| 초록 |
Gas sensors that respond reversibly and quantitatively to the presence of a gaseous analyte by changing useful signals have been widely used in broad fields such as food processing, medical diagnosis, fuel control for automobiles, aerospace vehicles, and environmental monitoring. Among the various type of gas sensors, semiconducting gas sensors based on metal oxides such as TiO2, SnO2, WO3, and NiO offer good advantages due to their simple implementation, low cost, and good reliability for real-time control systems. High sensitivity is one of the most important parameters for high-performance gas sensors. Accordingly, various nanostructures such as nanoparticles, nanorods, nanowires, nanotubes, nanobelts, and nanofibers to enhance gas reactions have been widely studied for their application in gas sensors. Because most of the nanostructured materials are usually synthesized using wet chemical methods, achieving large-area uniformity and reliable channel conductivity has remained a challenge for practical application. Recently, a variety of synthetic pathways have been proposed for the development of these nanostructures. In particular, soft/hard-templating methods are considered to be the strongest alternatives. In this presentation, I will introduce large-scale fabrication techniques via soft/hard-templating methods using glancing angle deposition, proximity-field nanopatterning, and polystyrene nanobeads. In addition, I will present their gas sensing properties and discuss a novel design concept for achieving high-performance gas sensors. |
