Niu Gaoqiang, Zhao Changhui, Gong Huimin, Yang Zhitao, Leng Xiaohui, Wang Fei
School of Microelectronics, Southern University of Science and Technology, Shenzhen, 518055 China.
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055 China.
Microsyst Nanoeng. 2019 May 20;5:21. doi: 10.1038/s41378-019-0060-7. eCollection 2019.
In a high relative humidity (RH) environment, it is challenging for ethanol sensors to maintain a high response and excellent selectivity. Herein, tetragonal rutile SnO nanosheets decorated with NiO nanoparticles were synthesized by a two-step hydrothermal process. The NiO-decorated SnO nanosheet-based sensors displayed a significantly improved sensitivity and excellent selectivity to ethanol gas. For example, the 3 mol% NiO-decorated SnO (SnO-3Ni) sensor reached its highest response (153 at 100 ppm) at an operating temperature of 260 °C. Moreover, the SnO-3Ni sensor had substantially improved moisture resistance. The excellent properties of the sensors can be attributed to the uniform dispersion of the NiO nanoparticles on the surface of the SnO nanosheets and the formation of NiO-SnO p-n heterojunctions. Considering the long-term stability and reproducibility of these sensors, our study suggests that the NiO nanoparticle-decorated SnO nanosheets are a promising material for highly efficient detection of ethanol.
在高相对湿度（RH）环境中，乙醇传感器要保持高响应性和出色的选择性具有挑战性。在此，通过两步水热法合成了用NiO纳米颗粒修饰的四方金红石型SnO纳米片。基于NiO修饰的SnO纳米片的传感器对乙醇气体表现出显著提高的灵敏度和出色的选择性。例如，3 mol% NiO修饰的SnO（SnO-3Ni）传感器在260°C的工作温度下达到其最高响应（100 ppm时为153）。此外，SnO-3Ni传感器的防潮性有了显著改善。传感器的优异性能可归因于NiO纳米颗粒在SnO纳米片表面的均匀分散以及NiO-SnO p-n异质结的形成。考虑到这些传感器的长期稳定性和可重复性，我们的研究表明，用NiO纳米颗粒修饰的SnO纳米片是用于高效检测乙醇的有前途的材料。
