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Titanium Oxide Nanoparticles Precipitated from Low‐Temperature Aqueous Solutions: III. Thin Film Properties
Author(s) -
Roy Biplab Kumar,
Zhang Guangneng,
Cho Junghyun
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04827.x
Subject(s) - anatase , microstructure , materials science , supersaturation , precipitation , rutile , chemical engineering , nanoparticle , thin film , titanium , titanium oxide , aqueous solution , oxide , phase (matter) , dielectric , brookite , nanotechnology , mineralogy , metallurgy , photocatalysis , chemistry , biochemistry , physics , optoelectronics , organic chemistry , meteorology , engineering , catalysis
In our previous reports (Part I and II), we have identified precursor “supersaturation” as a key parameter to control the precipitation behavior of titania nanoparticles in a temperature‐driven hydrolysis process from the chemical bath of soluble titanium salt. Through this protocol, a methodology was developed to grow titania films with controlled microstructures and phases. In this study, we deposited titania films containing anatase or rutile as a dominant phase along with microstructures of various film densities, which were characterized for their dielectric, optical, photoelectrochemical, and mechanical properties. Specific microstructures and the constituting phases were responsible for a wide variation of such properties of titania thin films. This study aims to provide the systematic explanation for evolution of the phases as a function of the degree of supersaturation, along with the discussion of their effects on the aforementioned engineering properties.