We studied the H2 sensing properties of Pd nanoparticles on vertical standing Si nanowire (NW) arrays for the detection of dissolved hydrogen (H2) gas in transformer oil. The Pd-coated Si NW arrays were fabricated by using the aqueous electroless etching method and sputtering. The Pd-coated Si NW arrays were immersed and measured in transformer oil with various dissolved concentrations of H2. We found that Pd-coated Si NW arrays showed significantly superior performance with regard to the response (∼1000%), the lowest detection limit (1 ppm), and the response time (600 s). The Pd-coated Si NW arrays showed a temperature coefficient of resistance (TCR) of 6.53 × 10−3 °C-1 at various oil temperatures (20–80 °C). Pd-coated Si NW arrays showed good reliability for the detection of H2 in oil at room temperature (20 °C), with nearly the same initial resistance for 30 days.
Bibliographical noteFunding Information:
This work was supported by the Korean government (MSIT) ( 2017R1A2A1A17069528 ), and the Basic Science Research Program ( 2017M3A9F1052297 ), and the Priority Research Centers Program ( 2009-0093823 ) through the National Research Foundation of Korea (NRF) .
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry