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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 4
BKCSDE 32(4)
April 20, 2011 

The Characteristic Self-assembly of Gold Nanoparticles over Indium Tin Oxide (ITO) Substrate
Wan Chao Li, Sang Wha Lee *
ITO Glass, Gold nanoparticles, Diamine ligand, Chain length
Ordered array of gold nanoparticles (Au NPs) over ITO glass was investigated in terms of ITO pretreatment, particle size, and diamines with different chain length. Owing to the indium-tin-oxide (ITO) layer coated on the glass, the substrate surface has a limited number of hydroxyl groups which can produce functionalized amine groups for Au binding, which resulted in the loosely-packed array of Au NPs on the ITO surface. Diamine ligand as a molecular linker was introduced to enhance the lateral binding of adjacent Au NPs immobilized on the amine-functionalized ITO glass, consequently leading to the densely-packed array of Au NPs over the substrate. The molecular bridging effect was strengthened with the increase of chain length of diamines: C-12 > C-8 > C-4. The packing density of small Au NPs (< 40 nm) was significantly increased with the increase of diamine dosages, but large Au NPs (> 60 nm) did not produce densely-packed array on the ITO glass even for longer chain length of C-12 diamine.
1133 - 1137
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