Large-area two-dimensional bismuth selenide crystals synthesized by solution-based control of the nucleation environment. Issue 108 (9th November 2016)

• Record Type: Journal Article
• Authors: Pradhan, Mukul; Song, Intek; Lee, Jinho; Lee, Minkyung; Park, Chibeom; Choi, Hee Cheul
• Is Part Of: RSC advances. Volume 6:Issue 108(2016)
• Page Start: 106960
• Page End: 106963
• Publication Date: 2016-11-09
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra23982j
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Large-area 2D Bi2 Se3 crystals are grown by solution-based synthesis, where both seed-mediated growth and chelating agents are used. Abstract : Two-dimensional (2D) Bi2 Se3 is one of the most studied nanomaterials in recent years because of its fascinating electronic properties. However, previous synthesis methods, especially solution-based methods, were not capable of growing laterally large 2D Bi2 Se3 crystals (mostly up to a few micrometers), and thus its real application and in-depth study was practically impossible. In this communication, we report a simple, reliable two-step method to synthesize large (20–50 μm in the lateral diameter and 10–15 nm in the thickness) disks of Bi2 Se3 in the presence of ethylenediamine-tetraacetic acid (EDTA) and chloride ion, where EDTA acts as a complexing agent with bismuth(iii ). Depending on the growth conditions, we obtained 2D Bi2 Se3 crystals having either a flat or spiral surface. We have thoroughly characterized the morphology, crystal structures, and electrical properties of these new disks, and we also discussed a possible growth mechanism based on the control over the surface chemistry and the nucleation stage.