Ion-transfer voltammetry at silicon membrane-based arrays of micro-liquid-liquid interfaces

Lab on a Chip
Raúl ZazpeDamien W M Arrigan

Abstract

Microporous silicon membranes, fabricated by lithographic patterning and wet and dry silicon etching processes, were used to create arrays of micro-scale interfaces between two immiscible electrolyte solutions (muITIES) for ion-transfer voltammetry. These membranes served the dual functions of interface stabilization and enhancement of the rate of mass-transport to the interface. The pore radii were 6.5 microm, 12.8 microm and 26.6 microm; the pore-pore separations were ca. 20- to 40-times the pore radii and the membrane thickness was 100 microm. Deep reactive ion etching (DRIE) was used for pore drilling through the silicon, which had been previously selectively thinned by potassium hydroxide etching. DRIE produces hydrophobic fluorocarbon-coated internal pore walls. The small pore sizes and large pore-pore separations used resulted in steady-state voltammograms for the transfer of tetramethylammonium cation (TMA(+)) from the aqueous to the organic phase, whereas the reverse voltammetric sweeps were peak-shaped. These asymmetric voltammograms are consistent with the location of the ITIES at the aqueous side of the silicon membrane such that the organic phase fills the micropores. Comparison of the experimental currents to calc...Continue Reading

References

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Citations

Dec 15, 2012·Analytical and Bioanalytical Chemistry·Eva Alvarez de EulateDamien W M Arrigan
Sep 18, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Lukasz PoltorakAlain Walcarius
Mar 3, 2012·The Journal of Physical Chemistry. B·Rui Campos, Ritu Kataky
Mar 19, 2013·Analytica Chimica Acta·Grégoire Herzog, Valerio Beni
Jun 11, 2010·Physical Chemistry Chemical Physics : PCCP·Micheál D ScanlonDamien W M Arrigan
Oct 7, 2010·Physical Chemistry Chemical Physics : PCCP·Shaikh Nayeem FaisalHye Jin Lee
Jul 26, 2012·Chemistry, an Asian Journal·Eva Alvarez de EulateDamien W M Arrigan
Dec 25, 2012·Analytical Chemistry·Shane O'Sullivan, Damien W M Arrigan
Jun 13, 2018·Annual Review of Analytical Chemistry·Shudong ZhangYuanhua Shao
Jul 6, 2018·Faraday Discussions·Angelika HolzingerChristine Kranz

Related Concepts

Ions
Scanning Electron Microscopy
Silicon
Microarray Analysis

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