Flexible and Transparent Cellulose Based Ionic Film as Humidity Sensor.
Flexible and Transparent Cellulose Based Ionic Film as Humidity Sensor.
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DOI：
10.1021/acsami.9b22754
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发表时间：
2020-01
影响因子：
9.5
通讯作者：
Yang Wang;Lina Zhang;Jinping Zhou;A. Lu
中科院分区：
文献类型：
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作者：
Yang Wang;Lina Zhang;Jinping Zhou;A. Lu
制备了一种透明、柔软的纤维素/氢氧化钾复合离子膜(CKF)作为湿敏元件。CKF具有较高的光学透过率(在550 nm处为87.14%)，这在湿度传感器中是罕见的，这是由于水分蒸发导致的纤维素基质的小孔径致密堆积以及通过简单的浸泡干燥而形成的无定形KOH的均匀分布。CKF还具有柔韧性和坚固的机械性能。该电导CKF在11.3~97.3RH%范围内对相对湿度(RH)具有快速、可逆的实时响应，电导变化超过200次，响应/恢复时间为6/10.8 S，比大多数文献报道的值都要短，滞后误差为0.57%，明显小于文献报道的结果。此外，CKF对温度(10~70℃)和压力(0~120kPa)都不敏感，作为湿度传感器具有很高的选择性。在非接触式指尖水分检测和呼吸频率检测中，灵活透明的CKF湿度传感器对相对湿度变化具有良好的响应能力。此外，还组装了一种基于CKF的灵活透明的可穿戴皮肤水分检测仪，用于测量不同情况下人体皮肤的水分，其测量结果与商用检测仪非常接近。实验结果提供了人体皮肤的实时水分信息，显示了基于CKF的水分检测器作为集成智能可穿戴设备的一种有前途的模块化组件的潜力。
A transparent and flexible cellulose/KOH composite ionic film (CKF) is fabricated as humidity sensor. CKF exhibits high optical transmittance (87.14 % at 550 nm), which has rarely been reported among humidity sensors, due to the small pore size of cellulose matrix caused by water evaporation induced dense packing and uniform distribution of amorphous KOH via simply soaking-drying. CKF also possesses flexibility and robust mechanical property. The conductive CKF shows fast and reversible real time response to relative humidity (RH) in the 11.3~97.3 RH% range with conductance varies over 200 times, response/recovery times of 6.0/10.8 s which are shorter than majority of the reported values, as well as hysteresis error of 0.57 % which is significantly less than literatures. Furthermore, CKF is insensitive to both temperature (10~70 °C) and pressure (0~120 kPa), indicating high selectivity as humidity sensors. In both the noncontact fingertip moisture detection and breathing rate detection, the flexible and transparent CKF-based humidity sensor responds favorably to RH change. Moreover, a flexible and transparent CKF-based wearable skin moisture detector is assembled to measure the moisture of human skin in different situations, whose measurement is very close to the commercial detector. The results offer real-time moisture information of human skin, and demonstrate the potential of CKF-based moisture detector as a promising modular component in integrated intelligent wearable equipment.