Laser Raman Spectroscopy with Different Excitation Sources and Extension to Surface Enhanced Raman Spectroscopy

Wahadoszamen,; Rahaman, Arifur; Hoque, Nabil Md Rakinul; Talukder, Aminul I.; Abedin, Kazi Monowar; Haider, A. F. M. Y.

doi:10.1155/2015/895317

Cited by 38 publications

(26 citation statements)

References 13 publications

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“…S5 †). 54,69,70 The observed scattered frequencies are also in very good agreement with the modes reported for RhD6G. 68 In this case, the observed signal enhancement is certainly not due to plasmon coupling since the thin lms did not present any surface plasmon resonances as veried by diffuse reectance electronic spectroscopy (see ESI, Fig.…”

Section: Resultssupporting

confidence: 76%

Tailoring gold and silver colloidal bimetallic nanoalloys towards SERS detection of rhodamine 6G

et al. 2017

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Section: Resultssupporting

confidence: 76%

Tailoring gold and silver colloidal bimetallic nanoalloys towards SERS detection of rhodamine 6G

et al. 2017

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“…The Raman spectrum was obtained for the liquid sample under the following conditions: 400 Hz, duty ratio of 10%, and 20,000 ms integral time. Figure 6a illustrates the baseline corrected Raman spectrum of benzene, and Table 1 provides data on the major peaks of the known Raman peaks of benzene 21 . The spectrum shows a difference of up to 6 cm −1 compared with known Raman peaks.…”

Section: Resultsmentioning

confidence: 99%

Fabricating a Raman spectrometer using an optical pickup unit and pulsed power

Cho

Ahn

2020

Sci Rep

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Young chai cho & Sung il Ahn * Although Raman spectroscopy is a major analytical tool in modern chemical experiments, commercial Raman spectrometers remain very pricey for educational and research purposes in individual university laboratories. thus, this study focused on the structural similarity between the Raman spectrometer and an optical pickup unit (opU), which is an inexpensive compact optical device used for a part of optical discs. the study investigated whether or not a full set of Raman spectrometer can be developed at a cost of less than 1,000 US$. The OPU-based Raman spectrometer was fabricated using 3D printer-made components, a Raman edge filter, and a laser diode with a wavelength of 520 nm as the light source. A function generator was used as a pulsed power source to analyze the characteristics of the opU Raman spectrometer according to various frequencies and duty ratios. When using a pulsed DC power supply, the laser wavelength tended to move to a longer wavelength with increases in duty ratios. that is, the higher the frequency at the same duty ratio, the weaker the background light intensity compared with the scattered Raman signal intensity. The findings illustrate that Raman signal strength can be adjusted by adjusting the focal length of the objective lens of the OPU through an external adjustment of an additional DC power. In the Raman spectra of all solid and liquid samples used, the maximum error rate reached approximately 11 cm −1 , whereas the maximum intensity deviation reached approximately ± 6%. The cost of the complete OPU Raman spectrometer is less than 1,100 US$ using a function generator as power source and less than 930 US$ using a DC adapter. If the optical density (OD) 6 filter can be replaced with the OD 4 filter, then the costs are expected to decrease to approximately 730 US$. Raman spectrometers are very powerful tools used for the simple and rapid identification of chemical species in chemical-related laboratories. In particular, it is considered one of the essential spectroscopic methods along with the research and development of low-dimensional carbon compounds, such as carbon nanotubes, graphene, and carbon dots 1-6. Since C. V. Raman discovered Raman scattering in 1928 7 , various Raman spectrometers have been developed after extensive research and improvement. Light scattering can be classified into Mie and Rayleigh scatterings dependent on the size of scattering materials 8. Mie scattering is a phenomenon in which the light of all colors is scattered evenly regardless of the wavelength due to particle sizes that are larger than the incident wavelengths of lights. When the size of the scattering matter is much smaller than the wavelength of light, the difference lies in the degree of scattering according to the wavelength of the incident light. The second form, namely, Rayleigh scattering, causes the sky to appear blue. Most photon incidents on a molecule undergo Rayleigh scattering at the same wavelength as the incident light. However, a few photons scatter inelas...

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“…All the Raman spectroscopic investigations reported in this study were performed on a modified dispersive Laser Raman system, and unlike the one we reported earlier (Wahadoszamen et al, 2015), this Laser Raman system was constructed with a spectrograph coupled to an intensified CCD (ICCD) camera. Therefore, to optimize and ensure the newly configured and modified Raman system's reliability, we first carried out the Raman protocols on different substances that have well-recognized Raman signals (like Benzene, Aniline, and Chlorobenzene).…”

Section: Resultsmentioning

confidence: 99%

Economically reproducible surface-enhanced Raman spectroscopy of different compounds in thin film

Islam

Tasneem

Khan

et al. 2021

J Bangladesh Acad Sci

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We report herein an economically cheap and functionally stable surfaceenhanced Raman scattering (SERS) protocol of two photoactive pigments Rhodamine 6G (R6G) and Kiton Red (KR), implemented in thin films of silver (Ag) and gold (Au) nanoparticles (AgNPs and AuNPs). Both commercially available and chemically synthesized nanoparticles were used. The suitability of the nanoparticles toward SERS activity was tested through UV-visible absorption spectroscopy and scanning electron microscopy (SEM). The AgNPs and AuNPs based SERS substrates in the form of films were fabricated onto square-sized aluminum(Al) plates by simple drop deposition of colloidal nanoparticles solution onto their polished surfaces. The prepared nanoparticle films were sufficiently dried and coated further with the probe (R6G and KR) molecules by employing the identical deposition technique. The enhanced Raman signals of R6G and KR in such composite film structures were then recorded through a custom-built dispersive Raman spectrometer with He-Ne laser excitation at 632.8 nm. Our AgNPsfilm-based SERS protocol could yield the magnitude of the Raman signal enhancement up to 104 times for both R6G and KR. Moreover, AuNPs-based film was found to be less efficient toward the Raman enhancement of both compounds. Our SERS substrates can be easily fabricated, and SERS spectra are reproducible and stable, allowing one to consistently get a reproducible result even after 6 months. J. Bangladesh Acad. Sci. 45(1); 1-11: June 2021

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Laser Raman Spectroscopy with Different Excitation Sources and Extension to Surface Enhanced Raman Spectroscopy

Cited by 38 publications

References 13 publications

Tailoring gold and silver colloidal bimetallic nanoalloys towards SERS detection of rhodamine 6G

Tailoring gold and silver colloidal bimetallic nanoalloys towards SERS detection of rhodamine 6G

Fabricating a Raman spectrometer using an optical pickup unit and pulsed power

Economically reproducible surface-enhanced Raman spectroscopy of different compounds in thin film

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