resumo
A novel electrochemical wire etching method of fabrication of ultrasharp nanoelectrodes is reported. Tungsten wires can be sharpened to less than 10 nm tip radius in a reproducible manner in less than 1 min by using controllable hydrodynamic electrolyte flow combined with optimized electrochemical etching parameters. The method relies on the variations of the electric field at the surface of a metal wire, while the electrolyte solution is in motion, rather than on the ionic gradient generated in a static solution. (C) 2014 AIP Publishing LLC.
palavras-chave
SCANNING-TUNNELING-MICROSCOPY; TUNGSTEN TIPS; MICROELECTRODES; ELECTROHYDRODYNAMICS; ELECTRODE; SENSORS; WIRES; STM; PH
categoria
Instruments & Instrumentation; Physics
autores
Silva, EL; Silva, RF; Zheludkevich, M; Oliveira, FJ
nossos autores
Eduardo Luís Trindade da Silva
Bolseiro de pós-Doutoramento
Filipe José Alves de Oliveira
Investigador Principal
Mikhail Zheludkevich
Investigador Principal Convidado
Rui Ramos Ferreira e Silva
Professor associadoProjectos
Corrosion adn corrosion protection in multi-material systems (PTDC/CTM/108446/2008)
BIOCORDIAN – Ultramicroelétrodos de SECM em Diamante Nanocristalino para Biologia e Corrosão (PTDC/CTM-MET/113645/2009)
Enhancing Scanning Ion-Selective Electrode Technique - SISET (SISET)
agradecimentos
E. L. Silva would like to acknowledge FCT for the Grant No. SFRH/BD/61675/2009. This work was supported by Project Nos. PTDC/CTM/108446/2008, PTDC/CTM-MET/113645/2009, funded by FEDER /COMPETE programme - Portuguese Science and Technology Foundation and by the SISET project (FP7-PEOPLE-2010-IRSES Reference 269282).