Lithography-free synthesis of freestanding gold nanoparticle arrays encapsulated within dielectric nanowires

Wenchong Hu, Bangzhi Liu, Nicholas S. Dellas, Sarah M. Eichfeld, Suzanne E. Mohney, Joan M. Redwing, Theresa S. Mayer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


A lithography-free method for producing freestanding one-dimensional gold nanoparticle arrays encapsulated within silicon dioxide nanowires is reported. Silicon nanowires grown by the vapor-liquid-solid technique with diameters ranging from 20 nm to 50 nm were used as the synthesis template. The gold nanoparticle arrays were obtained by coating the surface of the silicon nanowires with a 10 nm gold film, followed by thermal oxidation in an oxygen ambient. It was found that the thermal oxidation rate of the silicon nanowires was significantly enhanced by the presence of the gold thin film, which fully converted the silicon into silicon dioxide. The gold-enhanced oxidation process forced the gold into the core of the wire, forming a solid gold nanowire core surrounded by a silicon dioxide shell. Subsequent thermal treatment resulted in the fragmentation of the gold nanowire into a uniformly spaced array of gold nanoparticles encapsulated by a silicon dioxide shell, which was observed by in situ annealing in transmission electron microscopy. Analysis of many different silicon nanowire diameters shows that the diameter and spacing of the gold nanopaticles follows the Rayleigh instability, which confirms this is the mechanism responsible for formation of the nanoparticle array.

Original languageEnglish (US)
Title of host publicationQuantum Dots and Nanostructures
Subtitle of host publicationSynthesis, Characterization, and Modeling VII
StatePublished - 2010
EventQuantum Dots and Nanostructures: Synthesis, Characterization, and Modeling VII - San Francisco, CA, United States
Duration: Jan 24 2010Jan 27 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherQuantum Dots and Nanostructures: Synthesis, Characterization, and Modeling VII
Country/TerritoryUnited States
CitySan Francisco, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Lithography-free synthesis of freestanding gold nanoparticle arrays encapsulated within dielectric nanowires'. Together they form a unique fingerprint.

Cite this