Self-Assembling of Gold Nanoparticles Coated With Silica Layer and Their Electric Properties

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Gold nanoparticles coated with a silica layer, which has successfully been controlled in layer thickness, were self-assembled on poly(diallyldimethylammoniumchloride) (PDDA) coupling glass substrate. Gold particles with about 30 nm in diameter are at first prepared by the thermal-reduction method using citrate, and then by addition of 3-aminopropyltrimethoxysilane (APTMS) and subsequently a sodium silicate solution, a silica layer surrounding the gold particles is formed. The thickness of silica layer was controlled up to 8 nm by a variety of the aging periods of the solution. The electric properties of single silica-coated gold nanoparticles with different silica thickness are measured utilizing atomic force microscope (AFM) in vacuum. Their current-voltage (I-V) curves show clear zero current regions due to Coulomb blockade. The width of the region, Coulomb gap, increases with an increase in the thickness of silica layer surrounding gold nanoparticle.
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