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Preparation and Properties of Octadecahedral α‐Fe 2 O 3 Nanoparticles Enclosed by {104} and {112} Facets
Author(s) -
Liu Zhong,
Lv Baoliang,
Wu Dong,
Sun Yuhan,
Xu Yao
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201200140
Subject(s) - chemistry , formamide , nanoparticle , polyvinylpyrrolidone , coercivity , steric effects , adsorption , crystallography , nanotechnology , chemical engineering , stereochemistry , organic chemistry , condensed matter physics , materials science , physics , engineering
Abstract Octadecahedral α‐Fe 2 O 3 nanoparticles were hydrothermally synthesized in the presence of formamide. These octadecahedral α‐Fe 2 O 3 nanoparticles have a threefold axis and are enclosed by twelve dominant {112} facets and six {104} facets. In comparison with the {104} facets, the sterically less hindered {112} facets induced the selective adsorption of formamide more easily, which resulted in the gradual increase in the amount of {112} facets by decreasing the amount of {104} facets with increasing formamide. The coercivity ( H c ) of these octadecahedral particles increased successively as the aspect ratio ( c / a ) increased. The sensing capability of these particles toward H 2 O 2 was investigated, and the response currents of the particles dominated by {112} facets showed a linear relationship with a concentration of H 2 O 2 in the range from 40 μ M to 6.66 m M in different stages.