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Amino-Functionalization and Enhanced Humidity Sensing Properties of MIL-125 Based on Quartz Crystal Microbalance Sensor
Author NameAffiliationE-mail
WU Yue-Tao College of Material Science and Engineering, Hunan University, Changsha 410082, China  
FAN Yu NEST Lab, Department of Physics, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China  
LIU Yan-Li College of Material Science and Engineering, Hunan University, Changsha 410082, China yanliliu@hnu.edu.cn 
XU Jia-Qiang NEST Lab, Department of Physics, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China xujiaqiang@shu.edu.cn 
Abstract: The metal organic framework compounds MIL-125(Ti) and NH2-MIL-125(Ti) were prepared and chara-cterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR)and specific surface area (BET). The humidity sensing performances of the two materials based QCM sensors were studied by exposed to humidity range of 11%~97%RH (relative humidity). The experimental results show that the MIL-125(Ti) and NH2-MIL-125(Ti) sensors have some advantages, such as high sensitivity, good repeatability, fast response/recovery and etc. Compared with MIL-125(Ti), the sensor modified by NH2-MIL-125(Ti) exhibited higher response to humidity.when the indoor humidity was about 52%, the frequency shift of the NH2-MIL-125(Ti) sensor to a 11% relative humidity was 57 Hz higher than MIL-125(Ti), indicating that the amino-functionalized material had a certain enhancement to the response of the humidity sensor. Furthermore, the adsorption enthalpys between water molecules and MIL-125(Ti) or NH2-MIL-125(Ti) was obtained by Materials Studio, which proved that the amino functionalization could enhance the humidity sensitivity of MIL-125(Ti).
Keywords: metal-organic framework  quartz crystal microbalance  relative humidity  amino-functionalization  humidity sensor
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WU Yue-Tao,FAN Yu,LIU Yan-Li,XU Jia-Qiang.Amino-Functionalization and Enhanced Humidity Sensing Properties of MIL-125 Based on Quartz Crystal Microbalance Sensor[J].Chinese Journal of Inorganic Chemistry,2019,35(4):635-642.
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Chinese Journal of Inorganic Chemistry