Selective Oxidizing Gas Sensing and Dominant Sensing Mechanism of n-CaO-Decorated n-ZnO Nanorod Sensors
| Autor: | Seung-Bok Choi, Hyoun Woo Kim, Wan In Lee, Jae Kyung Lee, Gun-Joo Sun, Chongmu Lee |
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| Rok vydání: | 2017 |
| Předmět: |
Nanostructure
Conduction channel Materials science business.industry Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Depletion region Modulation Oxidizing agent Optoelectronics Rectangular potential barrier General Materials Science Nanorod 0210 nano-technology business |
| Zdroj: | ACS Applied Materials & Interfaces. 9:9975-9985 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.6b15995 |
| Popis: | 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 chemiresistive 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 ... |
| Databáze: | OpenAIRE |
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