Cracked palladium films on an elastomeric substrate for use as hydrogen sensors

Junmin Lee, Jin Seo Noh, Seung Hyun Lee, Byeongcheol Song, Hwaebong Jung, Wonkyung Kim, Wooyoung Lee

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We have investigated a lithography-free technique for On-Off type hydrogen sensors using a cracked palladium (Pd) film on an elastomeric substrate. Cracks were induced in a sputtered Pd film simply by undergoing hydrogen absorption and desorption processes. Compared to the same thickness of a Pd film on a Si/SiO2 substrate that relied on the electron scattering mechanism, a cracked Pd film on an elastomeric substrate operated as a reversible On-Off hydrogen sensor based on the crack open-close mechanism when exposed to hydrogen. The thickness of a Pd film on the elastomeric substrate plays a significant role in determining the sensing mode of the cracked Pd film. The cracked Pd film with a thickness of 9-11 nm on the elastomeric substrate showed reversible and perfect On-Off responses under a wide range of hydrogen concentrations with large current variations and a fast response time of less than 1 s.

Original languageEnglish
Pages (from-to)7934-7939
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number9
DOIs
Publication statusPublished - 2012 May 1

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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