In2O3 Nanotower Hydrogen Gas Sensors Based on Both Schottky Junction and Thermoelectronic Emission

Zheng, Zhaoqiang; Zhu, Liyang; Wang, Bing

doi:10.1515/nano.11671_2015.3

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…In case of hydrogen, the dissociation of the molecules over the Pd contact is faster and diffuse the hydrogen atom to the interface due to smallest molecular size 23 , 43 . Moreover, the conduction of ZnO nanorods is correlated with cross section and given as follow 44 , where G, n, e, l, and µ are electrical conductivity, electron concentration, length of NR and electron mobility, respectively.…”

Section: Discussionmentioning

confidence: 99%

Pd/ZnO nanorods based sensor for highly selective detection of extremely low concentration hydrogen

Kumar

Bhati

Ranwa

et al. 2017

Sci Rep

110

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We report highly hydrogen selective Pd contacted ZnO nanorods based sensor detecting low concentration even at low operating temperature of 50 °C. The sensor performance was investigated for various gases such as H2, CH4, H2S and CO2 at different operating temperatures from 50 °C to 175 °C for various gas concentrations ranging from 7 ppm to 10,000 ppm (1%). The sensor is highly efficient as it detects hydrogen even at low concentration of ~7 ppm and at operating temperature of 50 °C. The sensor’s minimum limit of detection and relative response at 175 °C were found 7 ppm with ~38.7% for H2, 110 ppm with ~6.08% for CH4, 500 ppm with ~10.06% for H2S and 1% with ~11.87% for CO2. Here, Pd exhibits dual characteristics as metal contact and excellent catalyst to hydrogen molecules. The activation energy was calculated for all the gases and found lowest ~3.658 kJ/mol for H2. Low activation energy accelerates desorption reactions and enhances the sensor’s performance.

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Section: Discussionmentioning

confidence: 99%

Pd/ZnO nanorods based sensor for highly selective detection of extremely low concentration hydrogen

Kumar

Bhati

Ranwa

et al. 2017

Sci Rep

110

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show abstract

“…For this reason, the In 2 O 3 -CuO mixture sensor does not obtain a response at room temperature or at lower temperatures, while the response is as high as possible when the actual thermal energy (100 o C) is given for the reaction, reaching to the optimum temperature. Also, we note that above this temperature, the response was decreased, due to the desorbed of oxygen ions from the surface of the sensor [7,[20][21][22].…”

Section: -3 Gas Sensor Characteristicsmentioning

confidence: 99%

Preparation and Characterization of In2O3-CuO Nanocomposite Thin Films as NH3 Gas Sensor

Hameed

AL-Jumaili

2021

eijs

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An NH3 gas sensor was prepared from nanocomposite films of indium oxide-copper oxide mixtures with ratios of 0 , 10 , and 20 Vol % of copper oxide. The films were deposited on a glass substrate using chemical spray pyrolysis method (CSP) at 400oC. The structural properties were studied by using X-ray diffraction (XRD) and atomic force microscopy ( AFM). The structural results showed that the prepared thin films are polycrystalline, with nano grain size. By mixing copper oxide with indium oxide, the grain size of the prepared thin films was decreased and the surface roughness was increased. The UV-Visible spectrometer analysis showed that the prepared thin films have high transmittance. This transmittance was decreased by mixing copper oxide with indium oxide. The direct optical energy gap ranged 3.5 - 3 eV, which was decreased with increasing copper oxide concentration. The sensitivity of the prepared gas sensor was measured towards NH3 gas at a concentration of 71ppm with operating temperatures of 100, 150, 200, 250 and 30) oC, according to the change of sensor resistance. This sensitivity of the mixture oxides showed a value of about nine times greater than that of individual indium oxide thin films. The results of the optimum gas sensor properties demonstrated a sensitivity value of 75.06%, response time of 10s, and recovery time of 11 s, at a mixing ratio of 20% of copper oxide and an operating temperature of 200oC.

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In2O3 Nanotower Hydrogen Gas Sensors Based on Both Schottky Junction and Thermoelectronic Emission

Cited by 2 publications

References 34 publications

Pd/ZnO nanorods based sensor for highly selective detection of extremely low concentration hydrogen

Pd/ZnO nanorods based sensor for highly selective detection of extremely low concentration hydrogen

Preparation and Characterization of In2O3-CuO Nanocomposite Thin Films as NH3 Gas Sensor

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