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Controlled Synthesis of Bi2Te3 and Bi2Se3 Nanoplates via a Solvothermal Process.

Title
Controlled Synthesis of Bi2Te3 and Bi2Se3 Nanoplates via a Solvothermal Process.
Translated Title
용매열합성 방법을 통한 Bi 2Te 3 와 Bi 2Se 3 나노 판의 합성 제어
Authors
Kang, Sung Min
DGIST Authors
Kang, Sung Min; Hong, Jung Il; Lee, Soo Keun
Advisor(s)
Hong, Jung Il
Co-Advisor(s)
Lee, Soo Keun
Issue Date
2015
Degree Date
2015. 8
Type
Thesis
Access Rights
The original item will not be provided upon request from the author
Keywords
Bismuth tellurideBismuth selenideSolvothermal synthesisNanoplatesCrystal growth비스무스 비스무스 텔루라이드 텔루라이드비스무스 비스무스 셀레나이드 셀레나이드용매열합성 용매열합성나노판 나노판결정 성장
Abstract
Hexagonal Bi based chalcogenide nanoplates (Bi2Te3 and Bi2Se3) were synthesized via a solvothermal process. The morphology, size, and composition of the synthetic products have been characterized by X-ray diffraction, scanning electron microscope, high-resolution transmission electron microscope, and selected area electron diffraction. In this solvothermal process, the reaction temperature played important roles for the formation of Bi based chalcogenide nanocrystals. Alkaline additive, NaOH was added to form the Bi based chalcogenide single nanocrystals and control the thickness of nanoplates. However, the results showed that NaOH have an effect on the morphology and size of Bi based chalcogenide nanoplates. Polyvinylpyrrolidone (PVP) was also used to obtain the Bi based chalcogenide nanoplates. It was confirmed that PVP concentration can adjust the thickness of the synthesized Bi2Te3 nanoplates. This work may suggest the method about controlling the shapes of Bi2Te3 and Bi2Se3 nanocrystals. ⓒ 2015 DGIST
Table Of Contents
I. INTRODUCTION 1 -- 1.1 Motivation 1 -- 1.2 Various Synthesis Method 2 -- 1.2.1 Physical & Dry Synthesis 2 -- 1.2.2 Chemical & Wet Synthesis 5 -- II. EXPERIMENTAL DETAILS 8 -- 2.1 Experimental Materials 8 -- 2.2 Solvothermal Synthesis 8 -- 2.3 Characterizations 10 -- 2.3.1 X-Ray Diffraction (XRD) 10 -- 2.3.2 Field Emission Scanning Electron Microscopy (FE-SEM) 10 -- 2.3.3 High Resolution Transmission Electron Microscopy (HR-TEM) 11 -- III. RESULTS AND DISCUSSION 12 -- 3.1 Structure and Morphology Characterization 12 -- 3.2 Influences of Reaction Parameters. 17 -- 3.2.1 Temperature 17 -- 3.2.2 NaOH Addition 21 -- 3.2.3 PVP Concentration 23 -- IV. CONCLUSION 30 -- References 31
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002066927
http://hdl.handle.net/20.500.11750/1405
DOI
10.22677/thesis.2066927
Degree
Master
Department
Emerging materials Science
University
DGIST
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceThesesMaster


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