Palladium Nanowire Hydrogen Sensor

Deep Banerji, Massood Z. Atashbar, Srikanth Singamaneni

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


Palladium nanowires, synthesized by template- nanomanufacturing techniques, has been studied for hydrogen gas sensing applications at room temperature. In this study parallel arrays of Pd nanowires were fabricated by electrodeposition from an aqueous plating solution onto an HOPG surface. The nanowires were then transferred onto a polystyrene film and silver electrical contact pads were fabricated by shadow masking. The morphology of the nanowires was analyzed using Atomic Force Microscope (AFM) in non-contact mode and the diameter of the observed nanowires was measured to be approximately 250nm. Scanning Electron Microscope (SEM) images revealed that the nanowires fabricated by this procedure were parallel and continuous. Experimental results indicated that the sensors are highly sensitive to Hydrogen, showing a two-order change in conductance. The morphology of the nanowires was analyzed using SEM and AFM in order to understand the properties responsible for the high sensitivity of the nanowires. SEM images showed that the nanowires contain nanogaps in absence of H 2. On, exposure to H 2 palladium absorbed hydrogen resulting in the expansion of Pd grains. This expansion results in the closing of the nanogaps. The expansion occurred due to the phase transition from alpha to beta and the palladium lattice expansion.

Original languageEnglish
Number of pages6
StatePublished - 2003
EventSecond International Conference on Sensors: IEEE Sensors 2003 - Toronto, Ont., Canada
Duration: Oct 22 2003Oct 24 2003


ConferenceSecond International Conference on Sensors: IEEE Sensors 2003
CityToronto, Ont.


  • Electrodeposition
  • HOPG
  • Hydrogen sensing
  • Palladium nanowires
  • Template based nanomanufacturing


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