Synthesis of gold nanoparticles grafted with a thermoresponsive polymer by surface-induced reversible-addition-fragmentation chain-transfer polymerization

Janne Raula, Jun Shan, Markus Nuopponen, Antti Niskanen, Hua Jiang, Esko I. Kauppinen, Heikki Tenhu (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

256 Citations (Scopus)

Abstract

This work focuses on the synthesis method of Au nanoparticles protected by a well-defined polymer monolayer. Nanosized, spherical gold clusters coated with poly(N-isopropylacrylamide) (PNIPA) grafts were prepared by controlled radical polymerization. The polymerization of N-isopropylacrylamide was initiated from the surface of a gold nanoparticle modified with 4-cyanopentanoic acid dithiobenzoate for a reversible-addition-fragmentation chain-transfer polymerization. The number mean diameter of the Au core was 3.2 nm as observed by high-resolution transmission electron microscopy. The molar mass of the PNIPA ligand was 21000 g/mol by gel permeation chromatography. The changes in the surface plasmon of gold were investigated in different media, and as functions of particle concentration, as well as of temperature in aqueous solutions. The particles were soluble at least slightly in water, forming aggregates. The area and the maximum wavelength of the plasmon band in water decreased with dilution and increasing temperature. During the collapse of PNIPA ligands the surroundings of the gold surface change from hydrophilic to hydrophobic.
Original languageEnglish
Pages (from-to)3499-3504
Number of pages6
JournalLangmuir
Volume19
Issue number8
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

Fingerprint

Gold
Polymers
fragmentation
polymerization
Polymerization
gold
Nanoparticles
nanoparticles
polymers
synthesis
Ligands
ligands
gel chromatography
Water
Molar mass
Gel permeation chromatography
Free radical polymerization
High resolution transmission electron microscopy
Grafts
water

Keywords

  • gold nanoparticles
  • gold
  • nanoparticles
  • stabilization
  • polymers
  • monolayers
  • surface plasmon resonance

Cite this

Raula, Janne ; Shan, Jun ; Nuopponen, Markus ; Niskanen, Antti ; Jiang, Hua ; Kauppinen, Esko I. ; Tenhu, Heikki. / Synthesis of gold nanoparticles grafted with a thermoresponsive polymer by surface-induced reversible-addition-fragmentation chain-transfer polymerization. In: Langmuir. 2003 ; Vol. 19, No. 8. pp. 3499-3504.
@article{afbe33c1080c4b738fdf640655406805,
title = "Synthesis of gold nanoparticles grafted with a thermoresponsive polymer by surface-induced reversible-addition-fragmentation chain-transfer polymerization",
abstract = "This work focuses on the synthesis method of Au nanoparticles protected by a well-defined polymer monolayer. Nanosized, spherical gold clusters coated with poly(N-isopropylacrylamide) (PNIPA) grafts were prepared by controlled radical polymerization. The polymerization of N-isopropylacrylamide was initiated from the surface of a gold nanoparticle modified with 4-cyanopentanoic acid dithiobenzoate for a reversible-addition-fragmentation chain-transfer polymerization. The number mean diameter of the Au core was 3.2 nm as observed by high-resolution transmission electron microscopy. The molar mass of the PNIPA ligand was 21000 g/mol by gel permeation chromatography. The changes in the surface plasmon of gold were investigated in different media, and as functions of particle concentration, as well as of temperature in aqueous solutions. The particles were soluble at least slightly in water, forming aggregates. The area and the maximum wavelength of the plasmon band in water decreased with dilution and increasing temperature. During the collapse of PNIPA ligands the surroundings of the gold surface change from hydrophilic to hydrophobic.",
keywords = "gold nanoparticles, gold, nanoparticles, stabilization, polymers, monolayers, surface plasmon resonance",
author = "Janne Raula and Jun Shan and Markus Nuopponen and Antti Niskanen and Hua Jiang and Kauppinen, {Esko I.} and Heikki Tenhu",
year = "2003",
doi = "10.1021/la026872r",
language = "English",
volume = "19",
pages = "3499--3504",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "8",

}

Synthesis of gold nanoparticles grafted with a thermoresponsive polymer by surface-induced reversible-addition-fragmentation chain-transfer polymerization. / Raula, Janne; Shan, Jun; Nuopponen, Markus; Niskanen, Antti; Jiang, Hua; Kauppinen, Esko I.; Tenhu, Heikki (Corresponding Author).

In: Langmuir, Vol. 19, No. 8, 2003, p. 3499-3504.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Synthesis of gold nanoparticles grafted with a thermoresponsive polymer by surface-induced reversible-addition-fragmentation chain-transfer polymerization

AU - Raula, Janne

AU - Shan, Jun

AU - Nuopponen, Markus

AU - Niskanen, Antti

AU - Jiang, Hua

AU - Kauppinen, Esko I.

AU - Tenhu, Heikki

PY - 2003

Y1 - 2003

N2 - This work focuses on the synthesis method of Au nanoparticles protected by a well-defined polymer monolayer. Nanosized, spherical gold clusters coated with poly(N-isopropylacrylamide) (PNIPA) grafts were prepared by controlled radical polymerization. The polymerization of N-isopropylacrylamide was initiated from the surface of a gold nanoparticle modified with 4-cyanopentanoic acid dithiobenzoate for a reversible-addition-fragmentation chain-transfer polymerization. The number mean diameter of the Au core was 3.2 nm as observed by high-resolution transmission electron microscopy. The molar mass of the PNIPA ligand was 21000 g/mol by gel permeation chromatography. The changes in the surface plasmon of gold were investigated in different media, and as functions of particle concentration, as well as of temperature in aqueous solutions. The particles were soluble at least slightly in water, forming aggregates. The area and the maximum wavelength of the plasmon band in water decreased with dilution and increasing temperature. During the collapse of PNIPA ligands the surroundings of the gold surface change from hydrophilic to hydrophobic.

AB - This work focuses on the synthesis method of Au nanoparticles protected by a well-defined polymer monolayer. Nanosized, spherical gold clusters coated with poly(N-isopropylacrylamide) (PNIPA) grafts were prepared by controlled radical polymerization. The polymerization of N-isopropylacrylamide was initiated from the surface of a gold nanoparticle modified with 4-cyanopentanoic acid dithiobenzoate for a reversible-addition-fragmentation chain-transfer polymerization. The number mean diameter of the Au core was 3.2 nm as observed by high-resolution transmission electron microscopy. The molar mass of the PNIPA ligand was 21000 g/mol by gel permeation chromatography. The changes in the surface plasmon of gold were investigated in different media, and as functions of particle concentration, as well as of temperature in aqueous solutions. The particles were soluble at least slightly in water, forming aggregates. The area and the maximum wavelength of the plasmon band in water decreased with dilution and increasing temperature. During the collapse of PNIPA ligands the surroundings of the gold surface change from hydrophilic to hydrophobic.

KW - gold nanoparticles

KW - gold

KW - nanoparticles

KW - stabilization

KW - polymers

KW - monolayers

KW - surface plasmon resonance

U2 - 10.1021/la026872r

DO - 10.1021/la026872r

M3 - Article

VL - 19

SP - 3499

EP - 3504

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 8

ER -