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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

Lead-free novel n-type ternary nanohybrids were fabricated by blending separately synthesized, diamond like I–III–VI2 and I–V–VI2 (I-Cu, Ag, III-In, V-Sb, VI-Se) nanocrystals (NCs) in a multi-walled carbon nanotube (MWCNT) and polyaniline (PANI) matrix. A thermoelectric study of these nanohybrids was performed at room temperature in order to understand their utility as potential thermoelectric materials for advanced applications. Electrical conductivity, thermal conductivity and Seebeck coefficient were measured and the thermoelectric performance was evaluated at room temperature. All ternary nanohybrids revealed an n-type behavior with relatively higher electrical conductivity in the order of 103 S m−1. Among the CuInSe2 (CIS), AgInSe2 (AIS) and CuSbSe2 (CSS)-based hybrids, chalcostilbite (i.e., CSS/MWCNT/PANI) showed a good performance at room temperature with a power factor of 1.16 μW m−1 K−2 and Seebeck coefficient of −23.5 μV K−1. A possible mechanism of the charge transport for the ternary hybrid was also discussed. The present article highlights the potentiality of different lead-free ternary metal selenide NPs in hybrid forms for thermoelectric applications.

Ternary metal selenide/MWCNT/PANI: potential n-type nanohybrids for room-temperature thermoelectric applications.

Instant Synthesis of White Light-Emitting Cd Chalcogenide Nanoclusters Using Homogenization Method

Nearly mono‐disperse high quality quantum dots (QDs) of zinc selenide have been synthesized by organometallic route that includes use of well known surfactants such as a carboxylic acid and trioctylphosphine (TOP). Single‐step synthesis was performed at a temperature that is lower than many reported methods for such quantum dots of semiconductors. UV‐Visible spectra of series of experiments showed steep absorption band at about 418 nm (Eg=∼3.0 eV). Photoluminescence measurement revealed band‐edge emission at ∼431 nm from the ZnSe QDs. The particle size was found to be between 3–5 nm as calculated by Scherrer equation at crystal plane of the hexagonal crystal structure of ZnSe. Particle size‐distribution by dynamic light scattering technique showed narrow‐size distribution of the particles within 10 nm. The particles are highly re‐dispersible in organic solvents such as n‐hexane and toluene thus making the dots useful for opto‐electronic devices.

Nearly Mono‐disperse Quantum Dots of ZnSe: Synthesis and Characterization

Surface Engineering of CdS Quantum Dots for Photocatalytic Applications under Direct Sunlight

Herein we describe synthesis of ZnO nanoparticles by using alkaline solution of ZnX2 (X = NO3, Cl) under ultrasound energy of 20 KHz. The reaction can be completed in about 1-2 hours. As prepared powders were analyzed by XRD measurement to find that the product is hexagonal phase pure ZnO. UV-Visible measurement of aq. solution showed absorption band at -365 nm and photoluminescence (PL) indicated multiple bands in visible region due to deep traps owing to high temperature sintering. The hydrophilicity can be imparted by use of a suitable polyelectrolyte. Freshly prepared samples showed good dispersion in aqueous and alcoholic medium. The thick films derived from the ZnO nano-particles showed excellent sensing for hydrogen sulphide gas.

Pawan K. Khanna

Papers

Ternary metal selenide/MWCNT/PANI: potential n-type nanohybrids for room-temperature thermoelectric applications.

Instant Synthesis of White Light-Emitting Cd Chalcogenide Nanoclusters Using Homogenization Method

Nearly Mono‐disperse Quantum Dots of ZnSe: Synthesis and Characterization

Surface Engineering of CdS Quantum Dots for Photocatalytic Applications under Direct Sunlight

Sono-chemical synthesis of ZnO nano-particles and their application in hydrogen sulphide gas sensing.