Low concentration rhodamine 6G observed by surface-enhanced Raman scattering on optimally electrochemically roughened silver substrates

Liu, Yu Chuan; Yu, Chih-Chang; Sheu, Sen F.

doi:10.1039/b609417a

Cited by 63 publications

(52 citation statements)

References 34 publications

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“…Raman signal of R6G has been demonstrated at this concentration level, [15,16,27] and even lower concentrations have been detected. [28] However, the sensitivity of a biosensor can also be influenced by the incubation conditions and the measurement parameters. Additional techniques, such as stirring the analyte or increasing the incubation duration, could enhance the mass transport between the analyte and the sensor area and improve the sensor performance.…”

Section: Resultsmentioning

confidence: 99%

Glass‐embedded silver nanoparticle patterns by masked ion‐exchange process for surface‐enhanced Raman scattering

Chen

Jaakola

Säynätjoki

et al. 2010

J Raman Spectroscopy

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Glass-embedded silver nanoparticle patterns were fabricated by masked silver-sodium ion-exchange process followed by etching to reveal the particles for surface-enhanced Raman scattering (SERS). The intensity of the enhanced Raman signal is comparable to that of the fluorescence, and the detection limit of 1 nM for Rhodamine 6G has been achieved. Raman images at different etching depths and corresponding morphological images are compared to find optimal SERS signal. Our results demonstrate that silver nanoparticle patterns embedded in glass can be used as SERS-active substrates. Nanoparticles can be formed in a glass of high optical quality and have potential to be integrated with optical waveguides for a sensor chip.

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Section: Resultsmentioning

confidence: 99%

Glass‐embedded silver nanoparticle patterns by masked ion‐exchange process for surface‐enhanced Raman scattering

Chen

Jaakola

Säynätjoki

et al. 2010

J Raman Spectroscopy

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“…Figure 1(A) shows the surface morphology of the Au substrate roughened in 0.1-N HCl that exhibits thin metal islands with a microstructure of <100 nm size. [13,14] This would be responsible for a good Raman activity. Comparing this morphology with that of UPD Ag-modified Au shown in Fig.…”

Section: Characteristics Of Upd Ag-modified Au Substratesmentioning

confidence: 99%

Enhancements in intensity and thermal stability of Raman spectra based on roughened gold substrates modified by underpotential deposition of silver

Liu

Yang

Hsu

2009

J Raman Spectroscopy

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In this study, electrochemically roughened gold is modified with underpotential deposition (UPD) silver to investigate the effects on enhancements in the intensity and the thermal stability of surface-enhanced Raman scattering (SERS). The SERS of Rhodamine 6G (R6G) adsorbed on the UPD Ag-modified Au substrate exhibits a higher intensity by six-fold of magnitude, as compared with that of R6G adsorbedon the unmodified Au substrate. Moreover, the SERS enhancement capabilities of UPD Ag-modified Au and unmodified Au substrates are seriously depressed at temperatures higher than 200 and 150 • C, respectively. It indicates that the modification of UPD Ag can significantly depress the thermal destruction of SERS-active substrates.

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“…Extensive investigations have demonstrated that the SERS enhancements of nanostructured Au and Ag strongly rely on their morphology, size, and assembly, and various nanostructured Au and Ag have been developed as sensitive SERS substrates. [17][18][19][20][21][22] However, amongst the three coinage metals, the SERS effect of nanostructured Cu is much less investigated. [23,24] This is probably due to their insignificant SERS effects and poor thermal and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Copper with Tunable Nanoporosity for SERS Applications

Chen

Fujita

et al. 2009

Adv Funct Materials

348

271

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Nanostructured materials with designable microstructure and controllable physical and chemical properties are highly desired for practical applications in nanotechnology. In this article, it is reported that nanoporous copper with a tunable nanopore size can be fabricated by controlling the dealloying process. The influence of acid concentration and etching potential on the formation of nanoprosity is systematically investigated. With optimal etching conditions, the nanopore sizes can be tailored from ∼15 to ∼120 nm by controlling the dealloying time. It is found that the tunable nanoporosity leads to significant improvements in surface‐enhanced Raman scattering (SERS) of nanoporous copper and peak values of SERS enhancements for both rhodamine 6G and crystal violet 10B molecules are observed at a pore size of ∼30–50 nm. This study underscores the effect of complex three‐dimensional nanostructures on physical and chemical properties and is helpful in developing inexpensive SERS substrates for sensitive instrumentations in molecular diagnostics.

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Low concentration rhodamine 6G observed by surface-enhanced Raman scattering on optimally electrochemically roughened silver substrates

Cited by 63 publications

References 34 publications

Glass‐embedded silver nanoparticle patterns by masked ion‐exchange process for surface‐enhanced Raman scattering

Glass‐embedded silver nanoparticle patterns by masked ion‐exchange process for surface‐enhanced Raman scattering

Enhancements in intensity and thermal stability of Raman spectra based on roughened gold substrates modified by underpotential deposition of silver

Nanoporous Copper with Tunable Nanoporosity for SERS Applications

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