Vapor–solid synthesis and enhanced thermoelectric properties of non-planar bismuth selenide nanoplates on graphene substrate

Margarita Baitimirova, Jana Andzane, Gvido Petersons, Raimonds Meija, Raimonds Poplausks, Marina Romanova, Donats Erts

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this work, stoichiometric separate bismuth selenide (Bi2Se3) nanoplates and continuous Bi2Se3 coatings are synthesized on graphene substrate by catalyst-free vapor–solid deposition method. The orientation of synthesized nanoplates relative to the substrate surface varies from heteroepitaxial (planar) to oriented under different angles (non-planar). The non-planar growth of the nanoplates was achieved for the first time by short-term carrier inert gas flow in certain temperature interval of the synthesis process. The crystallographic growth directions of non-planar nanoplates were determined from HRTEM images as well as estimated from the slope angles of non-planar nanoplates. Bi2Se3 coatings consisting of combination of planar and non-planar 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 photo-detection sensors.

Original languageEnglish
Pages (from-to)8224-8232
Number of pages9
JournalJournal of Materials Science
Volume51
Issue number17
DOIs
Publication statusPublished - 1 Sep 2016
Externally publishedYes

Field of Science*

  • 2.3 Mechanical engineering
  • 2.5 Materials engineering

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database

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