Phase transition in CdSe quantum dots and deposition of cdse quantum dots on graphene sheets

Kanodarwala, FK; Stride, JA

Phase transition in CdSe quantum dots and deposition of cdse quantum dots on graphene sheets

Kanodarwala, FK Stride, JA

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Publication Type:: Chapter
Citation:: Nanomaterials: Science and Applications, 2016, pp. 203-230
Issue Date:: 2016-01-22

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Field	Value	Language
dc.contributor.author	Kanodarwala, FK
dc.contributor.author	Stride, JA
dc.date.accessioned	2022-11-13T04:32:35Z
dc.date.available	2022-11-13T04:32:35Z
dc.date.issued	2016-01-22
dc.identifier.citation	Nanomaterials: Science and Applications, 2016, pp. 203-230
dc.identifier.isbn	9789814669726
dc.identifier.uri	http://hdl.handle.net/10453/163411
dc.description.abstract	To date, quantum dots (QDs) have been synthesized through a number of different processes ranging from colloidal synthesis and electrochemical methods to chemical vapor deposition (CVD). This chapter focuses on the synthesis of high-quality CdSe nanocrystals through a bench-top colloidal synthesis, paying particular attention to the effects on the size and crystallinity of the QDs of varying the reaction temperature and reagent concentrations. Powder X-ray diffraction (PXRD) analysis and high-resolution transmission electron microscopy (HRTEM) have been used to highlight a transition of the crystallite phases obtained, from cubic zinc blende to hexagonal wurtzite and back again to the cubic phase as a function of reaction time. The nature of this phase shift is believed to be due to the rapid growth along the (111) crystallite facets, with the facial facets then "catching up," to restore the cubic symmetry. High-quality trioctylphosphine/trioctylphosphine oxide (TOP/ TOPO)-capped CdSe QDs displaying a narrow emission band were then grafted onto graphene nanosheets through a simple wetchemical procedure. A significant red shift of both the broad absorption and the narrow emission spectrum of the QDs was observed upon attachment to graphene, as determined by UV-Vis absorption and photoluminescence spectroscopies, whilst HRTEM data clearly show the successful decoration of the graphene sheets with CdSe QDs. This type of nanocomposite may have potential applications in the fields of optics, biological imaging, and sensing.
dc.language	en
dc.relation.ispartof	Nanomaterials: Science and Applications
dc.relation.isbasedon	10.4032/9789814669733
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Phase transition in CdSe quantum dots and deposition of cdse quantum dots on graphene sheets
dc.type	Chapter
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - CFS - Centre for Forensic Science
utslib.copyright.status	closed_access	*
dc.date.updated	2022-11-13T04:32:33Z
pubs.publication-status	Published

Abstract:

To date, quantum dots (QDs) have been synthesized through a number of different processes ranging from colloidal synthesis and electrochemical methods to chemical vapor deposition (CVD). This chapter focuses on the synthesis of high-quality CdSe nanocrystals through a bench-top colloidal synthesis, paying particular attention to the effects on the size and crystallinity of the QDs of varying the reaction temperature and reagent concentrations. Powder X-ray diffraction (PXRD) analysis and high-resolution transmission electron microscopy (HRTEM) have been used to highlight a transition of the crystallite phases obtained, from cubic zinc blende to hexagonal wurtzite and back again to the cubic phase as a function of reaction time. The nature of this phase shift is believed to be due to the rapid growth along the (111) crystallite facets, with the facial facets then "catching up," to restore the cubic symmetry. High-quality trioctylphosphine/trioctylphosphine oxide (TOP/ TOPO)-capped CdSe QDs displaying a narrow emission band were then grafted onto graphene nanosheets through a simple wetchemical procedure. A significant red shift of both the broad absorption and the narrow emission spectrum of the QDs was observed upon attachment to graphene, as determined by UV-Vis absorption and photoluminescence spectroscopies, whilst HRTEM data clearly show the successful decoration of the graphene sheets with CdSe QDs. This type of nanocomposite may have potential applications in the fields of optics, biological imaging, and sensing.

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http://hdl.handle.net/10453/163411