

2017 ◽  
Vol 24 (Supp02) ◽  
pp. 1850024 ◽  
Author(s):  
MALIHEH SABERI ◽  
ALI AKBAR ASHKARRAN
Keyword(s):  
Electron Microscopy ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Sol Gel ◽  
Optimum Operating ◽  
Optimum Operating Temperature ◽  
Sensing Properties ◽  
Vis Spectroscopy ◽  
Gas Sensing Properties ◽  
Tungsten Concentration

Tungsten-doped TiO2 gas sensors were successfully synthesized using sol–gel process and spin coating technique. The fabricated sensor was characterized by field emission scanning electron microscopy (FE-SEM), ultraviolet visible (UV–Vis) spectroscopy, transmission electron microscopy (TEM), X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Gas sensing properties of pristine and tungsten-doped TiO2 nanolayers (NLs) were probed by detection of CO2 gas. A series of experiments were conducted in order to find the optimum operating temperature of the prepared sensors and also the optimum value of tungsten concentration in TiO2 matrix. It was found that introducing tungsten into the TiO2 matrix enhanced the gas sensing performance. The maximum response was found to be (1.37) for 0.001[Formula: see text]g tungsten-doped TiO2 NLs at 200[Formula: see text]C as an optimum operating temperature.

In situ growth of WO3 nanotube arrays and their H2S gas sensing properties for reduced operating temperature

2020 ◽  
Vol 271 ◽  
pp. 127716
Author(s):  
Xiaoguang San ◽  
Yiming Lu ◽  
Guosheng Wang ◽  
Dan Meng ◽  
Xiaohui Gong ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
Nanotube Arrays ◽  
In Situ Growth ◽  
Sensing Properties ◽  
Gas Sensing Properties

A Formaldehyde Gas Sensor Based on Zinc Doped Lanthanum Ferrite

2013 ◽  
Vol 873 ◽  
pp. 304-310 ◽  
Author(s):  
Jin Zhang ◽  
Yu Min Zhang ◽  
Chang Yi Hu ◽  
Zhong Qi Zhu ◽  
Qing Ju Liu
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Sensing Properties ◽  
Transmission Electron ◽  
Lanthanum Ferrite ◽  
Gas Sensing Properties ◽  
Recovery Times ◽  
Response And Recovery ◽  
Sensing Characteristics

The gas-sensing properties of zinc doped lanthanum ferrite (Zn-LaFeO3) compounds for formaldehyde were investigated in this paper. Zn-LaFeO3 powders were prepared using sol-gel method combined with microwave chemical synthesis. The powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The formaldehyde gas-sensing characteristics for the sample were examined. The experimental results indicate that the sensor based on the sample Zn-LaFeO3 shows excellent gas-sensing properties to formaldehyde gas. At the optimal operating temperature of 250°C, the sensitivity of the sensor based on LaFe0.7Zn0.3O3 to 100ppm formaldehyde is 38, while to other test gases, the sensitivity is all lower than 20. The response and recovery times for the sample to formaldehyde gas are 100s and 100s, respectively.

scholarly journals Structural, Electrical, and Ethanol-Sensing Properties ofLa1-xNdxFeO3Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Nguyen Thi Thuy ◽  
Dang Le Minh ◽  
Ho Truong Giang ◽  
Nguyen Ngoc Toan
Keyword(s):  
Gas Sensing ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Gel Method ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Crystallite Sizes ◽  
Orthorhombic Perovskite ◽  
Ethanol Sensing ◽  
20 Nm

The nanocrystallineLa1-xNdxFeO3(0≤x ≤1.0) powders with orthorhombic perovskite phase were prepared by sol-gel method. The average crystallite sizes ofLa1-xNdxFeO3powders are about 20 nm. The resistance and gas-sensing properties of theLa1-xNdxFeO3based sensors were investigated in the temperature range from 160 to 300°C. The results demonstrated that the resistance and response of the perovskite thick films changed with the increase of Nd content.

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