Fabrication of nanoelectrodes and metal clusters by electrodeposition

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Jeyavel Velmurugan, Michael V Mirkin

Abstract

Most nanometer-sized electrodes reported to date are made from either Pt or Au. For technical reasons, it is difficult to make nanoelectrodes from many other metals (e.g. Hg) by heat-sealing microwires into glass capillaries or by other established techniques. Such nanoelectrodes can be useful for a wide range of analytical and physicochemical applications from high sensitivity stripping analysis (Hg) to pH nano-sensors to studies of electrocatalysis. In this paper, nanometer-sized metal electrodes are prepared by electrodeposition of Hg or Pt on disk-type, polished or recessed nanoelectrodes. The deposition of Hg is monitored chronoamperometrically to produce near-hemispherical electrodes, which are characterized by voltammetry and scanning electrochemical microscopy (SECM). The well-shaped deposits of a solid metal (Pt) at Au nanoelectrodes are prepared and imaged by scanning electron microscopy (SEM). Catalytic metal clusters can also be prepared using this methodology. Electrodes with the metal surface flush with glass insulator, most suitable for quantitative voltammetric and SECM experiments are fabricated by electrodeposition of a metal inside an etched nanocavity.

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Citations

Oct 28, 2011·Physical Chemistry Chemical Physics : PCCP·Michael V MirkinYixian Wang
May 23, 2012·Proceedings of the National Academy of Sciences of the United States of America·Yixian WangChristian Amatore
Jun 25, 2014·Analytical Chemistry·Xinyu ZhuYuanhua Shao
Aug 12, 2016·The Analyst·Yunshan FanBo Zhang
Oct 14, 2014·Analytical Chemistry·Zachary J Barton, Joaquín Rodríguez-López

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