Meng Jianping, Li Hu, Zhao Luming, Lu Junfeng, Pan Caofeng, Zhang Yan, Li Zhou
CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, P.R. China.
Beijing Advanced Innovation Centre for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, P.R. China.
Nano Lett. 2020 Jul 8;20(7):4968-4974. doi: 10.1021/acs.nanolett.0c01063. Epub 2020 Jun 24.
Highly sensitive ethanol sensors are important for environmental and industrial monitoring. In our work, we demonstrate a method to enhance the response of a Schottky sensor based on a ZnO nano/microwire (NMW) by triboelectric nanogenerator (TENG). Via lowering the Schottky barrier height (SBH) via the high voltage from TENG, the response of the sensor is enhanced by 139% for 100 ppm ethanol. This method accelerates the recovery process. The high voltage from TENG produces a high intensity electric field to drive diffusion of the oxygen vacancies in ZnO NMW toward to the junction area around the interface. It is equivalent to applying the reverse voltage on the Schottky junction, which leads to the increase of depletion width. More chemisorbed oxygen on the depletion region is consumed once the ethanol gas is injected into the chamber, which improves the response of the ethanol sensor. This study provides a new, simple, and effective method to improve the sensor response.
高灵敏度乙醇传感器对于环境和工业监测至关重要。在我们的工作中，我们展示了一种通过摩擦纳米发电机（TENG）增强基于ZnO纳米/微线（NMW）的肖特基传感器响应的方法。通过TENG产生的高压降低肖特基势垒高度（SBH），对于100 ppm乙醇，传感器的响应提高了139%。该方法加速了恢复过程。TENG产生的高压产生高强度电场，驱动ZnO NMW中的氧空位向界面周围的结区扩散。这相当于在肖特基结上施加反向电压，导致耗尽宽度增加。一旦将乙醇气体注入腔室，耗尽区上更多的化学吸附氧被消耗，从而提高了乙醇传感器的响应。本研究提供了一种新的、简单且有效的方法来提高传感器响应。
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