Tailoring surface plasmons of high-density gold nanostar assemblies on metal films for surface-enhanced Raman spectroscopy

Lee, Jiwon; Hua, Bo; Park, Seung-Young; Ha, Minjeong; Lee, Youngsu; Fan, Zhiyong; Ko, Hyunhyub

doi:10.1039/c3nr04752k

Cited by 131 publications

(117 citation statements)

References 68 publications

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“…67 For AuNS assemblies on glass substrates, the field enhancement from AuNS-AuNS coupling has previously been shown to decrease exponentially with increasing interparticle distance, as is typically observed for nearfield interactions in nanoparticle assemblies. 74 In summary, our analysis suggests that tuning the total fluorescent enhancement essentially depends on controlling the excitation enhancement, and illustrates the significant impact of nanotopography on fluorescence enhancement. Our findings clearly demonstrate that AuNS substrates are effective MEF platforms for the enhancement of light from NIR dyes, leading to brightness comparable to that of visible dyes.…”

Section: Fluorophore This Observation Implies That the Electromagnetmentioning

confidence: 99%

“…40 Therefore, control of these morphological features allows systematic tunability of their optical properties across a wide range of the electromagnetic spectrum, reaching the NIR and NIR-II regions. 40,41 As a result of their LSPR, the local electric field near their sharp tips, between the spikes of individual AuNS, or between the spikes of adjacent nanostars, can be enhanced by several orders of magnitude, 40,42 holding great promise for large fluorescence enhancement. Their fabrication by wet chemical synthesis is low cost, readily scalable and can ultimately allow to synthesize multifunctional MEF agents, which induce bright NIR/NIR-II fluorescence and simultaneously carry other diagnostic or therapeutic molecules.…”

Section: Acs Paragon Plus Environmentmentioning

confidence: 99%

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Gold Nanostar Substrates for Metal-Enhanced Fluorescence through the First and Second Near-Infrared Windows

et al. 2017

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Gold nanostars; self-assembled monolayers; near infrared; NIR-II; metal enhanced fluorescence; localized surface plasmon resonance; fluorescence lifetime.Gold nanostars (AuNS) are receiving increasing attention for their potential applications in bionanotechnology, because of their unique optical properties related to their complex branched morphology. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 confirming that AuNS substrates are promising NIR-MEF platforms for the development of ultrasensitive biosensing applications. Using fluorescence lifetime measurements to semi-quantitatively deconvolute the excitation enhancement from emission enhancement, as well as modelling to simulate the electric field enhancement, we show that a combination of enhanced excitation and an increased radiative decay rate, accompanied by an increase to the quantum yield, contribute to the observed large enhancement. AuNS with different morphological features exhibit significantly different excitation enhancement, indicating the important role of particle morphology on the magnitude of electromagnetic field enhancement, and the resulting enhancement factor. Importantly, enhancement factors of up to 50 times are also achieved in the NIR-II region, suggesting that this system holds promise for the future development of bright probes for NIR/NIR-II biosensing and bioimaging.

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Section: Fluorophore This Observation Implies That the Electromagnetmentioning

confidence: 99%

Section: Acs Paragon Plus Environmentmentioning

confidence: 99%

Gold Nanostar Substrates for Metal-Enhanced Fluorescence through the First and Second Near-Infrared Windows

et al. 2017

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“…On these substrates multiple fi eld enhancements from particle-fi lm and interparticle plasmon couplings are expected and lightening rod effected of sharp tips of nanostars contributes to the enormous values of the Raman enhancement that has been described [ 20 ]. The authors showed that the interparticle and particle-fi lm plasmon couplings of high-density GNS on metal and dielectric fi lms can be tuned through the interparticle separation to provide maximum SERS effects.…”

Section: Application Of Gns For Sensing Assaysmentioning

confidence: 94%

Applications of Gold Nanostars: Nanosensing, Thermal Therapy, Delivery Systems

et al. 2015

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This chapter focuses on the most relevant applications of GNS in life science. The versatility of the GNS functionalization is combined with their optical properties to provide promising and prospective approaches in a variety of biomedical fi elds. Nanosensing assays, thermal treatments, and delivery systems based on GNS are discussed in this chapter. Keywords SERS-based sensing • Hyperthermia • Photothermal effect • Smart deliveryFunctionalized gold nanoparticles with controlled geometrical and optical properties are the subject of intensive studies and biomedical applications, including genomics, biosensors, immunoassays, clinical chemistry, laser phototherapy of cancer cells and tumors, and delivery platforms. In these fi elds targeted delivery of drugs, DNA, and antigens is coupled to optical bioimaging and the possibility to monitor cells and image details of tissues with the use of state-of-the-art detection systems [ 1 ]. Nonspherical gold nanoparticles are particularly interesting due to their capability to release locally heat with large effi ciency when they are irradiated in the NIR region of the spectrum [ 2 ]. In addition their size and the shape anisotropy essentially determine the position and the amplitude of the NIR-localized surface plasmon resonance [ 3 ]. The shape of the gold nanostars (GNS), in particular, can be tuned from the shape of sea urchin to that of planar, highly regular penta-branched stars [ 4 ]. The NIR-localized surface plasmon resonance of GNS can be consequently tuned in a wide NIR range up to 1250 nm by varying the axial ratio of protruding branches and multiple LSPR band in the NIR can also be obtained [ 4 ]. The possibility to easily decorate the surface of GNS, in combination with their optical properties

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“…41 the sensing merits of metallic structures, such as nanostars, 57 nanorings, 58 nanocrosses, 59 nanodisks, 60 and so on. 41 the sensing merits of metallic structures, such as nanostars, 57 nanorings, 58 nanocrosses, 59 nanodisks, 60 and so on.…”

Section: Introductionmentioning

confidence: 99%

Graphene-based hybrid films for plasmonic sensing

Zhao

Zhu

2015

Nanoscale

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Graphene, a one-atomic-layer-thick planar sheet of sp(2)-bonded carbon configured in a two-dimensional hexagonal lattice, has attracted considerable research interest with regard to sensing-related applications owing to its extraordinary electronic, optical, chemical, and mechanical properties. Graphene plasmonics may be excited in the mid-infrared-to-terahertz regions with high spatial confinement, low loss, and excellent tunability. Meanwhile, graphene can be utilized to tune the plasmonic properties of conventional metallic nanostructures in the visible and near-infrared regions, allowing it to act as a versatile component in various plasmonic applications. This article reviews the recent progress in graphene-based hybrid films used for plasmonic sensing and detection. We particularly emphasize on the unique roles and advantages of graphene in surface-enhanced Raman scattering (SERS) for bare graphene or graphene-metal hybrid films, and plasmonic refractive index (RI) sensing for graphene-metal or graphene-insulator hybrids, among other plasmonic sensing applications. The preparation of graphene-based hybrid films, their functionalization and signal detection techniques are also reviewed. Finally, the perspectives and current challenges in the use of graphene-based hybrid films for plasmonic sensing are outlined.

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Tailoring surface plasmons of high-density gold nanostar assemblies on metal films for surface-enhanced Raman spectroscopy

Cited by 131 publications

References 68 publications

Gold Nanostar Substrates for Metal-Enhanced Fluorescence through the First and Second Near-Infrared Windows

Gold Nanostar Substrates for Metal-Enhanced Fluorescence through the First and Second Near-Infrared Windows

Applications of Gold Nanostars: Nanosensing, Thermal Therapy, Delivery Systems

Graphene-based hybrid films for plasmonic sensing

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