Formation of gold nanoparticles in diblock copolymer micelles with various reducing agents

Kinetic and thermodynamic studies

S. Papp, L. Kõrösi, B. Gool, T. Dederichs, P. Mela, M. Möller, I. Dékány

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Gold nanoparticles (Au NPs) were prepared by the reduction of HAuCl 4 acid incorporated into the polar core of poly(styrene)-block- poly(2-vinylpyridine) (PS-b-P2VP) copolymer micelles dissolved in toluene. The formation of Au NPs was controlled using three reducing agents with different strengths: hydrazine (HA), triethylsilane (TES), and potassium triethylborohydride (PTB). The formation of Au NPs was followed by transmission electron microscopy, UV-Vis spectroscopy, isothermal titration calorimetry (ITC), and dynamic light scattering (DLS). It was found that the strength of the reducing agent determined both the size and the rate of formation of the Au NPs. The average diameters of the Au NPs prepared by reduction with HA, TES, and PTB were 1.7, 2.6, and 8 nm, respectively. The reduction of Au(III) was rapid with HA and PTB. TES proved to be a mild reducing agent for the synthesis of Au NPs. DLS measurements demonstrated swelling of the PS-b-P2VP micelles due to the incorporation of HAuCl4 and the reducing agents. The original micellar structure rearranged during the reduction with PTB. ITC measurements revealed that some chemical reactions besides Au NPs formation also occurred in the course of the reduction process. The enthalpy of formation of Au NPs in PS-b-P2VP micelles reduced by HA was determined.

Original languageEnglish
Pages (from-to)865-872
Number of pages8
JournalJournal of Thermal Analysis and Calorimetry
Volume101
Issue number3
DOIs
Publication statusPublished - Sep 2010

Fingerprint

hydrazine
Reducing Agents
Micelles
Gold
Block copolymers
hydrazines
micelles
copolymers
Styrene
Thermodynamics
gold
Nanoparticles
potassium
Potassium
nanoparticles
thermodynamics
Kinetics
kinetics
polystyrene
Calorimetry

Keywords

  • Diblock copolymer
  • Gold nanoparticles
  • Heat of nucleation
  • Micellar solution
  • Microcalorimetry

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics

Cite this

Formation of gold nanoparticles in diblock copolymer micelles with various reducing agents : Kinetic and thermodynamic studies. / Papp, S.; Kõrösi, L.; Gool, B.; Dederichs, T.; Mela, P.; Möller, M.; Dékány, I.

In: Journal of Thermal Analysis and Calorimetry, Vol. 101, No. 3, 09.2010, p. 865-872.

Research output: Contribution to journalArticle

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