Effect of electron irradiation on gas sensing properties of Al-Zno

Vattappalam, Sunil C.; Thomas, Deepu; Augustine, Saji; Mathew, Saleena

doi:10.1080/23311940.2015.1019664

Cited by 10 publications

(1 citation statement)

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“…Vattappalam et.al. [29] subjected the silar synthesized Al:ZnO thin films to electron beam irradiation with dose rates 6 and 8 kGy. The average sensitivity towards ethanol vapour is found to be 0.50 and 0.60 for unirradiated and irradiated thin films.…”

Section: Introductionmentioning

confidence: 99%

An 8 MeV Electron Beam Modified In:ZnO Thin Films for CO Gas Sensing towards Low Concentration

et al. 2021

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In the present investigation, electron beam-influenced modifications on the CO gas sensing properties of indium doped ZnO (IZO) thin films were reported. Dose rates of 5, 10, and 15 kGy were irradiated to the IZO nano films while maintaining the In doping concentration to be 15 wt%. The wurtzite structure of IZO films is observed from XRD studies post electron beam irradiation, confirming structural stability, even in the intense radiation environment. The surface morphological studies by SEM confirms the granular structure with distinct and sharp grain boundaries for 5 kGy and 10 kGy irradiated films whereas the IZO film irradiated at 15 kGy shows the deterioration of defined grains. The presence of defects viz oxygen vacancies, interstitials are recorded from room temperature photoluminescence (RTPL) studies. The CO gas sensing estimations were executed at an optimized operating temperature of 300 °C for 1 ppm, 2 ppm, 3 ppm, 4 ppm, and 5 ppm. The 10 kGy treated IZO film displayed an enhanced sensor response of 2.61 towards low concentrations of 1 ppm and 4.35 towards 5 ppm. The enhancement in sensor response after irradiation is assigned to the growth in oxygen vacancies and well-defined grain boundaries since the former and latter act as vital adsorption locations for the CO gas.

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Section: Introductionmentioning

confidence: 99%

An 8 MeV Electron Beam Modified In:ZnO Thin Films for CO Gas Sensing towards Low Concentration

et al. 2021

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Enhanced LPG Sensitivity for Electron Beam Irradiated Al‐ZnO Nanoparticles

Vattappalam

Thomas

Ponnamma

et al. 2020

Macromolecular Symposia

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Al doped and un‐doped ZnO thin films are coated on glass substrate by successive ionic layer adsorption and reaction technique with varying doping concentrations of Al from 3 to 7 at%. The samples are annealed at 450 °C for 1 h in the air. The structural and morphological analysis of the samples are carried out using XRD and SEM. The samples are irradiated with high energy electron beam at a dosage of 5 kGy and its sensing properties are explored. It is observed that the irradiated samples show an enhanced sensitivity to liquefied petroleum gas than that of unirradiated samples at the same doping concentration. The higher response and recovery time of irradiated samples are compared with unirradiated samples. The maximum sensitivity (S = 0.35) with faster recovery time of 25 s is observed for the 7% doped Al‐ZnO thin irradiated film.

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