Poly(ionic liquid)-assisted one-pot synthesis of Au hyperbranched architectures for enhanced SERS performances

Feng, Jiu‐Ju; Liu, Lei; Huang, Hong; Wang, Ai‐Jun

doi:10.1016/j.snb.2016.07.031

Cited by 27 publications

(3 citation statements)

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“…Metal nanoparticles (NPs), such as nanospheres (NSs), have interesting size-dependent optical, electronic, chemical, and electrochemical properties which are useful for a wide variety of applications in catalysis, − optical detection, , electronic/electrochemical sensing, − photovoltaics, nanoelectronics, imaging, therapeutics, , and plasmonics . For these different applications the size plays an important role in the function.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Assembly Method on the Surface Area-to-Volume Ratio and Electrochemical Oxidation Potential of Metal Nanospheres

2019

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Here we report that the peak oxidation potential (E p,ox ) of electrode-attached Au nanospheres (NSs) in anodic stripping voltammetry (ASV) experiments depends on the electrochemically measured surface area-to-volume ratio (SA/V). The SA/V in turn depends on the method of NS assembly onto the electrode, which results in different E p,ox values for the same-sized Au NSs that are assembled in different ways onto the same electrode material. The assembly methods tested on indium tin oxide-coated glass electrodes (glass/ITO) include electrostatic attachment to an amine-functionalized silane linker, electrophoretic deposition (EPD), direct drop-cast deposition, and drop-cast deposition after mixing with carbon black. The measured SA/V of same-sized NSs follows the order of silane linker > EPD > drop-cast with carbon black > direct drop-cast. The E p,ox decreases as the SA/V increases as controlled by the assembly method. The measured E p,ox for the Au NSs correlated to the measured SA/V better than the actual NS diameter. These findings reveal important information about what ultimately controls the oxidative stability of metal NSs and can help to explain previously described electrode effects on metal NS oxidation potentials. These results also provide guidelines for choosing an assembly method that optimizes the SA/V for performance and stability against oxidation or ripening (size increase).

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Section: Introductionmentioning

confidence: 99%

Impact of the Assembly Method on the Surface Area-to-Volume Ratio and Electrochemical Oxidation Potential of Metal Nanospheres

2019

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“…In previous work, reversible SERS substrates have been fabricated, but the reported approaches rely on the dye-labeled metal nanoparticles, then altering the conformation of the substrate to produce the desired SERS signal. [1][2][3][4][5][6][10][11][12][13] Unlike previously reported approaches, our substrate involves a joint component that PILs possess unique anionexchange properties, analytes can be easily introduced by the exchange of paired anions, [15][16][17] which offers more flexibility for the system.…”

Section: Introductionmentioning

confidence: 99%

Poly(ionic liquid)s‐Based Thermal‐Responsive Microgel for Use as SERS Substrates with “ON–OFF” Switchable Effect

Chen,

Wang,

Wan

et al. 2024

Macromol. Rapid Commun.

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A temperature‐responsive surface‐enhanced Raman scattering (SERS) substrate with “ON‐OFF” switching based on poly(ionic liquid)s (PILs) block copolymer microgels has been designed and synthesized. The PILs units act as a joint component to anchor the gold nanoparticles (AuNPs) and analytes onto poly(N‐isopropylacrylamide) (PNIPAm). This anchor allows the analytes to be fixed at the formed hot spots under temperature stimulus. Owing to the regulation of PNIPAm segment, the SERS substrates exhibited excellent thermally responsive SERS activity with reversible “ON‐OFF” effect. Additionally, because of the anion‐exchange of PILs, microgels can introduce new analytes, which offers more flexibility for the system. The substrate shows excellent reversibility, controllability and flexibility of SERS activity, which is expected to have a broad application in the field of practical SERS sensors.This article is protected by copyright. All rights reserved

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“…Hyperbranched structures are well-demonstrated for noble metal NCs − but are less-so for semiconductor NCs. Kanaras et al reported synthesis of highly crystalline hyperbranched CdSe particles and CdTe NCs using dissolved Se and Te powders in tri-n-octylphosphine (TOP).…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis and Assembly of Hyperbranched Supra Quantum Dot CdE (E = S, Se, Te) Nanocrystals

Yazdanparast

McLaurin

2019

Crystal Growth & Design

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Dichalcogenides are alternatives for synthesis of nanometal chalcogenides, which provides a variety of precursors with different reactivities. Using disulfide, diselenide, and ditelluride and their mixtures, metal chalcogenide nanocrystals (NCs) in which structures vary from spherical NCs with diameters of ∼4 nm to large, hyperbranched NCs with diameters approaching 200 nm are synthesized. Study of the effects of the reaction temperature, concentration and ratio of reactants shows that hyperbranched supra quantum dots (HSQDs) form in three steps: nucleation, aggregation, and kinetically controlled growth. By tuning the concentration of precursors and reaction temperature, both aggregation and growth can be modulated and tetrapod NCs with arms of tunable length and thickness can be prepared. The more reactive precursor forms small NCs, which work as a platform for formation of the arms from the less reactive precursor, providing controlled growth on the more reactive facets. By controlling the precursor ratio, the composition of the HSQDs can be controlled.

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Poly(ionic liquid)-assisted one-pot synthesis of Au hyperbranched architectures for enhanced SERS performances

Cited by 27 publications

References 50 publications

Impact of the Assembly Method on the Surface Area-to-Volume Ratio and Electrochemical Oxidation Potential of Metal Nanospheres

Impact of the Assembly Method on the Surface Area-to-Volume Ratio and Electrochemical Oxidation Potential of Metal Nanospheres

Poly(ionic liquid)s‐Based Thermal‐Responsive Microgel for Use as SERS Substrates with “ON–OFF” Switchable Effect

Microwave-Assisted Synthesis and Assembly of Hyperbranched Supra Quantum Dot CdE (E = S, Se, Te) Nanocrystals

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