Carbon nanodot-based humidity sensor for self-powered respiratory monitoring. (October 2022)

• Record Type: Journal Article
• Authors: Qin, Jinxu; Yang, Xigui; Shen, Chenglong; Chang, Yu; Deng, Yuan; Zhang, Zhenfeng; Liu, Hang; Lv, Chaofan; Li, Yizhe; Zhang, Chuang; Dong, Lin; Shan, ChongXin
• Is Part Of: Nano energy. Volume 101(2022)
• Publication Date: 2022-10
• Subjects: Carbon nanodot -- Humidity sensor -- Triboelectric nanogenerator -- Self-powered device -- Respiratory monitoring; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.107549
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Developing low-cost, portable, and high-performance humidity sensors for respiratory monitoring has received considerable attention in recent years. Herein, humidity sensors have been fabricated based on carbon nanodots (CDs), which exhibit high sensitivity (5318%) at 94% relative humidity (RH) and excellent long-time stability under the RH range of 11% to 94%. The high sensitivity can be attributed to the adsorption of the water molecules by the massive hydrophilic functional groups on the surface of CDs. By introducing a breath-driven triboelectric nanogenerator (TENG), the self-powered humidity sensor is developed for the first time, exhibiting a wide sensing range (11–94% RH) and excellent stability. The maximum output voltage of the TENG is up to 200 V and the maximum short-circuit current is about 9.2 μA. Furthermore, the self-powered humidity sensor further demonstrates the potential ability for real-time respiration monitoring, which can detect different breathing statuses. This work provides a convenient and low-cost strategy for constructing sensitive CDs-based humidity sensors, and prospects their applications in respiratory monitoring systems. Graphical Abstract: Humidity sensors have been fabricated based on carbon nanodots, which exhibit a high response (5318%) at 94% relative humidity (RH), and excellent long-time stability in the RH range of 11–94%. By introducing the breath-driven triboelectric nanogenerators, self-powered humidity sensors are developed for real-time respiration monitoring to detect variant breathing modes. ga1 Highlights: A low-cost and simple structured carbon nanodot-based humidity sensor was fabricated. Excellent humidity sensing properties and long-time stability achieved in a wide RH range. Self-powered triboelectric humidity sensor was proposed by integrating the triboelectric nanogenerator. The TENG-driven humidity sensor can detect variant breathing modes in real-time.