4.3 Article

Fabrication of nanostructured Pt electrodes templated by nanoporous anodic alumina for electrochemical sensors

Journal

JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 61, Issue SD, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.35848/1347-4065/ac51be

Keywords

nanofabrication; nanoporous anodic alumina; electrochemical sensors; electroless deposition

Funding

  1. JSPS KAKENHI [21K05250]
  2. Grants-in-Aid for Scientific Research [21K05250] Funding Source: KAKEN

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In this study, a simple method for the formation of Pt nanopillars sandwiched between W metal layers and nanoporous anodic alumina membranes was demonstrated. By selectively dissolving WO3 and electrolessly depositing Pt, the formation of Pt nanopillars was achieved under conditions that are not affected by complex biological fluid components.
Although platinum electrodes are widely used in electrochemical sensors their functionality can be affected by formed components of complex biological fluids. We demonstrated a simple approach to the formation of Pt nanopillars sandwiched between W metal layers and nanoporous anodic alumina membranes, by anodization of W/Al bilayers and substitution of WO3 nanopillars formed by the local anodization of W under the nanopores with Pt. By exploiting the Pourbaix corrosion diagram of W, we could find conditions that allow the selective dissolution of WO3 in pH = 7.4 buffer solution and formation of Pt nanopillars inside the nanoporous aluminum membrane via electroless deposition.

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