拟用于可穿戴气敏传感器的二氧化钛/纳米纤维素复合膜制备及表征  

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

作　　者：周静[1] 童欣[1,2,3] 沈文浩 Jing Zhou;Xin Tong;Wenhao Shen(State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China;Key Laboratory of Recycling and Eco-Treatment of Waste Biomass of Zhejiang Province,Zhejiang University of Science and Technology,Hangzhou 310023,China;State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640 [2]浙江科技学院浙江省废弃生物质循环利用与生态处理技术重点实验室,浙江杭州310023 [3]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《高分子材料科学与工程》2020年第3期149-157,共9页Polymer Materials Science & Engineering

基　　金：广州市科技计划项目(201904010423);广东省自然科学基金资助项目(2016A030313478);电子薄膜与集成器件国家重点实验室开放课题(KFJJ201803)。

摘　　要：使用纤维素酶和木聚糖酶(酶活比9:1)组成总酶活为10U/mL的复合酶液,以桉木浆为原料在50℃水解12h,获得平均长度约625nm、平均直径50nm的棒状纳米晶纤维素(NCC)。以所制备的NCC为原料,采用真空抽滤法获得了透明柔性NCC膜,其弹性模量为8178MPa,抗张强度为33MPa,透光度为90.86%,裂断应变为99%,表明NCC膜具有良好的力学性能和透光性,可用作柔性器件的基底材料。然后,进一步在NCC中加入气敏材料纳米二氧化钛(TiO2)胶体,采用真空抽滤法获得了TiO2/NCC复合膜。研究结果表明,添加少量TiO2(1%、2%、4%)的TiO2/NCC复合膜依然具有良好的透光度(90%以上)与物理性能(弹性模量4906MPa、抗张强度37MPa、裂断应变45%)。在室温下,TiO2/NCC复合膜对氨气具有气敏响应,以及良好的选择性和稳定性。这些研究结果为制备高性能的TiO2/NCC可穿戴气敏传感器的进一步研究奠定了良好基础。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 10U/mL was used to prepare nanocrystalline cellulose(NCC).The NCCs with the average length of 625nm and diameter of 50nm were obtained under the composite enzymatic hydrolysis for 12hat 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 8178MPa,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(TiO2content of 1%,2% and 4%)still have good transmittance(greater than 90%)and physical properties(elastic modulus of 4906MPa,tensile strength of 37MPa,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.

关 键 词：复合酶解法 纳米晶纤维素膜 二氧化钛 物理性能 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]