Cui Heping, Zheng Kai, Xie Zhongjian, Yu Jiabing, Zhu Xiangyi, Ren Hao, Wang Zeping, Zhang Feng, Li Xiandong, Tao Lu-Qi, Zhang Han, Chen Xianping
Key Laboratory of Optoelectronic Technology & Systems, Education Ministry of China, and College of Optoelectronic Engineering, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China.
Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
ACS Appl Mater Interfaces. 2020 Oct 21;12(42):47704-47713. doi: 10.1021/acsami.0c15964. Epub 2020 Oct 5.
Industrial production, environmental monitoring, and clinical medicine put forward urgent demands for high-performance gas sensors. Two-dimensional (2D) materials are regarded as promising gas-sensing materials owing to their large surface-to-volume ratio, high surface activity, and abundant surface-active sites. However, it is still challenging to achieve facilely prepared materials with high sensitivity, fast response, full recovery, and robustness in harsh environments for gas sensing. Here, a combination of experiments and density functional theory (DFT) calculations is performed to explore the application of tellurene in gas sensors. The prepared tellurene nanoflakes via facile liquid-phase exfoliation show an excellent response to NO (25 ppb, 201.8% and 150 ppb, 264.3%) and an ultralow theory detection limit (DL) of 0.214 ppb at room temperature, which is excellent compared to that of most reported 2D materials. Furthermore, tellurene sensors present a fast response (25 ppb, 83 s and 100 ppb, 26 s) and recovery (25 ppb, 458 s and 100 ppb, 290 s). The DFT calculations further clarify the reasons for enhanced electrical conductivity after NO adsorption because of the interfacial electron transfer from tellurene to NO, revealing an underlying explanation for tellurene-based gas sensors. These results indicate that tellurene is eminently promising for detecting NO with superior sensitivity, favorable selectivity, an ultralow DL, fast response-recovery, and high stability.
工业生产、环境监测和临床医学对高性能气体传感器提出了迫切需求。二维（2D）材料因其大的表面体积比、高表面活性和丰富的表面活性位点而被视为有前景的气敏材料。然而，要实现易于制备且在恶劣环境下具有高灵敏度、快速响应、完全恢复和稳健性的气敏材料仍然具有挑战性。在此，通过实验和密度泛函理论（DFT）计算相结合的方法来探索碲烯在气体传感器中的应用。通过简便的液相剥离法制备的碲烯纳米片在室温下对NO表现出优异的响应（25 ppb时为201.8%，150 ppb时为264.3%）以及0.214 ppb的超低理论检测限，与大多数已报道的二维材料相比表现出色。此外，碲烯传感器具有快速响应（25 ppb时为83 s，100 ppb时为26 s）和恢复（25 ppb时为458 s，100 ppb时为290 s）。DFT计算进一步阐明了NO吸附后电导率增强的原因，即由于从碲烯到NO的界面电子转移，揭示了基于碲烯的气体传感器的潜在解释。这些结果表明，碲烯在检测NO方面具有卓越的灵敏度、良好的选择性、超低检测限、快速响应恢复以及高稳定性，极具应用前景。
