Application of integrated SECM ultra-micro-electrode and AFM force probe to biosensor surfaces

Bioelectrochemistry. 2004 Jun;63(1-2):217-24. doi: 10.1016/j.bioelechem.2004.01.001.

Abstract

The integration of scanning electrochemical ultra-micro-electrode (UME) with atomic force microscope cantilever probe have been achieved by using a homemade photolithography system. A gold-film-coated AFM cantilever was insulated with photo resist coating and a pointed end of the AFM probe was opened by illuminating with maskless arbitrary optical micro-pattern generator. To realize precise control of probe sample distance constantly, the resulting scanning electrochemical microscopy (SECM)-AFM probe was operated using a dynamic force microscopy (DFM) technique with magnetic field excitation. From a steady-state voltammetric experiment, the effective electrode diameters of the probes thus prepared were estimated to be from 0.050 to 6.2 microm. The capability of this SECM-AFM probe have been tested using gold comb in the presence of Fe(CN)(6)(3-). The simultaneous imaging of the topography and electrochemical activity of the strip electrode was successfully obtained. We also used the SECM-AFM to examine in situ topography and enzymatic activity measurement. Comparison of topography and oxidation current profiles above enzyme-modified electrode showed active parts distribution of biosensor surface.

Publication types

  • Evaluation Study
  • Validation Study

MeSH terms

  • Biosensing Techniques / instrumentation*
  • Electrochemistry / instrumentation*
  • Electrochemistry / methods
  • Equipment Design
  • Equipment Failure Analysis / instrumentation
  • Equipment Failure Analysis / methods*
  • Feasibility Studies
  • Glucose Oxidase / analysis*
  • Glucose Oxidase / ultrastructure*
  • Materials Testing / instrumentation
  • Materials Testing / methods
  • Microscopy / instrumentation*
  • Microscopy / methods
  • Microscopy, Atomic Force / instrumentation*
  • Microscopy, Atomic Force / methods
  • Surface Properties

Substances

  • Glucose Oxidase