Synthesis of gold-cadmium selenide co-colloids

1998 ◽  
Vol 13 (4) ◽  
pp. 905-908 ◽  
Author(s):  
Rekha Nayak ◽  
Jane Galsworthy ◽  
Peter Dobson ◽  
John Hutchison
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Optical Absorption ◽  
Cadmium Selenide ◽  
Size Range ◽  
Core Shell ◽  
Optical Absorption Spectra ◽  
Transmission Electron ◽  
Core Shell Structure

Semiconductor-metal co-colloids of CdSey/Au have been prepared by various synthetic pathways. Their microstructure, including that of Au–CdSe(TOPO) co-colloid in a core-shell structure, has been examined by high resolution transmission electron microscopy (HRTEM) and found to be well defined within the 10 nm size range. The optical absorption spectra of the colloids and of various synthesis stages have been obtained.

Preparation of GDC Nanopowders and GDC/YSZ Core-Shell Nanocomposites

2010 ◽  
Vol 434-435 ◽  
pp. 717-718
Author(s):  
Zuo Cai Huang ◽  
Bin Li ◽  
Wei Liu ◽  
Wei Pan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Sol Gel ◽  
Precipitation Method ◽  
Core Shell ◽  
The Core ◽  
Transmission Electron ◽  
Core Shell Structure ◽  
Co Precipitation

Nanocrystalline GDC as small as 5 nm was successfully synthesized via the co-precipitation method. GDC/YSZ core-shell nanocrystals, which were GDC nanocrystals overcoated by a thin YSZ layer, was successfully synthesized by the addition of GDC nanocrystals in the YSZ source solution using sol-gel method. The core-shell structure was supported by its high-resolution transmission electron microscopy results and the composition was investigated by EDX method.

Enhancement of durability of NIR emission of Ag2S@ZnS QDs in water

2017 ◽  
Vol 31 (32) ◽  
pp. 1750297 ◽  
Author(s):  
M. Karimipour ◽  
M. Bagheri ◽  
M. Molaei
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Xrd Analysis ◽  
Core Shell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Nir Emission ◽  
Core Shell Structure ◽  
Phase Transmission

Stability of Ag2S@ZnS QDs in water is a crucial concern for their application in biology. In this work, both physical sustainability and emission stability of Ag2S QDs were enhanced using parameter optimization of a pulsed microwave irradiation (MI) method up to 105 days after their preparation. UV–Vis and photoluminescence spectroscopies depicted an absorption and emission about 817 nm and 878 nm, respectively. X-ray diffraction (XRD) analysis showed a growth of Ag2S acanthite phase. Transmission Electron Microscopy (TEM) images revealed a clear formation of Ag2S@ZnS core–shell structure.

scholarly journals Synthesis of cubic CdSe nanocrystals and their spectral properties

2017 ◽  
Vol 7 ◽  
pp. 184798041770174 ◽  
Author(s):  
Yukun Gao ◽  
PG Yin
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Cadmium Selenide ◽  
Surface Effect ◽  
Peak Shift ◽  
Raman Peak ◽  
Cdse Nanocrystals ◽  
Transmission Electron ◽  
Raman Peak Shift

The cadmium selenide nanocrystals are prepared by colloidal chemistry under mild conditions. X-ray diffraction and high-resolution transmission electron microscopy measurements indicate that as-prepared cadmium selenide nanocrystals are zinc blende cubic structure. We carry out an analysis of quantum size effect in the Raman spectra of cadmium selenide nanocrystals performed by utilizing the chemical bond theory of Raman peak shift developed recently. It is revealed that the shifts of Raman peaks in cadmium selenide nanocrystals result from the overlapping of the quantum effect shifts and surface effect shifts. The sizes of the as-prepared cadmium selenide nanocrystals obtained by employing the Raman peak shift theory are in good agreement with the nanocrystal sizes determined by high-resolution transmission electron microscopy.

Transmission electron microscopy on Zr- and Hf-borides with MoSi2 addition: Densification mechanisms

2010 ◽  
Vol 25 (5) ◽  
pp. 828-834 ◽  
Author(s):  
Laura Silvestroni ◽  
Hans-Joachim Kleebe ◽  
Stefan Lauterbach ◽  
Mathis Müller ◽  
Diletta Sciti
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Temperature ◽  
Liquid Phase ◽  
Core Shell ◽  
Electron Microscopies ◽  
Partial Wetting ◽  
Transmission Electron ◽  
The Matrix ◽  
Core Shell Structure

The microstructures of two pressureless sintered ceramics, ZrB2 and HfB2 with 20 vol% MoSi2 added, were analyzed by scanning and transmission electron microscopies. Carbides and oxides of the transition metals and MoB were observed to be well dispersed within the boride matrix. Mo5Si3 and Mo5SiB2, with Zr or Hf impurities, were observed at triple grain junctions and showed a partial wetting of the matrix. It was also noticed that the borides had a core-shell structure, which was especially pronounced in the ZrB2-based composite. The experimental results suggest the formation of a Mo–Si–B liquid phase at high temperature, which strongly promoted the densification. The densification mechanisms are discussed in light of the microstructure evolution on sintering, thermodynamic considerations, and the phase diagrams of the species involved.

Visualizing a core–shell structure of heavily doped silicon quantum dots by electron microscopy using an atomically thin support film

Nanoscale ◽  
2018 ◽  
Vol 10 (16) ◽  
pp. 7357-7362 ◽  
Author(s):  
Hiroshi Sugimoto ◽  
Masataka Yamamura ◽  
Makoto Sakiyama ◽  
Minoru Fujii
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Shell Structure ◽  
Core Shell ◽  
Oxide Support ◽  
Si Quantum Dot ◽  
Transmission Electron ◽  
Doped Silicon ◽  
Heavily Doped ◽  
Core Shell Structure

We successfully visualize a core–shell structure of a heavily B and P codoped Si quantum dot (QD) by transmission electron microscopy using an ultra-thin graphene oxide support film.

scholarly journals On the passivation of iron particles at the nanoscale

2019 ◽  
Vol 1 (6) ◽  
pp. 2276-2283 ◽  
Author(s):  
Maximilian Lasserus ◽  
Daniel Knez ◽  
Martin Schnedlitz ◽  
Andreas W. Hauser ◽  
Ferdinand Hofer ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Scanning Transmission Electron Microscopy ◽  
Core Shell ◽  
Iron Particles ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission

The oxidation of Fe@Au core@shell clusters with sizes below 5 nm is studied via high resolution scanning transmission electron microscopy.

Transmission Electron Microscopy Study of Gold-Coated Iron Core-Shell and Au/Fe/Au Onion-Like Nanoparticles Synthesized using Reverse Micelles

1999 ◽  
Vol 581 ◽  
Author(s):  
W.L. Zhou ◽  
E.E. Carpenter ◽  
J. Sims ◽  
A. Kumbhar ◽  
C.J. O'Connor
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Shell Structure ◽  
Reverse Micelles ◽  
Iron Core ◽  
Core Shell ◽  
Gold Shell ◽  
The Core ◽  
Transmission Electron ◽  
Core Shell Structure

ABSTRACTGold-coated iron core-shell structure and Au/Fe/Au onion-like nanoparticles synthesized using reverse micelles were characterized by transmission electron microscopy (TEM). The average nanoparticle size of the core-shell structure is about 8 nm, with about 6 nm diameter core and 2 nm shell. The gold shell structure can be resolved from both high resolution electron microscopy (HREM) image and energy dispersive X-ray spectrum (EDS). Even though the gold and iron electron diffraction rings overlap a little bit, they can still be identified due to the slight mismatch of the diffraction rings. The Au/Fe/Au onion-like nanoparticles were also observed. The nanoparticles were formed with about 6 nm diameter gold core, 1 nm iron interlayer and 2 nm gold shell. The shell structure coated on the core appeared unhomogeneous, however, in both cases the iron core and interlayer iron shell stay air-stable.

scholarly journals Crystallization of BaF2 from droplets of phase separated glass – evidence of a core–shell structure by ASAXS

CrystEngComm ◽  
2020 ◽  
Vol 22 (30) ◽  
pp. 5031-5039
Author(s):  
Armin Hoell ◽  
Vikram Singh Raghuwanshi ◽  
Christian Bocker ◽  
Andreas Herrmann ◽  
Christian Rüssel ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Small Angle ◽  
Shell Structure ◽  
Core Shell ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Core Shell Structure

Glasses with the mol% compositions 1.88 Na2O·15.04 K2O·7.52 Al2O3·69.56 SiO2·6.00 BaF2 and 1.88 Na2O·15.03 K2O·7.52 Al2O3·69.52 SiO2·6.00 BaF2·0.05 SmF3 were studied using X-ray diffraction, transmission electron microscopy, and anomalous small-angle X-ray scattering.

scholarly journals Thermally induced alloying processes in a bimetallic system at the nanoscale: AgAu sub-5 nm core–shell particles studied at atomic resolution

Nanoscale ◽  
2018 ◽  
Vol 10 (4) ◽  
pp. 2017-2024 ◽  
Author(s):  
Maximilian Lasserus ◽  
Martin Schnedlitz ◽  
Daniel Knez ◽  
Roman Messner ◽  
Alexander Schiffmann ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Atomic Resolution ◽  
Core Shell ◽  
Thermally Induced ◽  
Transmission Electron ◽  
Bimetallic System ◽  
Shell Particles

Alloying processes in nanometre-size Ag@Au and Au@Ag core@shell particles are studied via high resolution Transmission Electron Microscopy (TEM) imaging.

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