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

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 21; no. 2; p. 1
• Main Authors: Oliveira, Fernando Modesto Borges de, Varela, José Arana, Orlandi, Marcelo Ornaghi
• Format: Journal Article
• Language: English
• Published: Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 2018; ABM, ABC, ABPol; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: Emission analysis; ENGINEERING, CHEMICAL; Ethylene glycol; Field emission microscopy; Heating rate; Indium tin oxides; ITO; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; Microscopy; Microwave-assisted solvothermal; nanoparticles; optical properties; Scanning electron microscopy; Synthesis; Transmission electron microscopy; Visible spectrum; X-ray diffraction; optical properties; nanoparticles; ITO; Microwave-assisted solvothermal
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/1980-5373-mr-2017-0402

A systematic study about synthesis of In1-xSnx O2 (ITO) nanostructured crystals by microwaveassisted solvothermal method is reported. Different solutions using InCl3 .4H2 O and SnCl4 .5H2 O precursors in ethylene glycol solvent were prepared in distinct pHs (acid and basic ones). The syntheses were performed at 200 ºC using a heating rate of 50 ºC min-1 and soaking time of 30 minutes. 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 11.5 and 11.9 were further studied by field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) techniques. As ITO materials have many practical applications due to their transparency in the visible spectrum, UV-Vis spectroscopy analysis was performed to obtain the optical band gap and the respective optical window.