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Raman Signal Enhancement of Rhodamine 6G on Gold Nanoparticles for Detecting Chemical Residues

Nguyen, Kien Cuong (2019) Raman Signal Enhancement of Rhodamine 6G on Gold Nanoparticles for Detecting Chemical Residues. VNU Journal of Science: Mathematics – Physics . ISSN 0866-8612 (Submitted)

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Chemical residues at lower than 10-4 M conc. has not usually been detected by a common Raman spectrometer. However, they can be detected at the lower 10-4 M conc., even up to of 10-9 M conc. when their deposition on a surface-enhanced Raman scattering (SERS) surface. In this paper, a SERS surface was prepared gold nano-particles (AuNPs) of 5nm diameter, synthesized from the HAuCl4 precursor and then was arranged as a SERS/AuNP- layer of 25nm in thickness. A Rhodamine 6G (Rh6G) dye-indicator, chosen as the SERS-probe molecules to detect the enhanced Raman amplitude, was diluted at different solution, ranging from 10-4 M to 10-9M conc. With the same 10-4 M conc. of Rh6G dye, typical Raman peaks of the Rh6G deposited on the AuNPs surface can be clearly detected while these peaks of Rh6G on a blank glass surface could not be seen. Even if, the Rh6G solution on the AuNP surface was diluted up to 10-9M conc. its typical peaks can be still detected clearly. The significant enhancement of the surface Raman signals at the different conc. of the Rh6G solution, deposited on AuNP surface, will be later discussed in the paper.

Item Type: Article
Uncontrolled Keywords: Gold nano-particles (AuNPs), surface-enhanced Raman scattering (SERS), Rhodamine 6G (Rh6G).
Subjects: Engineering Physics
Divisions: Faculty of Engineering Physics and Nanotechnology (FEPN)
Depositing User: Assoc.Prof Cuong / Kien NGUYEN
Date Deposited: 06 Dec 2019 11:45
Last Modified: 09 Dec 2019 03:46

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