Abstract
We report here excellent H2 gas response property of Co-doped ZnO nanorods (Co:ZnO NRs). Co:ZnO NRs have been synthesized by hydrothermal method by varying the Co content from 0 to 10mol%. It is found that Co:ZnO NRs with 8mol% of Co exhibits the highest and faster H2 gas response ability compared to the undoped ZnO resulting in a ∼5 fold enhancement in the gas response in the presence of air at 150°C. While the gas response value (S (%)=[(Ig-Ia)/Ia]×100, where Ia is the current of the sensors in the presence of air only and Ig is the current in the presence of certain H2 concentration) to 3000ppm H2 for undoped ZnO NRs’sensor is 11%, an unprecedented high value of 53.7% is obtained for the Co:ZnO with 8mol% of Co. Based on the electrical current and photoluminescence results, a mechanism for the enhanced H2 response of Co:ZnO is proposed that involves donor-related oxygen vacancies (VO) introduced by the Co dopants in the ZnO lattice.
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