Designing Plasmonic Hybrid Nanostructures for Biosensing, Catalysis and Nanoelectronics

Описание: Abstract: Due to unique localized surface plasmon resonance (LSPR) properties and large electromagnetic field enhancement, noble metal-based plasmonic nanoparticles have been widely exploited for various applications. Gold nanoshells (AuNSs), representing one important class of nanostructures with tuneable LSPR peaks in the near-infrared region, have garnered considerable attention in recent years for a verity of biosensing and biomedical applications. Recently Jin and coworkers developed a new class of multifunctional hybrid AuNSs with ultrathin AuNSs and varied, functional (nonplasmonic) core components ranging from “hard” semiconductor quantum dots and superparamagnetic NPs to “soft” liposomes made using poly-L-histidine as a template to direct Au deposition, and explored its use for biosensing, multimodal imaging and controlled release; [1-3]. and the magnetic-plasmonic Fe3O4/Au core-shell NP enables a new biological imaging method –magnetomotive photoacoustic (mmPA) imaging, which offers remarkable contrast enhancement and improved specificity compared with photoacoustic images using conventional NP contrast agents [3]. We reported recently also a smart enzyme-responsive Ag/Au bimetallic NS system [4] and exploit it for sensitive nanoplasmonic glucose sensing, in situ nanoplasmonic probing of surface-confined enzymatic activity of GOx, and fast and sensitive in-vitro cancer cell imaging and screening. We also prepared a series of functional plasmonic NPs as SERS nanoprobes for single-cell studies to reveal molecular mechanisms involved during the stimuli-induced cell apoptosis process. Very recently, based on shell-isolated AuNPs system, we revealed a long-range plasmon field and plasmoelectric effect on catalysis by using p-nitrophenol as a model reaction and shell thickness-tunable and pinhole-free Au@SiO2 core-shell NPs as photocatalysts and sensing probes [4] Furthermore, by preparing shell-insulated Au@SiO2 NPs into 2D nanomembrane, we further revealed a surprising and unusual plasmon-mediated/enabled long-range electron transport regime (p-tunneling) of the system [5], and further exploited it as meta-surfaced electrode for ultrasensitive electrochemiluminescence (ECL) biosensing with over 1000-fold ECL enhancement [6] These findings will provide new insights into the understanding of plasmonic effects on catalysis and electron transport, and will benefit for the design of novel plasmonic nanocatalysts and nanocircuits.

Keywords: Plasmonic nanostructure; biosensing; nanomedicine; catalysis; nanoelectronics.

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