Selective Oxidizing Gas Sensing and Dominant Sensing Mechanism of n-CaO-Decorated n-ZnO Nanorod Sensors
- Authors
- Sun, Gun-Joo; Lee, Jae Kyung; Choi, Seungbok; Lee, Wan In; Kim, Hyoun Woo; Lee, Chongmu
- Issue Date
- Mar-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- CaO; ZnO; decoration; gas sensor; NO2
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.9, no.11, pp.9975 - 9985
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 9
- Number
- 11
- Start Page
- 9975
- End Page
- 9985
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/20531
- DOI
- 10.1021/acsami.6b15995
- ISSN
- 1944-8244
- 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.
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