Resonant tip-enhanced Raman scattering by CdSe nanocrystals on plasmonic substrates

Milekhin, Ilya; Rahaman, Mahfujur; Anikin, K. V.; Rodyakina, E. E.; Duda, T. A.; Saidzhonov, Bedil M.; Vasiliev, R. B.; Dzhagan, Volodymyr; Milekhin, A. G.; Латышев, А. В.; Zahn, Dietrich R. T.

doi:10.1039/d0na00554a

Cited by 7 publications

(11 citation statements)

References 58 publications

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“…Here, it is even more evident that the maximum TERS enhancement originates from the edge of the nanodiscs, demonstrating good agreement with the current simulation results. Furthermore, our previous study also confirmed qualitatively the result from the 2D simulation [ 3 , 55 ]. However, we performed a detailed systematic computational study in the present investigation and report the influence of the coupling behaviour between the tip and the plasmonic substrate on TERS sensitivity, which is missing in the previous work [ 3 , 55 ].…”

Section: Resultssupporting

confidence: 86%

“…Furthermore, our previous study also confirmed qualitatively the result from the 2D simulation [3,55]. However, we performed a detailed systematic computational study in the present investigation and report the influence of the coupling behaviour between the tip and the plasmonic substrate on TERS sensitivity, which is missing in the previous work [3,55]. excitation of 638 nm are shown in Figure 6.…”

Section: Experimental Results and 3d Simulationsupporting

confidence: 85%

“…In our previous work, we demonstrated experimentally that edges of nanostructures can produce even stronger TERS sensitivity [ 3 , 53 , 54 , 55 ]. Therefore, the nanostructured substrate configuration was further tested to understand how the dimension of the nanostructure influences the TERS sensitivity when the tip is located at the edges.…”

Section: Resultsmentioning

confidence: 99%

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Understanding the Role of Different Substrate Geometries for Achieving Optimum Tip-Enhanced Raman Scattering Sensitivity

Rahaman

Madeira

et al. 2021

Nanomaterials

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Tip-enhanced Raman spectroscopy (TERS) has experienced tremendous progress over the last two decades. Despite detecting single molecules and achieving sub-nanometer spatial resolution, attaining high TERS sensitivity is still a challenging task due to low reproducibility of tip fabrication, especially regarding very sharp tip apices. Here, we present an approach for achieving strong TERS sensitivity via a systematic study of the near-field enhancement properties in the so-called gap-mode TERS configurations using the combination of finite element method (FEM) simulations and TERS experiments. In the simulation study, a gold tip apex is fixed at 80 nm of diameter, and the substrate consists of 20 nm high gold nanodiscs with diameter varying from 5 nm to 120 nm placed on a flat extended gold substrate. The local electric field distributions are computed in the spectral range from 500 nm to 800 nm with the tip placed both at the center and the edge of the gold nanostructure. The model is then compared with the typical gap-mode TERS configuration, in which a tip of varying diameter from 2 nm to 160 nm is placed in the proximity of a gold thin film. Our simulations show that the tip-nanodisc combined system provides much improved TERS sensitivity compared to the conventional gap-mode TERS configuration. We find that for the same tip diameter, the spatial resolution achieved in the tip-nanodisc model is much better than that observed in the conventional gap-mode TERS, which requires a very sharp metal tip to achieve the same spatial resolution on an extended metal substrate. Finally, TERS experiments are conducted on gold nanodisc arrays using home-built gold tips to validate our simulation results. Our simulations provide a guide for designing and realization of both high-spatial resolution and strong TERS intensity in future TERS experiments.

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Section: Resultssupporting

confidence: 86%

Section: Experimental Results and 3d Simulationsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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Understanding the Role of Different Substrate Geometries for Achieving Optimum Tip-Enhanced Raman Scattering Sensitivity

Rahaman

Madeira

et al. 2021

Nanomaterials

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“…As one of the main applications of Au NPs is surface-enhanced Raman scattering of low quantities of organic molecules [1] and inorganic nanostructures [34], we performed a preliminary test of the new synthesized NPs as a SERS substrate for detection of a low concentration of popular analytes. In particular, we observed enhancement for crystal violet (Fig.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic Colloidal Au Nanoparticles in DMSO: A Facile Synthesis and Characterisation

Dzhagan

Kapush

Plokhovska

et al. 2022

Preprint

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We report a new pathway for the synthesis of plasmonic gold nanoparticles (Au NPs) in a bio-compatible medium. A modified room temperature approach based on the standard Turkevich synthesis, using sodium citrate as a reducing and stabilizing agent, results in highly stable “colloidal” suspension of Au NPs in dimethyl sulfoxide (DMSO). The mean NP size of about 15 nm with fairly low size distribution is revealed by scanning electron microscopy. The stability test through UV-vis absorption spectroscopy indicates no sign of aggregation for months. The Au NPs are also characterized by X-ray photoelectron, Raman scattering, and FTIR spectroscopies. The stabilisation mechanism of the Au NPs in DMSO is concluded to be similar to that of NPs synthesized in water. The Au NPs obtained in this work are applicable as SERS substrates, as proved by common analytes. In terms of bio-applications, they do not possess such side effect as pronounced antibacterial activity, based on the tests performed on non-pathogenic Gram-positive or Gram-negative bacteria.

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“…Colloidal CdSe NCs dissolved in a toluene solution with a concentration of 10 −3 M, mixed with a solution of behenic acid in a molar ratio of 1-3: 1, were then used for homogeneous deposition onto plasmonic substrates with various morphologies (nanodisks, nanodimers, and Klarite substrates) by the Langmuir-Blodgett (LB) method, as described in [41,42]. Mono-and submonolayers of colloidal bare CdSe NCs were formed by varying the number of behenic monolayers as described in detail earlier in [43,44]. After the deposition of CdSe NCs within a matrix of behenic acid, the samples were annealed at 150 • C to remove the organic molecules of behenic acid.…”

Section: Methods Of Synthesis and Deposition Processes Of Cdse Ncsmentioning

confidence: 99%

Surface- and Tip-Enhanced Raman Scattering by CdSe Nanocrystals on Plasmonic Substrates

Milekhin

Zahn

2022

Nanomaterials

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This work presents an overview of the latest results and new data on the optical response from spherical CdSe nanocrystals (NCs) obtained using surface-enhanced Raman scattering (SERS) and tip-enhanced Raman scattering (TERS). SERS is based on the enhancement of the phonon response from nanoobjects such as molecules or inorganic nanostructures placed on metal nanostructured substrates with a localized surface plasmon resonance (LSPR). A drastic SERS enhancement for optical phonons in semiconductor nanostructures can be achieved by a proper choice of the plasmonic substrate, for which the LSPR energy coincides with the laser excitation energy. The resonant enhancement of the optical response makes it possible to detect mono- and submonolayer coatings of CdSe NCs. The combination of Raman scattering with atomic force microscopy (AFM) using a metallized probe represents the basis of TERS from semiconductor nanostructures and makes it possible to investigate their phonon properties with nanoscale spatial resolution. Gap-mode TERS provides further enhancement of Raman scattering by optical phonon modes of CdSe NCs with nanometer spatial resolution due to the highly localized electric field in the gap between the metal AFM tip and a plasmonic substrate and opens new pathways for the optical characterization of single semiconductor nanostructures and for revealing details of their phonon spectrum at the nanometer scale.

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Resonant tip-enhanced Raman scattering by CdSe nanocrystals on plasmonic substrates

Abstract: Tip-enhanced Raman scattering (TERS) has recently emerged as a powerful technique for studying local properties of low dimensional materials. Being a plasmon driven system, a dramatic enhancement of the TERS...

Cited by 7 publications

References 58 publications

Understanding the Role of Different Substrate Geometries for Achieving Optimum Tip-Enhanced Raman Scattering Sensitivity

Understanding the Role of Different Substrate Geometries for Achieving Optimum Tip-Enhanced Raman Scattering Sensitivity

Plasmonic Colloidal Au Nanoparticles in DMSO: A Facile Synthesis and Characterisation

Surface- and Tip-Enhanced Raman Scattering by CdSe Nanocrystals on Plasmonic Substrates

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