Hydrogen sensing of nanoporous palladium films supported by anodic aluminum oxides

Dongyan Ding, Zhi Chen, Chi Lu

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Nanoporous Pd films supported by porous anodic aluminum oxides (AAOs) were investigated regarding their performance in detecting hydrogen gas with concentrations up to 1% in nitrogen at room temperature. Compared with dense Pd films that usually have very slow responses, nanoporous Pd films based on AAOs were found to have a quick and reversible response due to their enhanced absorption and disorption of hydrogen. Using thinner nanoporous films, concentrations of hydrogen as low as 250 ppm can be detected and a much higher sensitivity, up to 12% resistance variation, was obtained. Two competing hydrogen-sensing processes, the phase-induced increase of film resistance and the break-junction-induced decrease of film resistance, were found in the nanoporous Pd films upon absorption of hydrogen.

Original languageEnglish
Pages (from-to)182-186
Number of pages5
JournalSensors and Actuators, B: Chemical
Issue number1
StatePublished - Dec 14 2006

Bibliographical note

Funding Information:
This work was supported by National Science Foundation (EPSCOR0447479), Department of Energy (DE-FG02-00ER4582 and DE-FG26-04NT42171), and Army Research Laboratory (W911NF-04-2-0023).


  • Hydrogen sensor
  • Palladium
  • Porous nanofilm
  • Resistance

ASJC Scopus subject areas

  • 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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