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Pd-Ag Alloy Dendritic Nanowires: Fabrication and Application in Hydrogen Sensor

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Abstract:

Dendritic Pd-Ag alloy nanowires (Pd-Ag DNWs) with different bimetallic composition have been directly self-assembled on the microelectrodes from mixed solutions of palladium and silver ions by applying an alternating current (AC) field. The size and morphology of the final product were controlled via adjusting the electrodeposition parameters and the metal ion concentration ratio. The influence of three factors on the bimetallic composition in alloy nanowires was examined. Structural characterizations suggest that there was a preferential growth along 〈200〉 and 〈111〉 directions, leading to the formation of Pd-Ag nanodendritic wires with 150–200 nm in stem and branch diameter. The mechanism of forming the DNWs is discussed. The DNWs were studied as sensing materials for the detection of hydrogen, and they were found to exhibit good sensitivity and reproducibility. The Pd-Ag sensing materials with 22.2 wt% Ag content possessed were also found to display a rapid response time of less than 1 min for 4% (V/V) hydrogen concentration.

Keywords: DENDRITIC NANOSTRUCTURE; ELECTRODEPOSITION; HYDROGEN SENSOR; SELF-ASSEMBLY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.4989

Publication date: November 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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