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Updated: Mar 2, 2026

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
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Colorimetric Humidity Sensors Based on Electrospun Polyamide/CoCl2 Nanofibrous Membranes.

Ming-Hao You1, Xu Yan2,3, Jun Zhang1

  • 1Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao, 266071, China.

Nanoscale Research Letters
|May 24, 2017
PubMed
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New humidity indicators using polyamide 66/cobalt chloride nanofibrous membranes (NFMs) offer visual color changes and quartz crystal microbalance (QCM) detection for accurate relative humidity (RH) monitoring.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Developing advanced humidity indicators is crucial for various environmental and industrial applications.
  • Polyamide 66 (PA66) and cobalt chloride (CoCl2) are known for their responsive properties.

Purpose of the Study:

  • To fabricate and characterize humidity indicators based on PA66/CoCl2 nanofibrous membranes (NFMs).
  • To evaluate the humidity sensitivity using both visual color change and quartz crystal microbalance (QCM) methods.

Main Methods:

  • Electrospinning was employed to create PA66/CoCl2 composite NFMs with varying CoCl2 concentrations.
  • Humidity sensitivity was assessed by observing macroscopic color changes and utilizing QCM detection across a range of relative humidity (RH).
Keywords:
Colorimetric humidity sensorElectrospinningPA66/CoCl2 nanofibrous membranes

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Main Results:

  • The composite NFMs exhibited a distinct color transition from blue to pink as RH increased from 12.4% to 97.2%.
  • QCM analysis revealed a linear response to RH changes with rapid response/recovery times (<65.4 s/<11 s), minimal hysteresis (<11%), and excellent stability and reproducibility.

Conclusions:

  • The PA66/CoCl2 composite NFMs demonstrate a dual sensing mechanism for RH monitoring.
  • These materials show significant potential for applications requiring precise humidity detection.