We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A Highly Stable Two‐Dimensional Copper(II) Organic Framework for Proton Conduction and Ammonia Impedance Sensing.
- Authors
Sun, Zhibing; Yu, Shihang; Zhao, Lili; Wang, Jifeng; Li, Zifeng; Li, Gang
- Abstract
Abstract: This work reports the design and fabrication of a proton conductive 2D metal–organic framework (MOF), [Cu(p‐IPhHIDC)]n (1) (p‐IPhH3IDC=2‐(p‐N‐imidazol‐1‐yl)‐phenyl‐1 H‐imidazole‐4,5‐dicarboxylic acid) as an advanced ammonia impedance sensor at room temperature and 68–98 % relative humidity (RH). MOF 1 shows the optimized proton conductivity value of 1.51×10−3 S cm−1 at 100 °C and 98 % RH. Its temperature‐dependent and humidity‐dependent proton conduction properties have been explored. The large amount of uncoordinated carboxylate groups between the layers plays a vital role in the resultant conductivity. Distinctly, the fabricated MOF‐based sensor displays the required stability toward NH3, enhanced sensitivity, and notable selectivity for NH3 gas. At room temperature and 68 % RH, it gives a remarkable gas response of 8620 % to 130 ppm NH3 gas and lower detection limit of 2 ppm towards NH3 gas. It is also found that the gas response of the ammonia sensor increases linearly with the increase of NH3 gas concentration under 68–98 % RH and room temperature. Moreover, the sensor indicates excellent reversibility and selectivity toward NH3 versus N2, H2, O2, CO, CO2, benzene, and MeOH. Based on structural analyses, activation energy calculations, water and NH3 vapor absorptions, and PXRD determinations, proton conduction and NH3 sensing mechanisms are suggested.
- Publication
Chemistry - A European Journal, 2018, Vol 24, Issue 42, p10829
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201801844