期刊
ACS APPLIED NANO MATERIALS
卷 5, 期 6, 页码 7696-7703出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c00044
关键词
plasmon resonance; TiO2 nanotubes; anodizing; gold nanopores; FDTD
资金
- National Science Centre [2016/21/B/ST5/03387]
- European Union from the European Regional Development Fund under the Operational Programme Innovative Economy, 2007-2013
This study demonstrates the electrochemical and plasmonic features of gold structures grown in anodic TiO2 nanotubes. The electroreduction of Au+ species from a potassium dicyanoaurate electrolyte leads to the formation of a gold/titania interface at the outer shell of the nanotubes. This unique configuration allows for the development of a specific shape of gold nanopore array, which exhibits enhanced light absorption and scattering due to surface plasmon resonance.
The present study demonstrates the electrochemical and plasmonic features of gold structures grown in anodic TiO2 nanotubes by means of the electroreduction of Au+ species from a potassium dicyanoaurate electrolyte. The primary location of the electroreduced gold is in the gap between nanotubes, resulting in the formation of a gold/titania interface at the outer shell of the nanotubes. This unique configuration makes it possible to develop a specific shape of gold nanopore array, which is studied as a core-shell structure and standalone gold electrode after the selective dissolution of the titania matrix. Surface plasmon resonance, evaluated by finite-difference time-domain modeling, leads to strong electromagnetic fields and the consequent enhancement in light absorption and light scattering depending on the size, geometry, and composition of the nanostructure. The TiO2 nanotube core promotes light localization in air and water due to its large refractive index. Numerical analysis indicates light E-field enhancement localized on the rims of titania nanotubes of the magnitude intensity of E-2 > 100.
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