Preparation and Characterization of Titanium Dioxide/Nanocellulose Composites Film for Wearable Gas Sensor

被引：0
作者：
Zhou J. [1 ]
Tong X. [1 ,2 ,3 ]
Shen W. [1 ]
机构：
[1] State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou
[2] Key Laboratory of Recycling and Eco-Treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou
[3] State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2020年 / 36卷 / 03期
关键词：
Composite enzymatic hydrolysis; Nanocrystalline cellulose film; Physical properties; Titanium dioxide;
D O I：
10.16865/j.cnki.1000-7555.2020.0018
中图分类号：
学科分类号：
摘要：
Using eucalyptus pulp as raw material, a composite enzyme composed of cellulase and xylanase (enzyme concentration ratio of 9:1) with the total enzyme concentration of 10 U/mL was used to prepare nanocrystalline cellulose (NCC). The NCCs with the average length of 625 nm and diameter of 50 nm were obtained under the composite enzymatic hydrolysis for 12 h at 50℃. Subsequently, the transparent NCC film was obtained by the vacuum filtration method using the prepared NCC as raw material. The obtained performance indexes of the NCC film were as follows: the elastic modulus is 8178 MPa, tensile stress is 33 MPa, the transmittance is 90.86%, and the strain at break is 99%, indicating that the NCC film has good mechanical properties and transmittance. Furthermore, the NCC was mixed with the gas-sensing nano-titanium dioxide (TiO2) colloid, and the TiO2/NCC composite film was obtained by the vacuum filtration method. The study results show that the TiO2/NCC composite films with the small addition of TiO2 (TiO2 content of 1%, 2% and 4%) still have good transmittance (greater than 90%) and physical properties (elastic modulus of 4906 MPa, tensile strength of 37 MPa, elongation at break of 45%). Moreover, the TiO2/NCC composite film has a gas-sensitive response to ammonia gas at room temperature, as well as good selectivity and stability. These results lay a solid foundation for the future research on wearable gas sensors based on developed TiO2/NCC composite films. © 2020, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：149 / 157
页数：8
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