Configuration-controlled Au nanocluster arrays on inverse micelle nano-patterns: versatile platforms for SERS and SPR sensors

Jang, Yoon Hee; Chung, Kyungwha; Quan, Li Na; Špačková, Barbora; Šípová, Hana; Moon, Seok Jun; Cho, Won Joon; Shin, Hyunik; Jang, Yu Jin; Lee, Ji Eun; Kochuveedu, Saji Thomas; Yoon, Min Ho; Kim, Jihyeon; Yoon, Seokhyun; Kim, Jin Kon; Kim, Dong-Hyun; Homola, Jiřı́; Kim, Dong Ha

doi:10.1039/c3nr03860b

Cited by 44 publications

(30 citation statements)

References 72 publications

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“…The ability to create solid-state materials from atomic elements using a bottom-up method such as epitaxial growth, alloying, or chemical synthesis plays a crucial role in today's science and engineering. The controlled assembly of nanoclusters [1][2][3][4][5][6][7][8][9] is expected to be a novel material-processing methodology providing hierarchical nanostructures with tailored dimensionality and functionalities such as ultrathin heterojunctions exhibiting electrical rectification, photoelectric conversion, ferroelectricity, and high catalytic reactivity. Gas-phasesynthesized Si 16 cages encapsulating a single metal atom (M@Si 16 ) are potential building blocks for such nanocluster assemblies, because their physicochemical properties are tunable while retaining the symmetrical cage shape by changing the type of metal atom and the charge state.…”

Section: Introductionmentioning

confidence: 99%

Formation of a superatom monolayer using gas-phase-synthesized Ta@Si₁₆nanocluster ions

et al. 2014

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The controlled assembly of superatomic nanocluster ions synthesized in the gas phase is a key technology for constructing a novel series of functional nanomaterials. However, it is generally difficult to immobilize them onto a conductive surface while maintaining their original properties owing to undesirable modifications of their geometry and charge state. In this study, it has been shown that this difficulty can be overcome by controlling the donor-acceptor interaction between nanoclusters and surfaces. Cations of Ta-atom-encapsulated Si(16) cage nanoclusters (Ta@Si(16)) behaving as rare-gas-like superatoms are synthesized in the gas phase and deposited on conductive surfaces terminated with acceptor-like C(60) and donor-like α-sexithiophene (6 T) molecules. Scanning tunneling microscopy and spectroscopy have demonstrated that Ta@Si(16) cations can be densely immobilized onto C(60)-terminated surfaces while retaining their cage shape and positive charge, which is realized by creating binary charge transfer complexes (Ta@Si(16)(+)-C(60)(-)) on the surfaces. The Ta@Si(16) nanoclusters exhibit excellent thermal stability on C(60-)terminated surfaces similar to those in the gas phase, whereas the nanoclusters destabilize at room temperature on 6 T-terminated surfaces owing to the loss of electronic closure via a change in the charge state.

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Section: Introductionmentioning

confidence: 99%

Formation of a superatom monolayer using gas-phase-synthesized Ta@Si₁₆nanocluster ions

et al. 2014

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“…1,5,8,9 Therefore, the "hotspots" in a metal substrate where strong electromagnetic fields appear play a vital role in the enhancement of Raman signals. 13 Two main methods have been developed to synthesize SERS substrates, including the chemical reduction method and scanning beam lithography. 1,2,[4][5][6][7][8] The micro/nano-scale particles or thin films of Au, Ag and Cu have been widely accepted as efficient SERS substrates.…”

Section: Introductionmentioning

confidence: 99%

Large-scale synthesis of gold dendritic nanostructures for surface enhanced Raman scattering

et al. 2015

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Au dendritic nanostructures with sharp tips have been successfully fabricated on a large scale by reducing potassium tetrachloroaurate (KAuCl 4 ) with hydrofluoric acid on a Si wafer locally processed using a focused ion beam (FIB) technique. Surface enhanced Raman scattering (SERS) with Rhodamine B (RhB) molecules on a nanostructured substrate is greatly enhanced, originating from "hot-spots" located at the nanogaps between adjacent branches on dendritic nanostructures. Furthermore, Au dendritic nanostructures as recyclable SERS substrates exhibit an ultrasensitive response to the pico-scale concentration of probe molecules. This work shows that greatly enhanced SERS substrates with a high degree of reliability and reproducibility can be fabricated at a relatively low cost, which could help SERS to realize its full potential as a very sensitive tool for trace analysis. CrystEngCommThis journal is

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“…On the basis of sensitive LSPR nanosubstrates, the realization of selectivity/specificity is the next mission to fabricate plasmonic biosensors ( Figure a). There are several classical pairs of specific recognition, including antibody–antigen, nucleic‐acid hybridization, enzyme–substrate, and biotin–avidin systems . Also, other intriguing materials have been discovered to realize specific recognition, such as molecular imprinting polymer (MIP).…”

Section: Principle and Fabrication Of Lspr Biosensorsmentioning

confidence: 99%

Section: Principle and Fabrication Of Lspr Biosensorsmentioning

confidence: 99%

Construction of Plasmonic Nano‐Biosensor‐Based Devices for Point‐of‐Care Testing

Wang

Zhou

2017

Small Methods

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rapid detection technique for the future of home healthcare, mobile healthcare, and public health security. [4] At present, POCTs mainly use conventional lateral flow assays (LFAs) and electrochemical biosensors (such as blood glucose meter) for biosensing. [4,5] To promote the wider application of POCT, new sensing components are expected to appear. Plasmonic nano-biosensor, which stems from the interaction of light and metal nanostructures, is an advancing and promising optical sensor for ultrasensitive, ultrahighspatial-resolution and label-free biodetection. Plasmonic biosensors are mainly divided into propagating surface plasmon resonance (PSPR) and localized surface plasmon resonance (LSPR) biosensors. PSPR arises from the interaction between incident light and a planar metal surface; LSPR confines light to metal nanostructures that are smaller than the wavelength of light, thereby enabling the measurement of the dielectric changes near the metallic surface. [6] Compared with commercially available PSPR sensors, LSPR sensors are simple, cost effective, easy to integrate into miniaturized devices, and suitable for measuring changes in local refractive index (RI) caused by the adsorption of target molecules. [4] Since RI is related to the dielectric property of the environment near the metal nanostructures, LSPR sensors can realize RI biosensing in a convenient way. LSPR nano-biosensors are expected to be easily integrated into miniaturized devices for POCT. Due to the high sensitivity of LSPR biosensor and its possibility to achieve full automation, as therefore to attain time-saving and avoid human error, the integration of LSPR biosensors into portable devices will promote the wider applications of POCT for enhanced healthcare (e.g., on-site diagnosis, personalized medicine, wearable devices, etc.), higher public security (e.g., antiterrorism), environmental monitoring, and food safety. [7][8][9] The evolving of LSPR biosensing into POCT mainly involves four core requirements (Figure 1): i) sensing nanosubstrates with high RI sensitivity; ii) detection strategies to realize specific detection; iii) integrated microfluidic chips for sample pretreatment and multiplex analysis, and iv) portable POCT devices to perform automated and easy-to-use biodetections. Through the advances on plasmonics and nanofabrication in the last few years, highly sensitive as well as large-area producible nanosubstrates for LSPR biosensing have been developed. [10][11][12] In the meanwhile, high specificity and strong anti-interference Next-generation healthcare equipment and devices are in great demand for point-of-care testing (POCT), in view of their applications in rapid disease diagnosis, personalized medicine, portable or mobile health care, nontechnician assays, etc. Localized surface plasmon resonance (LSPR) biosensors, which are based on noble-metal nanostructures and which provide fast, realtime, nonlabeled, and sensitive biochemical detections, have become one of the leading candidates for POCT. The advances in nanofabr...

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Configuration-controlled Au nanocluster arrays on inverse micelle nano-patterns: versatile platforms for SERS and SPR sensors

Cited by 44 publications

References 72 publications

Formation of a superatom monolayer using gas-phase-synthesized Ta@Si₁₆nanocluster ions

Formation of a superatom monolayer using gas-phase-synthesized Ta@Si₁₆nanocluster ions

Large-scale synthesis of gold dendritic nanostructures for surface enhanced Raman scattering

Construction of Plasmonic Nano‐Biosensor‐Based Devices for Point‐of‐Care Testing

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Configuration-controlled Au nanocluster arrays on inverse micelle nano-patterns: versatile platforms for SERS and SPR sensors

Cited by 44 publications

References 72 publications

Formation of a superatom monolayer using gas-phase-synthesized Ta@Si16nanocluster ions

Formation of a superatom monolayer using gas-phase-synthesized Ta@Si16nanocluster ions

Large-scale synthesis of gold dendritic nanostructures for surface enhanced Raman scattering

Construction of Plasmonic Nano‐Biosensor‐Based Devices for Point‐of‐Care Testing

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Formation of a superatom monolayer using gas-phase-synthesized Ta@Si₁₆nanocluster ions

Formation of a superatom monolayer using gas-phase-synthesized Ta@Si₁₆nanocluster ions