Chemically modified nanofoci unifying plasmonics and catalysis

Wang, Yueliang; Fang, Lingling; Gong, Mali; Deng, Zhaoxiang

doi:10.1039/c9sc00403c

Cited by 15 publications

(24 citation statements)

References 59 publications

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“…Subwavelength optical focusing has been extensively exploited to concentrate electromagnetic energy down to nanoscale regions and achieve large field enhancement, thus opening promising application prospects in optical imaging, [ 1 ] biosensing, [ 2 ] photocatalysis, [ 3 ] nonlinear optics, [ 4 ] and manipulation of nanoscale energy flow. [ 5 ] In particular, in‐plane subwavelength focusing is a critical element for realizing integrated nano‐optics devices that enable applications in planar photonics, [ 6 ] such as nanoscale imaging, enhanced spectroscopy, and nanolithography.…”

Section: Introductionmentioning

confidence: 99%

Tunable Planar Focusing Based on Hyperbolic Phonon Polaritons in α‐MoO₃

Chen

Teng

et al. 2022

Advanced Materials

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Manipulation of the propagation and energy‐transport characteristics of subwavelength infrared (IR) light fields is critical for the application of nanophotonic devices in photocatalysis, biosensing, and thermal management. In this context, metamaterials are useful composite materials, although traditional metal‐based structures are constrained by their weak mid‐IR response, while their associated capabilities for optical propagation and focusing are limited by the size of attainable artificial optical structures and the poor performance of the available active means of control. Herein, a tunable planar focusing device operating in the mid‐IR region is reported by exploiting highly oriented in‐plane hyperbolic phonon polaritons in α‐MoO3. Specifically, an unprecedented change of effective focal length of polariton waves from 0.7 to 7.4 μm is demonstrated by the following three different means of control: the dimension of the device, the employed light frequency, and engineering of phonon–plasmon hybridization. The high confinement characteristics of phonon polaritons in α‐MoO3 permit the focal length and focal spot size to be reduced to 1/15 and 1/33 of the incident wavelength, respectively. In particular, the anisotropic phonon polaritons supported in α‐MoO3 are combined with tunable surface‐plasmon polaritons in graphene to realize in situ and dynamical control of the focusing performance, thus paving the way for phonon‐polariton‐based planar nanophotonic applications.

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Section: Introductionmentioning

confidence: 99%

Tunable Planar Focusing Based on Hyperbolic Phonon Polaritons in α‐MoO₃

Chen

Teng

et al. 2022

Advanced Materials

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“…24 When capped by a strongly adsorbing buffer, AuNPs may have a hard time adsorbing other molecules such as DNA. Many of AuNP-based assays have to rely on DNA adsorption, and such assays include molecular beacons, 25,26 localized surface plasmon resonance, 27 SERS, [28][29][30] label-free colorimetric assays, 10,11 catalysis, 31,32 and even directed growth of nanomaterials. [33][34][35][36] Therefore, the effect of buffer adsorption could be critical.…”

Section: Introductionmentioning

confidence: 99%

Good's buffers have various affinities to gold nanoparticles regulating fluorescent and colorimetric DNA sensing

et al. 2020

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“…该方法不适合化学活泼材料, 且高温下原子扩散加速会破坏异质界面. 相比之下, 湿法过程更为灵活 [36] , 有望获得结晶良好的复杂纳米结构, 并实现其低成本和规模化制备. 种子介导化学沉积是实现 CTP 结构的另一类可行方法 [37][38][39][40][41][42][43][44] .…”

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Tunable Charge Transfer Plasmon at Gold/Copper Heterointerface

Zhu¹,

Song²,

Deng³

2020

Acta Chim. Sinica

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Metal nanostructures with localized surface plasmon resonance (LSPR) have attracted great attention in catalysis, sensing, nanooptics, and nanomedicine. Charge transfer plasmon (CTP) is a LSPR mode that strongly depends on a conductive junction between metallic nanounits. Benefitting from the charge transfer junction, CTP provides a facile way to generate widely tunable LSPR with highly localized/enhanced light magnetic field and photothermal effect. The limited availability of highly tunable CTP structures and their fabrication techniques hinders a further pursuit of their functions and applications. In response to this situation, the present work aims at developing a simple while highly efficient synthetic route to width-adjustable Au/Cu heterojunctions capable of evoking tunable CTP behaviors. The strategy relies on a non-specific surface adsorption of low-cost, naturally occurred fish sperm DNA on a gold nanoseed to control heterogeneous copper nucleation. Such a process offers a chance to tailor the contact area between the gold and copper nano-domains in the bimetallic structure. Highly tunable CTP resonance from visible to near-infrared region is then realizable on the basis of this method. Experimental and calculated extinction spectra consistently reveal three key variables for the CTP structure, including the width of conductive junction and the sizes of gold and copper particles. These parameters are associated with DNA coverage, copper precursor concentration, and the synthetic conditions for gold nanoparticles, which allow for a CTP tuning from visible to near infrared wavelengths. By fully exploiting these highly controllable parameters, the maximally achievable CTP wavelength readily enters a near infrared II domain. The resulting CTP signals have a red-shift of up to 750 nm relative to the 530～570 nm LSPR peaks of individual gold and copper nanoparticles, corresponding to a very narrow Au/Cu conductive contact of 11～13 nm in width. The role of nonspecific DNA adsorption in the above process proves unique (currently irreplaceable) compared to other molecular adsorbates. The easily tunable Au/Cu heterointerface paves a way to integrated CTP and catalytic/sensing functions in future research.

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Chemically modified nanofoci unifying plasmonics and catalysis

Abstract: Chemical modifiability is achieved for self-assembled plasmonic nanogaps to enable charge transfer plasmon resonance and unified plasmonic and catalytic functions.

Cited by 15 publications

References 59 publications

Tunable Planar Focusing Based on Hyperbolic Phonon Polaritons in α‐MoO₃

Tunable Planar Focusing Based on Hyperbolic Phonon Polaritons in α‐MoO₃

Good's buffers have various affinities to gold nanoparticles regulating fluorescent and colorimetric DNA sensing

Tunable Charge Transfer Plasmon at Gold/Copper Heterointerface

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Chemically modified nanofoci unifying plasmonics and catalysis

Abstract: Chemical modifiability is achieved for self-assembled plasmonic nanogaps to enable charge transfer plasmon resonance and unified plasmonic and catalytic functions.

Cited by 15 publications

References 59 publications

Tunable Planar Focusing Based on Hyperbolic Phonon Polaritons in α‐MoO3

Tunable Planar Focusing Based on Hyperbolic Phonon Polaritons in α‐MoO3

Good's buffers have various affinities to gold nanoparticles regulating fluorescent and colorimetric DNA sensing

Tunable Charge Transfer Plasmon at Gold/Copper Heterointerface

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Product

Resources

About

Tunable Planar Focusing Based on Hyperbolic Phonon Polaritons in α‐MoO₃

Tunable Planar Focusing Based on Hyperbolic Phonon Polaritons in α‐MoO₃