Highly stable and sensitive humidity sensors based on quartz crystal microbalance coated with bacterial cellulose membrane |
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| Authors: | Weili HuAuthor VitaeShiyan ChenAuthor Vitae Bihui ZhouAuthor VitaeLuting LiuAuthor Vitae Bin DingAuthor Vitae Huaping WangAuthor Vitae |
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| Affiliation: | a State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, The Key Laboratory of High-Performance Fiber and Product, Ministry of Education, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
b Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China |
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| Abstract: | A novel highly stable and sensitive humidity sensor based on bacterial cellulose (BC) coated quartz crystal microbalance (QCM) has been successfully fabricated. The results showed that the sensors possessed good sensing characteristics by increasing more than two orders of magnitude with increasing relative humidity (RH) from 5 to 97%, and the Log(Δf) showed good linearity (20-97% RH). The sensitivity of sensors coated with BC membranes was four times higher than that of the corresponding cellulose membranes at 97% RH. In addition, the sensor sensitivity is greatly enhanced by increasing the coating load of the BC membranes with more absorption sites in the sensing membranes. Moreover, the experimental results prove that the resultant sensors exhibited a good reversible behavior and good long term stability. Herein, not only a novel and low-cost humidity sensor material was exploited, but also a new application area for BC nanofibrous membranes was opened up. |
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| Keywords: | Bacterial cellulose Nanofibrous membrane Quartz crystal microbalance Humidity sensors |
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