Self-assembly of colloidal nanoparticles into 2D arrays at water–oil interfaces: rational construction of stable SERS substrates with accessible enhancing surfaces and tailored plasmonic response

Ye, Ziwei; Li, Chunchun; Chen, Qinglu; Xu, Yikai; Bell, Steven E. J.

doi:10.1039/d0nr08803j

Cited by 63 publications

(49 citation statements)

References 127 publications

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“…Kang et al implemented a bottom-up approach to achieve self-assembly of a close-packed gold octahedral array that exhibited an intense electric field at the edges and sharp corners of the nanostructure [ 65 ]. Ye et al fabricated densely-packed, 2D arrays of plasmonic nanoparticles via nanoparticle self-assembly at the water-oil interface [ 66 ]. Small interparticle distances created highly stable, reproducible plasmonically active materials, enabling accurate quantitative SERS measurements.…”

Section: Applications Of Sers In Drug Detectionmentioning

confidence: 99%

Recent Advances in the Use of Surface-Enhanced Raman Scattering for Illicit Drug Detection

Azimi¹,

Docoslis²

2022

Sensors

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The rapid increase in illicit drug use and its adverse health effects and socio-economic consequences have reached alarming proportions in recent years. Surface-enhanced Raman scattering (SERS) has emerged as a highly sensitive analytical tool for the detection of low dosages of drugs in liquid and solid samples. In the present article, we review the state-of-the-art use of SERS for chemical analysis of illicit drugs in aqueous and complex biological samples, including saliva, urine, and blood. We also include a review of the types of SERS substrates used for this purpose, pointing out recent advancements in substrate fabrication towards quantitative and qualitative detection of illicit drugs. Finally, we conclude by providing our perspective on the field of SERS-based drug detection, including presently faced challenges. Overall, our review provides evidence of the strong potential of SERS to establish itself as both a laboratory and in situ analytical method for fast and sensitive drug detection and identification.

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Section: Applications Of Sers In Drug Detectionmentioning

confidence: 99%

Recent Advances in the Use of Surface-Enhanced Raman Scattering for Illicit Drug Detection

Azimi¹,

Docoslis²

2022

Sensors

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“…Ye et al have reviewed the spontaneous self-assembly of NPs at an oil-water interface and subsequent removal to a substrate surface [101]. There is some emphasis on the control of the interparticle separation in the 0.5-5 nm range.…”

Section: Self-assembly Of Colloidal Nanoparticlesmentioning

confidence: 99%

Electron transport in discontinuous metal thin films

Morris

2022

Nano Ex.

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The structure and basic experimental electrical properties of vacuum evaporated discontinuous (island) metal thin films of discrete metal nanoparticles on insulating substrates are briefly reviewed. Then the widely accepted Neugebauer and Webb (N&W) electrostatically activated electron tunneling conduction model is covered (with enhancements) before the numerous discrepancies between this model and experimental observations are identified, e.g. minimal substrate bias effect, non-linear field distribution, anomalous AC effects, asymmetrical contact effects, and switching. A modified model, based on contact electron injection and extraction, and computer simulations are introduced which explain these discrepancies at a qualitative level. However, quantitative experimental verification of the model is not possible without stable, reproducible films of known structures. The paper concludes with a review of possible preparation techniques which could yield satisfactory samples, especially self-assembly of organically protected metal nanoparticles. One of these has already demonstrated electrostatically activated conduction.

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“…Typical NP superstructures reported are thin films with defined thicknesses (e.g., monolayers) over comparably large areas, [126] supercrystals with well-defined facets, and crystalline habits/morphologies like octahedra, tetrahedra, and twinned and/or truncated versions thereof, [2,47,127] and structures with some extent of intrinsic crystalline order but without well-defined morphologies. For instance, the latter can be rough thin films with many voids and islands or very thick assemblies with irregular morphology.…”

Section: Structures Obtained By Np Self-assemblymentioning

confidence: 99%

Recent Notable Approaches to Study Self‐Assembly of Nanoparticles with X‐Ray Scattering and Electron Microscopy

Schulz

Lokteva

Parak

et al. 2021

Part & Part Syst Charact

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several issues far from being resolved: for many systems long-range periodic order is not routinely achieved, reproducibility is often not optimal and truly emergent and new properties arising from the supercrystal formation could be demonstrated for just a few systems. [3][4][5][6][7] From the materials science perspective there is no established figure of merit or common set of parameters allowing to quantify "quality" of NP superlattices and supercrystals. In lieu of such standard procedures, terms as well-ordered, crystalline order, quasicrystalline, etc., are usually used in literature. However, there exist no commonly accepted definitions of what qualifies, e.g., as "well-ordered."In this review, we want to highlight some recent experimental developments and new approaches to study self-assembly of NPs or structure formation of NP supercrystals and their final structure. We focus on NP, the broad field of photonic materials prepared by self-assembly of larger colloidal particles is not covered herein. [8][9][10] The introduction of the basic concepts of NP self-assembly will be kept short and should be considered as an overview, for more background and details excellent comprehensive reviews are available. [2,11] We will then briefly address and discuss the expectations associated with self-assembled materials, especially the proposed emergence of new properties directly related to order. In the second part of the review, we will present recent innovative approaches for the investigation of self-assembly and self-assembled structures that go beyond the standard characterization. We focus mainly on structure and structure formation and less on properties, so most of the studies are based on scattering and electron microscopy. Figure 1 provides an overview roughly following this outline. Self-Assembly of NanoparticlesSelf-assembly is a broad term and occurs on all scales from atoms, ions, and molecules to galaxies, as pointed out by Whitesides and Grzybowski. [12] It can be defined as the autonomous organization of multiple discrete components into ordered structures, driven by energetics or entropy or both. [2,13] In nature, countless examples of highly complex and functional structures resulting from self-assembly can be found, Self-assembly of nanoparticles (NPs) has evolved into a powerful tool for the synthesis of superstructures with tailored properties. The quality, diversity, and complexity of synthesized structures are continuously improving and fascinating new collective properties are demonstrated. At the same time, the rapid development of electron microscopy and synchrotron sources for X-rays has enabled new exciting experimental approaches to study structure and structure formation in the context of NP self-assembly. In this review, some recent studies and what can be learned from them are highlighted and discussed. It is started with a general introduction covering important concepts, experimental approaches, commonly obtained structures, the ideas of artificial atoms, and emerging properties a...

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Self-assembly of colloidal nanoparticles into 2D arrays at water–oil interfaces: rational construction of stable SERS substrates with accessible enhancing surfaces and tailored plasmonic response

Abstract: Self-assembly at water-oil interfaces has been shown to be a cheap, convenient and efficient route to obtaining densely-packed layers of plasmonic nanoparticles which have small interparticle distances. This creates highly...

Cited by 63 publications

References 127 publications

Recent Advances in the Use of Surface-Enhanced Raman Scattering for Illicit Drug Detection

Recent Advances in the Use of Surface-Enhanced Raman Scattering for Illicit Drug Detection

Electron transport in discontinuous metal thin films

Recent Notable Approaches to Study Self‐Assembly of Nanoparticles with X‐Ray Scattering and Electron Microscopy

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