Xia Pengfei, Shou Qian, Wang Tianci, Yang Guanjie, Li Heng, Li Qiuhua, Chen Yongxiao, Xie Tian, Huang Jianlin, Xing Xiaobo
Opt Lett. 2022 Jun 1;47(11):2674-2677. doi: 10.1364/OL.460950.
Fluorescent sensors are resistant to electromagnetic interference and are electrically insulated, allowing for highly accurate measurements. Quantum dots (QDs) serve as outstanding sensing materials owing to the unique optical properties such as tunable photoluminescence (PL), excellent visible light activity, and high chemical and physical stability. In this paper, we develop an optical humidity sensor based on a QDs nanocomposite film. The film is made of polyvinyl alcohol (PVA), SiO microsphere (SM), and QDs through the layer-by-layer self-assembly method. The mechanism of humidity detection is moisture-induced quenching of the QDs fluorescence intensity. The results reveal that our sensor shows a good linear response to relative humidity in the range of 5% to 97%, a fast response-recovery time of 25 s and 20 s, and good repeatability for more than 50 cycles as well as high stability for over 180 days. Possessing the remarkable property, optical humidity sensors are envisaged for great potential applications in environmental monitoring.
荧光传感器抗电磁干扰且电绝缘，可实现高精度测量。量子点（QDs）因其独特的光学性质，如可调谐光致发光（PL）、优异的可见光活性以及高化学和物理稳定性，而成为出色的传感材料。在本文中，我们开发了一种基于量子点纳米复合膜的光学湿度传感器。该膜由聚乙烯醇（PVA）、SiO微球（SM）和量子点通过层层自组装法制成。湿度检测的机制是水分引起的量子点荧光强度猝灭。结果表明，我们的传感器在5%至97%的相对湿度范围内表现出良好的线性响应，响应-恢复时间分别为25秒和20秒，在50多个循环中具有良好的重复性，以及在超过180天的时间里具有高稳定性。由于具有这些卓越性能，光学湿度传感器在环境监测中具有巨大的潜在应用前景。
