Correlating surface growth of nanoporous gold with electrodeposition parameters to optimize amperometric sensing of nitrite
| Autor: | Josué M. Gonçalves, Anandhakumar Sukeri, Abhishek Kumar, Mauro Bertotti, Koiti Araki |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Scanning electron microscope FILMES FINOS 02 engineering and technology Applied potential 010402 general chemistry Electrochemistry 01 natural sciences chemistry.chemical_compound Materials Chemistry Electrical and Electronic Engineering Nitrite Instrumentation Nanoporous Metals and Alloys Substrate (chemistry) 021001 nanoscience & nanotechnology Condensed Matter Physics Amperometry 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical engineering chemistry Electrode 0210 nano-technology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2018.02.125 |
| Popis: | Nanoporous gold (NPG) films were electrodeposited on a gold substrate and the generated platform was used for amperometric determination of nitrite. The electrochemical characterization of different NPG surfaces showed that the electrocatalytic activity concerning the nitrite anodic oxidation is strongly modulated by changes in the electrodeposition parameters. Microstructural analysis using scanning electron microscopy, profilometry and X-ray diffraction revealed changes in the deposited layers, following a unique growth mechanism strongly dependent on applied potential and electrodeposition time. Accordingly, more negative potentials resulted in changes in morphology from highly branched standing flakes to flat dense surfaces, whereas higher electrodeposition times led to the evolution of nanodendrites. NPG electrodes prepared by electrodeposition at −4 V for 100 s were selected as the best platform for nitrite determinations at 0.77 V. Evaluation of sensing characteristics demonstrated the sensor exhibits a very fast response time ( |
| Databáze: | OpenAIRE |
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