Fabrication and characterization of a molecular adhesive layer for micro- and nanofabricated electrochemical electrodes

• When making nanoelectrodes for applications in liquid cells it is plausible that the less noble metal layer may be negatively affected, i.e. it will be etched away leading to very unstable conditions during operation. Here we describe a dry method to produce such a molecular layer consisting of mercaptopropyltriethoxysilane (MPTS) making it possible to controllable and reproducibly form a covalently bound monolayer of MPTS to the SiO2 surface. From Photoelectron Spectroscopy measurements we could conclude that the layer thickness corresponds to a monolayer. We have electrochemically characterized such electrodes by cyclic voltammetry. Furthermore, we have successfully patterned such layers at both micro- and nanometer scale showing the possibilities to fabricate chemically selective and active areas that may be used in various applications

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

SiO2 surface

covalently bound monolayer

mercaptopropyltriethoxysilane

molecular layer

dry method

etching

noble metal layer

liquid cells

nanoelectrodes

microfabricated electrochemical electrodes

molecular adhesive layer

nanofabricated electrochemical electrodes

Au

SiO2

chemically selective fabrication

photoelectron spectroscopy

electrochemical characterization

cyclic voltammetry

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