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Updated: Apr 11, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

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Published on: January 29, 2013

Optically Programmable Smart WSe₂/hBN Heterostructure Gas Sensors.

Ayaz Ali^1,2, Prashant Bisht^3,4, Matthias Schrade⁵

¹Department of Cybernetics, Nanotechnology and Data Processing, Faculty of Automation Control, Electronics and Computer Science, Silesian University of Technology, Akademicka 16, 44-100 Gliwice, Poland.

ACS Applied Materials & Interfaces

|August 12, 2025

Summary

We developed a highly sensitive, energy-efficient gas sensor using a WSe2/hBN heterostructure for nitrogen oxide (NOx) detection. Optoelectronic control enhances its performance for real-time environmental monitoring.

Keywords:

field-effect transistor (FET)gas sensor heterostructures kelvin probe force microscopy (KPFM)two-dimensional materials

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Area of Science:

Materials Science
Nanotechnology
Sensor Technology

Background:

Highly sensitive and energy-efficient gas sensors are crucial for environmental monitoring and air quality assessment.
Existing sensors often face limitations in performance, response time, or energy efficiency.

Purpose of the Study:

To develop an optically programmable gas sensor for nitrogen oxide (NOx) detection using a WSe2/hBN heterostructure.
To investigate the sensing mechanism and demonstrate tunable control over sensor response.

Main Methods:

Fabrication of WSe2/hBN heterostructure transistors.
In situ Kelvin probe force microscopy (KPFM) for mechanism investigation.
UV-induced optoelectronic modulation for dynamic control.

Main Results:

The WSe2/hBN sensor exhibited enhanced sensitivity and faster recovery compared to WSe2/SiO2 devices.
NOx adsorption was found to modulate the Schottky barrier height (SBH) at the metal/semiconductor interface.
UV light enabled tunable and reversible control of the sensor's response.

Conclusions:

Heterostructure engineering with hBN significantly improves gas sensor performance.
Understanding the SBH modulation mechanism is key to optimizing gas sensitivity.
Optoelectronic modulation offers a promising pathway for next-generation smart gas sensors.