Abstract
α-Fe2O3 nanocrystalline was encapsulated by block copolymer, hydroxylated poly(styrene-b-butadiene-b-styrene) (HO-SBS), and formed α-Fe2O3/HO-SBS heterostructure composite consisting of nanocrystalline core and copolymer shell. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) are used to investigate the structure of the composite. And the results show that α-Fe2O3 core is 45nm in diameter and copolymer shell is 10nm. Cyclic voltammetry demonstrated copolymer shells can act as potential barriers, while electric field introduced surface photovoltage spectroscopy (EFISPS) testifies that charges can be introduced to penetrate through the shell under external electronic field.
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