Electrostatic aggregation and formation of core-shell suprastructures in binary mixtures of charged metal nanoparticles

Alexander M. Kalsin, Anatoliy O. Pinchuk, Stoyan K. Smoukov, Maciej Paszewski, George C Schatz, Bartosz A. Grzybowski

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Electrostatic aggregation of oppositely charged silver and gold nanoparticles leads to the formation of core-shell clusters in which the shell is formed by the nanoparticles, which are in excess. Arguments based on Debye screening of interactions between like-charged particles help explain why these clusters are stable despite possessing net electric charge. The core-shell aggregates exhibit unusual optical properties with the resonance absorption of the shell particles enhanced by the particles in the core and that of the core suppressed by the shell. Experimental UV-vis absorption spectra are faithfully reproduced by Mie theory. The modeling allows for estimation of the numbers of particles forming the shell and of the shell's effective thickness. These theoretical predictions are substantiated by experiments using nanoparticles covered with different combinations of charged groups and performed at different values of pH.

Original languageEnglish
Pages (from-to)1896-1903
Number of pages8
JournalNano Letters
Volume6
Issue number9
DOIs
Publication statusPublished - Sep 2006

Fingerprint

Metal nanoparticles
Binary mixtures
binary mixtures
Electrostatics
Agglomeration
electrostatics
Nanoparticles
nanoparticles
metals
Electric charge
Charged particles
Silver
Gold
Absorption spectra
Screening
Mie scattering
electric charge
Optical properties
charged particles
screening

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Chemistry (miscellaneous)

Cite this

Electrostatic aggregation and formation of core-shell suprastructures in binary mixtures of charged metal nanoparticles. / Kalsin, Alexander M.; Pinchuk, Anatoliy O.; Smoukov, Stoyan K.; Paszewski, Maciej; Schatz, George C; Grzybowski, Bartosz A.

In: Nano Letters, Vol. 6, No. 9, 09.2006, p. 1896-1903.

Research output: Contribution to journalArticle

Kalsin, Alexander M. ; Pinchuk, Anatoliy O. ; Smoukov, Stoyan K. ; Paszewski, Maciej ; Schatz, George C ; Grzybowski, Bartosz A. / Electrostatic aggregation and formation of core-shell suprastructures in binary mixtures of charged metal nanoparticles. In: Nano Letters. 2006 ; Vol. 6, No. 9. pp. 1896-1903.
@article{0703e05d4a3d405aa9054f6a2021ca15,
title = "Electrostatic aggregation and formation of core-shell suprastructures in binary mixtures of charged metal nanoparticles",
abstract = "Electrostatic aggregation of oppositely charged silver and gold nanoparticles leads to the formation of core-shell clusters in which the shell is formed by the nanoparticles, which are in excess. Arguments based on Debye screening of interactions between like-charged particles help explain why these clusters are stable despite possessing net electric charge. The core-shell aggregates exhibit unusual optical properties with the resonance absorption of the shell particles enhanced by the particles in the core and that of the core suppressed by the shell. Experimental UV-vis absorption spectra are faithfully reproduced by Mie theory. The modeling allows for estimation of the numbers of particles forming the shell and of the shell's effective thickness. These theoretical predictions are substantiated by experiments using nanoparticles covered with different combinations of charged groups and performed at different values of pH.",
author = "Kalsin, {Alexander M.} and Pinchuk, {Anatoliy O.} and Smoukov, {Stoyan K.} and Maciej Paszewski and Schatz, {George C} and Grzybowski, {Bartosz A.}",
year = "2006",
month = "9",
doi = "10.1021/nl060967m",
language = "English",
volume = "6",
pages = "1896--1903",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "9",

}

TY - JOUR

T1 - Electrostatic aggregation and formation of core-shell suprastructures in binary mixtures of charged metal nanoparticles

AU - Kalsin, Alexander M.

AU - Pinchuk, Anatoliy O.

AU - Smoukov, Stoyan K.

AU - Paszewski, Maciej

AU - Schatz, George C

AU - Grzybowski, Bartosz A.

PY - 2006/9

Y1 - 2006/9

N2 - Electrostatic aggregation of oppositely charged silver and gold nanoparticles leads to the formation of core-shell clusters in which the shell is formed by the nanoparticles, which are in excess. Arguments based on Debye screening of interactions between like-charged particles help explain why these clusters are stable despite possessing net electric charge. The core-shell aggregates exhibit unusual optical properties with the resonance absorption of the shell particles enhanced by the particles in the core and that of the core suppressed by the shell. Experimental UV-vis absorption spectra are faithfully reproduced by Mie theory. The modeling allows for estimation of the numbers of particles forming the shell and of the shell's effective thickness. These theoretical predictions are substantiated by experiments using nanoparticles covered with different combinations of charged groups and performed at different values of pH.

AB - Electrostatic aggregation of oppositely charged silver and gold nanoparticles leads to the formation of core-shell clusters in which the shell is formed by the nanoparticles, which are in excess. Arguments based on Debye screening of interactions between like-charged particles help explain why these clusters are stable despite possessing net electric charge. The core-shell aggregates exhibit unusual optical properties with the resonance absorption of the shell particles enhanced by the particles in the core and that of the core suppressed by the shell. Experimental UV-vis absorption spectra are faithfully reproduced by Mie theory. The modeling allows for estimation of the numbers of particles forming the shell and of the shell's effective thickness. These theoretical predictions are substantiated by experiments using nanoparticles covered with different combinations of charged groups and performed at different values of pH.

UR - http://www.scopus.com/inward/record.url?scp=33749667994&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749667994&partnerID=8YFLogxK

U2 - 10.1021/nl060967m

DO - 10.1021/nl060967m

M3 - Article

C2 - 16967998

AN - SCOPUS:33749667994

VL - 6

SP - 1896

EP - 1903

JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

IS - 9

ER -