Electroreflectance study of gold nanoparticles immobilized on an aminoalkanethiol monolayer coated on a polycrystalline gold electrode surface

Takamasa Sagara, Naoyuki Kato, Naotoshi Nakashima

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

Citrate-stabilized gold (Au) nanoparticles of a diameter of 11 nm were immobilized on a monolayer of aminoundecanethiol (1-mercapto-11-aminoundecane) coated on a polycrystalline Au electrode surface. A quartz crystal microbalance measurement of the deposition process of the Au particles revealed that the saturated deposition amount is 10% of a 2D close-packed monoparticle layer, and this coverage was confirmed by an atomic force microscopy (AFM) observation. The Au particle layer was characterized by the use of potential-modulated UV-visible reflectance spectroscopy (electroreflectance spectroscopy). The electroreflectance (ER) band at the plasmon absorption wavelength of the Au particles was positive-going, indicating that the plasmon absorption becomes stronger when changing the electrode potential to more negative. The plasmon absorption band shifted to longer wavelength when the electrode potential approaches to the potential of zero-charge, Epzc, of the Au electrode. The ER signal intensity also showed a maximum around Epzc. In light of good electronic communication between the Au electrode substrate and the deposited Au particles as demonstrated by reversible redox waves of solution phase species, the ER signal was interpreted as being originated from the potential-dependent charging-discharging process of the immobilized Au particles; a more negatively charged Au particle exhibits a stronger and sharper plasmon absorption band at a shorter wavelength. The implications of the ER signal were discussed.

Original languageEnglish
Pages (from-to)1205-1212
Number of pages8
JournalJournal of Physical Chemistry B
Volume106
Issue number6
DOIs
Publication statusPublished - Feb 14 2002

Fingerprint

Gold
Nanoparticles
Monolayers
Electrodes
gold
nanoparticles
electrodes
Wavelength
Absorption spectra
Spectrum Analysis
wavelengths
Spectroscopy
Quartz Crystal Microbalance Techniques
absorption spectra
Atomic Force Microscopy
Quartz crystal microbalances
citrates
Charged particles
quartz crystals
Citric Acid

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Electroreflectance study of gold nanoparticles immobilized on an aminoalkanethiol monolayer coated on a polycrystalline gold electrode surface. / Sagara, Takamasa; Kato, Naoyuki; Nakashima, Naotoshi.

In: Journal of Physical Chemistry B, Vol. 106, No. 6, 14.02.2002, p. 1205-1212.

Research output: Contribution to journalArticle

@article{375410a309b9439e8f1adf94847c7cfc,
title = "Electroreflectance study of gold nanoparticles immobilized on an aminoalkanethiol monolayer coated on a polycrystalline gold electrode surface",
abstract = "Citrate-stabilized gold (Au) nanoparticles of a diameter of 11 nm were immobilized on a monolayer of aminoundecanethiol (1-mercapto-11-aminoundecane) coated on a polycrystalline Au electrode surface. A quartz crystal microbalance measurement of the deposition process of the Au particles revealed that the saturated deposition amount is 10{\%} of a 2D close-packed monoparticle layer, and this coverage was confirmed by an atomic force microscopy (AFM) observation. The Au particle layer was characterized by the use of potential-modulated UV-visible reflectance spectroscopy (electroreflectance spectroscopy). The electroreflectance (ER) band at the plasmon absorption wavelength of the Au particles was positive-going, indicating that the plasmon absorption becomes stronger when changing the electrode potential to more negative. The plasmon absorption band shifted to longer wavelength when the electrode potential approaches to the potential of zero-charge, Epzc, of the Au electrode. The ER signal intensity also showed a maximum around Epzc. In light of good electronic communication between the Au electrode substrate and the deposited Au particles as demonstrated by reversible redox waves of solution phase species, the ER signal was interpreted as being originated from the potential-dependent charging-discharging process of the immobilized Au particles; a more negatively charged Au particle exhibits a stronger and sharper plasmon absorption band at a shorter wavelength. The implications of the ER signal were discussed.",
author = "Takamasa Sagara and Naoyuki Kato and Naotoshi Nakashima",
year = "2002",
month = "2",
day = "14",
doi = "10.1021/jp011807w",
language = "English",
volume = "106",
pages = "1205--1212",
journal = "Journal of Physical Chemistry B Materials",
issn = "1520-6106",
publisher = "American Chemical Society",
number = "6",

}

TY - JOUR

T1 - Electroreflectance study of gold nanoparticles immobilized on an aminoalkanethiol monolayer coated on a polycrystalline gold electrode surface

AU - Sagara, Takamasa

AU - Kato, Naoyuki

AU - Nakashima, Naotoshi

PY - 2002/2/14

Y1 - 2002/2/14

N2 - Citrate-stabilized gold (Au) nanoparticles of a diameter of 11 nm were immobilized on a monolayer of aminoundecanethiol (1-mercapto-11-aminoundecane) coated on a polycrystalline Au electrode surface. A quartz crystal microbalance measurement of the deposition process of the Au particles revealed that the saturated deposition amount is 10% of a 2D close-packed monoparticle layer, and this coverage was confirmed by an atomic force microscopy (AFM) observation. The Au particle layer was characterized by the use of potential-modulated UV-visible reflectance spectroscopy (electroreflectance spectroscopy). The electroreflectance (ER) band at the plasmon absorption wavelength of the Au particles was positive-going, indicating that the plasmon absorption becomes stronger when changing the electrode potential to more negative. The plasmon absorption band shifted to longer wavelength when the electrode potential approaches to the potential of zero-charge, Epzc, of the Au electrode. The ER signal intensity also showed a maximum around Epzc. In light of good electronic communication between the Au electrode substrate and the deposited Au particles as demonstrated by reversible redox waves of solution phase species, the ER signal was interpreted as being originated from the potential-dependent charging-discharging process of the immobilized Au particles; a more negatively charged Au particle exhibits a stronger and sharper plasmon absorption band at a shorter wavelength. The implications of the ER signal were discussed.

AB - Citrate-stabilized gold (Au) nanoparticles of a diameter of 11 nm were immobilized on a monolayer of aminoundecanethiol (1-mercapto-11-aminoundecane) coated on a polycrystalline Au electrode surface. A quartz crystal microbalance measurement of the deposition process of the Au particles revealed that the saturated deposition amount is 10% of a 2D close-packed monoparticle layer, and this coverage was confirmed by an atomic force microscopy (AFM) observation. The Au particle layer was characterized by the use of potential-modulated UV-visible reflectance spectroscopy (electroreflectance spectroscopy). The electroreflectance (ER) band at the plasmon absorption wavelength of the Au particles was positive-going, indicating that the plasmon absorption becomes stronger when changing the electrode potential to more negative. The plasmon absorption band shifted to longer wavelength when the electrode potential approaches to the potential of zero-charge, Epzc, of the Au electrode. The ER signal intensity also showed a maximum around Epzc. In light of good electronic communication between the Au electrode substrate and the deposited Au particles as demonstrated by reversible redox waves of solution phase species, the ER signal was interpreted as being originated from the potential-dependent charging-discharging process of the immobilized Au particles; a more negatively charged Au particle exhibits a stronger and sharper plasmon absorption band at a shorter wavelength. The implications of the ER signal were discussed.

UR - http://www.scopus.com/inward/record.url?scp=0037075413&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037075413&partnerID=8YFLogxK

U2 - 10.1021/jp011807w

DO - 10.1021/jp011807w

M3 - Article

AN - SCOPUS:0037075413

VL - 106

SP - 1205

EP - 1212

JO - Journal of Physical Chemistry B Materials

JF - Journal of Physical Chemistry B Materials

SN - 1520-6106

IS - 6

ER -