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Updated: May 22, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
Ion Concentration Gradient Induced Efficient Ion Migration in Hydrogen-Bonded Organic Frameworks for
Wangze Cheng1, Can Xu1, Qixiang Zhang2
1Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Industry-Education-Research Institute of Advanced Materials and Technology for Integrated Circuits, Anhui University, Hefei, 230601, China.
Abstract:
As one of the driving forces of ion migration, ion concentration gradients have large untapped potential to improve the performance of humidity sensors. A self-powered flexible humidity sensor based on hydrogen-bonded organic framework electrolytes wherein Na+ concentration gradients induce efficient ion migration is presented that can be attributed to the reversible effect of ambient water molecules on the migration barrier of Na+. The sensor exhibits superior flexibility, rapid responsiveness, high sensitivity (0.17 µA/% relative humidity), rapid response time (1.06 s), and outstanding stability (>200 cycles). The humidity-responsive device based on the Na+ concentration gradient exhibited excellent self-powering capability, eliminating the need for an external power unit and demonstrating impressive humidity power generation potential, which achieves a high current density of up to 164 mA m-2 and power density of 5.625 mW m-2. This research presents a new paradigm for developing self-powered humidity sensors and demonstrates their exceptional performance in noncontact sensing applications.
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