One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly

Shakiela Begum, Ian P. Jones, Daniel E. Lynch, Jon A. Preece

Research output: Contribution to journalArticle

3 Citations (Scopus)
14 Downloads (Pure)

Abstract

A concentrated citrate-stabilised Au nanoparticle (NP) colloid has been prepared using a modified Frens procedure, and characterised using transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. The average diameter determined from TEM images of concentrated Au NPs (16.57?0.65nm) is similar to the diameter reported by Frens (16 nm). The surface plasmon band of the concentrated Au NPs UV-Vis spectrum has a !max at 522nm. Bare silica (‘Si’) and iron-‘Si’ hollow microsphere surfaces have been functionalised with amino groups using the surfactant 3-aminopropyltrimethoxysilane (APTMS). The Au NPs have been assembled onto the APTMS-treated hollow spheres by dispersing a colloid of Au NPs into a suspension of hollow spheres at pH 4.5 (2 h). The volume ratio of Au NPs: hollow spheres was adjusted until maximum deposition could be achieved in a single step. TEM micrographs of ultrathin (80–100nm) ultramicrotome sections through the Au NP-coated hollow spheres reveal that a single layer of Au NPs is mainly distributed on (1) the external side of the shell wall for ‘Si’ and (2) both sides of the shell wall for iron–‘Si’. UV-Vis absorption spectra of the Au NP-coated hollow spheres show that the surface plasmon band shifts (524–613nm) and broadens as the density of Au NPs is increased on the shell surface.
Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalJournal of Experimental Nanoscience
Volume7
Issue number1
Early online date17 Oct 2011
DOIs
Publication statusPublished - Jan 2012

Fingerprint

Self assembly
Nanoparticles
Silicon Dioxide
Silica
Colloids
Transmission electron microscopy
Ultraviolet spectroscopy
Microspheres
Absorption spectroscopy
Surface-Active Agents
Citric Acid
Absorption spectra
Suspensions
Surface active agents
Iron

Bibliographical note

This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Experimental Nanoscience on 17th October 2011, available online: http://www.tandfonline.com/10.1080/17458081003752962

Keywords

  • 3-aminopropyltriethoxysilane (APTMS)
  • TEM of ultramicrotome sections
  • concentrated gold nanoparticles
  • hollow spheres
  • silica and iron

Cite this

One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly. / Begum, Shakiela; Jones, Ian P.; Lynch, Daniel E.; Preece, Jon A.

In: Journal of Experimental Nanoscience, Vol. 7, No. 1, 01.2012, p. 1-16.

Research output: Contribution to journalArticle

Begum, Shakiela ; Jones, Ian P. ; Lynch, Daniel E. ; Preece, Jon A. / One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly. In: Journal of Experimental Nanoscience. 2012 ; Vol. 7, No. 1. pp. 1-16.
@article{5abef1d28cf74f8d8f4ba3e538ac16ae,
title = "One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly",
abstract = "A concentrated citrate-stabilised Au nanoparticle (NP) colloid has been prepared using a modified Frens procedure, and characterised using transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. The average diameter determined from TEM images of concentrated Au NPs (16.57?0.65nm) is similar to the diameter reported by Frens (16 nm). The surface plasmon band of the concentrated Au NPs UV-Vis spectrum has a !max at 522nm. Bare silica (‘Si’) and iron-‘Si’ hollow microsphere surfaces have been functionalised with amino groups using the surfactant 3-aminopropyltrimethoxysilane (APTMS). The Au NPs have been assembled onto the APTMS-treated hollow spheres by dispersing a colloid of Au NPs into a suspension of hollow spheres at pH 4.5 (2 h). The volume ratio of Au NPs: hollow spheres was adjusted until maximum deposition could be achieved in a single step. TEM micrographs of ultrathin (80–100nm) ultramicrotome sections through the Au NP-coated hollow spheres reveal that a single layer of Au NPs is mainly distributed on (1) the external side of the shell wall for ‘Si’ and (2) both sides of the shell wall for iron–‘Si’. UV-Vis absorption spectra of the Au NP-coated hollow spheres show that the surface plasmon band shifts (524–613nm) and broadens as the density of Au NPs is increased on the shell surface.",
keywords = "3-aminopropyltriethoxysilane (APTMS), TEM of ultramicrotome sections, concentrated gold nanoparticles, hollow spheres, silica and iron",
author = "Shakiela Begum and Jones, {Ian P.} and Lynch, {Daniel E.} and Preece, {Jon A.}",
note = "This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Experimental Nanoscience on 17th October 2011, available online: http://www.tandfonline.com/10.1080/17458081003752962",
year = "2012",
month = "1",
doi = "10.1080/17458081003752962",
language = "English",
volume = "7",
pages = "1--16",
journal = "Journal of Experimental Nanoscience",
issn = "1745-8080",
publisher = "Taylor & Francis",
number = "1",

}

TY - JOUR

T1 - One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly

AU - Begum, Shakiela

AU - Jones, Ian P.

AU - Lynch, Daniel E.

AU - Preece, Jon A.

N1 - This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Experimental Nanoscience on 17th October 2011, available online: http://www.tandfonline.com/10.1080/17458081003752962

PY - 2012/1

Y1 - 2012/1

N2 - A concentrated citrate-stabilised Au nanoparticle (NP) colloid has been prepared using a modified Frens procedure, and characterised using transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. The average diameter determined from TEM images of concentrated Au NPs (16.57?0.65nm) is similar to the diameter reported by Frens (16 nm). The surface plasmon band of the concentrated Au NPs UV-Vis spectrum has a !max at 522nm. Bare silica (‘Si’) and iron-‘Si’ hollow microsphere surfaces have been functionalised with amino groups using the surfactant 3-aminopropyltrimethoxysilane (APTMS). The Au NPs have been assembled onto the APTMS-treated hollow spheres by dispersing a colloid of Au NPs into a suspension of hollow spheres at pH 4.5 (2 h). The volume ratio of Au NPs: hollow spheres was adjusted until maximum deposition could be achieved in a single step. TEM micrographs of ultrathin (80–100nm) ultramicrotome sections through the Au NP-coated hollow spheres reveal that a single layer of Au NPs is mainly distributed on (1) the external side of the shell wall for ‘Si’ and (2) both sides of the shell wall for iron–‘Si’. UV-Vis absorption spectra of the Au NP-coated hollow spheres show that the surface plasmon band shifts (524–613nm) and broadens as the density of Au NPs is increased on the shell surface.

AB - A concentrated citrate-stabilised Au nanoparticle (NP) colloid has been prepared using a modified Frens procedure, and characterised using transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. The average diameter determined from TEM images of concentrated Au NPs (16.57?0.65nm) is similar to the diameter reported by Frens (16 nm). The surface plasmon band of the concentrated Au NPs UV-Vis spectrum has a !max at 522nm. Bare silica (‘Si’) and iron-‘Si’ hollow microsphere surfaces have been functionalised with amino groups using the surfactant 3-aminopropyltrimethoxysilane (APTMS). The Au NPs have been assembled onto the APTMS-treated hollow spheres by dispersing a colloid of Au NPs into a suspension of hollow spheres at pH 4.5 (2 h). The volume ratio of Au NPs: hollow spheres was adjusted until maximum deposition could be achieved in a single step. TEM micrographs of ultrathin (80–100nm) ultramicrotome sections through the Au NP-coated hollow spheres reveal that a single layer of Au NPs is mainly distributed on (1) the external side of the shell wall for ‘Si’ and (2) both sides of the shell wall for iron–‘Si’. UV-Vis absorption spectra of the Au NP-coated hollow spheres show that the surface plasmon band shifts (524–613nm) and broadens as the density of Au NPs is increased on the shell surface.

KW - 3-aminopropyltriethoxysilane (APTMS)

KW - TEM of ultramicrotome sections

KW - concentrated gold nanoparticles

KW - hollow spheres

KW - silica and iron

U2 - 10.1080/17458081003752962

DO - 10.1080/17458081003752962

M3 - Article

VL - 7

SP - 1

EP - 16

JO - Journal of Experimental Nanoscience

JF - Journal of Experimental Nanoscience

SN - 1745-8080

IS - 1

ER -