Chemical modification of poly(n-hexylsilane) – Synthesis of functional polysilanes bearing thienyl groups on the appended sila-alkyl side chains and their application in the generation and stabilization of silver nanoparticles

Shankar, Ravi; Shahi, Vandana

doi:10.1016/j.jorganchem.2007.10.052

Cited by 23 publications

(19 citation statements)

References 52 publications

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“…13 In addition, we have also demonstrated that the use of functional polysilanes bearing thienyl or furyl donor groups on the appended silaÀalkyl side chains is advantageous to afford polymerÀmetal composites containing silver and palladium nanoparticles with long shelf life stability. 14,15 The passive behavior of these nanoparticles toward agglomeration in the functional polymer matrix originates from donorÀ acceptor interaction between thienyl/furyl group and the nanometal surface.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Fluorescent Polymer−Metal Nanocomposites Comprising Poly(silylene-co-silyne)s and Silver Nanoparticles

2011

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Fluorescent Polymer−Metal Nanocomposites Comprising Poly(silylene-co-silyne)s and Silver Nanoparticles

2011

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“…To generate metal NPs using photochemical reduction, Tamai and coworkers mixed metal precursors (HAuCl 4 , AgNO 3 , or Na 2 PdCl 4 with photo-initiator (PMPS) decorated PS MS. 63 Upon irradiation by UV, oxidative decomposition of PMPS and reduction of metal ions occurred concurrently, forming hybrid metal NP-polymeric particles (Fig. 4).…”

Section: In-situ Modification Of Nanoparticlementioning

confidence: 99%

The Design and Applications of Nanoparticle Coated Microspheres in Immunoassays

Lin¹,

Carey²

2014

j. nanosci. nanotech.

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Nanoparticle coated microspheres are composed of two or more materials with a core/shell structure and exhibit unique abilities that allow amplification of trace targets in immunoassays. The preparation of nanoparticle coated microspheres can be accomplished using three main strategies: (1) in-situ, (2) ex-situ, and (3) hollow sphere methods. Antibodies or biomolecules can be immobilized on the surface of nanoparticle coated microspheres or hollow spheres to carry out detection of targets using surface-enhanced resonance spectroscopy (SERS), fluorescence, electrochemistry, and many others. Using these particles as antibody carriers in SERS-based immunoassays, broad dynamic range and low detection limits, and improved selectivity can be realized. By assistance of nanoparticle coated microspheres in immunoassays, improved sensitivity and selectivity has been realized. In this review, nanoparticle coated microsphere generation, recent applications, and future potential with respect to immunoassays are discussed.

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“…A few copolymer templates incorporating polysilane units [R 2 Si] n have been utilized for the synthesis of silicon‐based polymer–metal nanocomposites which exhibit excellent catalytic properties in many organic transformations, including hydrogenation, Suzuki, Sonagashira coupling, and hydrosilylation reactions 6–11. It has been shown that donor ability of the appended 2‐theinyl/2‐furyl groups on the sila‐alkyl side chains in linear polysilanes imparts better stabilization of Ag and Pd nanoparticles 12, 13. Poly(alkyl‐arylsilane)s, [R(C 6 H 4 R 1 )Si] n (R 1 = H, p ‐Me, p ‐OMe, p ‐NMe 2 ) with electron withdrawing/electron releasing substituents on the phenyl groups are found to be interesting precursors for “size controlled” synthesis of Ag and Pd nanoparticles 14.…”

Section: Introductionmentioning

confidence: 99%

Scope of network polysilanes in the synthesis of fluorescent silver and gold nanoparticles/nanoclusters‐modulations of their optical properties in the presence of Hg(II) ions

Shankar

Sahoo

2011

J. Polym. Sci. A Polym. Chem.

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The network polysilanes (polysilynes) [RMe2SiCH2CH2Si]n, [R=Ph (1), 2‐Furyl (2)] have been synthesized by room temperature reaction of the corresponding organotrichlorosilane with Na dispersion in tetrahydrofuran (THF) medium. The method allows the formation of high molecular weight polymers [Mw/PDI = 10,504/2.2 (1), 9176/1.5 (2)] in improved yields than those obtained from classical Wurtz coupling reaction (Na, toluene, 110 °C). These polymers act as reducing agents for Ag(I) and Au(III) ions to afford stable metal nanoparticles of 4–8 nm size domains in toluene medium. The corresponding polymer–silver nanocomposites, 1a and 2a, are fluorescent in the green light region (λmax = ∼ 530 nm) due to the formation of silver nanoclusters (AgNCs) along with the nanoparticles (AgNPs). A simple chemical approach has been developed to modulate the plasmonic and emission intensities of the nanocomposite 1a by reacting with varying concentrations (10−12 to 10−7M) of HgI2 in toluene. The method allows enhancement of the fluorescence intensity associated with AgNCs. The results are explained by invoking coupling between the energies of surface plasmon resonance and the nanocluster electronic transition. The polymer–gold nanocomposites, 1b and 2b, are non‐fluorescent and the plasmonic resonance at 530 nm associated with AuNPs is found to be insensitive to Hg(II) ions. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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Chemical modification of poly(n-hexylsilane) – Synthesis of functional polysilanes bearing thienyl groups on the appended sila-alkyl side chains and their application in the generation and stabilization of silver nanoparticles

Cited by 23 publications

References 52 publications

Synthesis and Characterization of Fluorescent Polymer−Metal Nanocomposites Comprising Poly(silylene-co-silyne)s and Silver Nanoparticles

Synthesis and Characterization of Fluorescent Polymer−Metal Nanocomposites Comprising Poly(silylene-co-silyne)s and Silver Nanoparticles

The Design and Applications of Nanoparticle Coated Microspheres in Immunoassays

Scope of network polysilanes in the synthesis of fluorescent silver and gold nanoparticles/nanoclusters‐modulations of their optical properties in the presence of Hg(II) ions

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