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Multiscale Humidity Visualization by Environmentally Sensitive Fluorescent Molecular Rotors.

Yanhua Cheng1,2, Jianguo Wang1,2, Zijie Qiu1,2

  • 1Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute of Molecular Functional Materials, State Key Laboratory of Nanoscience, Division of Biomedical Engineering and Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Advanced Materials (Deerfield Beach, Fla.)
|October 19, 2017
PubMed
Summary
This summary is machine-generated.

New fluorescent humidity sensors use aggregation-induced-emission (AIE) molecules to visualize relative humidity (RH) changes with color. These versatile sensors offer high performance for electronics and wearable monitoring.

Keywords:
aggregation-induced emissionfluorescent sensorshumidity visualizationmolecular rotors

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Developing advanced humidity sensors is crucial for integrated electronics and wearable systems.
  • Existing sensors often lack compatibility with diverse configurations and spatial-temporal gradient measurement capabilities.
  • There is a need for novel sensing strategies that provide visual and quantitative humidity information.

Purpose of the Study:

  • To develop a visual humidity sensing approach using aggregation-induced-emission (AIE)-active molecular rotors.
  • To create humidity sensors compatible with diverse applications and tunable geometries.
  • To transform relative humidity (RH) information into visible fluorescence colors for direct observation.

Main Methods:

  • Assembling AIE-active molecular rotors into a moisture-captured network.
  • Utilizing the twisted intramolecular charge-transfer effect for fluorescence color changes.
  • Developing a fluorescent imaging approach for visual humidity detection.

Main Results:

  • The developed AIE humidity sensors exhibit tunable geometries and desirable architectures.
  • Relative humidity (RH) is accurately quantified by observing fluorescence color changes.
  • Sensors demonstrate high sensitivity, spatial-temporal resolution, and fast response/recovery times.
  • Successful multiscale applications including environmental RH detection, internal humidity mapping, and human-body sensing were shown.

Conclusions:

  • A novel visual humidity sensing strategy based on AIE molecular rotors has been successfully developed.
  • The AIE humidity sensors offer excellent performance and compatibility for various applications.
  • This approach provides a new insight for developing advanced humidity sensors for diverse fields.