Colloidal synthesis of air-stable crystalline germanium nanoparticles with tunable sizes and shapes

Dimitri D. Vaughn, James F. Bondi, Raymond E. Schaak

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

Nanoparticles of elemental germanium have interesting optical and electronic properties and relatively low toxicity, making them attractive materials for biological and optoelectronic applications. The most common routes to colloidal Ge nanoparticles include metathesis reactions involving Zintl salts, hydride reduction ofGe halides, and thermal decomposition of organogermane precursors. Here we describe an alternative "heat-up" method for the synthesis of size- and shape-tunableGe nanoparticles that are both crystalline and air stable. The readily available reagents GeI4, oleylamine, oleic acid, and hexamethyldisilazane are combined in one pot and heated to 260 °C, where a rapid nucleation event occurs and multifaceted nanoparticles of crystallineGe form. By varying the concentration ofGeI 4, the nanoparticle size can be tuned from 6 to 22 nm with narrow size distributions. Adding trioctylphosphine yields cubeshaped particles, and switching the solvent to octadecene yields one-dimensional nanostructures.The Ge nanoparticles, which are fully air stable for more than 6 months, were characterized by XRD, TEM, HRTEM, EDS, XPS, DRIFT, and UV-visible spectroscopy.

Original languageEnglish (US)
Pages (from-to)6103-6108
Number of pages6
JournalChemistry of Materials
Volume22
Issue number22
DOIs
StatePublished - Nov 23 2010

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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