One-step synthesis of a monolayer of monodisperse gold nanocubes for SERS substrates

Omar, Rana; Naciri, A. En; Jradi, Safi; Battie, Yann; Toufaily, Joumana; Mortada, Hussein; Akil, Suzanna

doi:10.1039/c7tc03069j

Cited by 46 publications

(52 citation statements)

References 44 publications

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“…In this paper, we fabricated a desirable 3D flexible and transparent SERS microstructure with excellent enhancement, good stability and homogeneity, and high reproducibility using polymethyl methacrylate (PMMA) as flexible polymer substrate and pyramidal Si as the template. PMMA has been widely used as a SERS substrate because it is a low‐cost substrate that is intrinsically flexible and transparent, chemically stable, and nontoxic . Pyramidal Si, which has a large specific surface area and periodic construction, has been demonstrated to be an amplifier of the optical field around metal nanoparticles, especially in the field of plasmonics .…”

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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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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“…The physical and chemical properties of AuNPs are shape-dependent [13]. Numerous AuNP morphologies have been reported, such as nanospheres [14], nanocubes [15], and nanorods [16]. Elucidating the influence of the shape of NPs on biological systems could provide valuable information for the development of more effective applications for AuNPs.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Triangular and Hexagonal Anionic Gold Nanoparticles and Evaluation of Their Cytotoxicity

et al. 2019

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Comprehension of the shape-dependent properties of gold nanoparticles (AuNPs) could benefit the advancements in cellular uptake efficiency. Spherical AuNPs have generally been used for drug delivery, and recent research has indicated that the cellular uptake of triangular AuNPs was higher than that of spherical ones. Previous reports have also revealed that chemically synthesized AuNPs were cytotoxic. Therefore, we have developed a facile, cost-effective, and environmentally friendly method for synthesizing triangular and hexagonal anionic AuNPs. The zeta potential of the synthesized AuNPs was negative, which indicated that their surface could be easily functionalized with positively charged molecules to upload drugs or biomolecules. Transmission electron microscopy (TEM) images illustrated that the largest particle size of the synthesized quasi-hexagonal AuNPs was 61 nm. The TEM images also illustrated that two types of equilateral-triangular AuNPs were synthesized: One featured sharp and the other rounded corners. The sides of the smallest and largest triangular AuNPs were 23 and 178 nm, respectively. Energy-dispersive X-ray spectra of the green-synthesized AuNPs indicated that they consisted entirely of elemental Au. The cytotoxicity of the green-synthesized AuNPs was evaluated using 3T3-L1 adipocytes. Using cell viability data, we determined that the green-synthesized AuNPs did not exhibit any cytotoxic effects on 3T3-L1 adipocytes.

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“…1 Furthermore, there has been impressive progress in the synthesis of a variety of gold nanoparticles, such as nanospheres, nanostars, nanorods, nanocubes, and nanoplates. [2][3][4][5][6][7][8] In this regard, gold nanoparticles are widely used in many research fields, including bio-sensin, [9][10][11] photothermal cancer therapy, 12,13 catalysis, 14,15 and drug delivery mechanisms. 16,17 Recently, two-dimensional (2D) triangular gold nanoplates (AuNPs) have been gaining considerable interest due to their unique optical properties and extremely high anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Single-particle Correlation Study: Polarization-dependent Differential Interference Contrast Imaging of Two-dimensional Gold Nanoplates

Lee

2019

ANAL. SCI.

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Questions surrounding the optical properties of two-dimensional (2D) triangular single gold nanoplates (AuNPs) remain largely unanswered. Herein, a scanning-electron microscopy-correlated single-particle study was conducted to identify polarization-dependent optical properties of AuNPs under dark-field (DF) and differential interference contrast (DIC) microscopy. AuNPs with an aspect ratio of ∼3 showed a single broad DF scattering spectrum without separation of the two dipole and quadrupole resonance modes present in 2D AuNPs. Polarization-sensitive interference properties of the individual AuNPs were revealed through periodic changes in the intensities and types of DIC images obtained. A dipole resonance mode was found to mainly contribute to the polarization-sensitive interference properties of AuNPs. Furthermore, DIC polarization anisotropy allowed us to track the real-time orientation of a dipole resonance mode of a AuNP rotating on a live cell membrane.

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One-step synthesis of a monolayer of monodisperse gold nanocubes for SERS substrates

Abstract: Here, we report for the first time a facile and fast one-step strategy to fabricate monodisperse gold nanocubes (GNCs) by spin-coating a gold precursor-loaded PMMA dispersion on N-doped silicon.

Cited by 46 publications

References 44 publications

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

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

Facile Synthesis of Triangular and Hexagonal Anionic Gold Nanoparticles and Evaluation of Their Cytotoxicity

Single-particle Correlation Study: Polarization-dependent Differential Interference Contrast Imaging of Two-dimensional Gold Nanoplates

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