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Detection of Low Humidity Using Three-Dimensional DMC Network Structure.

Lu Yang1, Xiaomin Chen1, Haotian Fan1

  • 1Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, College of Physics & Optoelectronic Engineering, Jinan University, Guangzhou 510632, China.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
Summary

This study developed a novel sensor using DMC/SiO2 composite microspheres for accurate low relative humidity (RH) detection. The sensor demonstrates high sensitivity and rapid response, addressing a key challenge in RH sensing technologies.

Keywords:
low humidity sensingthe DMC/SiO2 composite microspheresthree-dimensional network structure

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Detecting low humidity levels is a significant challenge in current relative humidity (RH) sensing technologies.
  • Existing sensors often struggle with sensitivity and response times at ultra-low RH.

Purpose of the Study:

  • To develop a highly sensitive and rapid sensor for detecting ultra-low humidity levels.
  • To create a novel composite material for enhanced water molecule adsorption and transport.

Main Methods:

  • Coating methacryloxyethyl trimethyl ammonium chloride (DMC) onto SiO2 microspheres to create DMC/SiO2 composite microspheres.
  • Self-assembling the composite microspheres into a three-dimensional (3D) network structure.
  • Evaluating sensor performance in the 1-18.6% RH range.

Main Results:

  • The DMC/SiO2 composite microspheres formed a 3D network structure facilitating water molecule transport.
  • The sensor exhibited a high response of 13,544% in the 1-18.6% RH range.
  • Achieved rapid response (6 s) and recovery (10 s) times with minimal humidity hysteresis (1.4% RH).

Conclusions:

  • The developed sensor effectively detects ultra-low humidity levels due to the hydrophilic DMC component and 3D network structure.
  • The sensor's high performance indicates significant potential for applications in various fields.
  • Potential applications include electricity, semiconductor manufacturing, pure gas supply, aerospace, and pharmaceutical formulations.