聚二甲基硅氧烷
材料科学
选择性
丙酮
膜
化学工程
聚合物
分子
惰性气体
涂层
纳米棒
纳米颗粒
气体分离
纳米技术
有机化学
复合材料
化学
催化作用
工程类
生物化学
作者
Tingting Zhou,Wenbo Dong,Yue Qiu,Shiyu Chen,Xiaoxia Wang,Changsheng Xie,Dawen Zeng
标识
DOI:10.1021/acsami.1c16637
摘要
It is important for noninvasive diagnosis of diabetes to develop acetone gas sensors with high selectivity. ZnO@ZIF-71 has been reported as a highly sensitive and selective gas sensor on acetone detection. However, it is difficult to exclude the interference with similar molecular sizes gas in the gas-sensing process, like ethanol. To solve this problem, polydimethylsiloxane (PDMS) was synthesized on the surface of ZnO@ZIF-71 to form a ZnO@ZIF-71@PDMS sensor by vapor deposition. The new sensor shows inert response to ethanol and effective response to acetone simultaneously. The PDMS membrane acts as a molecular sieve, which shows the acetone selectivity performance and can totally eliminate the response to low concentration ethanol at low temperature. Theory calculations and solubility test are also employed to prove the role PDMS plays in this process. It demonstrated that the acetone selectivity performance comes from the hydrogen bond interaction between the ethanol gas molecules and PDMS, which increases difficulty for ethanol gas molecules to penetrate the PDMS membrane. Further, this work provides a new method for enhancing gas-sensing selectivity and promoting for miniaturization of gas sensors.
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