Comparison of spherical nanogold particles and nanogold plates for the oxidation of dopamine and ascorbic acid

Rajendra N. Goyal, Ali Umar Akrajas, Munetaka Oyama

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Spherical gold nanoparticles of different size and Au nanoplates were grown at indium tin oxide surface and characterized using SEM. The application of different electrodes in voltammetry for determination of dopamine and ascorbic acid indicated that oxidation of these biomolecules occur at these electrodes in diffusion controlled process and Au nanoplates modified indium tin oxide electrodes exhibit atleast two to three times higher current than spherical nanogold particles of different size. The observed behaviour suggests that Au nanoplates exhibit higher electrocatalytic activity than spherical gold nanoparticles. The reason for such a behaviour may be due to their (1 1 1) lattice plane as the basal plane as well as due to more available surface edges. As dimensions of nanoplates is of the order of 400-500 nm, the increased surface area in the case of nanoplates also appears to play a significant role.

Original languageEnglish
Pages (from-to)58-61
Number of pages4
JournalJournal of Electroanalytical Chemistry
Volume631
Issue number1-2
DOIs
Publication statusPublished - 1 Jun 2009

Fingerprint

Ascorbic acid
Ascorbic Acid
Dopamine
Tin oxides
Gold
Oxidation
Indium
Electrodes
Nanoparticles
Biomolecules
Voltammetry
Scanning electron microscopy
indium tin oxide

Keywords

  • Ascorbic acid
  • Dopamine
  • Nanogold
  • Voltammetric determination

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Comparison of spherical nanogold particles and nanogold plates for the oxidation of dopamine and ascorbic acid. / Goyal, Rajendra N.; Akrajas, Ali Umar; Oyama, Munetaka.

In: Journal of Electroanalytical Chemistry, Vol. 631, No. 1-2, 01.06.2009, p. 58-61.

Research output: Contribution to journalArticle

@article{94ed0c67c716469080040475d4d0fdf3,
title = "Comparison of spherical nanogold particles and nanogold plates for the oxidation of dopamine and ascorbic acid",
abstract = "Spherical gold nanoparticles of different size and Au nanoplates were grown at indium tin oxide surface and characterized using SEM. The application of different electrodes in voltammetry for determination of dopamine and ascorbic acid indicated that oxidation of these biomolecules occur at these electrodes in diffusion controlled process and Au nanoplates modified indium tin oxide electrodes exhibit atleast two to three times higher current than spherical nanogold particles of different size. The observed behaviour suggests that Au nanoplates exhibit higher electrocatalytic activity than spherical gold nanoparticles. The reason for such a behaviour may be due to their (1 1 1) lattice plane as the basal plane as well as due to more available surface edges. As dimensions of nanoplates is of the order of 400-500 nm, the increased surface area in the case of nanoplates also appears to play a significant role.",
keywords = "Ascorbic acid, Dopamine, Nanogold, Voltammetric determination",
author = "Goyal, {Rajendra N.} and Akrajas, {Ali Umar} and Munetaka Oyama",
year = "2009",
month = "6",
day = "1",
doi = "10.1016/j.jelechem.2009.03.013",
language = "English",
volume = "631",
pages = "58--61",
journal = "Journal of Electroanalytical Chemistry",
issn = "0368-1874",
publisher = "Elsevier Sequoia",
number = "1-2",

}

TY - JOUR

T1 - Comparison of spherical nanogold particles and nanogold plates for the oxidation of dopamine and ascorbic acid

AU - Goyal, Rajendra N.

AU - Akrajas, Ali Umar

AU - Oyama, Munetaka

PY - 2009/6/1

Y1 - 2009/6/1

N2 - Spherical gold nanoparticles of different size and Au nanoplates were grown at indium tin oxide surface and characterized using SEM. The application of different electrodes in voltammetry for determination of dopamine and ascorbic acid indicated that oxidation of these biomolecules occur at these electrodes in diffusion controlled process and Au nanoplates modified indium tin oxide electrodes exhibit atleast two to three times higher current than spherical nanogold particles of different size. The observed behaviour suggests that Au nanoplates exhibit higher electrocatalytic activity than spherical gold nanoparticles. The reason for such a behaviour may be due to their (1 1 1) lattice plane as the basal plane as well as due to more available surface edges. As dimensions of nanoplates is of the order of 400-500 nm, the increased surface area in the case of nanoplates also appears to play a significant role.

AB - Spherical gold nanoparticles of different size and Au nanoplates were grown at indium tin oxide surface and characterized using SEM. The application of different electrodes in voltammetry for determination of dopamine and ascorbic acid indicated that oxidation of these biomolecules occur at these electrodes in diffusion controlled process and Au nanoplates modified indium tin oxide electrodes exhibit atleast two to three times higher current than spherical nanogold particles of different size. The observed behaviour suggests that Au nanoplates exhibit higher electrocatalytic activity than spherical gold nanoparticles. The reason for such a behaviour may be due to their (1 1 1) lattice plane as the basal plane as well as due to more available surface edges. As dimensions of nanoplates is of the order of 400-500 nm, the increased surface area in the case of nanoplates also appears to play a significant role.

KW - Ascorbic acid

KW - Dopamine

KW - Nanogold

KW - Voltammetric determination

UR - http://www.scopus.com/inward/record.url?scp=65449157970&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=65449157970&partnerID=8YFLogxK

U2 - 10.1016/j.jelechem.2009.03.013

DO - 10.1016/j.jelechem.2009.03.013

M3 - Article

AN - SCOPUS:65449157970

VL - 631

SP - 58

EP - 61

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

SN - 0368-1874

IS - 1-2

ER -