Identification and characterization of active and inactive species for surface-enhanced resonance Raman scattering

I. Khan, D. Cunningham, D. Graham, D.W. McComb, W.E. Smith

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The surface-enhanced resonance Raman scattering (SERRS) activity of a statistically significant number of silver nanoparticles has been studied using a correlated SERRS mapping and transmission electron microscopy (TEM) method. TEM allowed the nature of each entity to be directly identified, and the SERRS activity was obtained from the corresponding SERRS map. Particles in various states of aggregation were analyzed to establish relative activities. It was established that SERRS activity is dependent on the specific batch of colloid tested. By averaging different colloid batches, it was shown that increasing SERRS activity is observed with increasing numbers of particles in the aggregates. By reducing the surface coverage of the particles to the extent that single moieties could be examined optically, the ratio of the relative activities of single particles, dimers, trimers, and larger aggregates was estimated. High-resolution TEM images of a number of active and inactive particles are reported. However, no clear correlation between microstructure and SERRS activity was observed.
LanguageEnglish
Pages3454-3459
Number of pages5
JournalJournal of Physical Chemistry B
Volume109
Issue number8
DOIs
Publication statusPublished - 3 Mar 2005

Fingerprint

resonance scattering
Raman scattering
Raman spectra
Colloids
transmission electron microscopy
colloids
Transmission electron microscopy
High resolution transmission electron microscopy
trimers
Silver
Dimers
Thermodynamic properties
Agglomeration
silver
dimers
Nanoparticles
nanoparticles
microstructure
Microstructure
high resolution

Keywords

  • rhodamine 6g molecules
  • large as nanocrystals
  • single-molecule
  • spectroscopy
  • nanoparticles
  • particles
  • junctions
  • silver
  • gold

Cite this

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abstract = "The surface-enhanced resonance Raman scattering (SERRS) activity of a statistically significant number of silver nanoparticles has been studied using a correlated SERRS mapping and transmission electron microscopy (TEM) method. TEM allowed the nature of each entity to be directly identified, and the SERRS activity was obtained from the corresponding SERRS map. Particles in various states of aggregation were analyzed to establish relative activities. It was established that SERRS activity is dependent on the specific batch of colloid tested. By averaging different colloid batches, it was shown that increasing SERRS activity is observed with increasing numbers of particles in the aggregates. By reducing the surface coverage of the particles to the extent that single moieties could be examined optically, the ratio of the relative activities of single particles, dimers, trimers, and larger aggregates was estimated. High-resolution TEM images of a number of active and inactive particles are reported. However, no clear correlation between microstructure and SERRS activity was observed.",
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Identification and characterization of active and inactive species for surface-enhanced resonance Raman scattering. / Khan, I.; Cunningham, D.; Graham, D.; McComb, D.W.; Smith, W.E.

In: Journal of Physical Chemistry B, Vol. 109, No. 8, 03.03.2005, p. 3454-3459.

Research output: Contribution to journalArticle

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T1 - Identification and characterization of active and inactive species for surface-enhanced resonance Raman scattering

AU - Khan, I.

AU - Cunningham, D.

AU - Graham, D.

AU - McComb, D.W.

AU - Smith, W.E.

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AB - The surface-enhanced resonance Raman scattering (SERRS) activity of a statistically significant number of silver nanoparticles has been studied using a correlated SERRS mapping and transmission electron microscopy (TEM) method. TEM allowed the nature of each entity to be directly identified, and the SERRS activity was obtained from the corresponding SERRS map. Particles in various states of aggregation were analyzed to establish relative activities. It was established that SERRS activity is dependent on the specific batch of colloid tested. By averaging different colloid batches, it was shown that increasing SERRS activity is observed with increasing numbers of particles in the aggregates. By reducing the surface coverage of the particles to the extent that single moieties could be examined optically, the ratio of the relative activities of single particles, dimers, trimers, and larger aggregates was estimated. High-resolution TEM images of a number of active and inactive particles are reported. However, no clear correlation between microstructure and SERRS activity was observed.

KW - rhodamine 6g molecules

KW - large as nanocrystals

KW - single-molecule

KW - spectroscopy

KW - nanoparticles

KW - particles

KW - junctions

KW - silver

KW - gold

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