Low-Dimensional Palladium on Graphite-on-Paper Substrate for Hydrogen Sensing
Boyi Wang1, Takeshi Hashishin2, Dzung Viet Dao3
1School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China.
Sensors (Basel, Switzerland)
|May 28, 2022
Summary
A novel graphite-on-paper (GOP) substrate enhances palladium-based hydrogen sensor stability. This cost-effective GOP material improves thermo-electrical conductivity, maintaining sensor performance at elevated temperatures.
Area of Science:
- Materials Science
- Chemical Engineering
- Sensor Technology
Background:
- Paper substrates offer low cost but lack stability for palladium-based hydrogen sensors.
- Stabilizing detection signals is crucial for reliable hydrogen sensing applications.
Purpose of the Study:
- To develop a stable and cost-effective substrate for palladium-based hydrogen sensors.
- To investigate the effect of a graphite intermediate layer on sensor performance.
Main Methods:
- A graphite intermediate layer was applied to paper to create a graphite-on-paper (GOP) substrate.
- Quasi-1-dimensional palladium (Pd) thin films (8 nm and 60 nm) were deposited via vacuum evaporation.
- Hydrogen sensor performance was evaluated at 25 °C and 50 °C.
Main Results:
- The GOP substrate exhibited good thermo-electrical conductivity and simplified preparation.
- A continuous palladium microfiber network formed on the GOP substrate.
- Sensor performance at 25 °C was comparable to paper substrates.
- Heating-induced sensitivity loss was mitigated at 50 °C due to GOP's enhanced conductivity.
Conclusions:
- The GOP substrate effectively stabilizes palladium-based hydrogen sensors.
- This approach offers a low-cost, high-performance solution for hydrogen detection.
- The enhanced conductivity of GOP improves sensor reliability at higher temperatures.
