Addressing the plasmonic hotspot region by site-specific functionalization of nanostructures

Goerlitzer, Eric S. A.; Speichermann, Lutz E.; Mirza, Talha Ahmed; Mohammadi, Reza; Vogel, Nicolas

doi:10.1039/c9na00757a

Cited by 18 publications

(19 citation statements)

References 61 publications

(91 reference statements)

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“…[178][179][180] Hot-spots around their sharp tips provide high near-field enhancements, [181,182] that can be selectively accessed by surface modification. [183,184] One common way to fabricate planar crescents is the directed evaporation of a plasmonic metal with a defined elevation angle (Figure 7i, middle section), which leads to the deposition of material underneath the masking particles. Consecutive physical ion etching along the surface normal (Figure 7i, purple arrow) removes all material not shielded by the particles, producing the crescent-shaped Adv.…”

Section: "Conventional" Colloidal Lithographymentioning

confidence: 99%

The Beginner's Guide to Chiral Plasmonics: Mostly Harmless Theory and the Design of Large‐Area Substrates

Goerlitzer

Puri

Moses

et al. 2021

Advanced Optical Materials

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Plasmonic effects in noble metal nanostructures are probably one of the most widely recognized forms of nanotechnology. The tremendous success and interdisciplinary use of plasmonic Chiral plasmonics is a fascinating research field that is attractive to scientists from diverse backgrounds. Physicists study light-matter interactions, chemists seek ways to analyze enantiomeric molecules, biologists study living objects, and material engineers focus on scalable production processes. Successful access to this emergent field for an interdisciplinary community depends on overcoming three main issues. First, understanding the physical background of chiral plasmonics requires proper introduction in easy language. Second, pitfalls in the characterization of chiroplasmonic features can prevent accurate interpretation. Third, simple and robust methods capable of covering macroscopic substrate areas must be available. This tutorial-style review addresses these issues with the goal to provide a comprehensive introduction into chiral plasmonic nanostructures. It starts with a brief introduction of the relevant physics involved in chiral light−matter interactions. A brief guide about how to adequately characterize samples follows. Subsequently, an overview of fabrication techniques that produce chiral substrates over large areas is given, and the strengths and weaknesses of the different approaches are discussed. The focus is on simple and robust processes that do not require clean room facilities and can be implemented by a much larger scientific audience.

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Section: "Conventional" Colloidal Lithographymentioning

confidence: 99%

The Beginner's Guide to Chiral Plasmonics: Mostly Harmless Theory and the Design of Large‐Area Substrates

Goerlitzer

Puri

Moses

et al. 2021

Advanced Optical Materials

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“…[38] When multiple nanoscale structures are combined together into an array, unique plasmonic capabilities can also be obtained as evidenced in nanoarray and nanolattice plasmonic biosensors, including nanohole and nanoslit arrays, nanodisks, and nanoparticle functionalized surfaces. [40][41][42] Other notable examples of nanoarray structures were outlined in a recent review by Jiang et al [40] These include nanocrescents, [43][44][45] nanocross and bar, [46,47] and nanobowls. [48][49][50] Another relatively common phenomena utilized in optical biosensing is SERS.…”

Section: Optical Biosensorsmentioning

confidence: 99%

Advances in Biosensors and Diagnostic Technologies Using Nanostructures and Nanomaterials

Welch

Powell

Clevinger

et al. 2021

Adv Funct Materials

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Nanoscale materials have unique properties that make them especially useful for biomedical diagnostic applications. Recent developments in nanoengineering have resulted in increasing use of nanostructures in biosensors. Various types of 0D, 1D, 2D, and 3D nanostructures have been used to improve biosensor sensitivity, selectivity, limit of detection, and time to result, among other metrics. These nanostructures have been integrated into electrochemical, optical, and other biosensors for this purpose. Here, the most recent advances in the use of nanostructured materials in biosensors are described. This includes a discussion of nanoparticles, nanorods, nanofibers, nanopillars, nanowires, nanosheets, indented nanopatterns (nanoholes and nanoslits), nanogaps, nanochannels, nanopores, nanofunctionalized surfaces, and complex hierarchical structures and their unique advantages and applications in biosensors. Clinical applications of these nanobiosensors are also highlighted along with a discussion of the future directions for these materials in diagnostics.

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“…Nanostructured gratings often comprise multiple materials (e.g., glass and gold) and exhibit surface curvatures (e.g., edges, tips). On the other hand, the heterogeneous chemistry composition of nanostructures could be exploited to functionalize only the areas where the electromagnetic field is enhanced rather than the entire surface [101].…”

Section: Analyte Detection Based On Plasmonic Systemsmentioning

confidence: 99%

Nanostructured Organic/Hybrid Materials and Components in Miniaturized Optical and Chemical Sensors

et al. 2020

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In the last decade, biochemical sensors have brought a disruptive breakthrough in analytical chemistry and microbiology due the advent of technologically advanced systems conceived to respond to specific applications. From the design of a multitude of different detection modalities, several classes of sensor have been developed over the years. However, to date they have been hardly used in point-of-care or in-field applications, where cost and portability are of primary concern. In the present review we report on the use of nanostructured organic and hybrid compounds in optoelectronic, electrochemical and plasmonic components as constituting elements of miniaturized and easy-to-integrate biochemical sensors. We show how the targeted design, synthesis and nanostructuring of organic and hybrid materials have enabled enormous progress not only in terms of modulation and optimization of the sensor capabilities and performance when used as active materials, but also in the architecture of the detection schemes when used as structural/packing components. With a particular focus on optoelectronic, chemical and plasmonic components for sensing, we highlight that the new concept of having highly-integrated architectures through a system-engineering approach may enable the full expression of the potential of the sensing systems in real-setting applications in terms of fast-response, high sensitivity and multiplexity at low-cost and ease of portability.

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Addressing the plasmonic hotspot region by site-specific functionalization of nanostructures

Abstract: We provide a simple and parallel method to selectively functionalize the hot-spot regions of plasmonic nanostructures, allowing to deposit molecules or particles directly at the most active sites.

Cited by 18 publications

References 61 publications

The Beginner's Guide to Chiral Plasmonics: Mostly Harmless Theory and the Design of Large‐Area Substrates

The Beginner's Guide to Chiral Plasmonics: Mostly Harmless Theory and the Design of Large‐Area Substrates

Advances in Biosensors and Diagnostic Technologies Using Nanostructures and Nanomaterials

Nanostructured Organic/Hybrid Materials and Components in Miniaturized Optical and Chemical Sensors

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