| 초록 |
High performance gas sensors were fabricated from activated carbon fibers (ACFs) doped with CuO. The electroless CuO-ACFs was carried out to investigate the nitric oxide (NO) gas sensing ability with respect the plating time. As the plating time increased, the CuO content on the ACF surface increased, and the specific surface area of the ACFs decreased. The all of the ACFs showed p-type behavior and various resistance changes upon exposure to NO gas. The gas sensor fabricated from untreated ACFs showed a 4% resistance change, whereas the sensor with CuO-doped ACFs showed an approximately 12.5% resistance change and the response time was also fast, within 5 min. This phenomenon is attributed to the increased number of hole carriers in the ACFs due to CuO, which promotes electron transfer, and benefits the effective detection of NO gas. This method provides as a unique surface treatment strategy to improve the NO gas sensing efficiency. |
