State key laboratory of Superhard materials, Jilin University , Changchun 130012, PR China.
Sci Rep. 2013;3:1250. doi: 10.1038/srep01250. Epub 2013 Feb 13.
Heterostructure material that acts as resonant tunneling system is a major scientific challenge in applied physics. Herein, we report a resonant tunneling system, quasi-2D Cu(2)O/SnO(2) p-n heterostructure multi-layer film, prepared by electrochemical deposition in a quasi-2D ultra-thin liquid layer. By applying a special half-sine deposition potential across the electrodes, Cu(2)O and SnO(2) selectively and periodically deposited according to their reduction potentials. The as-prepared heterostructure film displays excellent sensitivity to H(2)S at room temperature due to the resonant tunneling modulation. Furthermore, it is found that the laser illumination could enhance the gas response, and the mechanism with laser illumination is discussed. It is the first report on gas sensing application of resonant tunneling modulation. Hence, heterostructure material act as resonant tunneling system is believed to be an ideal candidate for further improvement of room temperature gas sensing.
作为共振隧穿系统的异质结构材料是应用物理中的一个重大科学挑战。在此，我们报告了一个共振隧穿系统，即准二维 Cu(2)O/SnO(2) p-n 异质结构多层薄膜，通过在准二维超薄液层中电化学沉积制备。通过在电极上施加特殊的半正弦沉积电势，Cu(2)O 和 SnO(2) 根据其还原电势选择性和周期性地沉积。由于共振隧穿调制，所制备的异质结构薄膜在室温下对 H(2)S 表现出优异的灵敏度。此外，还发现激光照射可以增强气体响应，并且讨论了激光照射的机制。这是关于共振隧穿调制气体传感应用的首次报道。因此，作为共振隧穿系统的异质结构材料被认为是进一步改善室温气体传感的理想候选材料。
