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Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

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ReSe₂/metal interface for hydrogen gas sensing.

Sikandar Aftab¹, Ms Samiya², Mian Sabir Hussain³

¹Department of Engineering Science, Simon Fraser University, Burnaby, Canada.

Journal of Colloid and Interface Science

|July 2, 2021

Summary

This summary is machine-generated.

This study shows multilayered ReSe2 nanoflakes enable sensitive hydrogen gas detection by modulating Schottky barrier height. This leads to cost-effective, fast, room-temperature sensors based on 2D materials.

Keywords:

Fermi levels Hydrogen ReSe(2)Schottky barrier Sensitivity

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Published on: March 29, 2016

Area of Science:

Materials Science
Nanotechnology
Chemical Sensing

Background:

Fermi level alignment is crucial for sensor performance in two-dimensional (2D) materials.
Schottky barrier height modulation impacts sensor characteristics like response time and stability.

Purpose of the Study:

To investigate the effect of Schottky barrier height modulation on hydrogen gas sensing using multilayered ReSe2 nanoflakes.
To develop cost-effective, fast, room-temperature sensors based on 2D materials.

Main Methods:

Fabrication of field-effect transistor (FET) and Schottky diode devices using Pd/Au electrodes and multilayered ReSe2 nanoflakes.
Testing sensor response to varying hydrogen concentrations (50–900 ppm) at room temperature (22 °C).
Analysis of transfer curves (Ids-Vbg) and rectifying characteristics (Ids-Vds).

Main Results:

Modulation of Schottky barrier height significantly altered device characteristics with hydrogen concentration.
High sensitivity (669–1198% response) observed for multilayered ReSe2 sensors.
Monolayer/bilayer systems showed no sensitivity due to electrode diffusion.
Ideality factor changed from 4 to 1.6 and relative response increased from 0 to 3.5 with increasing hydrogen concentration (0–900 ppm).

Conclusions:

Multilayered ReSe2 nanoflakes are promising for sensitive hydrogen gas detection.
Schottky barrier engineering offers a viable strategy for developing advanced 2D material-based sensors.
The developed sensors are cost-effective, fast, and operate at room temperature.