2020-07-02· In this investigation, gas sensors based on zinc oxide (ZnO) nanorods (NRs) with Co concentration were successfully fabricated and explored. A 100 nm-thick ZnO film was deposited as a seed layer onto Corning glass substrate via radio frequency (RF) magnetron sputtering technique.
2007-12-06· Oxide semiconductor ZnO has been extensively studied as a gas sensor detecting gases such as CH 4, CO, H 2, C 2 H 5 OH, Cl, and H 2 S [1–9], based on the resisivity changes from adsorption/desorption and reactions with target forms of sensors have been fabricated including single crystal [], sintered bodies [1, 6], thick layers [], thin films [2, 3, 5, 7], and nano …
2019-03-22· Among them, zinc oxide (ZnO), as an n-type semiconductor material, was a promising material for gas sensor which has been extensively explored for many years due to its wide direct band gap (– eV at 300 K), large exciton binding energy (60 eV), high electron mobility, non-toxicity, high-specific surface area, good chemical and thermal stability [ 9 – 11 ].
2020-04-23· The prepared gas sensor exhibits a response of 74% towards 80 ppm of CO gas with a response/recovery times of 21 and 70 s, respectively at 250 °C and high stability with time. The good sensing properties of ZnO nanoparticles towards CO gas indicate their potential application for the fabrication of low power and highly selective sensors.
2020-02-01· ZnO nanostructures-based gas sensors are one of the most eligible candidates where a real-time detection of explosive and toxic gases is needed. On this subject, numerous efforts have been made to improve the sensing response at reduced working temperature with the assistance of …
2019-07-26· Fabrication of gas sensors. ZnO/SiC nanocomposites containing 0, 15, 30, 45 and 100 mol % SiC were prepared by mixing components in a single homogeneous paste using a solution of α-terpineol in ethanol as a binder. The sensors were fabricated by thick film technology via drop-deposition of the paste onto alumina micro-hotplates provided with vapor-deposited Pt contacts ( × mm 2 ...
2014-12-16· The five parameters viz. gas response, recovery time, response time, selectivity, and detection limit depend upon the morphology, size, and surface area of the ZnO nanomaterials, the interaction between the gas and the sensor, concentration of NO 2 gas, the operating temperature, etc. High-temperature annealing of the ZnO nanostructures results in the agglomeration into large entities. …
Various ZnO gas sensors have been researched extensively and the detected gases include CO, NO 2, NH 3, H 2 S, ethanol, acetone, formaldehyde and so on [68,69]; according to the characteristics of the used ZnO materials, they can be roughly divided into conventional n-type ZnO nanomaterials, specially doped ZnO nanomaterials and some ZnO complexes. In addition, some studies have shown that ...
2014-06-01· Among these metal oxides, the utilization of ZnO in gas sensor applications has a long history; it was used in chemo-resistive sensors to detect several gases, such as H2, NH 3, CH 4, O 2, ethanol and CO,,,,,,.
2020-03-11· The sensor with these ZnO nanorods presented a remarkable response at % toward 100 ppm CO gas exposure and recovery time of approximately min. The microwave-assisted hydrolysis is an excellent approach to fabricate ZnO nanorods used for low-concentration CO gas detection system at room temperature. Gas-solution-solid method. ZnO nanorod arrays on Zn …
Zinc Oxide (ZnO) nanorods based gas sensor for sensing CO gas is fabricated using a hydrothermal method over a rigid substrate. PEDOT: PSS is used to establish p-type over n-type ZnO nanorods. The ...
ZnO-based sensor structures in some selected gaseous en- vironment were tested consists of a measurement cham- ber (in which the tested structure is placed), the source of light, sp ectrometer and a system of batching the gas.
In this investigation, gas sensors based on zinc oxide (ZnO) nanorods (NRs) with Co concentration were successfully fabricated and explored. A 100 nm-thick ZnO film was deposited as a seed layer ...
The gas-sensing experiment results on optimum working temperature (Co-ZnO: 160 °C, pure ZnO: 180 °C), response-recovery time (Co-ZnO: 30-33 s, pure ZnO: 35-51 s), sensitivity (Co-ZnO: , pure ZnO: ; 200 ppm C 2 H 2), the limit of detection (3 ppm, Co-ZnO), stability (20, 50, 100, 200, 400 ppm C 2 H 2), and selectivity (H 2, CH 4, C 2 H 2, C 2 H 4; 50, 100, 200 ppm) are obtained ...
Zinc oxide-based materials are promising for use as CO sensors, owing to their good sensing response, electrical performance, cost-effectiveness, long-term stability, low power consumption, ease of manufacturing, chemical stability, and non-toxicity. Nevertheless, further progress in gas sensing requires improving the selectivity and sensitivity, and lowering the operating temperature ...
2017-02-01· However, being a promising material for the gas sensor device for monitoring some gases like CO and H 2 S and CH 4 9, ZnO still faces many problems such as poor sensitivity, high operating ...
At higher 10ppm temperatures, the gas response is reduced due to the desorption of 20ppm CO, which decreases the amount of CO adsorbed on the ZnO surface. The response of the undoped ZnO sensor shows a maximum 50ppm 50ppm at 250 C. For Al-doped sensors, it appears that Al doping strongly favors sensitivity toward carbon monoxide.
2020-01-01· ZnO is a promising candidate as CO gas sensor due to nontoxic, inexpensive, wide band gap ( eV) and high exciton binding energy (60 meV) n-type semiconductor . In addition, nanosized ZnO possess unique properties in fluorescence [ 7 ], catalytic [ 8 , 9 ], piezoelectric [ 10 ] and are potential candidates for nanoscale electronic and optoelectronic devices [ 11 , 12 ].
The hybrid ZnO NRs/NCD sensor showed a remarkably enhanced NO 2 response compared to the ZnO NRs sensor. Further, inspired by this special hybrid structure, the simulation of interaction between the gas molecules (NO 2 and CO 2) and hybrid ZnO NRs/NCD sensor was studied using DFT calculations.
The sensors studied in this review operate at low temperatures (T < 200 °C).When the sensor is exposed to the oxidizing gas such as NO 2, the gas molecules will not only capture the electrons in the conduction band of ZnO, but also interact with the oxygen species adsorbed on the surface of ZnO, resulting in an increase in the width of the electron depletion layer and junction potential ...
2017-10-01· Optical gas sensors provide an alternative over the conventional conductometric gas sensors. Carbon monoxide (CO) gas is generally regarded as one of the most dangerous air pollutants, hence, a room temperature operated CO gas sensor using ZnO sensing film deposited on Au coated prisms has been developed using an indigenously developed surface plasmon resonance (SPR) …
2018-12-27· The sensors have been tested at different operating temperatures. At 250 °C, the sensor shows the best response for CdZnO thin films. We have obtained sensor response with response time 15 sec for 100-PPM carbon mono oxide (CO) gas concentration for CdZnO thin film. Based on experimental results, Cd-doped ZnO has been found most suitable ...
electrode material and recording their resistance in air and in presence of CO gas. Fe-ZnO thin film was found to be more sensitive compared to ZnO thin films having good stability over the days. Keywords: Fe-ZnO thin films, CO sensors. Asian Journal of Chemistry; Vol. 30, No. 12 (2018), 2737-2742 This is an open access journal, and articles are distributed under the terms of the Creative ...
Al-doped ZnO films were deposited onto SiO2/Si substrates by rf magnetron sputtering system as a CO gas sensor. The dependence of the thin film thickness on CO gas sensing properties was ...
activated ZnO-TiO 2 thick film for CO 2 gas sensor *R. B. Pedhekar 1, F. C. Raghuwanshi 2 1 Department of Physics, M. J. Fule Commerce, Science & V. Raut Arts College, Bhatkuli, India 2 Department of Physics,Vidya Bharati Mahavidhyalay, Amravati, India Corresponding Author: *R. B. Pedhekar email: [email protected] Abstract: Nanocrystalline ZnO-TiO 2 (molar ratio 9:1, …
2017-11-01· Till date, zinc oxide (ZnO) as semiconducting metal oxide is considered as the promising resistive-type gas sensing material, but elevated operating temperature becomes the bottleneck of its extensive applications in the field of real-time gas monitoring, especially in …
2015-05-10· In addition, Gong et al. [ 16] have fabricated Co-doped ZnO thin films by co-sputtering as a CO gas sensor. It was found that Co-doped ZnO-based sensor exhibited the highest sensitivity to CO at 350 °C. An obvious change in resistance of the CZO film was also observed when the sensor was exposed to 6 ppm CO at 150 °C.
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