Authors: Margarita Baitimirova Jana Andzane Gvido Petersons Raimonds Meija Raimonds Poplausks Marina Romanova Donats Erts
Publish Date: 2016/06/01
Volume: 51, Issue: 17, Pages: 8224-8232
Abstract
In this work stoichiometric separate bismuth selenide Bi2Se3 nanoplates and continuous Bi2Se3 coatings are synthesized on graphene substrate by catalystfree vapor–solid deposition method The orientation of synthesized nanoplates relative to the substrate surface varies from heteroepitaxial planar to oriented under different angles nonplanar The nonplanar growth of the nanoplates was achieved for the first time by shortterm carrier inert gas flow in certain temperature interval of the synthesis process The crystallographic growth directions of nonplanar nanoplates were determined from HRTEM images as well as estimated from the slope angles of nonplanar nanoplates Bi2Se3 coatings consisting of combination of planar and nonplanar nanoplates exhibit significantly enhanced in comparison with coating consisting of only planar coalescent Bi2Se3 nanoplates thermoelectric properties Demonstrated graphene/Bi2Se3/graphene devices may find applications in thermoelectric and photodetection sensors
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