Simple strategy to improve surface-enhanced Raman scattering based on electrochemically prepared roughened silver substrates

Kuang Hsuan Yang, Yu Chuan Liu, Chung Chin Yu

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We develop an easy and effective pathway to improve surface-enhanced Raman scattering (SERS) effects of probe molecules of Rhodamine 6G (R6G) adsorbed on electrochemically prepared roughened Ag substrates. In general SERS studies, SERS-active metal substrates are first prepared. Then probe molecules are adsorbed on them to evaluate the relative SERS effects. In this study, we employ electrochemical oxidation-reduction cycle (ORC) treatments in 0.1 M KCl solutions containing probe molecules of 2×10 -5 M R6G to prepare R6G-adsorbed SERS-active Ag substrates for one step. Encouragingly, based on this strategy, the SERS intensity of adsorbed R6G can be increased by 1 order of magnitude, as compared with that of R6G adsorbed on a roughened Ag substrate beforehand, which was generally shown in the literature. Moreover, this improved SERS effect based on this strategy is also effective for 2×10 -9 M probe molecules, which is at a level of single molecule detection based on Ag colloids. It is also effective for probe molecules of ClO 4 - with low Raman cross section and for other electrochemically prepared SERS-active substrates of Au. Further analyses indicate that the increase in SERS activity in this new method is most likely due to the incorporation of more chloride ions into the substrate.

Original languageEnglish
Pages (from-to)11512-11517
Number of pages6
JournalLangmuir
Volume26
Issue number13
DOIs
Publication statusPublished - Jul 6 2010
Externally publishedYes

Fingerprint

Silver
Raman scattering
silver
Raman spectra
rhodamine
Substrates
Molecules
probes
molecules
electrochemical oxidation
Electrochemical oxidation
Colloids
colloids
Chlorides
Metals
chlorides
rhodamine 6G
Ions
cycles
cross sections

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Simple strategy to improve surface-enhanced Raman scattering based on electrochemically prepared roughened silver substrates. / Yang, Kuang Hsuan; Liu, Yu Chuan; Yu, Chung Chin.

In: Langmuir, Vol. 26, No. 13, 06.07.2010, p. 11512-11517.

Research output: Contribution to journalArticle

@article{876410b2d6e94cb7ae1edde999085f5d,
title = "Simple strategy to improve surface-enhanced Raman scattering based on electrochemically prepared roughened silver substrates",
abstract = "We develop an easy and effective pathway to improve surface-enhanced Raman scattering (SERS) effects of probe molecules of Rhodamine 6G (R6G) adsorbed on electrochemically prepared roughened Ag substrates. In general SERS studies, SERS-active metal substrates are first prepared. Then probe molecules are adsorbed on them to evaluate the relative SERS effects. In this study, we employ electrochemical oxidation-reduction cycle (ORC) treatments in 0.1 M KCl solutions containing probe molecules of 2×10 -5 M R6G to prepare R6G-adsorbed SERS-active Ag substrates for one step. Encouragingly, based on this strategy, the SERS intensity of adsorbed R6G can be increased by 1 order of magnitude, as compared with that of R6G adsorbed on a roughened Ag substrate beforehand, which was generally shown in the literature. Moreover, this improved SERS effect based on this strategy is also effective for 2×10 -9 M probe molecules, which is at a level of single molecule detection based on Ag colloids. It is also effective for probe molecules of ClO 4 - with low Raman cross section and for other electrochemically prepared SERS-active substrates of Au. Further analyses indicate that the increase in SERS activity in this new method is most likely due to the incorporation of more chloride ions into the substrate.",
author = "Yang, {Kuang Hsuan} and Liu, {Yu Chuan} and Yu, {Chung Chin}",
year = "2010",
month = "7",
day = "6",
doi = "10.1021/la100235x",
language = "English",
volume = "26",
pages = "11512--11517",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "13",

}

TY - JOUR

T1 - Simple strategy to improve surface-enhanced Raman scattering based on electrochemically prepared roughened silver substrates

AU - Yang, Kuang Hsuan

AU - Liu, Yu Chuan

AU - Yu, Chung Chin

PY - 2010/7/6

Y1 - 2010/7/6

N2 - We develop an easy and effective pathway to improve surface-enhanced Raman scattering (SERS) effects of probe molecules of Rhodamine 6G (R6G) adsorbed on electrochemically prepared roughened Ag substrates. In general SERS studies, SERS-active metal substrates are first prepared. Then probe molecules are adsorbed on them to evaluate the relative SERS effects. In this study, we employ electrochemical oxidation-reduction cycle (ORC) treatments in 0.1 M KCl solutions containing probe molecules of 2×10 -5 M R6G to prepare R6G-adsorbed SERS-active Ag substrates for one step. Encouragingly, based on this strategy, the SERS intensity of adsorbed R6G can be increased by 1 order of magnitude, as compared with that of R6G adsorbed on a roughened Ag substrate beforehand, which was generally shown in the literature. Moreover, this improved SERS effect based on this strategy is also effective for 2×10 -9 M probe molecules, which is at a level of single molecule detection based on Ag colloids. It is also effective for probe molecules of ClO 4 - with low Raman cross section and for other electrochemically prepared SERS-active substrates of Au. Further analyses indicate that the increase in SERS activity in this new method is most likely due to the incorporation of more chloride ions into the substrate.

AB - We develop an easy and effective pathway to improve surface-enhanced Raman scattering (SERS) effects of probe molecules of Rhodamine 6G (R6G) adsorbed on electrochemically prepared roughened Ag substrates. In general SERS studies, SERS-active metal substrates are first prepared. Then probe molecules are adsorbed on them to evaluate the relative SERS effects. In this study, we employ electrochemical oxidation-reduction cycle (ORC) treatments in 0.1 M KCl solutions containing probe molecules of 2×10 -5 M R6G to prepare R6G-adsorbed SERS-active Ag substrates for one step. Encouragingly, based on this strategy, the SERS intensity of adsorbed R6G can be increased by 1 order of magnitude, as compared with that of R6G adsorbed on a roughened Ag substrate beforehand, which was generally shown in the literature. Moreover, this improved SERS effect based on this strategy is also effective for 2×10 -9 M probe molecules, which is at a level of single molecule detection based on Ag colloids. It is also effective for probe molecules of ClO 4 - with low Raman cross section and for other electrochemically prepared SERS-active substrates of Au. Further analyses indicate that the increase in SERS activity in this new method is most likely due to the incorporation of more chloride ions into the substrate.

UR - http://www.scopus.com/inward/record.url?scp=77954302510&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77954302510&partnerID=8YFLogxK

U2 - 10.1021/la100235x

DO - 10.1021/la100235x

M3 - Article

C2 - 20524629

AN - SCOPUS:77954302510

VL - 26

SP - 11512

EP - 11517

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 13

ER -