Multistep Deposition of
Gold Nanoparticles on Single-Walled
Carbon Nanotubes for High-Performance Transparent Conducting Films
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Abstract
We report a dual-coating method for the deposition of
gold nanoparticles
on single-walled carbon nanotubes (SWNTs) to improve the electrical
conductivities of SWNT network films. The deposition is achieved via
a two-step process: (i) pretreatment, mixing gold precursor (HAuCl<sub>4</sub>•3H<sub>2</sub>O) with a dispersion of SWNTs containing
sodium cholate or sodium dodecyl sulfate surfactants, and (ii) post-treatment,
immersion of SWNT network films functionalized with gold ions (Au<sup>3+</sup>) in a gold salt solution. SWNT films doubly hybridized with
gold nanoparticles exhibited a 20% reduced sheet resistance in comparison
with SWNT films that were post-treated with Au alone. Optical spectroscopy
and UPS results show that such enhanced electrical properties can
be attributed to additional p-type doping of the SWNTs upon treatment
with gold. These results are important for the development of efficient
transparent conducting SWNT films for optoelectronic device applications