Uniform polystyrene microspheres decorated with noble metal nanoparticles formed without using extra reducing agent

Ou, Jinn Luh; Chang, Chih-Hao; Sung, Youngje; Ou, Keng Liang; Tseng, Chun-Chieh; Ling, Hao; Ger, Ming-Der

doi:10.1016/j.colsurfa.2007.04.038

Cited by 50 publications

(24 citation statements)

References 25 publications

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“…Gold seeds were then linked to the functionalized PS spheres and the PS@metal nanoshell structures were formed by the subsequent reduction of metal onto the Au-seeded PS spheres from metal ion solutions. Results show that amount of CuSO 4 .5H 2 O molar solution and H 2 O 2 are important in controlled preparation of the nanoshells of good quality. A better seed coverage and good quality nanoshells are produced with big quantity .Also the nanostructure have continues absorption from blue shift increase and change to …”

Section: Resultsmentioning

confidence: 99%

“…There has been great attention in noble metal nanoshells, which are composite nanoparticles made of a dielectric core wrapped by a metal shell with a thickness of a few to a few tens nanometers .These nanostructured composite particles possess a helpful optical property of frequency-tunable localized surface plasmon resonance (LSPR) that originates from the resonant optical excitation of the collective oscillation of conduction electrons in the metal [1][2][3][4]. By varying the relative geometric dimensions of the dielectric core and the metal shell, the resonance of a nanoshell may be tuned over hundreds of nanometers in wavelength from the visible into the infrared region.…”

Section: Introduction -1mentioning

confidence: 99%

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Preparation and Optical Properties of PS @Au-Cu Core-Shell Nano Composite

Rudainah

Farkad²,

2015

ILCPA

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An appropriate low-cost uncomplicated chemical method has been used to obtain the optical properties in the production of plasmon by manufacturing nanomaterial's consisting of dielectric core and a shell that grows on its surface . This core consists of the polystyrene PS and a goldcopper shell. The synthesis was made in two steps . In the first step PS core was fabricated , then coated by a shell consisting of Au -Cu particles . The shell shape differs according to the change in the amount of molar concentrations of Cu, and H2O2. It is found that variation of this materials amount gives us absorbance measurements (Localised Surface Plasmon Resonance, LSPR) that increase proportionally with changing quantities directly, where the size of core is constant .And the peak position in blue shift high energy then changes to red shift low energy . This change depends on the size and shape of particles. The same case applies for the transmittance of its change with the change of this material. The nano shell was characterized by using Scanning electron microscopy,SEM and UV -vis spectroscopy by varying the amount of Cu and H 2 O 2.

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Section: Resultsmentioning

confidence: 99%

Section: Introduction -1mentioning

confidence: 99%

Preparation and Optical Properties of PS @Au-Cu Core-Shell Nano Composite

Rudainah

Farkad²,

2015

ILCPA

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“…[7][8][9][10][11] Nowadays, the preparation of both kinds of nanoparticles, oen being pursued separately, has made signicant progress. [15][16][17][18][19][20][21] On one hand, polymeric NPs have been wisely recruited as templates either for the formation of metal NPs, [22][23][24][25][26] or for the three dimensional arrangement of preformed metal NPs. [12][13][14] Naturally, combining the two kinds of particles together to create hybrid nanoparticles has come into the sight of many researchers.…”

Section: Introductionmentioning

confidence: 99%

Thermosensitive mixed shell polymeric micelles decorated with gold nanoparticles at the outmost surface: tunable surface plasmon resonance and enhanced catalytic properties with excellent colloidal stability

Yin

Wang

et al. 2015

RSC Adv.

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Hybrid particulate composites consisting of noble metal nanoparticles (NPs) and polymeric particles have attracted intensive interest, due to the possibility of combining the precious optical and catalytic properties of the former with the stimuli responsiveness and biocompatibility of the latter. However, it is challenging to prepare hybrid particles that simultaneously have tunable optical and catalytic properties as well as excellent colloidal stability. In the current work, we report a strategy for such hybrid particles, through covalently decorating the outmost surface of mixed shell polymeric micelles (MSPMs) with gold NPs. For this, two block polymers, poly(3-caprolactone)-block-(ethylene glycol) (PCL-b-PEG) and poly(3caprolactone)-block-poly(N-isopropylacrylamide) (PCL-b-PNIPAM), were prepared by ring-opening polymerization and reversible addition fragmentation chain transfer (RAFT) polymerization, respectively. Co-self-assembly of the two block polymers result in MSPMs with a PCL core and a mixed shell consisting of PEG and PNIPAM. At the end of each PNIPAM chain in the shell, thiol groups are introduced to act as anchors for the in situ formation of gold NPs. The number density of the gold NPs is conveniently tuned through varying the relative amount of PEG/PNIPAM in the micellar shell. Reversible shrinking and extension of the PNIPAM chains regulated by temperature can be used to tune the interparticle distance of the gold NPs, while the whole hybrid particles are stabilized by the stretched PEG chains. The hybrid polymeric micelles exhibit thermoresponsive surface plasmon resonance and enhanced catalytic properties as well as excellent colloidal stability. † Electronic supplementary information (ESI) available: XPS, TEM images of gold NP decorated polymeric micelles of PNIPAM or MSPMs of a PEG/PNIPAM mass ratio 1 : 9 aer heating, UV-vis absorption spectra during the reduction of 4-NP catalyzed by pure gold NPs or MSPM@AuNPs aer heating, See

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“…12,13,14 Highly uniform PS spheres have been decorated with noble metal nanoparticles using a soft reduction of metallic cations. 15 This process has been successful with noble metal such as gold (Au), silver (Ag) or palladium (Pd); leading to the formation of metal-PS composites. Metal loaded mesoporous structure provides the benefits of a well-designed support for the adsorbed metallic nanoparticles while preserving their individual electronic properties.…”

Section: Introductionmentioning

confidence: 99%

Polymeric Honeycombs Decorated by Nickel Nanoparticles

Paszternák¹,

Zitoun²

2015

sci adv mater

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Porous 3D metal mesostructures have a wide range of applications in different fields of micro/nanotechnology. We report on the spontaneous formation of honeycomb structures from polystyrene beads colloidal crystal and its simultaneous decoration with magnetic Ni nanoparticles. The honeycomb forms upon simple dipping of the colloidal crystal in an organic solution of an organometallic precursor. Ni nanoparticle formation is based on the gentle thermal decomposition of the organometallic precursor Ni  C 8 H 12 ) 2 at a temperature as low as 80˚C, compatible with the polymeric matrix. Combination of different solvents and preparation parameters are used to get an overview about the formation mechanism of Ni decorated honeycomb structure.

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Uniform polystyrene microspheres decorated with noble metal nanoparticles formed without using extra reducing agent

Cited by 50 publications

References 25 publications

Preparation and Optical Properties of PS @Au-Cu Core-Shell Nano Composite

Preparation and Optical Properties of PS @Au-Cu Core-Shell Nano Composite

Thermosensitive mixed shell polymeric micelles decorated with gold nanoparticles at the outmost surface: tunable surface plasmon resonance and enhanced catalytic properties with excellent colloidal stability

Polymeric Honeycombs Decorated by Nickel Nanoparticles

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