Detailed structural examinations of covalently immobilized gold nanoparticles onto hydrogen-terminated silicon surfaces

Yoshinori Yamanoi, Naoto Shirahata, Tetsu Yonezawa, Nao Terasaki, Noritaka Yamamoto, Yoshitaka Matsui, Kazuyuki Nishio, Hideki Masuda, Yuichi Ikuhara, Hiroshi Nishihara

    Research output: Contribution to journalArticlepeer-review

    38 Citations (Scopus)

    Abstract

    The modification of flat semiconductor surfaces with nanoscale materials has been the subject of considerable interest. This paper provides detailed structural examinations of gold nanoparticles covalently immobilized onto hydrogen-terminated silicon surfaces by a convenient thermal hydrosilylation to form Si-C bonds. Gold nanoparticles stabilized by ω-alkene-1-thiols with different alkyl chain lengths (C3, C6, and C 11), with average diameters of 2-3 nm and a narrow size distribution were used. The thermal hydrosilylation reactions of these nanoparticles with hydrogen-terminated Si(111) surfaces were carried out in toluene at various conditions under N2. The obtained modified surfaces were observed by high-resolution scanning electron microscopy (HR-SEM). The obtained images indicate considerable changes in morphology with reaction time, reaction temperature, as well as the length of the stabilizing ω-alkene-1-thiol molecules. These surfaces are stable and can be stored under ambient conditions for several weeks without measurable decomposition. It was also found that the aggregation of immobilized particles on a silicon surface occurred at high temperature (> 100°C). Precise XPS measurements of modified surfaces were carried out by using a Au-S ligand-exchange technique. The spectrum clearly showed the existence of Si-C bonds. Cross-sectional HR-TEM images also directly indicate that the particles were covalently attached to the silicon surface through Si-C bonds.

    Original languageEnglish
    Pages (from-to)314-323
    Number of pages10
    JournalChemistry - A European Journal
    Volume12
    Issue number1
    DOIs
    Publication statusPublished - 2005 Dec 16

    Keywords

    • Gold
    • Nanotechnology
    • Scanning probe microscopy
    • Silicon
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Catalysis
    • Organic Chemistry

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