Thermal behavior and film formation from an organogermanium polymer/nanoparticle precursor

Hsiang Wei Chiu, Susan M. Kauzlarich, Eli Sutter

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In situ high-resolution transmission electron microscopy (HRTEM) was used to investigate the effect of heating on an organo-Ge polymer/nanoparticle composite material containing 4-8 nm diameter alkyl-terminated Ge nanoparticles. The product was obtained from the reduction of GeCl 4 with Na(naphthalide) with subsequent capping of the -Cl surface with n-butyl Grignard reagent. The in situ HRTEM micrographs show that the product undergoes significant changes upon heating from room temperature to 600°C. Two pronounced effects were observed: (i) Ge nanoparticles coalesce and remain crystalline throughout the entire temperature range, and (ii) the organo-Ge polymer acts as a source for the in situ formation of additional Ge nanoparticles. The in situ-formed Ge nanoparticles are approximately 2-3 nm in diameter. These in situ-formed nanoparticles (2-3 nm) are so dense that, together with the original ones, they build up an almost continuous crystalline film in the temperatures between 300 and 500°C. Above 480°C, melting of the in situ formed Ge nanoparticles (2-3 nm) is observed, while nanoparticles greater than 5 nm remain crystalline. After cooling to room temperature, the 2-3 nm Ge nanoparticles recrystallized.

Original languageEnglish (US)
Pages (from-to)5455-5458
Number of pages4
JournalLangmuir
Volume22
Issue number12
DOIs
StatePublished - Jun 6 2006

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Polymers
Nanoparticles
nanoparticles
polymers
High resolution transmission electron microscopy
Crystalline materials
Hot Temperature
Heating
Temperature
transmission electron microscopy
heating
high resolution
room temperature
products
reagents
Melting
melting
Cooling
cooling
composite materials

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Thermal behavior and film formation from an organogermanium polymer/nanoparticle precursor. / Chiu, Hsiang Wei; Kauzlarich, Susan M.; Sutter, Eli.

In: Langmuir, Vol. 22, No. 12, 06.06.2006, p. 5455-5458.

Research output: Contribution to journalArticle

Chiu, Hsiang Wei ; Kauzlarich, Susan M. ; Sutter, Eli. / Thermal behavior and film formation from an organogermanium polymer/nanoparticle precursor. In: Langmuir. 2006 ; Vol. 22, No. 12. pp. 5455-5458.
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