Electrochemical approach to and the physical consequences of preparing nanostructures from gold nanorods with smooth ends

Matthew J. Banholzer, Shuzhou Li, Jacob B. Ketter, Dorota I. Rozkiewicz, George C Schatz, Chad A. Mirkin

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We have developed a method to smooth the end sections of nanowires and nanogaps generated via the On-Wire Lithography process and studied these rods with optical spectroscopies and theoretical modeling (Discrete Dipole Approximation). The first step of the smoothing process is a reductive one aimed at controlling the diffusion and migration of metal ions to the growing nanorod surface by adjusting the applied potential and concentration of the metal ions in the growth solution. A second oxidative smoothing step, based in part on the energetic differences between topologically rough and smooth surfaces, is used to further smooth the nanorod. The rms roughness can be reduced over 5-fold to approximately 5 nm. The properties of these smoothed rods were investigated by empirical and theoretical methods, where it was found that smoothed rods have sharper plasmon resonances and decreased SERS intensity.

Original languageEnglish
Pages (from-to)15729-15734
Number of pages6
JournalJournal of Physical Chemistry C
Volume112
Issue number40
DOIs
Publication statusPublished - Oct 9 2008

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Nanorods
Gold
nanorods
Metal ions
Nanostructures
rods
gold
smoothing
metal ions
Lithography
Nanowires
Surface roughness
Wire
nanowires
roughness
lithography
adjusting
wire
dipoles
approximation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Electrochemical approach to and the physical consequences of preparing nanostructures from gold nanorods with smooth ends. / Banholzer, Matthew J.; Li, Shuzhou; Ketter, Jacob B.; Rozkiewicz, Dorota I.; Schatz, George C; Mirkin, Chad A.

In: Journal of Physical Chemistry C, Vol. 112, No. 40, 09.10.2008, p. 15729-15734.

Research output: Contribution to journalArticle

Banholzer, Matthew J. ; Li, Shuzhou ; Ketter, Jacob B. ; Rozkiewicz, Dorota I. ; Schatz, George C ; Mirkin, Chad A. / Electrochemical approach to and the physical consequences of preparing nanostructures from gold nanorods with smooth ends. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 40. pp. 15729-15734.
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