Umfang:
Online-Ressource
ISSN:
2192-6506
Inhalt:
Abstract: Understanding how the detailed nanoscale structure governs the interfacial interactions and reactivities is key to the exploration of nanostructured chemical sensors. We describe herein novel findings of an investigation of a palladium–gold alloy nanowire interface for hydrogen sensing. A dielectrophoretic growth pathway was utilized for controllable fabrication of the alloyed nanowires with minimum branching structures on a microelectrode device using controlled ratios of palladium and gold precursors in a two‐step mechanism, a nucleation process initiated at a lower alternating current (AC) frequency followed by a growth process at a higher frequency up to 15 MHz. The nanowires showed a reduced branching propensity and highly oriented 1D feature, with the bimetallic composition scaling linearly with the frequency. The nanowires exhibited excellent responses to hydrogen in concentrations as low as 0.5 % by volume. The hydrogen‐response characteristic represents an optimized balance of the gold‐induced lattice expansion of palladium and hydrogen adsorption‐induced phase and stress changes, a new insight into the sensing mechanism of the alloy nanowire. The mechanistic sensing details are also discussed in correlation with the growth mechanism, which provides a new insight into the synergy of the bimetallic composition of the alloy nanowires for the enhanced sensitivity for the detection of hydrogen.
In:
volume:80
In:
number:4
In:
year:2015
In:
pages:722-730
In:
extent:9
In:
ChemPlusChem, Weinheim : Wiley-VCH, 2012-, 80, Heft 4 (2015), 722-730 (gesamt 9), 2192-6506
Sprache:
Englisch
DOI:
10.1002/cplu.201402404
URN:
urn:nbn:de:101:1-2022122308590226096278
URL:
https://doi.org/10.1002/cplu.201402404
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2022122308590226096278
URL:
https://d-nb.info/1276444192/34
URL:
https://doi.org/10.1002/cplu.201402404
