Fabrication of Plasmonically Active Substrates Using Engineered Silver Nanostructures for SERS Applications

Sakir, Menekse; Pekdemir, Sami; Karatay, Ahmet; Küçüköz, Betül; Ipekci, Hasan H.; Elmalı, Ayhan; Demirel, Gökhan; Önses, M. Serdar

doi:10.1021/acsami.7b12279

Cited by 45 publications

(21 citation statements)

References 41 publications

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“…This aspect, together with nanopatterning, enabled fabrication of different plasmonic heterostructures [24,25]. Several other reports [26][27][28][29][30][31][32][33] employed PEG containing thin films to immobilize and assemble citrate-stabilized gold NPs. Despite the growing interest in PEG for surface assembly of plasmonic structures, previous efforts have been limited to nanoscale building blocks consisting of spherical particles.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic assemblies of gold nanorods on nanoscale patterns of poly(ethylene glycol): Application in surface-enhanced Raman spectroscopy

Ocal

Patarroyo

Kiremitler

et al. 2018

Journal of Colloid and Interface Science

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Approaches are needed for the tailored assembly of plasmonic building blocks on the surface of substrates to synergistically enhance their properties. Here we demonstrate selective immobilization and assembly of gold nanorods (NRs) on substrates modified and patterned with end-grafted poly(ethylene glycol) (PEG) layers. The ligand exchange from the initial cetyltrimethylammonium bromide to sodium citrate was necessary for the immobilization of gold NRs onto PEG grafted substrates. Linear nanopatterns of PEG were fabricated using electrospun nanofibers as masks in oxygen plasma etching. The selective immobilization of citrate-stabilized gold NRs with a length of ∼50 nm and a width of 20 nm on the nanopatterned PEG layers led to linear and registered arrays of rods. The number of gold NRs per line depended on the width of the patterns and approached 1 when the width of the patterns was comparable to the length of the rods. The confinement of the binding regions led to a ∼3 fold increase in the number of gold NRs immobilized per unit area. The selective and dense immobilization of gold NRs on the nanoscale patterns of PEG resulted in spatially defined and strong surface-enhanced Raman scattering activity enabling detection of molecules at concentrations as low as 1 nM.

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Section: Introductionmentioning

confidence: 99%

Plasmonic assemblies of gold nanorods on nanoscale patterns of poly(ethylene glycol): Application in surface-enhanced Raman spectroscopy

Ocal

Patarroyo

Kiremitler

et al. 2018

Journal of Colloid and Interface Science

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“…Surface enhanced Raman scattering (SERS), since it was first demonstrated in 1974, has been widely studied regarding both its enhancement mechanism and enhanced properties . With the development of SERS over the past several decades, SERS substrates based on different materials, such as metal, semiconductor, and 2D material, have been designed. The various SERS substrates can be divided into two categories in terms of their surface structure: 2D and 3D substrates.…”

Section: Introductionmentioning

confidence: 99%

Constructing 3D and Flexible Plasmonic Structure for High‐Performance SERS Application

et al. 2018

Adv Materials Technologies

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provide more hot spots, which are introduced by the electromagnetic mechanism (EM). By the virtue of their larger specific surface area and periodic structure, 3D SERS substrates can effectively amplify the optical field around metal nanoparticles (NPs), thereby enhancing the Raman signal. Moreover, the 3D structure of these substrates is beneficial for the enrichment of probe molecules around metal nanoparticles; as a result, one can still obtain a high Raman signal, even under an ultralow concentration. Consequently, an increasing number of researchers are now focusing on the design and fabrication of 3D SERS substrates.To make full use of the merits of the 3D structure, SERS substrates based on 2D materials and metal nanoparticles have been combined and proposed. [23,24] In these 3D SERS substrates, the 3D structure can fully utilize the 3D focal volume of the incident beam and increase the density of the metal nanoparticles. Furthermore, introduction of the 2D material can act as an atomically thick SERS substrate, [25] perfect absorbent layer of molecules, [26] excellent sub-nanometer spacer, [27] and passivation layer for metal, [28,29] and introduce enhancements via a chemical mechanism (CM). Previously, a 3D SERS substrate based on graphene covering a pyramid-shaped Au structure was reported to achieve high enhancement. [30] While the integration of graphene and pyramid-shaped Au was successfully implemented, this 3D SERS substrate was not flexible and did not meet with the requirements when detecting probe molecules on an arbitrary curvilinear surface.Therefore, transformation of these stiff 3D substrates into flexible structures via using various methods has been investigated extensively. Leem et al. reported 3D crumpled graphene-AuNPs hybrid structures for SERS applications using a mechanical self-assembly strategy on a thermally activated polymer. [31] Similarly, Lee et al. fabricated a rippled graphene structure on a polystyrene substrate using a thermal rippling process and demonstrated the increased plasmonic coupling and higher density of the hot spots on the rippled nanostructure. [32] Kumar et al. presented a flexible SERS sensor by depositing Ag on structured polydimethylsiloxane using a Taro leaf as the template and achieved highly sensitive detection for malachite green. [33] Moreover, to fabricate a flexible 3D SERS substrate, the transfer printing technique, [34] shadow Substrate design has attracted much interest in development of an effective surface enhanced Raman scattering (SERS) sensor. A flexible SERS substrate with excellent performance needs to be sensitive to details of the preparation process; this sensitivity represents a significant challenge for practical applications as opposed to laboratory research applications. Here, a 3D flexible plasmonic structure, AgNPs@MoS 2 /pyramidal polymer (polymethyl methacrylate), is fabricated using a simple and lowcost method. Using experiments and theoretical simulations, the SERS performance of the proposed substrate is assessed in terms of ...

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“…62,68 We believe that the localized grafting from the nanoscale inkpot, along with the suppressed spreading achieved by hydrophobic surface modification, enabled the dense immobilization of Au NCs. The seed-mediated growth 73 of metallic structures over patterned Au NCs of small (<∼30 nm) diameter can enable the fabrication of continuous electrically conductive nanoscale patterns for transparent electrode applications.…”

Section: Resultsmentioning

confidence: 99%

Writing chemical patterns using electrospun fibers as nanoscale inkpots for directed assembly of colloidal nanocrystals

et al. 2020

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Fabrication of Plasmonically Active Substrates Using Engineered Silver Nanostructures for SERS Applications

Cited by 45 publications

References 41 publications

Plasmonic assemblies of gold nanorods on nanoscale patterns of poly(ethylene glycol): Application in surface-enhanced Raman spectroscopy

Plasmonic assemblies of gold nanorods on nanoscale patterns of poly(ethylene glycol): Application in surface-enhanced Raman spectroscopy

Constructing 3D and Flexible Plasmonic Structure for High‐Performance SERS Application

Writing chemical patterns using electrospun fibers as nanoscale inkpots for directed assembly of colloidal nanocrystals

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