CdS crown growth on CdSe nanoplatelets: core shape matters

Autor: Anja Schlosser, Rebecca T. Graf, Nadja C. Bigall
Rok vydání: 2020
Předmět:
PL quantum yield
Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
Photoluminescence
Pl spectroscopy
Materials science
Chalcogenide
Growth kinetics
High resolution transmission electron microscopy
Bioengineering
02 engineering and technology
Cadmium sulfide
010402 general chemistry
01 natural sciences
Selenium compounds
chemistry.chemical_compound
Lateral extension
Particle domains
General Materials Science
Cadmium chalcogenides
Lighting applications
Optical properties
business.industry
General Engineering
Optical features
II-VI semiconductors
General Chemistry
Optimised conditions
021001 nanoscience & nanotechnology
Atomic and Molecular Physics
and Optics
0104 chemical sciences
Core (optical fiber)
chemistry
Transmission electron microscopy
Electronic properties
ddc:540
Optoelectronics
Particle
Optical emitter
0210 nano-technology
business
Zdroj: Nanoscale Advances 2 (2020), Nr. 10
Nanoscale Advances
ISSN: 2516-0230
Popis: Cadmium chalcogenide nanoplatelets (NPLs) have gained tremendous attention in the past decade due to their extremely narrow optical features and their special electronic properties. For the application of the NPLs as optical emitters, in (photo) catalysis or sensing, further modification of the pristine (core) NPLs can be required. Therefore, many procedures for the synthesis of crowns (lateral extension of the core NPLs), shells and particle domains on the NPLs have already been developed. CdSe/CdS core/crown NPLs are characterised by extremely short photoluminescence (PL) lifetimes and high PL quantum yields (PLQYs) and might therefore be ideal candidates for lighting applications. In this work, we show how the optical properties of CdSe/CdS core/crown NPLs, especially their PLQYs, can be strongly improved by applying a sulphur precursor with a low reactivity. Under optimised conditions, the new procedure allows the growth of uniform CdS crowns around CdSe core NPLs with various lateral sizes, thicknesses and shapes. In addition, the modified growth kinetics was investigated by various methods, including UV/vis and PL spectroscopy as well as transmission electron microscopy. This journal is © The Royal Society of Chemistry.
Databáze: OpenAIRE
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