| 초록 |
We explained the history and current status, in regard to the development of resistance0type semiconductor gas sensors. In order to attain the high-performance gas sensing, significant efforts were carried out, including the development of structure/architecture, the incorporation of new materials, and the modification of the sensor surface. Metal oxide semiconducting nanostructures exhibit a high sensitivity for gas detection, owing to their exceptionally high surface-to-volume ratio, the smallest dimension comparable to the Debye length, the quantum confinement for attaining high carrier mobility, and the self-heating behavior for attaining room-temperature sensor. Notably, the presence of nanograins within nanofibers further intensifies the resistance modulation observed due to this transition. Various nanocomposites not only utilize the sensing materials with inherently advantageous characteristics, but also these structures create local heterojunctions, achieving the best sensing performance. |
