| 초록 |
Exposure to excess amount of trimethylamine (TMA) can cause headaches, nausea, skin burns, and irritation to the eyes and respiratory system. Accordingly, the accurate detection of TMA could have critical implications for the indoor air monitoring and medical diagnoses. In this study, The Mo-doped ZnO hollow nanofibers for a highly sensitive and selective TMA sensor were produced by single capillary electrospinning, and their gas sensing characteristics toward 5ppm ethanol, TMA, CO and H2 were investigated. Mo-doped ZnO hollow nanofibers showed high response to 5 ppm TMA (Ra/Rg= 111.7, Ra: resistance in air, Rg: resistance in gas) at 400oC, while the response of pure ZnO hollow nanofibers was low (Ra/Rg= 47.1). In addition, the selectivity toward TMA was enhanced by the doping of Mo in ZnO hollow nanofibers. The enhancement of gas response and selectivity toward TMA by Mo doping in ZnO nanofibers was discussed in relation to the acid-base interaction between TMA, the basic analyte gas and molybdenum oxide, the acidic doped materials. |
