单晶α-三氧化二铁纳米结构：可控合成及可见光下高指数面增强的光降解性能.doc


Single-crystalline α-Fe2O3 nanostructures: controlled
synthesis and high-index planes-enhanced photodegradation
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by visible light#
WU Wei1,2, HAO Rui1, LIU Fei1, SU Xintai2, HOU Yanglong1**
(1. Department of Materials Science and Engineering, College of Engineering, Peking University,
Beijing 100871;
2. Ministry Key Laboratory of Oil and Gas Fine Chemicals, College of Chemistry and Chemical
Engineering, Xinjiang University, Urumqi 830046)
Abstract: In this work, α-Fe2O3 oblique and truncated nanocubes were synthesized in the presence
of oleylamine (OAm), acetylacetone (Hacac) and oleic acid (OA) through a facile one-step
solvothermal method. The phase of iron oxide was precisely regulated through the volume ratio of
OAm/Hacac, and confirmed by X-ray diffraction (XRD) and Raman imaging microscope system. The
formation mechanism of α-Fe2O3 nanocrystals was discussed systematically and a schematic
illustration for the probable formation of the morphologies in whole of the synthetic process was also
proposed. Furthermore, the truncated nanocubes exposing both the {012} and {104} dominant planes
exhibit higher photocatalytic activity toward pared with the oblique nanocubes surrounded by
only {012} dominant facet, which reveals the high photocatalytic activity is attributed to the exposure
of {104} high-index planes. The truncated nanocubes with highly catalytic activity may potentially
serve as effective and cheap catalysts for photodegradation.
Key words: α-Fe2O3, Synthesis, photodegradation
0 Introduction
The physical and chemical properties of the micro/nanomaterials are dependent not only on
their sizes but also strongly on their crystal shapes. The size determines the ratio of surface
atoms, and the morphology of crystals is closely related to the exposed crystal faces of the
particle.[1-4] The morphology-controlled synthesis of nanocrystals has attracted intensive
attention in recent years, and a significant am