Abstract A model for the detection of CO in the presence of humidity is proposed for thick porous film gas sensors based on ptype CuO. The sensing mechanism is investigated by means of simultaneous DC electrical resistance and work function changes measurements combined with appropriate modeling of the conduction in the polycrystalline sensing film.
01/01/2015· 4. Conclusions In this work we have investigated the gas sensing behavior of CuONPs towards CO2 by the means of work function readout based on Kelvin probe measurements. The sensitivity of CuONPs is found out to be dependent on both relative humidity level in the environment and the temperature. The measurements indicate that the highest CO2 change in work function response is achievable at the temperature of 50°C; however the influence of humidity is still quite high on CO2 ...
The gas sensing measurements were recorded with the help of Kelvin probe that can measure the change in work function of the sensitive layers when exposed to CO. We detected the enhancement in …
27/01/2021· In the present work, a gas sensor based on zinc oxide/copper oxides composite nanostructure (ZCS) has been prepared to meet lowlevel acetonesensing requirements. The XRD, FESEM, EDS, and BET analysis confirmed the presence of hexagonal wurtzite ZnO and monoclinic CuO in the composite nanostructure with nanorod morphology. The response ...
Ptype CuO Nanowires and thin Film for Highly Sensitive Kelvin Probe Gas Sensing Applications By Mazhar, G. Faglia, C. Baratto, E. Comini, D. Zappa, R. Kumar and G. Sberveglieri Cite
09/03/2020· lowtemperature coprecipitation method. Zinc doping in CuO created surface defects that enhanced oxygen adsorption on the surface crucial for gas sensing applications. Pure and Zndoped CuO sensor films were realized using the doctor blade method. The sensor films showed selective response towards a low concentration of NO2 at a lower operating temperature of 150 C. Doping with …
Optimization study for work function based CO 2 sensing using CuOnanoparticles in respect to humidity and temperature Tanvira,b, O ... Kelvin method 1. Introduction CO 2 as a target gas has ...
15/08/2021· Their sensing responses for CO gas were compared; typical for ptype semiconductors, the resistances of both sensing materials increased as CO was introduced. The CuOTiNTiO2 powder had a greater response than the CuOTiN powder at all temperatures tested. The highest responses shown by the two materials were to 1000 ppm CO at 250 °C: a response of by CuOTiNTiO2 and by CuO …
20/04/2011· A model for the detection of CO in the presence of humidity is proposed for thick porous film gas sensors based on ptype CuO. The sensing mechanism is investigated by means of simultaneous DC electrical resistance and work function changes measurements combined with appropriate modeling of the conduction in the polycrystalline sensing film.
Ptype CuO appears to be a good candidate for gas sensing applications. And surface morphology of this material plays a vital role in affecting its sensitivity towards various gases when analysed by Kelvin probe surface workfunction sensing scheme. We determined that CuO shows high sensitivity to carbon monoxide only in the form of nanowires. Whereas CuO thin film shows good sensitivity to NH
The special properties of CuONPs with respect to CO 2 gas sensing at room temperature were investigated with the help of work function (Kelvin probe) based readout. The formation of hydroxocarbonate species (malachite and azurite) as a main reaction leading to the change in work function was proved with the help of FTIR measurements and thermodynamical considerations. Our Kelvin …
19/12/2019· Title: CO GasSensing at Low Temperature Using CuO Thin FilmsAuthor: Sumita Choudhary{1}, Ajay Agarwal{2}, Arnab Hazra{1}, Subhashis Gangopadhyay{1}Affiliati...
We report on conductometric gas sensors based on single CuO nanowires and compare the carbon monoxide (CO) sensing properties of pristine as well as Pd nanoparticle decorated devices in humid atmosphere. Magnetron sputter inert gas aggregation combined with a quadrupole mass filter for cluster size selection was used for singlestep Pd nanoparticle deposition in the soft landing regime ...
01/03/2018· The alteration in sensing behavior of CuO‐ZnO NPs under moisture suggests that water adsorption is playing an important role in CO 2 gas sensing mechanism. The crucial role of humidity for CuO based CO 2 sensing was also shown previously through Kelvin Probe investigations for room temperature and moderate temperature range [20] , [21] , [22] , [23] .
05/01/2021· The sensing response of nanoCuO coated samples to CO gas was tested in a chamber. Then, the quantity of targeted CO gas (typically 200 ppm) was injected into the testing chamber. The resistance of sensor was recorded when it reached a constant value after 27 min. Then, the testing chamber was vented. The inverse relation between the grain size and resistance was observed from …
01/01/2016· The gas sensing measurements were recorded with the help of Kelvin probe that can measure the change in work function of the sensitive layers when exposed to CO. We detected the enhancement in the CO gas sensing properties of ntype nanocrystalline CeO2 by the introduction of ptype CuO nanoparticles at room temperature. Moreover the inclusion of temperature (T = 100°C), induced a relatively negative impact in the gas sensing …
01/08/2017· In order to further demonstrate the important role of the presence of water for the CO 2 sensing mechanism with CuO‐NPs, Kelvin probe measurements in dry air were performed. Fig. 3 shows the comparison of Kelvin probe measurements between non‐dried, 24 h‐dried and 48 h‐dried at 100 °C CuO‐NPs layers.
The gas sensing measurements were recorded with the help of Kelvin probe that can measure the change in work function of the sensitive layers when exposed to CO. We detected the enhancement in …
09/12/2016· Gas sensing properties of Co 3 O 4 CuO composite nanochains. The sensing responses of pristine CuO, Co 3 O 4, CCNC1, CCNC2, and CCNC3 to NH 3 at RT are shown in Figs. 6, 7, Table S6, and Table S7. Figure 6. a Gas responses and b response times of all samples; c, d stability test for the CCNC2 thinfilm sensor at the NH 3 concentrations of 10, 5, and 3 ppm, the inset …
09/04/2015· We report on conductometric gas sensors based on single CuO nanowires and compare the carbon monoxide (CO) sensing properties of pristine as well as Pd nanoparticle decorated devices in humid atmosphere. Magnetron sputter inert gas aggregation combined with a quadrupole mass filter for cluster size selection was used for singlestep Pd nanoparticle deposition in the soft landing regime ...
CuO is a narrow bandgap ( eV) ptype semiconductor with photoconductive and photochemical properties and has found applications in gas sensing [3, 4], in catalysis [5–7], as antimicrobial agent [8–11], and in batteries , magnetic devices [13–15], super capacitors , and field emission .
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