Development of nanoporous gold electrodes for electrochemical applications

Publication: Research - peer-reviewConference article – Annual report year: 2011

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In this work we have used simple microfabrication techniques and chemical de-alloying of co-sputtered AgAu alloys to create nanoporous gold (np-Au) electrodes. The physical properties of the np-Au electrodes were investigated using scanning electron microscopy with energy dispersive X-ray analysis, X-ray photo-electron spectroscopy and profilometer. The electrochemical performance of the np-Au electrodes was measured by cyclic voltammetry and electrochemical impedance spectroscopy. We have fabricated np-Au electrodes with pore sizes between 10 nm and 60 nm, directly related to the Ag:Au ratio. The electrochemical results reveal that np-Au electrodes have much lower impedance than the conventional Au electrodes, due to the significantly higher surface area to volume ratio of np-Au. The np-Au electrodes made from Ag66Au34 and Ag60Au40 show more than 10-fold magnitude reduction in impedance compared to conventional Au electrodes. These results show that np-Au electrodes have a great potential for electrochemical applications.
Original languageEnglish
JournalMicroelectronic Engineering
Publication date2011
Volume88
Pages2379-2382
ISSN0167-9317
DOIs
StatePublished

Conference

Conference36th International Conference on Micro- and Nano-Engineering
Number36
CountryItaly
CityGenoa
Period19/09/1022/09/10
Internet addresshttp://www.mne2010.org/
CitationsWeb of Science® Times Cited: 2

Keywords

  • Nanoporous gold, Electrochemistry, Cyclic voltammetry, Electrochemical impedance spectroscopy
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