Slow colloidal growth of PbSe nanocrystals for facile morphology control = PbSe 나노입자의 간단한 모폴로지 제어를 위한 느린 입자성장 방법

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We report growth of colloidal PbSe nanosheets via simple control of reaction para-meters. The approach involves slow injection of precursors with excess amounts of oleic acid. Retarded growth, due to both the slow supply of precursors and the surfeit of oleic acid, causes attachment of PbSe nanocrystals (NCs) through most reactive {110} planes into two-dimensional geometry. On the other hand, such attachment processes can be pre-vented by impurities, e.g., Cd chalcogenide (CdSe or CdS) NCs dispersed in chloroform. For instance, the slow injection of Pb and Se precursors into a reaction solution containing Cd chalcogenide NCs results in the growth of spherical PbSe NCs, as the Cd chalcogenide NCs hinder the PbSe nuclei from merging via {110} planes. Compared to conventional rapid-injection methods, PbSe NCs grow very slowly, which enables fine control of NC size. Cd chalcogenide clusters bound on the surface of PbSe NCs are responsible for both impeding nanosheet formation and slowing PbSe NC growth.
Advisors
Lee, Doh-Changresearcher이도창
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2013
Identifier
566474/325007  / 020114520
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2013.8, [ vi, 52 p. ]

Keywords

PbSe nanosheets; 저속 주입; 모폴로지 제어; 나노입자 성장 속도; PbSe 나노시트; slow injection; nanoparticle growth rate; morphology control

URI
http://hdl.handle.net/10203/196247
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=566474&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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