scholarly journals Effect of Silver Addition on the Ethanol-Sensing Properties of Indium Oxide Nanoparticle Layers: Optical Absorption Study

2007 ◽  
Vol 2007 ◽  
pp. 1-5 ◽  
Author(s):  
Vidya Nand Singh ◽  
Bodh Raj Mehta ◽  
Rakesh Kumar Joshi ◽  
Frank Einar Kruis
Keyword(s):  
Optical Absorption ◽  
Gas Sensing ◽  
Dip Coating ◽  
Optical Absorption Study ◽  
Step Method ◽  
Silver Addition ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Oxide Nanoparticle ◽  
Ethanol Sensing

In2O3andIn2O3:Ag nanoparticle layers have been deposited using a two-step method consisting of chemical capping and dip coating techniques. The result of optical absorption analysis ofIn2O3:Ag samples shows the presence ofAg2Oand Ag in air-annealed and vacuum-annealed samples, respectively. These results have been correlated with the gas sensing properties of these layers towards ethanol and support the proposed mechanism that increase in sensor response on Ag addition is due to the conversion ofAg2Oto Ag in the presence of ethanol.

A Two‐Step Method Synthesis and Gas Sensing Properties of CoSnO 3 Nanoparticles

2019 ◽  
Vol 4 (25) ◽  
pp. 7591-7595 ◽  
Author(s):  
Ting Li ◽  
Zhidong Lin ◽  
Ping Fu ◽  
Shenggao Wang ◽  
Zhe Chen ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Step Method ◽  
Sensing Properties ◽  
Gas Sensing Properties

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.

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.

Room Temperature Ammonia Gas Sensing Properties of Biosynthesized tin Oxide Nanoparticle Thin Films

2015 ◽  
Vol 11 (2) ◽  
pp. 253-260 ◽  
Author(s):  
Ketan Gattu ◽  
Kalyani Ghule ◽  
Anil Kashale ◽  
R.S. Mane ◽  
Ramphal Sharma ◽  
...  
Keyword(s):  
Thin Films ◽  
Tin Oxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Oxide Nanoparticle

Study on Gas Sensing Properties of WO3 Thin Films

2007 ◽  
Vol 280-283 ◽  
pp. 319-322
Author(s):  
Miao Jiang ◽  
Feng Hou ◽  
Ting Xian Xu ◽  
Ming Xia Xu
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Sol Gel ◽  
Chelating Agent ◽  
Response Speed ◽  
Dip Coating ◽  
Tungstic Acid ◽  
Sensing Properties ◽  
Average Grain Size ◽  
Gas Sensing Properties

Tungsten oxide thin films were prepared by an inorganic-sol-gel dip-coating process, where the sol was obtained by adding citric acid, as chelating agent, to the ammonia solution of tungstic acid. The resultant thin films were a mixture of monoclinic and tetragonal phases of WO3 and, after being pretreated at 600°C and sintered at 650°C, the average grain size of the polycrystalline films was about 500 nm. The gas-sensing properties of WO3 thin films were tested at temperatures ranging from 500° to 600°C and in nitrogen gas containing 5vol% O2 or 5vol% H2. The WO3 sensors exhibited a good sensitivity and response speed at the temperature of 550°C.

Gas Sensing Properties of Chemically Synthesized V2O5 Thin Films

2010 ◽  
Vol 123-125 ◽  
pp. 683-686 ◽  
Author(s):  
A. Dhayal Raj ◽  
D. Mangalaraj ◽  
N. Ponpandian ◽  
Junsin Yi
Keyword(s):  
Hydrogen Peroxide ◽  
Gas Sensing ◽  
Sol Gel ◽  
Dip Coating ◽  
Sensing Element ◽  
Sensing Properties ◽  
Copper Electrodes ◽  
Gas Sensing Properties ◽  
Concentration Sensitivity ◽  
Dip Coating Technique

Nanostructured vanadium pentoxide films have been synthesized by using a sol–gel technology from V2O5 powder and hydrogen peroxide. The V2O5 powder was dissolved in hydrogen peroxide solution, agitated and heated up to 65oC to form gel by the dissociation of the peroxide complexes. The obtained gel was deposited by dip coating technique and dried in air at room temperature. Structural, morphological and compositional analyses were carried out on the prepared samples using X-Ray Diffractometer (XRD), Raman spectrometer and scanning electron microscopy (SEM). The as-prepared films show an amorphous nature, while those annealed at 400oC exhibit orthorhombic structures. The films seem to have grain like structures on annealing which are expected to help the gas sensing properties of the V2O5 films. The annealed films were connected with copper electrodes and used as sensing element. The change in the resistance of the sensing element with respect to the test gas concentration was measured by noting down the resistance at each concentration. Sensitivity of the material linearly increased with different concentrations of ethanol and ammonia. It is clearly seen that the material has more sensing response for ethanol when compared to that of ammonia.

Flower-like In2O3 hierarchical nanostructures: synthesis, characterization, and gas sensing properties

RSC Advances ◽  
2014 ◽  
Vol 4 (91) ◽  
pp. 50241-50248 ◽  
Author(s):  
Dan Han ◽  
Peng Song ◽  
Huihui Zhang ◽  
Huihui Yan ◽  
Qi Xu ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Gas Sensing ◽  
Hierarchical Nanostructures ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
One Step ◽  
Ethanol Sensing ◽  
Sensing Performance

Flower-like In2O3 nanostructures with superior ethanol sensing performance were synthesized by annealing In(OH)3 precursor prepared via a one-step hydrothermal method.

scholarly journals Ferric Oxide Nanoparticle-functionalized Tungsten Oxide Nanoneedles and their Gas Sensing Properties

2015 ◽  
Vol 120 ◽  
pp. 443-446 ◽  
Author(s):  
S. Vallejos ◽  
I. Gràcia ◽  
E. Figueras ◽  
J. Prášek ◽  
J. Sedláček ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Ferric Oxide ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Oxide Nanoparticle

Room temperature ethanol gas-sensing properties based on Ag-doped MoSe2 nanoflowers: experimental and DFT investigation

2021 ◽  
Author(s):  
Tingting Li ◽  
Sujing Yu ◽  
Qi Li ◽  
Minghe Chi ◽  
Peng Li
Keyword(s):  
Hydrothermal Method ◽  
High Purity ◽  
Room Temperature ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Ethanol Sensing

An Ag-doped MoSe2 nanomaterial-based sensor was fabricated for ppb-level ethanol sensing at room temperature. The MoSe2 and Ag-modified MoSe2 nano-flowers were synthesized by a hydrothermal method, which exhibited high purity...

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