Free‐Standing 2D Nanoassemblies

Shi, Qianqian; Cheng, Wenlong

doi:10.1002/adfm.201902301

Cited by 45 publications

(34 citation statements)

References 193 publications

(262 reference statements)

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“…More recently, nanoparticle composite films have been deposited onto three‐dimensionally structured substrates to yield nanometer‐thin freestanding membranes with lateral extensions in the micrometer range. [ 19 ] Noble metal nanoparticle membranes render a new material class. They enable addressing their unique optoelectronic properties (interparticle tunneling, plasmonics) originating from individual or collective characteristics of the incorporated nanoparticles directly, without substrate effects.…”

Section: Introductionmentioning

confidence: 99%

Cross‐Linked Gold Nanoparticle Composite Membranes as Highly Sensitive Pressure Sensors

Schlicke

Kunze²,

Rebber³

et al. 2020

Adv Funct Materials

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In this article, highly sensitive differential pressure sensors based on freestanding membranes of cross-linked gold nanoparticles are demonstrated. The nanoparticle membranes are employed as both diaphragms and resistive transducers. The elasticity and the pronounced resistive strain sensitivity of these nanometer-thin composites enable the fabrication of sensors achieving high sensitivities exceeding 10 −3 mbar −1 while maintaining an overall small membrane area. Furthermore, by combining micro-bulge tests with atomic force microscopy and in situ resistance measurements the membranes' electromechanical responses are studied through precise observation of the concomitant changes of the membranes' topography. The study demonstrates the high potential of free-standing nanoparticle composites for the fabrication of highly sensitive force and pressure sensors and introduces a unique and powerful method for the electromechanical investigation of these materials.

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Section: Introductionmentioning

confidence: 99%

Cross‐Linked Gold Nanoparticle Composite Membranes as Highly Sensitive Pressure Sensors

Schlicke

Kunze²,

Rebber³

et al. 2020

Adv Funct Materials

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show abstract

“…By using a polymer-based strategy, new concepts and 2D superlattices have been reported in this burgeoning research area, such as plasmene-based origami (Si et al, 2014(Si et al, , 2016 and Janus superlattice (Shi et al, 2019b). With the integration of top-down nanofabrication approaches, the polymer-ligand-based strategy suggests a facile yet efficient pathway toward the fabrication of practical device construction (Shi and Cheng, 2020).…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Fabrication of Plasmonic Superlattice Membrane by Aspect-Ratio Controllable Nanobricks for Label-Free Protein Detection

et al. 2020

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Plasmonic superlattice membrane exhibits remarkable functional properties that are emerging from engineered assemblies of well-defined "meta-atoms," which is featured as a conceptual new category of two-dimensional optical metamaterials. The ability to build plasmonic membranes over macroscopic surfaces but with nanoscale ordering is crucial for systematically controlling the light-matter interactions and represents considerable advances for the bottom-up fabrication of soft optoelectronic devices and circuits. Through rational design, novel nanocrystals, and by engineering the packing orders, the hybridized plasmon signature can be customized, promoting controllable near-field confinement for surface-enhanced Raman scattering (SERS) based detection. However, building such 2D architectures has proven to be remarkably challenging due to the complicated interparticle forces and multiscale interactions during self-assembly. Here, we report on the fabrication of ultralong-nanobrick-based giant plasmonic superlattice membranes as high-performance SERS substrates for ultrasensitive and label-free protein detection. Using aspect-ratio controllable short-to-ultralong nanobricks as building blocks, we construct three distinctive plasmonic membranes by polymer-ligand-based strategy in drying-mediated self-assembly at the air/water interfaces. The plasmonic membranes exhibit monolayered morphology with nanoscale assembled ordering but macroscopic lateral dimensions, inducing enhanced near-field confinement and uniform hot-spot distribution. By choosing 4-aminothiophenol and bovine serum albumin (BSA) as a model analyte, we establish an ultrasensitive assay for label-free SERS detection. The detection limit of BSA can reach 15 nM, and the enhancement factor reached 4.3 × 10 5 , enabling a promising avenue for its clinical application in ultrasensitive biodiagnostics.

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“…[ 66–68 ] A ligand exchange process is typically employed either before or during the self‐assembly process to introduce strongly bonded ligands (e.g., thiolated polymers/small molecules [ 69 ] ) on plasmonic NPs. The ligands not only sufficiently protect plasmonic NPs from aggregation/sintering/fusion during self‐assembly [ 70 ] but also ensure the overall structural integrity of self‐assembled structures after transfer onto flexible substrates, which is crucial for investigating their plasmonic properties in response to mechanical deformations. In addition, the ligands play vital roles in determining the optical, photothermal, mechanical, and chemical properties of flexible plasmonic nanostructures, which will be discussed later in this review.…”

Section: Fabricationmentioning

confidence: 99%

Soft Plasmonics: Design, Fabrication, Characterization, and Applications

Lü

Cheng

2021

Advanced Optical Materials

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Plasmonic nanostructures are important building blocks in modern nanoscience and nanotechnology. Significant research efforts have been directed toward developing solution‐based or rigid‐substrate‐supported metallic nanostructures for novel applications in biophotonics, sensing, energy, and medicine. In parallel, there has been an increasing interest in the fabrication of plasmonic nanostructures on elastomeric substrates and exploring the impact of mechanical deformation including bending, torsion, and stretching on the collective plasmonic resonance properties. This burgeoning field may be defined as soft plasmonics (or soft mechanoplasmonics), analogous to soft electronics. This review describes the recent progress in the design, fabrication, characterization, properties, and applications of soft plasmonics. Soft plasmonics are expected to afford complementary features and functions to the field of soft electronics, enabling applications that are difficult or impossible to achieve with traditional rigid plasmonic structures, such as conformal attachment or integration with soft biological systems for real‐time sensing, actuation, and close‐loop feedback.

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Free‐Standing 2D Nanoassemblies

Cited by 45 publications

References 193 publications

Cross‐Linked Gold Nanoparticle Composite Membranes as Highly Sensitive Pressure Sensors

Cross‐Linked Gold Nanoparticle Composite Membranes as Highly Sensitive Pressure Sensors

Hierarchical Fabrication of Plasmonic Superlattice Membrane by Aspect-Ratio Controllable Nanobricks for Label-Free Protein Detection

Soft Plasmonics: Design, Fabrication, Characterization, and Applications

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