In:
Applied Spectroscopy, SAGE Publications, Vol. 58, No. 5 ( 2004-05), p. 598-602
Abstract:
To investigate the relationship between the size and structure of TiO 2 nanoparticles, three size-selected samples of TiO 2 nanoparticles were prepared via a hydrolysis method that uses Ti[OCH(CH 3 ) 2 ] 4 as the starting material. The structures of the nanoparticles were characterized using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray absorption spectroscopy (XAS). Analysis of the XRD patterns and of the TEM images showed that the samples were dispersed, with an average particle size of ∼30 nm (sample A), ∼12 nm (sample B), and ∼7 nm (sample C). Their X-ray absorption spectra indicate that samples A and B have an anatase structure, whereas sample C has a structure very similar to that of the TiO 2 II phase, which generally arises only under high-pressure conditions. This difference can be attributed to size-induced radial pressure within the smaller nanoparticles, which plays an important role in the phase of TiO 2 nanoparticles in sample C.
Type of Medium:
Online Resource
ISSN:
0003-7028
,
1943-3530
DOI:
10.1366/000370204774103435
Language:
English
Publisher:
SAGE Publications
Publication Date:
2004
detail.hit.zdb_id:
1474251-2
SSG:
11
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