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Author Hutter, E. ♦ Fendler, J. H. ♦ Roy, D.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword MATERIALS SCIENCE ♦ CRYSTALLIZATION ♦ DIELECTRIC MATERIALS ♦ MAXWELL EQUATIONS ♦ MEA ♦ PHYSICS ♦ PLASMONS ♦ RESONANCE ♦ SCANNING ELECTRON MICROSCOPY ♦ SUBSTRATES ♦ THICKNESS
Abstract Self-assembled hexanedithiol (HDT) and aminoethanethiol (AET) monolayers (SAMs), {approx}0.4--0.8 nm in thickness, are used to link {approx}5 nm diam CdS nanoparticles covalently and electrostatically onto Au and Ag substrates. The resulting nanostructures are probed with scanning electron microscopy (SEM) and surface plasmon resonance (SPR) measurements. The CdS nanoparticle--SAM--substrate interactions manifesting themselves in the dielectric functions of the multilayered systems, are detected in the SPR data, and are discussed in terms of a phenomenological six-layer model. The SPR response of the Ag substrate is more sensitive to neighboring interactions than the Au substrate. The SEM images show that the CdS, connected either by HDT or AET onto Ag substrates, forms crystalline structures. The interactions responsible for this crystallization are absent in samples employing Au substrates, in which case only {approx}5 nm diam CdS nanoparticles are detected by SEM. The experimental results of the present article, analyzed in detail using Fresnel and Maxwell equations, demonstrate how the SPR technique can be used to characterize layered nanostructured materials. {copyright} 2001 American Institute of Physics.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-15
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 90
Issue Number 4


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