Synthesis, Stability, and Surface Plasmonic Properties of Rhodium Multipods, and Their Use as Substrates for Surface‐Enhanced Raman Scattering

Zettsu, Nobuyuki; McLellan, Joseph M.; Wiley, Benjamin J.; Yin, Yadong; Li, Zhiyuan; Xia, Younan

doi:10.1002/anie.200503174

Cited by 138 publications

(117 citation statements)

References 38 publications

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“…In our previous research, two different Rh NP have been synthesized: tripod stars [69,71] and nanocubes [70]. On the one hand, Watson et al [69] synthesized and experimentally examined the properties of Rh tripods by means of SERS, surface enhanced fluorescence, and photoinduced degradation of a typical compound like p-aminothiophenol (PATP).…”

Section: Rhodiummentioning

confidence: 99%

Plasmonics in the Ultraviolet with Aluminum, Gallium, Magnesium and Rhodium

et al. 2018

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Ultraviolet plasmonics (UV) has become an active topic of research due to the new challenges arising in fields such as biosensing, chemistry or spectroscopy. Recent studies have pointed out aluminum, gallium, magnesium and rhodium as promising candidates for plasmonics in the UV range. Aluminum and magnesium present a high oxidation tendency that has a critical effect in their plasmonic performance. Nevertheless, gallium and rhodium have drawn a lot of attention because of their low tendency of oxidation and, at the same time, good plasmonic response in the UV and excellent photocatalytic properties. Here, we present a short overview of the current state of UV plasmonics with the latest findings in the plasmonic response and applications of aluminum, gallium, magnesium and rhodium nanoparticles.

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Section: Rhodiummentioning

confidence: 99%

Plasmonics in the Ultraviolet with Aluminum, Gallium, Magnesium and Rhodium

et al. 2018

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“…[10], [11]. Recently, rhodium multipods were made by a polyol process using rhodium chloride as the precursor of Rh [12]. Until now, no ferromagnetic magnetic multibranched nanostructure have been fabricated by the colloidal method.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Multipods Fabricated by Solution Phase Synthesis and Hydrogen Reduction

et al. 2007

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A simple approach combining pyrolysis and hydrogen reduction is formulated for making ferromagnetic-branched nanostructures called Co multipods. The CoO multipods (branched nanostructures) were produced through the pyrolysis of cobalt-oleate in octadecane at 280 C with the presence of oleic acid under the protection of pure nitrogen. The angles between the nearest arms are 90 . After the reduction of the branched CoO nanostructures in flowing hydrogen gas in a tubular oven at 290 C, the CoO is reduced to pure cobalt with hexagonal crystal structure and the branched shapes are retained. Anisotropic magnetic properties were found for cobalt multipods on silicon substrates.

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“…12,18,19,20,21,22 Gold nanostructures, such as nanorods, nanowires, tetrapods, nanoplates and star-shaped particles are particularly attractive for many applications because of their strong confinement of the electromagnetic field and high enhancement that can be tuned over a wide range of optical wave lengths in comparison with ordinary spherical structures. 11,[23][24][25][26][27] Combination of the metal nanostructure with a support material, such as in core-shells, raspberries, and crescents, affords additional advantages in tuning optical properties, improved chemical/mechanical stability, and ease of handling compared to free-standing nanoparticles.Batch methods, 20 specialized ligands 28 and additional electrochemical treatments 29 have typically been needed to synthesize these optical architectures, but create challenges in achieving desired optical properties and sufficient reproducibility. Herein we develop a method based on molecular self-assembly and reduction chemistry of gold species to grow gold nanobranches on the surface of silica nanoparticles.…”

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confidence: 99%

Engineering the synthesis of silica–gold nano-urchin particles using continuous synthesis

2014

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Compared to freestanding nanoparticles, supported nanostructures typically show better mechanical stability as well as ease of handling. Unique shapes such as core-shells, raspberries and crescents have been developed on supported materials to gain improved chemical and optical properties along with versatility and tunability. We report the formation of hyperbranched gold structures on silica particles, silica-gold nano-urchin (SGNU) particles. Kinetic control of crystallization, fast mass transfer as well as a bumped surface morphology of the silica particles are important factors for the growth of gold branches on the silica support. Using a microfluidic platform, continuous synthesis of SGNUs is achieved with increased reaction rate (less than 12 min. of residence time), better controllability and reproducibility than that obtained in batch synthesis. The hyper-branched gold structures display surfaceenhanced Raman scattering (SERS). Introduction.Microfluidic systems offer excellent conditions for synthesis of nanomaterials by control of mixing, temperature, and pressure combined with fast heat and mass transfer. 1, 2 Moreover, they enable controlled synthesis under higher temperature and pressure conditions than typically feasible in batch with resulting faster synthesis. 1, 3 Herein, we report batch and microfluidic synthesis of hyper-branched gold structures on silica particles, silica-gold nano-urchin (SGNU) particles. The formed particles consist of a dielectric silica core decorated with densely packed gold nanobranches stretching outward. The morphology serves as an active substrate for tip-enhanced Raman scattering, 4 and could additional have applications in catalysis and bio-imaging. 5,6 Gold nanoparticles have been synthesized by a variety of approaches for diverse applications in catalysis, bio-imaging, drug delivery and photovoltaics. Their surface plasmon resonance (SPR) and surface enhanced Raman scattering (SERS) properties have been of particular interest for photothermal therapy and molecular sensing, respectively [7][8][9][10][11][12][13][14][15] . SERS active structures have been fabricated by complex with top-down methods, 4,12,16,17 but wet-chemical synthesis of gold nanoparticles offer potential advantages in simple, high yield, and limited scalable synthesis. 12,18,19,20,21,22 Gold nanostructures, such as nanorods, nanowires, tetrapods, nanoplates and star-shaped particles are particularly attractive for many applications because of their strong confinement of the electromagnetic field and high enhancement that can be tuned over a wide range of optical wave lengths in comparison with ordinary spherical structures. 11,[23][24][25][26][27] Combination of the metal nanostructure with a support material, such as in core-shells, raspberries, and crescents, affords additional advantages in tuning optical properties, improved chemical/mechanical stability, and ease of handling compared to free-standing nanoparticles.Batch methods, 20 specialized ligands 28 and additional electrochemical treat...

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Synthesis, Stability, and Surface Plasmonic Properties of Rhodium Multipods, and Their Use as Substrates for Surface‐Enhanced Raman Scattering

Cited by 138 publications

References 38 publications

Plasmonics in the Ultraviolet with Aluminum, Gallium, Magnesium and Rhodium

Plasmonics in the Ultraviolet with Aluminum, Gallium, Magnesium and Rhodium

Ferromagnetic Multipods Fabricated by Solution Phase Synthesis and Hydrogen Reduction

Engineering the synthesis of silica–gold nano-urchin particles using continuous synthesis

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