Heating-induced evolution of thiolate-encapsulated gold nanoparticles: A strategy for size and shape manipulations

Mathew M. Maye, Wenxia Zheng, Frank L. Leibowitz, Nam K. Ly, Chuan Jian Zhong

Research output: Contribution to journalArticle

328 Scopus citations

Abstract

A heating treatment strategy for inducing size and shape change of composite nanoparticles in solutions is described. The composite nanoparticles are approximately 2 nm gold cores encapsulated with alkanethiolate monolayers. The development of abilities in size and shape controls constitutes the motivation of this work. We demonstrated a remarkable evolution of the preformed particles in solutions toward monodispersed larger core sizes with well-defined and highly faceted morphologies. The particles thus evolved were encapsulated with the thiolate shells, and exhibited striking propensities of forming long-range ordered arrays. The morphological and structural evolutions were characterized using transmission electron microscopy, X-ray diffraction, UV-vis and infrared spectroscopies. Although temperature-driven crystal growth is known for nonencapsulated particles, the evolution of the thiolate-encapsulated nanoparticles in solutions into well-defined morphologies represents an intriguing example of temperature manipulations in size monodispersity and shape control.

Original languageEnglish (US)
Pages (from-to)490-497
Number of pages8
JournalLangmuir
Volume16
Issue number2
DOIs
StatePublished - Jan 25 2000
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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