Preferential dewetting of gold thin films on single walled carbon nanotubes to produce nanogap electrodes

Taewoo Kim; Hyeongwook Im; Tae June Kang; Yong Hyup Kim

doi:10.1039/C6TC00824K

Preferential dewetting of gold thin films on single walled carbon nanotubes to produce nanogap electrodes

Taewoo Kim,^a Hyeongwook Im,^a Tae June Kang*^b and Yong Hyup Kim*^a

Author affiliations

* Corresponding authors

^a School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, South Korea
E-mail: yongkim@snu.ac.kr

^b Department of Mechanical Engineering, INHA University, Incheon 22212, South Korea
E-mail: tjkang@inha.ac.kr

Abstract

The morphological evolutions of Au films deposited onto (3-mercaptopropyl)trimethoxysilane (MPTMS) treated substrates with a single walled carbon nanotube (SWNT) coating were investigated during thermal annealing. The dewetting of Au films, which initiated on SWNT surfaces, formed nanosize slits along SWNTs during annealing at 150 °C for 300 s. In situ measurements of film sheet resistances and subsequent analysis revealed that the activation energy of Au films for dewetting was as low as 0.36 eV, which was much lower than that of Au films (0.43 eV) deposited on the substrate without a SWNT layer. Based on the preferential dewetting behavior of Au films on SWNTs, a novel fabrication process was devised involving dielectrophoretic deposition of SWNTs and conventional micromachining to provide nanogap electrodes. Finally, nanogap electrodes with a sub-50 nm inter-electrode spacing were successfully fabricated.

Supplementary files

Publication details

The article was received on 26 Feb 2016, accepted on 19 May 2016 and first published on 19 May 2016

Article type: Paper

DOI: 10.1039/C6TC00824K

Citation: J. Mater. Chem. C, 2016,4, 5725-5730

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Preferential dewetting of gold thin films on single walled carbon nanotubes to produce nanogap electrodes

T. Kim, H. Im, T. J. Kang and Y. H. Kim, J. Mater. Chem. C, 2016, 4, 5725
DOI: 10.1039/C6TC00824K
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Journal of Materials Chemistry C

Preferential dewetting of gold thin films on single walled carbon nanotubes to produce nanogap electrodes

Abstract

Supplementary files

Publication details

Preferential dewetting of gold thin films on single walled carbon nanotubes to produce nanogap electrodes

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