Thermokinetic study on growth process of CdS nanocrystals by in situ microcalorimetry

2011 ◽  
Vol 65 (12) ◽  
pp. 1768-1771 ◽  
Author(s):  
Jie Chen ◽  
Yujie Ma ◽  
Gaochao Fan ◽  
Yanfen Li ◽  
Junying Jiang ◽  
...  
Keyword(s):  
Growth Process ◽  
Cds Nanocrystals ◽  
In Situ Microcalorimetry

scholarly journals Time and Temperature Dependence of CdS Nanoparticles Grown in a Polystyrene Matrix

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
F. Antolini ◽  
E. Burresi ◽  
L. Stroea ◽  
V. Morandi ◽  
L. Ortolani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Growth Process ◽  
General Trend ◽  
Cds Nanoparticles ◽  
Size Dependent ◽  
Cds Nanocrystals ◽  
Polystyrene Matrix ◽  
Morphology And Structure ◽  
Cds Qds

Luminescent CdS nanocrystals embedded in a polystyrene matrix were successfully prepared. Thein situgrowth of CdS QDs was realized by thermal treatment of Cd bis(thiolate)/polymer foil at different times and temperatures (240°Cand300°C) of annealing, in order to evaluate their influence on the quantum dots growth process. As a general trend, the increasing of time and temperature of annealing induces a rise of the CdS nanocrystals size into the polymeric matrix. The size distribution, morphology, and structure of the CdS nanoparticles were analysed with HRTEM and XRD experiments. UV-Vis and PL data are strongly size-dependent and were used to investigate the particles' growth process, too. The CdS nanoparticles behavior in solution indicated a general trend of QDs to aggregation. This predisposition was clearly displayed by DLS measurements.

Photoluminescence Enhancement of CdS Nanocrystals Fabricated on Dithiocarbamate Functionalized PET Substrates

2012 ◽  
Vol 512-515 ◽  
pp. 1511-1515
Author(s):  
Chun Lin Zhao ◽  
Li Xing ◽  
Xiao Hong Liang ◽  
Jun Hui Xiang ◽  
Fu Shi Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Hexagonal Structure ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Cds Nanocrystals ◽  
Morphological Studies ◽  
Transmission Electron

Cadmium sulfide (CdS) nanocrystals (NCs) were self-assembled and in-situ immobilized on the dithiocarbamate (DTCs)-functionalized polyethylene glycol terephthalate (PET) substrates between the organic (carbon disulfide diffused in n-hexane) –aqueous (ethylenediamine and Cd2+ dissolved in water) interface at room temperature. Powder X-ray diffraction measurement revealed the hexagonal structure of CdS nanocrystals. Morphological studies performed by scanning electron microscopy (SEM) and high-resolution transmission electron microscope (HRTEM) showed the island-like structure of CdS nanocrystals on PET substrates, as well as energy-dispersive X-ray spectroscopy (EDS) confirmed the stoichiometries of CdS nanocrystals. The optical properties of DTCs modified CdS nanocrystals were thoroughly investigated by ultraviolet-visible absorption spectroscopy (UV-vis) and fluorescence spectroscopy. The as-prepared DTCs present intrinsic hydrophobicity and strong affinity for CdS nanocrystals.

scholarly journals Synthesis of CdS nanocrystals in polymeric films studied by in-situ GID and GISAXS

2015 ◽  
Vol 1810 ◽  
Author(s):  
Tiziana Di Luccio ◽  
Dina Carbone ◽  
Silvia Masala ◽  
Karthik Ramachandran ◽  
Julie Kornfield
Keyword(s):  
Hexagonal Lattice ◽  
Grazing Incidence ◽  
Lattice Parameter ◽  
Polymeric Films ◽  
Diffraction Intensity ◽  
Cds Nanocrystals ◽  
Grazing Incidence Diffraction ◽  
Angle Scattering ◽  
Precursor Structure

ABSTRACTIn this work, we describe the synthesis of CdS nanocrystals in thin polymeric films by in-situ Grazing Incidence Diffraction (GID) and Grazing Incidence Small Angle Scattering (GISAXS). The 2D GISAXS patterns indicate how the precursor structure is altered as the temperature is varied from 25°C to 300°C. At 150°C, the CdS nanocrystals start to arrange themselves in a hexagonal lattice with a lattice parameter of 27 Å. The diffraction intensity from the hexagonal lattice reaches a maximum at 170°C and decreases steadily upon further heating above 220°C indicating loss of symmetry. Correspondingly, the GID scans at 170°C show strong crystalline peaks from cubic CdS nanocrystals that are about 2 nm size. The results indicate that a temperature of 170°C is sufficient to synthesize CdS nanocrystals without degradation of the polymer matrix (Topas) in thin films (about 30nm).

scholarly journals In situ XPS analysis of the atomic layer deposition of aluminium oxide on titanium dioxide

2019 ◽  
Vol 21 (3) ◽  
pp. 1393-1398 ◽  
Author(s):  
Robert H. Temperton ◽  
Andrew Gibson ◽  
James N. O'Shea
Keyword(s):  
Titanium Dioxide ◽  
Atomic Layer Deposition ◽  
Growth Process ◽  
Aluminium Oxide ◽  
Atomic Layer ◽  
Xps Analysis ◽  
Layer Deposition ◽  
Titanium Dioxide Surface ◽  
Rutile Titanium Dioxide

Ultra-thin aluminium oxide was grown on a rutile titanium dioxide surface by atomic layer deposition using trimethylaluminium and water precursors. XPS measurements were made during the growth process at near-ambient pressures.

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