2013
DOI: 10.1021/jp4063077
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Synthesis of Spiky Ag–Au Octahedral Nanoparticles and Their Tunable Optical Properties

Abstract: Spiky nanoparticles exhibit higher overall plasmonic excitation cross sections than their nonspiky peers. In this work, we demonstrate a two-step seed-mediated growth method to synthesize a new class of spiky Ag–Au octahedral nanoparticles with the aid of a high molecular weight poly(vinylpyrrolidone) polymer. The length of the nanospikes can be controlled from 10 to 130 nm with sharp tips by varying the amount of gold precursor added and the injection rates. Spatially resolved electron energy-loss spectroscop… Show more

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Cited by 52 publications
(52 citation statements)
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“…All in all, these results confirm the hollow (cage‐like) nature of the multiply‐branched gold nanoparticles obtained via our one‐pot seedless process. It is worth noting here that hollow gold nanoparticles with a similar cage‐like morphology are typically synthesized by performing galvanic replacement reactions on pre‐formed silver or cobalt nanoparticles, resulting in hollow nanoparticles with either a spiky or a smooth surface . Only a few examples can be found in the literature reporting on the one‐pot seedless formation of hollow gold nanoparticles, one being the nanoboxes that He et al have synthesized through a surfactantless co‐reduction of HAuCl 4 and AgNO 3 , which resulted in a Ag–Au alloy .…”
Section: Resultsmentioning
confidence: 99%
“…All in all, these results confirm the hollow (cage‐like) nature of the multiply‐branched gold nanoparticles obtained via our one‐pot seedless process. It is worth noting here that hollow gold nanoparticles with a similar cage‐like morphology are typically synthesized by performing galvanic replacement reactions on pre‐formed silver or cobalt nanoparticles, resulting in hollow nanoparticles with either a spiky or a smooth surface . Only a few examples can be found in the literature reporting on the one‐pot seedless formation of hollow gold nanoparticles, one being the nanoboxes that He et al have synthesized through a surfactantless co‐reduction of HAuCl 4 and AgNO 3 , which resulted in a Ag–Au alloy .…”
Section: Resultsmentioning
confidence: 99%
“…The Ag also provides a reductive condition on the tips of Au crystals caused by the galvanic current, and the Ag on the tips can be nearly replaced with Au. However, this method results in significant contamination of Ag in the core of Au nanostructures 43,44 . The remaining Ag and Ag can produce side effects in applications especially in biomedical use .…”
Section: Regulation and Acceleration In Crystal Growthmentioning
confidence: 99%
“…Since the first report of Au nanocages synthesized from Ag nanocubes, various hollow Au nanoshell structures have been prepared using Ag nanospheres [144][145][146][147][148][149][150][151][152][153][154][155], Ag nanorods [156][157][158][159], Ag nanowires [160], and even Ag islands on two-dimensional surfaces as templates [161].…”
Section: Hollow Nanoshellsmentioning
confidence: 99%