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http://users.encs.concordia.ca/~mojtaba/elec6271/silver%20nanoparticles.pdf

Silver nanoparticles: green synthesis and their antimicrobial activities.

A one-step simple synthesis of silver colloid nanoparticles with controllable sizes is presented. In this synthesis, reduction of [Ag(NH3)2]+ complex cation by four saccharides was performed. Four saccharides were used:  two monosaccharides (glucose and galactose) and two disaccharides (maltose and lactose). The syntheses performed at various ammonia concentrations (0.005−0.20 mol L-1) and pH conditions (11.5−13.0) produced a wide range of particle sizes (25−450 nm) with narrow size distributions, especially at the lowest ammonia concentrations. The average size, size distribution, morphology, and structure of particles were determined by dynamic light scattering (DLS), transmission electron microscopy (TEM), and UV/Visible absorption spectrophotometry. The influence of the saccharide structure (monosacharides versus disaccharides) on the size of silver particles is briefly discussed. The reduction of [Ag(NH3)2]+ by maltose produced silver particles with a narrow size distribution with an average size of ...

Silver Colloid Nanoparticles: Synthesis, Characterization, and Their Antibacterial Activity

Surface modification of inorganic nanoparticles for development of organic–inorganic nanocomposites—A review

Progress in preparation, processing and applications of polyaniline

Simultaneous in situ reduction of hexachloroplatinic acid by the amine group in the pyrrole monomer and oxidation of pyrrole to form polypyrrole (PPy) was examined. The reactions were performed at various temperatures to understand the degree of reduction of platinum precursor as well as doping of polypyrrole with Pt(II) chloro-complex. Spectroscopic images revealed different morphologies for the Pt/PPy nano-composite prepared at various temperatures. The as-prepared Pt/PPy nano-composite samples were tested for their ability to sense liquefied petroleum gas (LPG) which resulted in excellent sensing at relatively low temperature. The porous nature and ohmic contact between the PPy and platinum nanoparticles makes the as-prepared Pt/PPy nano-composite highly useful for sensors as well as electronic applications.

Chemically designed Pt/PPy nano-composite for effective LPG gas sensor.

Synthesis of InP nanocrystals from indium chloride and sodium phosphide by solution route

An ecofriendly procedure for the synthesis of graphene–titanium dioxide nanocomposites (GTNC) has been developed by dispersing nano-titanium dioxide (TiO2) and graphene nanosheets (GNSs) in ethanol via ultrasonication followed by microwave irradiation. Such nanohybrids were characterized by X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM), Fourier Transform Infrared Spectroscopy (FTIR) and Raman spectroscopy. We have also demonstrated the synthesis of highly conductive composites like poly(3,4-ethylenedioxythiophene)polystyrene sulphonate (PEDOT:PSS)–GTNC, polyvinyl acetate (PVAc)–GTNC, PEDOT:PSS–graphene, and PVAc–graphene by ultrasonication followed by hot compaction towards their thermoelectric application. The filler (graphene, GTNC) concentration and polymer matrix were judiciously varied and optimized for the sake of high electrical conductivity and Seebeck coefficient which leads to a higher power factor (PF). The PVAc based composite with a composition of PVAc (20%) and GTNC (80%) was found to be the most promising material with an electrical conductivity of 2.6 × 104 S m−1 and a Seebeck coefficient of −42 μV K−1 at room temperature (RT). As a result, the PF reaches 47 μW m−1 K−2 at RT which is approximately 37 times, 5 times and 3 times higher than that for the PVAc–graphene based composite, the PEDOT:PSS–GTNC based composite and the PEDOT:PSS–graphene based composite respectively. The origin of the thermoelectric performance of the GTNC composite seems to be from the synergistic effect of graphene nanosheets and TiO2 nanoparticles. The composite shows a large power factor value without using any conducting polymer.

Pawan K. Khanna

Papers

Chemically designed Pt/PPy nano-composite for effective LPG gas sensor.

Synthesis of InP nanocrystals from indium chloride and sodium phosphide by solution route

Polymer based graphene/titanium dioxide nanocomposite (GTNC): an emerging and efficient thermoelectric material

Probing the real-time photocatalytic activity of CdS QDs sensitized conducting polymers: Featured PTh, PPy and PANI

BaTiO 3 nanostructures for H 2 S gas sensor: Influence of band-gap, size and shape on sensing mechanism