Silver nanoparticles with an average size of ∼5 nm were deposited on the surface of preformed silica submicrospheres with the aid of power ultrasound. Ultrasound irradiation of a slurry of silica submicrospheres, silver nitrate, and ammonia in an aqueous medium for 90 min under an atmosphere of argon to hydrogen (95:5) yielded a silver−silica nanocomposite. By controlling the atmospheric and reaction conditions, we could achieve the deposition of metallic silver on the surface of the silica spheres. The resulting silver-deposited silica submicrosphere samples were characterized with X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, energy-dispersive X-ray analysis, high-resolution transmission electron microscopy, high-resolution scanning electron microscopy, photoacoustic spectroscopy, and Fourier transform infrared, UV−visible, and X-ray photoelectron spectroscopy.

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Nanoparticles of the CuInTe(2) (CIT) and CuInSe(2) (CIS) alloys have been prepared using the microwave-assisted polyol method. In this simple and quick reaction the polyol is both the solvent and the reducing agent. XRD studies show that nanoparticles of CIT and CIS are formed in the body-centered tetragonal structure and their average diameters are approximately 94 and approximately 83 nm, respectively. Electron microscopy studies show that these formed particles are poorly aggregated with a mean diameter of 100 and 85 nm, respectively. The products have been characterized by different analytical techniques, and the electronic properties have been measured using photoacoustic spectroscopy (PAS).

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Nanocrystals of Ag2E (E = Se, Te) were prepared using the polyol reduction method under sonochemical irradiation. Particles were characterized using TEM, HRTEM, SEM, and XRD. The optical properties of the products were studied using photoacoustic spectroscopy (PAS). The differences between the as-prepared samples and single crystals and method of the nanoparticle formation are discussed.

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A microwave-assisted reaction between Mo(CO) 6 and Se has yielded MoSe 2 nanoparticles. Nanorods of MoSe 2 of lengths ranging from 45 to 55 nanometers are identified in the product mixture. The prepared MoSe 2 has been characterized by X-ray powder diffraction measurements, FTIR spectroscopy, photoacoustic spectroscopy (PAS), transmission electron microscopy (TEM) and high resolution TEM (HRTEM).