The effect of laser irradiation on surface enhanced raman scattering for silver film

Sheng, Rongsheng; Zhou, Guangming; Jian, Xiong; Xu, Zhiyuan; Morris, Michael D.; Zeng, Yanwei

doi:10.1007/bf02834925

Cited by 4 publications

(4 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to quantum mechanics, the Raman intensity of a vibrational band can be shown to be proportional to |〈 v f |(dα/d Q ) Q E⃗ | v i 〉| 2 . Thus, a variation in either the polarizibility, α, or molecular orientation relative to the electric field can lead to changes in the Raman intensity of that particular band. ,, Variations in α are normally brought about when a sample molecule undergoes a chemical or conformational change, which may be induced thermally or photolytically. ,, This implies that molecules within a SERS hot-spot have a higher chance of undergoing decomposition due to the extreme conditions of intense electric fields and localized heating there. , Hence, it should not be unexpected to see temporal changes in the Raman signal from molecules absorbed onto a SERS-active surface. Furthermore, the possibility of photo-or thermal-induced reorientations of the absorbed molecules is also favored .…”

Section: Resultsmentioning

confidence: 99%

“…3,16,25 This implies that molecules within a SERS hot-spot have a higher chance of undergoing decomposition due to the extreme conditions of intense electric fields and localized heating there. 26,27 Hence, it should not be unexpected to see temporal changes in the Raman signal from molecules absorbed onto a SERS-active surface. Furthermore, the possibility of photo-or thermal-induced reorientations of the absorbed molecules is also favored.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation into a Surface Plasmon Related Heating Effect in Surface Enhanced Raman Spectroscopy

et al. 2007

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Investigation into a Surface Plasmon Related Heating Effect in Surface Enhanced Raman Spectroscopy

et al. 2007

View full text Add to dashboard Cite

“…An underlying and often underestimated cause for these limitations is that relevant analytes are often sensitive to therm al and photolytic processes inherent to SERS. 18 Continuous irradiation of the laser beam over the SERS substrate can promote the gross decomposition or fragmentation of the sample analytes, which signi cantly broadens and reduces the intensity of observed spectral bands. Alteration of the observable bands may lead to a misinterpretation of analytical data.…”

Section: Introductionmentioning

confidence: 99%

“…Alteration of the observable bands may lead to a misinterpretation of analytical data. [18][19][20] In addition, the SERS substrate may undergo chemical or morphological changes. In Raman microscopy, these problems are sometimes compensated for by rastering the laser beam with a rotating mirror, defocusing the laser beam, or by using a neutral density lter to reduce the power of the incident beam at the surface of the SERSactive substrate.…”

Section: Introductionmentioning

confidence: 99%

Use of a Sample Translation Technique to Minimize Adverse Effects of Laser Irradiation in Surface-Enhanced Raman Spectrometry

Jesús

Giesfeldt

2003

Appl Spectrosc

View full text Add to dashboard Cite

Surface-enhanced Raman spectroscopy (SERS) has proven to be a very powerful tool in the analysis of a wide range of compounds. However, continuous irradiation of the laser beam over the SERS substrate can promote the gross decomposition of the sample analytes and significantly broaden and diminish the intensities of observed spectral bands. In addition, the incident radiation can promote thermal or photolytic fragmentation of analytes, thereby altering the observable bands and possibly leading to a misinterpretation of analytical data. Finally, chemical or morphological changes in the SERS substrate are possible. This work presents the use of a sample translation technique (STT) as a means to minimize these adverse effects. By spinning the sample rapidly, the effective residence time of analytes and substrate within the irradiated zone is dramatically decreased without reduction of spectral acquisition time or the density of analyte in the zone. The technique is studied by acquiring SERS spectra of Naproxen USP, riboflavin, folic acid, Rhodamine 6G, and 4-aminothiophenol using silver islands on glass and silver-poly(dimethylsiloxane) composite substrates under various spinning and stationary conditions. In all cases, spectra show improvements upon spinning at laser powers as low as 4.2 (+/- 0.1) mW. Specific differences in the appearance of the spectra and the potential use of STT for improved SERS qualitative and quantitative determinations are presented.

show abstract

Gold‐polymer nanocomposites: studies of their optical properties and their potential as SERS substrates

Giesfeldt

Connatser

Jesús

et al. 2005

J Raman Spectroscopy

View full text Add to dashboard Cite

Polymer-nanometallic-particle composites have demonstrated technological potential owing to their unique optical and electrical properties. In this article, we report on composites prepared via physical vapor deposition of gold metal onto pliable polydimethylsiloxane (PDMS) polymer. Rapid Au diffusion and nanometallic-particle formation in a phase-separated surface layer of the PDMS creates unique tunable sub-surface-based composites. The rate of deposition and average Au thickness can be manipulated to tune the optical properties, which are studied by visible wavelength optical extinction spectrometry and surfaceenhanced Raman scattering (SERS). DC conductivity measurements were made during Au deposition to study percolation conditions for the materials and depth profiling was performed by X-ray photoelectron spectrometry (XPS). This work presents the use of Au-PDMS nanocomposites in combination with a sample translation technique (STT) for the improved SERS qualitative and quantitative analysis. This translation approach considerably improves the reproducibility and the sensitivity of the technique by minimizing the thermal and photolytic effects inherent in SERS. The Au-PDMS nanocomposites exhibit an affinity for amine and nitro-based compounds that are biologically relevant and point toward the potential for being used as substrates for biologically based SERS experiments. Sample Raman spectra with the nanocomposite under STT-SERS conditions are included.

show abstract

The effect of laser irradiation on surface enhanced raman scattering for silver film

Cited by 4 publications

References 9 publications

Investigation into a Surface Plasmon Related Heating Effect in Surface Enhanced Raman Spectroscopy

Investigation into a Surface Plasmon Related Heating Effect in Surface Enhanced Raman Spectroscopy

Use of a Sample Translation Technique to Minimize Adverse Effects of Laser Irradiation in Surface-Enhanced Raman Spectrometry

Gold‐polymer nanocomposites: studies of their optical properties and their potential as SERS substrates

Contact Info

Product

Resources

About