A Humidity‐Induced Large Electronic Conductivity Change of 107 on a Metal‐Organic Framework for Highly Sensitive Water Detection

Author:

Deng Wei‐Hua12,Li Qiao‐Hong1,Chen Jie1,Wang Chuan‐Zhe1,Fu Zhi‐Hua1,Ye Xiao‐Liang1,Wang Guan‐E1,Xu Gang134ORCID

Affiliation:

1. State Key Laboratory of Structural Chemistry Fujian Provincial Key Laboratory of Materials and Techniques toward Hydrogen Energy Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

2. Fujian Provincial Key Laboratory of Polymer Materials College of Chemistry and Materials Science Fujian Normal University <350117 Fuzhou China

3. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China

4. University of Chinese Academy of Sciences Beijing 100049 China

Abstract

AbstractThe electronic conductivity (EC) of metal–organic frameworks (MOFs) is sensitive to strongly oxidizing guest molecules. Water is a relatively mild species, however, the effect of H2O on the EC of MOFs is rarely reported. We explored the effect of H2O on the EC in the MOFs (NH2)2‐MIL‐125 and its derivatives with experimental and theoretical investigations. Unexpectedly, a large EC increase of 107 on H2SO4@(NH2)2‐MIL‐125 by H2O was observed. Brønsted acid–base pairs formed with the −NH2 groups, and H2SO4 played an important role in promoting the charge transfer from H2O to the MOF. Based on H2SO4@(NH2)2‐MIL‐125, a high‐performance chemiresistive humidity sensor was developed with the highest sensitivity, broadest detection range, and lowest limit of detection amongst all reported sensing materials to date. This work not only demonstrated that H2O can remarkably influence the EC of MOFs, but it also revealed that post‐modification of the structure of MOFs could enhance the influence of the guest molecule on their EC to design high‐performance sensing materials.

Funder

National Natural Science Foundation of China

National Key Scientific Instrument and Equipment Development Projects of China

Publisher

Wiley

Subject

General Chemistry,Catalysis

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