Surface-Enhanced Resonance Raman Scattering of Rhodamine 6G in Dispersions and on Films of Confeito-Like Au Nanoparticles

Ujihara, Masaki; Dang, Nhut Minh; Imae, Toyoko

doi:10.3390/s17112563

Cited by 22 publications

(10 citation statements)

References 51 publications

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“…R6G exhibited an electronic absorption maximum at 530 nm that matched the laser excitation wavelength and also lay close to the SPR of Cu NPs, and so RR effects were expected to be observed for both the bulk solid and adsorbed molecules in our study using a 532-nm laser excitation. As observed by previous researchers, the SERRS effect on Au nanoparticles or roughened Cu surfaces resulted in the appearance of the characteristic Raman peaks of the adsorbed molecules using red (632.8 nm) to blue (488 nm) excitation lines [83,84]. Our data show that the spectrum could be detected down to at least 10 −6 M, where the relative intensities were comparable to those of the bulk solid (Figure 6c).…”

Section: Resultssupporting

confidence: 88%

SERS-Active Cu Nanoparticles on Carbon Nitride Support Fabricated Using Pulsed Laser Ablation

et al. 2019

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We report a single-step route to co-deposit Cu nanoparticles with a graphitic carbon nitride (gCN) support using nanosecond Ce:Nd:YAG pulsed laser ablation from a Cu metal target coated using acetonitrile (CH3CN). The resulting Cu/gCN hybrids showed strong optical absorption in the visible to near-IR range and exhibited surface-enhanced Raman or resonance Raman scattering (SERS or SERRS) enhancement for crystal violet (CV), methylene blue (MB), and rhodamine 6G (R6G) used as probe analyte molecules adsorbed on the surface. We have characterized the Cu nanoparticles and the nature of the gCN support materials using a range of spectroscopic, structural, and compositional analysis techniques.

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Section: Resultssupporting

confidence: 88%

SERS-Active Cu Nanoparticles on Carbon Nitride Support Fabricated Using Pulsed Laser Ablation

et al. 2019

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“…Thus, fabrication of sophisticated structures on optical fiber tips has been successfully demonstrated using 2PP, with examples including micro‐optics,24–27 a miniature acoustic sensor,28 a microscale force sensor,29 and a force‐sensitive micro‐grasping tool 30. In the field of SERS, 2PP has been utilized to build polymeric templates, supports, or masks for lift‐off processes of metal layers, but these were mainly based on wafer‐scale substrates 31–36. Previously, we demonstrated the SERS effect and the potential biomedical sensing capability of some exploratory structures fabricated using 2PP on planar substrates 37.…”

Section: Introductionmentioning

confidence: 99%

Fiber‐Optic SERS Probes Fabricated Using Two‐Photon Polymerization For Rapid Detection of Bacteria

Kim

Wales

Thompson

et al. 2020

Advanced Optical Materials

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This study presents a novel fiber‐optic surface‐enhanced Raman spectroscopy (SERS) probe (SERS‐on‐a‐tip) fabricated using a simple, two‐step protocol based on off‐the‐shelf components and materials, with a high degree of controllability and repeatability. Two‐photon polymerization and subsequent metallization are adopted to fabricate a range of SERS arrays on both planar substrates and end‐facets of optical fibers. For the SERS‐on‐a‐tip probes, a limit of detection of 10−7 m (Rhodamine 6G) and analytical enhancement factors of up to 1300 are obtained by optimizing the design, geometry, and alignment of the SERS arrays on the tip of the optical fiber. Furthermore, strong repeatability and consistency are achieved for the fabricated SERS arrays, demonstrating that the technique may be suitable for large‐scale fabrication procedures in the future. Finally, rapid SERS detection of live Escherichia coli cells is demonstrated using integration times in the milliseconds to seconds range. This result indicates strong potential for in vivo diagnostic use, particularly for detection of infections. Moreover, to the best of our knowledge, this represents the first report of detection of live, unlabeled bacteria using a fiber‐optic SERS probe.

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“…Enhancement of R6G Raman signal in aqueous media observed with gold solid SERS substrates AuS2, AuS3 and AuHaS1 was very similar with AEF around 5.10 1 (Table 4). These substrates allowed to detect R6G at concentration no much lower than 10 −5 M. These results appeared quite modest compared to those (> 5.10 −6 M) observed in the literature for R6G characterization by the means of gold nanostructured solid substrates [53][54][55]. All the developed gold solid SERS substrates provided relatively reproducible SERS signal with RSD lower than 15%.…”

Section: Comparison Of the Developed Sers Substratesmentioning

confidence: 69%

Development and Comparison of Surface-Enhanced Raman Scattering Gold Substrates for In Situ Characterization of ‘Model’ Analytes in Organic and Aqueous Media

et al. 2019

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Surface-Enhanced Raman Spectroscopy (SERS) is a technique that provides high enhancement of Raman scattering from molecules adsorbed on a rough noble metal surface. The aim of this study was the development of convenient and reproducible in situ SERS methods suitable for the detection and the quantification of analytes in organic or aqueous media. For this purpose, we used a signal acquisition technique which simply consisted of recording the SERS signal in the bulk solution by using a Raman immersion probe close to the surface of the immersed solid SERS substrate. This method should be useful for on-line process analysis and more robust than conventional acquisition techniques that are generally based on a drying step which may induce heterogeneous analyte repartition onto the substrate surface, thus often requiring the use of SERS mapping technique to improve the signal reproducibility. In this study, two types of gold SERS substrates (metal nanostructures on a solid substrate and metal nanoparticles in suspension) were investigated and compared for the in situ characterization of two 'model' analytes, Rhodamine 6G (R6G) and 1,2-bis(4-pyridyl)ethylene (BPE), in aqueous and organic media. The solid substrate developed by sputtering deposition of a nanometric gold film onto a glass slide provided reproducible and stable SERS signals of BPE in organic media at concentration down to 10 −12 M. But it appeared unusable in aqueous solutions due to the removal of the gold deposit. Despite an improvement of the deposit adhesion onto the substrate by using tetraethoxysilane/(3-mercaptopropyl) trimethoxysilane sol or the use of an electroless deposition technique, the developed solid substrates did not allow to reach satisfying R6G SERS signal in aqueous solutions. Therefore, both star-like and spherical gold nanoparticles were finally developed and used as SERS substrates. After aggregation, colloids induced the best enhancement of R6G Raman signal with a possible quantification at concentrations down to 5.10 −9 M.

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Surface-Enhanced Resonance Raman Scattering of Rhodamine 6G in Dispersions and on Films of Confeito-Like Au Nanoparticles

Cited by 22 publications

References 51 publications

SERS-Active Cu Nanoparticles on Carbon Nitride Support Fabricated Using Pulsed Laser Ablation

SERS-Active Cu Nanoparticles on Carbon Nitride Support Fabricated Using Pulsed Laser Ablation

Fiber‐Optic SERS Probes Fabricated Using Two‐Photon Polymerization For Rapid Detection of Bacteria

Development and Comparison of Surface-Enhanced Raman Scattering Gold Substrates for In Situ Characterization of ‘Model’ Analytes in Organic and Aqueous Media

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