Highly sensitive hydrogen sensors: Pd-coated Si nanowire arrays for detection of dissolved hydrogen in oil

Byungjin Jang, Min Hyung Kim, Jisun Baek, Wonkung Kim, Wooyoung Lee

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)809-814
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume273
DOIs
Publication statusPublished - 2018 Nov 10

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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