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Visible Light-Driven Heterojunction Array Based on Type-I In2S3/In2O3 for Selective Multi-Gas Discrimination.

Gi Baek Nam1, Jaekwon Ko2,3, Seungwook Choi1,4,5

  • 1Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|November 19, 2025
PubMed
Summary

This study introduces a novel visible light-driven gas sensor using In2S3/In2O3 heterostructures. This advancement significantly enhances NO2 detection sensitivity and enables selective sensing of multiple gases at room temperature.

Keywords:
arraychemoresistive gas sensorheterojunctionindium sulfidelight activation

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Visible light-activated chemoresistive gas sensors offer low power consumption and room temperature operation.
  • Challenges include slow recovery, reduced sensitivity to NO2, and difficulty detecting VOCs and amines under visible light.

Purpose of the Study:

  • To develop a visible light-driven gas sensor array with enhanced performance.
  • To achieve selective detection of multiple gases using a novel heterostructure.

Main Methods:

  • Fabrication of a type-I In2S3/In2O3 heterostructure by depositing In2S3 on In2O3 nanorods.
  • Utilizing blue light illumination to drive the gas sensing mechanism.
  • Decorating the heterostructure with noble metals (Pd, Pt, Au) for enhanced selectivity.

Main Results:

  • The In2S3/In2O3 heterostructure exhibited a 56-fold increase in NO2 response compared to pristine In2O3.
  • The sensor demonstrated excellent selectivity, reliability, and humidity stability for NO2 detection.
  • Noble metal decoration enabled selective detection of NO2, NH3, C2H5OH, and H2.

Conclusions:

  • The type-I In2S3/In2O3 heterostructure effectively enhances visible light-driven gas sensing.
  • This approach offers a new strategy for optimizing light-activated gas sensors and advancing electronic nose technologies.