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Updated: Apr 1, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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Published on: March 29, 2016

Pd-Sensitized In₂Se₃ Films Boost Low-Concentration H₂ Detection.

Wei Zheng¹, Shilei Fan¹, Xiao Chang¹

¹College of Physics, Qingdao University, Qingdao 266071, China.

|March 31, 2026

Summary

Detecting hydrogen (H₂) at room temperature is difficult. This study developed a palladium-sensitized indium selenide (Pd-In₂Se₃) sensor that achieves highly sensitive and rapid H₂ detection at room temperature.

Keywords:

H2 In2Se3 Pd low power sensor

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Published on: December 4, 2017

Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Chemiresistive sensors face challenges in detecting hydrogen (H₂) at room temperature (RT).
Indium selenide (In₂Se₃) films are typically sensitive to nitrogen dioxide (NO₂) but not H₂.

Purpose of the Study:

To synthesize and integrate palladium-sensitized In₂Se₃ (Pd-In₂Se₃) films for effective H₂ detection at RT.
To investigate the role of palladium (Pd) catalysts in enhancing H₂ sensing performance.
To explore the fundamental mechanism of catalyst sensitization in selenide-based sensors.

Main Methods:

Fabrication of In₂Se₃ films using chemical vapor deposition (CVD) and atomic layer deposition (ALD).
Sensitization of In₂Se₃ films with palladium (Pd) catalysts.
Characterization of sensor response to H₂ and NO₂ at RT.
Density functional theory (DFT) calculations to elucidate the sensing mechanism.

Main Results:

Pristine In₂Se₃ films showed high NO₂ response but were insensitive to H₂.
Pd-In₂Se₃ sensors demonstrated high sensitivity to sub-parts-per-million (ppm) levels of H₂ at RT.
The sensitized sensors exhibited rapid response and recovery times for H₂ detection.
DFT calculations confirmed the critical role of Pd nanoparticles in the H₂ sensing reactions.

Conclusions:

Palladium sensitization significantly enhances the H₂ detection capabilities of In₂Se₃ films at room temperature.
This work presents a promising approach for developing high-performance selenide-based sensors for low-concentration H₂ monitoring.
The study provides fundamental insights into the catalytic sensitization mechanism crucial for advanced sensor design.