Method for the Generation of Surface-Bound Nanoparticle Density Gradients

Renee Goreham, Robert Short, Krasimir Vasilev

    Research output: Contribution to journalArticle

    46 Citations (Scopus)

    Abstract

    We report a novel, versatile method for generating number density gradients of individual gold (Au) and silver (Ag) nanoparticles by a two-step method. First, a chemical gradient of amine surface functional groups is deposited by plasma copolymerization. Second, a density gradient of nanoparticles is formed by the immersion of the chemical gradient in solutions of nanoparticles. Chemical characterization by X-ray photoelectron spectroscopy and morphological analysis by atomic force microscopy shows that nanoparticle density closely follows the change in nitrogen surface concentration across the gradients. We also demonstrate that it is possible to control the slope of the gradients by using nanoparticle solutions of different concentrations. Important for technological and research applications, this method can be used with nanoparticles of various sizes and different materials. In addition, the use of plasma deposition allows such gradients to be generated on any type of substrate.

    Original languageEnglish
    Pages (from-to)3429-3433
    Number of pages5
    JournalJournal of Physical Chemistry C
    Volume115
    Issue number8
    DOIs
    Publication statusPublished - 2011

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