Hydrothermal synthesis of 3D TiO2 nanostructures using nitric acid: Characterization and evolution mechanism


Erdogan N., ÖZTÜRK A. , PARK J.

CERAMICS INTERNATIONAL, vol.42, no.5, pp.5985-5994, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 5
  • Publication Date: 2016
  • Doi Number: 10.1016/j.ceramint.2015.12.148
  • Title of Journal : CERAMICS INTERNATIONAL
  • Page Numbers: pp.5985-5994
  • Keywords: TiO2, Hydrothermal process, Crystal growth, Nanostructured materials, Nitric acid, ANATASE TIO2, RUTILE TIO2, PHASE, NANOPARTICLES, PERFORMANCE, MORPHOLOGY, PARTICLES, NANORODS, POWDERS, GROWTH

Abstract

Various morphologies of TiO2 nanostructures were synthesized by HNO3 assisted hydrothermal treatment with respect to the acid molarity (1 M, 3 M, and 8 M), temperature (110, 140, and 180 degrees C), and time (1, 3, and 6 h). An additional sample was synthesized inside the protonated titanate nanoribbon coated vessel with the acid molarity of 8M at 140 degrees C for 3 h. The crystal structure and morphology of the nanostructures synthesized were investigated using X-Ray diffractometer, scanning electron microscope, and transmission electron microscope. The results revealed that lower acid concentrations, longer synthesis durations and higher temperatures favored anatase phase formation. Meanwhile, a phase pure 3D lotus structure ruffle TiO2 could be obtained by hydrothermal synthesis at 8M HNO3 concentration at 140 degrees C for 3 h using protonated Htitanate nanoribbons. A probable mechanism for the evolution of 3D ruffle lotus structure was highlighted. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.