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An AlFFIVE-1-Ni-Based Humidity Sensor with Fast Response-Recovery Speed
Wenxiang Zhang1, Yatong Ren2,3, Peng Wang3
1State Key Laboratory of Fluorine & Nitrogen Chemicals, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 18, 2026
Summary
A novel metal-organic framework, AlFFIVE-1-Ni, was used to create a high-performance humidity sensor. This sensor demonstrates exceptional sensitivity, rapid response, and stability for accurate relative humidity monitoring.
Area of Science:
- Materials Science
- Chemical Engineering
- Sensor Technology
Background:
- Porous materials are crucial for humidity sensors, offering unique advantages for relative humidity (RH) monitoring.
- Developing advanced materials with enhanced properties is key to improving sensor performance.
Purpose of the Study:
- To fabricate a high-performance resistance-type humidity sensor using a novel metal-organic framework (MOF), AlFFIVE-1-Ni.
- To investigate the sensing properties and underlying mechanisms of the AlFFIVE-1-Ni-based humidity sensor.
Main Methods:
- Fabrication of a resistance-type humidity sensor using AlFFIVE-1-Ni.
- Systematic characterization of the sensor's response to varying relative humidity levels.
- Analysis of sensing mechanisms using complex impedance curve (CIC), equivalent circuit (EC) analysis, density functional theory (DFT), and Grand Canonical Monte Carlo (GCMC) simulations.
Main Results:
- The AlFFIVE-1-Ni sensor exhibited a significant change in impedance modulus (>2 orders of magnitude) across a wide RH range (11-95%).
- The sensor demonstrated a good linear correlation between impedance modulus and RH above 33% RH.
- Achieved rapid response (6 s) and recovery (3 s) times, low hysteresis (3% RH), and excellent long-term stability.
Conclusions:
- The unique structural features of AlFFIVE-1-Ni, including its ordered pores, fluorine atoms, and open metal sites, contribute to its excellent hydrophilicity and stability.
- The AlFFIVE-1-Ni-based humidity sensor shows great potential for highly sensitive and rapid RH detection applications.
