Self‐Assembly of Vertically Aligned Gold Nanorod Arrays on Patterned Substrates

Thai, Thibaut; Zheng, Yuanhui; Ng, Soon Hock; Mudie, Stephen; Altissimo, Matteo; Bach, Udo

doi:10.1002/anie.201204609

Cited by 105 publications

(85 citation statements)

References 38 publications

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“…S7). Future studies should focus on the use of SLIPSERS in conjunction with supraparticles, which are preassembled, highly stable forms of Au nanoparticle aggregates (55). By using supraparticles of micrometer size or smaller, one may be able to further enhance the LOD, as well as the accuracy for determining the analyte concentration for extremely diluted solutions (i.e., <1 fM concentrations).…”

Section: Resultsmentioning

confidence: 99%

“…When combined with our SERS mapping technique, we have shown that it is possible to reach attomolar detection limits, which is the lowest LOD for any SERS-based detection reported in the literature. The detection limit could be lowered further by simply increasing the starting sample volume, by using engineered nanoparticles such as coreshell (14), core-gap-shell (20), or dumbbell structures (56), or by further reducing the size of Au nanoparticle aggregate (55). SLIPSERS could be integrated with other analytical techniques such as infrared spectroscopy, fluorescence, absorption spectroscopy, and photonic crystals (57) to further expand its capabilities for chemical, biological, and materials analysis.…”

Section: Resultsmentioning

confidence: 99%

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Ultrasensitive surface-enhanced Raman scattering detection in common fluids

Yang

Dai

Stogin

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

636

442

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Detecting target analytes with high specificity and sensitivity in any fluid is of fundamental importance to analytical science and technology. Surface-enhanced Raman scattering (SERS) has proven to be capable of detecting single molecules with high specificity, but achieving single-molecule sensitivity in any highly diluted solutions remains a challenge. Here we demonstrate a universal platform that allows for the enrichment and delivery of analytes into the SERSsensitive sites in both aqueous and nonaqueous fluids, and its subsequent quantitative detection of Rhodamine 6G (R6G) down to ∼75 fM level (10 −15 mol·L −1 ). Our platform, termed slippery liquidinfused porous surface-enhanced Raman scattering (SLIPSERS), is based on a slippery, omniphobic substrate that enables the complete concentration of analytes and SERS substrates (e.g., Au nanoparticles) within an evaporating liquid droplet. Combining our SLIPSERS platform with a SERS mapping technique, we have systematically quantified the probability, p(c), of detecting R6G molecules at concentrations c ranging from 750 fM (p > 90%) down to 75 aM (10 −18 mol·L −1 ) levels (p ≤ 1.4%). The ability to detect analytes down to attomolar level is the lowest limit of detection for any SERS-based detection reported thus far. We have shown that analytes present in liquid, solid, or air phases can be extracted using a suitable liquid solvent and subsequently detected through SLIPSERS. Based on this platform, we have further demonstrated ultrasensitive detection of chemical and biological molecules as well as environmental contaminants within a broad range of common fluids for potential applications related to analytical chemistry, molecular diagnostics, environmental monitoring, and national security.spectroscopy | sensing | SERS | slippery surfaces | nanoparticles

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ultrasensitive surface-enhanced Raman scattering detection in common fluids

Yang

Dai

Stogin

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

636

442

View full text Add to dashboard Cite

show abstract

“…There is a large body of literature in this area focused on the assembly of various colloidal particles, including polystyrene spheres, 15,17 nanorods, 21,22 and carbon nanotubes. 23,24 This work is motivated by a variety of engineering and scientific applications, ranging from the synthesis of 2D crystals with unique optical properties 25 to the hierarchal assembly of nanomaterials.…”

Section: ■ Introductionmentioning

confidence: 99%

Fabrication of Planar Colloidal Clusters with Template-Assisted Interfacial Assembly

2015

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The synthesis of nanoparticle clusters, also referred to as colloidal clusters or colloidal molecules, is being studied intensively as a model system for small molecule interactions as well as for the directed self-assembly of advanced materials. This paper describes a technique for the interfacial assembly of planar colloidal clusters using a combination of top-down lithographic surface modification and bottom-up Langmuir− Blodgett deposition. Micrometer sized polystyrene latex particles were deposited onto a chemically modified substrate from a decane−water interface with Langmuir−Blodgett deposition. The surface of the substrate contained hydrophilic domains of various size, spacing, and shape, while the remainder of the substrate was hydrophobic. Particles selectively deposited onto hydrophilic regions from the decane−water interface. The number of deposited particles depended on the size of each patch, thereby demonstrating that tuning cluster size is possible by engineering patch geometry. Following deposition, the clusters were permanently bonded with temperature annealing and then removed from the substrate via sonication. The permanently bonded planar colloidal clusters were stable in an aqueous environment and at a decane−water interface laden with isotropic colloidal particles. The method is a simple and fast way to synthesize colloidal clusters with few limitations on particle chemistry, composition, and shape. ■ INTRODUCTIONSubstantial effort has been invested in developing assembly techniques for the synthesis of colloidal clusters of varying shape.1−11 A colloidal cluster assembled from individual particles is often referred to as a "colloidal molecule", especially when aggregation is sufficiently controlled such that the cluster structure resembles molecular structure. For example, a dimer of identically sized spherical colloidal particles is analogous to a molecule of H 2 .4,7 Not only do colloidal clusters serve as a model system for studying small molecules whose interactions are dictated by cluster geometry and variations in surface chemistry, but such clusters can also serve as components in the directed self-assembly of advanced materials.12 Anisotropic colloidal clusters in either 3D (i.e., in the bulk) or 2D (i.e., on a surface) have been fabricated in a number of ways, including tuning depletion interactions in "lock and key" colloids, 13 assembly via spatial templating of the substrate, 2,6 controlled evaporation of one phase in an emulsion, 1,9 and irreversible attraction between particles or between particles and a substrate that have been modified to have a specific colloidal attraction.14−20 These studies have illustrated the wide structural diversity and utility of geometrically complex colloidal clusters.The 2D directed self-assembly of colloidal particles on a substrate is a closely related research area that is often used for the fabrication of colloidal clusters. There is a large body of literature in this area focused on the assembly of various colloidal particles, i...

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“…The TEM images clearly show that direct contact between the gold nanoparticle surfaces is avoided due to the presence of the shell. Other examples to achieve such small separations are alkyl ligands [116][117][118], DNA [107,[119][120][121][122], or short-chain PEG-ligands [123], amongst others. Utilizing larger molecules as ligands gives access to larger d s .…”

Section: Particle Functionalizationmentioning

confidence: 99%

Colloidal self-assembly concepts for light management in photovoltaics

et al. 2015

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Colloidal particles show interaction with electromagnetic radiation at optical frequencies. At the same time clever colloid design and functionalization concepts allow for versatile particle assembly providing monolayers of macroscopic dimensions. This has led to a significant interest in assembled colloidal structures for light harvesting in photovoltaic devices. In particular thin-film solar cells suffer from weak absorption of incoming photons. Consequently light management using assembled colloidal structures becomes vital for enhancing the efficiency of a given device. This review aims at giving an overview of recent developments in colloid synthesis, functionalization and assembly with a focus on light management structures in photovoltaics. We distinguish between optical effects related to the single particle properties as well as collective optical effects, which originate from the assembled structures.Colloidal templating approaches open yet another dimension for controlling the interaction with light. We focus in this respect on structured electrodes that have received much attention due to their dual functionality as light harvesting systems and conductive electrodes and highlight the impact of interparticle spacing for templating.

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Self‐Assembly of Vertically Aligned Gold Nanorod Arrays on Patterned Substrates

Cited by 105 publications

References 38 publications

Ultrasensitive surface-enhanced Raman scattering detection in common fluids

Ultrasensitive surface-enhanced Raman scattering detection in common fluids

Fabrication of Planar Colloidal Clusters with Template-Assisted Interfacial Assembly

Colloidal self-assembly concepts for light management in photovoltaics

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