Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, PR China.
Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, PR China.
Biosens Bioelectron. 2024 Aug 1;257:116296. doi: 10.1016/j.bios.2024.116296. Epub 2024 Apr 16.
Breathing is an important physiological activity of human body, which not only reflects the state of human movement, but also is one of the important health indicators. Breathing can change the concentration of water molecules, so monitoring humidity has gradually become a hot topic in modern research. In this study, a humidity sensing composite film with high sensitivity and short response time was made by using the mixture of graphene oxide (GO) and bacterial cellulose (BC) with simple dry film-forming method. L-ascorbic acid was used as reducing agent to reduce GO and improve the conductivity of GO/BC composite film (BG). The influence of different BC contents and the different reduction degree on the resistance change rate of composite film was investigated in details. The maximum resistance change rate of partially reduced BG humidity sensitive composite film reached up to 94%, and the response and recovery time were 13 s and 47 s respectively. Furthermore, the sensor shows obvious resistance change in noncontact sensing test and different breathing states. This kind of humidity sensitive film with fast response and high sensitivity has great potential in human health monitoring and noncontact sensing, and is of great significance in promoting health detection and intelligent life.
呼吸是人体的一项重要生理活动，它不仅反映人体的运动状态，还是重要的健康指标之一。呼吸可以改变水分子的浓度，因此湿度监测逐渐成为现代研究的热点。本研究采用氧化石墨烯（GO）和细菌纤维素（BC）的混合物，通过简单的干法成膜制备出一种具有高灵敏度和短响应时间的湿度传感复合膜。以抗坏血酸作为还原剂还原 GO，提高 GO/BC 复合膜（BG）的电导率。详细研究了不同 BC 含量和不同还原程度对复合膜电阻变化率的影响。部分还原 BG 湿度敏感复合膜的最大电阻变化率达到 94%，响应和恢复时间分别为 13s 和 47s。此外，该传感器在非接触式传感测试和不同呼吸状态下均表现出明显的电阻变化。这种具有快速响应和高灵敏度的湿度敏感膜在人体健康监测和非接触式传感方面具有巨大的潜力，对促进健康检测和智能生活具有重要意义。
