Detection of a nerve agent simulant using single-walled carbon nanotube networks: dimethyl-methyl-phosphonate |
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Authors: | Kim Yeonju Lee Seunghyun Choi Hyang Hee Noh Jin-Seo Lee Wooyoung |
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Affiliation: | Department of Materials Science and Engineering, Yonsei University, Seoul, Korea. |
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Abstract: | Single-walled carbon nanotube (SWNT) networks were used to detect hazardous dimethyl-methyl-phosphonate (DMMP) gas in real time, employing two different metals as electrodes. Random networks of SWNTs were simply obtained by drop-casting a SWNT-containing solution onto a surface-oxidized Si substrate. Although the electrical responses to DMMP at room temperature were reversible for both metals, the Pd-contacting SWNT network sensors exhibited a higher response and a shorter response time than those of the Au-contacting SWNT network sensors at the same DMMP concentration, due to the stronger interactions between the SWNTs and Pd surface atoms. In Pd-contacting SWNT network sensors, the response increased linearly with increasing DMMP concentration and reproducible response curves were obtained for DMMP levels as low as 1 ppm. These results indicate that SWNT networks in contact with Pd electrodes can function as good DMMP sensors at room temperature with scalable and fast response and excellent recovery. |
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