Selective Oxidizing Gas Sensing and Dominant Sensing Mechanism of n-CaO-Decorated n-ZnO Nanorod Sensors
- Title
- Selective Oxidizing Gas Sensing and Dominant Sensing Mechanism of n-CaO-Decorated n-ZnO Nanorod Sensors
- Author
- 김현우
- Keywords
- CaO; ZnO; decoration; gas sensor; NO2
- Issue Date
- 2017-02
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v. 9, no. 11, page. 9975-9985
- Abstract
- In this work, we investigated the NO2 and CO sensing, properties of n-CaO-decorated n-ZnO nanorods and the dominant sensing mechanism in n-n heterostructured one-dimensional (1D) nanostructured multinetworked chem-iresistive gas sensors utilizing the nanorods. The CaO-decorated n-ZnO nanorods showed stronger response to NO2 than most other ZnO-based nanostructures, including the, pristine ZnO nanorods. Many researchers have attributed the enhanced sensing, performance of heterostructured sensors to the modulation of the conduction channel-width or surface depletion layer width. However, the modulation of the conduction channel width is not the true cause of the enhanced sensing performance of n n heterostructured 1D gas sensors, because the radial modulation of the conduction channel width is not intensified in these-sensors. In this work, we demonstrate that the enhanced performance of the n-CaO-decorated n-ZnO nanorod sensor is mainly due to a combination of the enhanced modulation of the potential barrier height at the n n heterojunctions, the larger surface-area-to-volume ratio and the increased surface defect density of the decorated ZnO nanorods, not the enhanced modulation of the conduction channel width.
- URI
- https://pubs.acs.org/doi/10.1021/acsami.6b15995https://repository.hanyang.ac.kr/handle/20.500.11754/112632
- ISSN
- 1944-8244; 1944-8252
- DOI
- 10.1021/acsami.6b15995
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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