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Saturated Salt Hydrogel Engineering for Tunable ZnO Ultraviolet Sensor Performance and Mitigated Humidity

Yunfu Cui1, Li Cheng1, Bolang Cheng2

  • 1School of Materials and Energy, Lanzhou University, Lanzhou, Gansu 730000, China.

ACS Applied Materials & Interfaces
|January 9, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals how humidity can enhance zinc oxide (ZnO) ultraviolet (UV) sensors. A novel hydrogel-modulated sensor overcomes humidity interference, improving UV detection reliability and performance.

Keywords:
ZnO UV sensorscompetitive adsorptionhumidity engineeringperformance regulationsaturated salt hydrogels

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Humidity typically degrades zinc oxide (ZnO) ultraviolet (UV) sensor performance by interfering with oxygen adsorption.
  • This interference compromises the reliability of UV detection in environmental monitoring applications.

Purpose of the Study:

  • To investigate the competitive adsorption mechanisms of water (H2O) and oxygen (O2) on ZnO surfaces.
  • To develop a novel ZnO UV sensor that utilizes humidity as a performance-regulating factor, overcoming its detrimental effects.

Main Methods:

  • Systematic elucidation of competitive adsorption mechanisms between H2O and O2.
  • Development of a saturated salt hydrogel-modulated ZnO UV sensor (SSHM-ZnO-UVS).
  • Evaluation of sensor performance under varying relative humidity levels (15% to 89%).

Main Results:

  • The SSHM-ZnO-UVS demonstrated suppressed humidity-dependent photoresponse, with limited fluctuations in response, response time, and recovery time (1.09%, 4.36%, 4.36%).
  • The sensor enabled tunable trade-offs between response speed and sensitivity.
  • Achieved ultrafast operation (1.8 s response, 1.4 s recovery) or high sensitivity (on/off ratio of 1.6 × 10^4).

Conclusions:

  • Humidity can be engineered as a functional regulator to enhance ZnO UV sensor performance.
  • The developed SSHM-ZnO-UVS strategy offers a generalizable approach for improving UV sensor reliability and tunability.
  • This research transforms a known limitation into an advantage for advanced UV sensing applications.