Influence of pH in Obtaining Indium Tin Oxide Nanoparticles by Microwave Assisted Solvothermal Method

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)CNPq: 485644/2011-8CNPq: 309013/2012-7CNPq: 303542/2015-2Processo FAPESP: 2013/07296-2A systematic study about synthesis of In1-xSnxO2 (ITO) n) nno structured crystals by microwaveassistd solvothermal method is repor.ted Different solutionsinusmg In.l(3) OH(2)0 and Sn.l(4) 5H(2)0 precursors in ethylene glycol solvent were prepared in distinct pHs (acid and basic on.es) The syntheses were performed at degrees 0 degrees Cinusmg a hinatmg rate of degrees 0 degrees in(-1)mm(1) and soaking time of 30 minu.tes All the synthesized powders were characterized by X-ray Diffraction (XRD) and Rietveld refinement to study the phase evolution as a function of. pH The materials synthesized in the pH ranging between. 115 and. 119 were further studied by field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) techniq.ues As ITO matenals have many practical applications due to their transpareniny m the visible spectrum, UV-Vis spectroscopy analysis was performed to obtain the optical band gap and the respective optical window

Microwave-assisted hydrothermal synthesis of magnetite nanoparticles with potential use as anode in lithium ion batteries

Rechargeable solid-state batteries have long been considered an attractive power source for a wide variety of applications, and in particular, lithium-ion batteries are emerging as the technology of choice for portable electronics. One of the main challenges in the design of these batteries is to ensure that the electrodes maintain their integrity over many discharge-recharge cycles. Fe3O4 deserves great attention as one of the most important electrode active materials due to its high theoretical capacity (926 mAhg- 1), low cost, being environmental-friendly and naturally abundance in worldwide. A simple strategy to synthesize magnetite nanoparticles (Fe3O4) by microwave-assisted hydrothermal method in a short processing time without further treatment is reported. The material obtained was tested as anode active material for lithium ions batteries. Impedance spectroscopy revealed that small differences in cell performance on cycling observed between samples cannot be strictly correlated to cell resistance. A high reversible capacity of 768.5 mAhg- 1 at 1C over 50 cycles was demonstrated, suggesting its prospective use as anode material for high power lithium ion batteries.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Universidade Estadual Paulista Instituto de QuímicaUniversidade Federal do Rio Grande do Norte Departamento de Engenharia de Materiais Laboratório de Síntese Química de MateriaisUniversidad de Córdoba Laboratorio de Química InorgánicaUniversidade Estadual Paulista Instituto de Químic

KidReporter: A method for engaging children in making a newspaper to gather user requirements

Abstract not available