Phonon Confinement Model to Measure the Average Sizes of Anatase Nanoparticles Synthesized by a Solvothermal Method Using H2O2

Journal of the Brazilian Chemical Society Volume: 24 Issue: 6 Pages: 1057-U993 Published: 2013

TEM image of TiO2 nanocrystals obtained by solvothermal method at 100 °C and 72h of reaction. The inset shows the size dispersion curve.

Writers: Bartolomeu C. Viana; Juliana Sousa Gonçalves; Valdemir dos Santos; Maria Rita de M. C. Santos; Elson Longo; Francisco E. P. Santos; and José Milton Elias de Matos

Keywords: anatase; nanoparticles; solvothermal method; H2O2; Raman spectroscopy.

Abstract: In this work, crystalline titanium dioxide (TiO2) nanoparticles with variable average crystallite sizes (e.g., 8 nm) and surface areas (e.g., 192 m2 g−1) were synthesized in pure anatase phase using H2O2 to reduce the hydrolysis rate of the titanium ions. An isopropanol (IP) solution was employed as the reaction medium. The TiO2 nanoparticles were characterized by powder X-ray diffraction analysis (XRD), Raman spectroscopy and transmission electron microscopy (TEM). By changing the synthesis parameters it was possible to control nanoparticle size and avoid the coalescence process. A dependence of the Raman wavenumber on the nanocrystal sizes was determined, which is quite useful for a quick check of the size of TiO2 nanocrystals.

See PDF: Phonon Confinement Model to Measure the Average Sizes of Anatase Nanoparticles Synthesized by a Solvothermal Method Using H2O2

DOI: 10.5935/0103-5053.20130136

Sobre CDMF 591 Artigos
O CDMF é um dos Centros de Pesquisa, Inovação e Difusão (CEPID) apoiados pela FAPESP. O Centro também recebe investimento do CNPq, a partir do Instituto Nacional de Ciência e Tecnologia dos Materiais em Nanotecnologia (INCTMN).