2016
DOI: 10.1039/c5nr08788k
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Stable ligand-free stellated polyhedral gold nanoparticles for sensitive plasmonic detection

Abstract: Ligand-free stellated gold nanoparticles (AuStNPs) with well-defined octahedral (O(h)) and icosahedral (I(h)) core symmetries were prepared using hydrogen peroxide as a reducing agent. Only three reagents: gold precursor (HAuCl4), H2O2 and NaOH were required to form colloidally and chemically stable AuStNPs with a zeta-potential between -55 and -40 mV indicative of excellent charge stabilization. The size and degree of stellation of AuStNPs can be controlled by several synthetic parameters so that the localize… Show more

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Cited by 16 publications
(24 citation statements)
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“…At the same time, increasing AA concentration above 2.5 × 10 −3 m (e.g., 5 × 10 −3 m ; 4:1 AA‐to‐Au molar ratio) results in blueshift with the decrease in LSPR intensity. Thus, AA is also found to function as a shape selective agent by favoring star‐like structures through the kinetics of the growth . Optimal AA concentrations for the studied conditions of the photochemical synthesis of AuNSs using Au(I)‐thiolate precursor are found to be in the range of 1.25–2.5 × 10 −3 m (AA‐to‐Au molar ratios from 1:1 to 2:1).…”
Section: Photochemical Synthesis Of Aunssmentioning
confidence: 91%
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“…At the same time, increasing AA concentration above 2.5 × 10 −3 m (e.g., 5 × 10 −3 m ; 4:1 AA‐to‐Au molar ratio) results in blueshift with the decrease in LSPR intensity. Thus, AA is also found to function as a shape selective agent by favoring star‐like structures through the kinetics of the growth . Optimal AA concentrations for the studied conditions of the photochemical synthesis of AuNSs using Au(I)‐thiolate precursor are found to be in the range of 1.25–2.5 × 10 −3 m (AA‐to‐Au molar ratios from 1:1 to 2:1).…”
Section: Photochemical Synthesis Of Aunssmentioning
confidence: 91%
“…During the synthesis of AgNPs, hydrogen peroxide can serve as a reagent that establishes equilibrium in AgNP formation and thus controls the shape selection . At the same time, hydrogen peroxide is known to function as a reducing agent in the formation of AuNPs . In our synthesis of AuNSs, we explored the effect of hydrogen peroxide in the photochemical process in order to understand its effect on size and LSPR of AuNSs.…”
Section: Photochemical Synthesis Of Aunssmentioning
confidence: 99%
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“…In a similar context, Krajczewski et al synthesized a star-shaped silica-coated gold nanoparticle with a higher number of edges [ 39 , 56 ]. They used HAuCl 4 as a gold precursor, H 2 O 2 as a reducing agent, and NaOH to trigger the reduction reaction and stabilize the gold nanostar nanoparticle.…”
Section: Synthesis Of Shinsmentioning
confidence: 99%
“…
have led to countless applications in various fields. As an example, supported on a substrate they have been proposed for surface-enhanced spectroscopy, [11][12][13][14] catalysis, [15][16][17] sensing, [14,18,19] and diverse photonic applications [20] that take advantage of the properties of individual nanoparticles [21] or of the collective resonances of phased arrays [6,8,22] to name a few.Control on the nanoscale geometry is commonly achieved by patterning thin films via lithography techniques followed by evaporation and lift-off processes or etching. [23] Such top-down nanofabrication steps not only are expensive, time consuming, and hardly scalable, but produce materials that are polycrystalline, have substantial surface roughness or present damages as a result of etching.
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mentioning
confidence: 99%