Humidity sensor based on solution processible microporous silica nanoparticles
Humidity sensor based on solution processible microporous silica nanoparticles
复制标题
基于可溶液加工的微孔二氧化硅纳米颗粒的湿度传感器
DOI：
10.1016/j.snb.2018.03.052
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发表时间：
2018-08
期刊：
影响因子：
--
通讯作者：
Lu Geyu
中科院分区：
文献类型：
--
作者：
Zhao Hongran;Zhang Tong;Qi Rongrong;Dai Jianxun;Liu Sen;Fei Teng;Lu Geyu
由介孔二氧化硅负载亲水性元素制备的复合材料作为湿敏材料得到了广泛的研究。亲水性元素负载的物理混合过程难以保证复合材料的均匀性和结构稳定性。此外，二氧化硅骨架的差的结晶性限制了其溶液可加工性。本文中，通过巯基官能化的微孔二氧化硅纳米颗粒（MSN）与亲水性烯基单体之间的硫醇-烯点击反应合成可溶液加工的有机-无机杂化材料。最佳杂化材料粒径小（约105 nm），且具有亲水性，在50 mg/mL浓度下可稳定分散于水中。采用溶液法制备了湿敏元件，并对其湿敏特性进行了研究。该传感器在11%~ 95%RH的湿度范围内具有高的灵敏度（约3个数量级的阻抗模量变化）、小的滞后（± 2%RH）和快速的响应（响应和恢复时间分别为5和40 s）。
Composites fabricated by mesoporous silica loading hydrophilic elements have been widely investigated as humidity sensitive materials. The physical mixing process for loading hydrophilic elements is difficult to guarantee the uniformity and structural stability of the composites. Furthermore, the poor dispersibility of the silica skeleton restricts its solution processability. Herein, solution processible organic-inorganic hybrid materials were synthesized via a thiol-ene click reaction between sulfhydryl functionalized microporous silica nanoparticles (MSNs) and hydrophilic alkenyl monomer. The optimal hybrid material could disperse in water stably with a concentration of 50 mg/mL owing to the small particle size (about 105 nm) and the hydrophilic characteristic. Humidity sensors were fabricated by solution process and the humidity sensing properties were investigated. The sensor exhibits high sensitivity (about three orders impedance modulus change), small hysteresis (∼2% RH) and rapid response (the response and recovery time are 5 and 40 s, respectively) in the humidity range of 11%–95% RH.
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