Self-Assembled Plasmonic Nanoparticles on Vertically Aligned Carbon Nanotube Electrodes via Thermal Evaporation
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- 作者：Youngmin Kim ; Seungjae Lee ; Kyungjun Lee ; Sangdeok Shim ; Jin Young Kim ; Hyung Woo Lee ; Dukhyun Choi
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：November 26, 2014
- 年：2014
- 卷：6
- 期：22
- 页码：20423-20429
- 全文大小：431K
- ISSN：1944-8252
文摘
This study details the development of a large-area, three-dimensional (3D), plasmonic integrated electrode (PIE) system. Vertically aligned multiwalled carbon nanotube (VA-MWNT) electrodes are grown and populated with self-assembling silver nanoparticles via thermal evaporation. Due to the geometric and surface characteristics of VA-MWNTs, evaporated silver atoms form nanoparticles approximately 15鈥?0 nm in diameter. The nanoparticles are well distributed on VA-MWNTs, with a 5鈥?0 nm gap between particles. The size and gap of the self-assembled plasmonic nanoparticles is dependent upon both the length of the MWNT and the thickness of the evaporated silver. The wetting properties of water of the VA-MWNT electrodes change from hydrophilic (鈭?0掳) to hydrophobic (鈭?20掳) as a result of the evaporated silver. This effect is particularly pronounced on the VA-MWNT electrodes with a length of 1 渭m, where the contact angle is altered from an initial 8掳 to 124掳. Based on UV鈥搗isible spectroscopic analysis, plasmonic resonance of the PIE systems occurs at a wavelength of approximately 400 nm. The optical behavior was found to vary as a function of MWNT length, with the exception of MWNT with a length of 1 渭m. Using our PIE systems, we were able to obtain clear surface-enhanced Raman scattering (SERS) spectra with a detection limit of 鈭?0 nM and an enhancement factor of 鈭?06. This PIE system shows promise for use as a novel electrode system in next-generation optoelectronics such as photovoltaics, light-emitting diodes, and solar water splitting.