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Multi-branched gold nanoparticles for Surface Enhanced Raman scattering characterization

Published online by Cambridge University Press:  19 June 2014

Jencilin Johnston
Affiliation:
Departments of Chemical Engineering and Chemistry and Chemical Biology, Northeastern University, Boston, MA
Erik N. Taylor
Affiliation:
Departments of Chemical Engineering and Chemistry and Chemical Biology, Northeastern University, Boston, MA Chemistry and Chemical Biology, Northeastern University, Boston, MA and Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia
Richard J. Gilbert
Affiliation:
Chemistry and Chemical Biology, Northeastern University, Boston, MA and Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia
Thomas J. Webster
Affiliation:
Departments of Chemical Engineering and Chemistry and Chemical Biology, Northeastern University, Boston, MA Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia
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Abstract

Surface enhanced Raman scattering (SERS) is a sensitive and reproducible vibrational spectroscopic technique used to detect and characterize molecules near the surface of noble metals like Au, Ag, Pt, Cu, etc. SERS enhances Raman signals through light-induced plasmonic vibrations occurring on irregular metal surfaces and localized electromagnetic augmentation. To better define nano-scale regions of the Raman signal enhancement, we generated gold nanoparticles with a unique multi-branched configuration along with surface-adsorbed fluorescent reporter molecules. The reporter molecules included a set of near-infra red active fluorescent dyes IR820 (green cyanine, photo electronic dye), DTTC (3, 3'-diethylthiatricarbocyanine iodide) and DTDC (3, 3'- diethylthiadicarbocyanine iodide). We employed a one-pot synthesis method in order to generate a stellate configuration in gold nanoparticles through the reduction of HAuCl4 with Good’s buffer, HEPES, at pH 7.4 and room temperature. A cell viability assay was performed with normal esophageal cells exposed to the multi-branched gold nanoparticles and SERS molecules to assess their toxicity. Our results demonstrate the capacity of multibranched gold nanoparticles linked to Raman reporter molecules to generate distinct signature spectra and, with the exception of the gold nanoparticles functionalized with DTTC, remain non-toxic to normal esophageal cells.

Type
Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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