An 8 MeV Electron Beam Modified In:ZnO Thin Films for CO Gas Sensing towards Low Concentration
| Autor: | Igor Shchetinin, K.K. Nagaraja, Aninamol Ani, P. Poornesh, Jishnu Dwivedi, Vijay Pal Verma, Evgeny Kolesnikov, Suresh D. Kulkarni, Ashok Rao, Albin Antony, Gopalkrishna Hegde, Vikash Chandra Petwal |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Photoluminescence General Chemical Engineering Doping Analytical chemistry chemistry.chemical_element Article electron beam irradiation Chemistry Adsorption indium-doped ZnO chemistry General Materials Science Grain boundary Irradiation Thin film QD1-999 Indium CO gas sensing Wurtzite crystal structure |
| Zdroj: | Nanomaterials; Volume 11; Issue 11; Pages: 3151 Nanomaterials, Vol 11, Iss 3151, p 3151 (2021) Nanomaterials |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano11113151 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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