Local pH measurement with scanning ion conductance microscopy

Celeste A. Morris, Chiao Chen Chen, Takashi Ito, Lane A. Baker

研究成果: Article同行評審

26 引文 斯高帕斯(Scopus)

摘要

We report microscale pH probes and their application as a scanning probe in Scanning Ion Conductance Microscopy (SICM). Experiments are performed with electrodes that consist of a thin gold layer deposited on one side of a nanopipet. Subsequent insulation of the electrode with parylene and electropolymerization of aniline to form a polyaniline (PANi) thin film on the gold electrode surface creates a microscale pH probe with a dynamic range of pH 2.5-12 and sensitivity of 0.02 ΔpH. Porous membranes were examined with prepared electrodes. Ion current measured at the nanopipet opening served to control the position of the electrode with respect to themembrane surface and to report local conductance in the vicinity of the nanopipet, while local pH wasmeasured by recording the potential difference between the PANi electrode and a reference electrode. Application of a transmembrane potential difference was utilized for additional control over migration across the membrane. Lateral resolution of the EMF response was studied with micrometer diameter pores. Additionally, the vertical resolution of the EMF response was studied as the pipet was lowered into the pores where a ΔpH of 0.13 was measured.

原文English
頁(從 - 到)H430-H435
期刊Journal of the Electrochemical Society
160
發行號8
DOIs
出版狀態Published - 2013 五月 7

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 可再生能源、永續發展與環境
  • 表面、塗料和薄膜
  • 電化學
  • 材料化學

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