Type-II GaSb/GaAs Nanostructures Grown by Droplet Epitaxy with Various Ga Amounts

2015 ◽  
Vol 1131 ◽  
pp. 60-63 ◽  
Author(s):  
Maetee Kunrugsa ◽  
Somsak Panyakeow ◽  
Somchai Ratanathammaphan
Keyword(s):  
Quantum Dots ◽  
Atomic Force Microscopy ◽  
Optical Properties ◽  
Droplet Epitaxy ◽  
Formation Mechanisms ◽  
Type Ii ◽  
Quantum Rings ◽  
Force Microscopy ◽  
Atomic Force

We study the GaSb/GaAs nanostructures (NSs) grown by droplet epitaxy technique with various Ga amounts. Ga amount deposited on the GaAs (001) substrate was varied between 3-5 ML to form the different size and density of liquid Ga droplets. The Sb flux was subsequently irradiated to crystallize the droplets. Morphology of GaSb NSs was investigated by atomic force microscopy (AFM). Quantum rings were obtained after crystallizing 3-ML Ga droplets, whereas some kind of quantum dots were formed after crystallizing 4-and 5-ML Ga droplets. The formation mechanisms leading to the different structure are discussed. The photoluminescence (PL) measurement was performed to examine the optical properties of GaSb/GaAs NSs.

Kinetics of the evolution of InAs/GaAs quantum dots to quantum rings: A combined x-ray, atomic force microscopy, and photoluminescence study

2009 ◽  
Vol 80 (15) ◽  
Author(s):  
Vikas Baranwal ◽  
Giorgio Biasiol ◽  
Stefan Heun ◽  
Andrea Locatelli ◽  
Tevfik Onur Mentes ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Force Microscopy ◽  
Quantum Rings ◽  
Photoluminescence Study ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Kinetics Of

Rod- and sphere-shaped cellulose nanocrystals (CNCs) type-II derived from Asclepias Syriaca stem residues: Composition, Morphology and Thermal properties.

2020 ◽  
Author(s):  
Jérémy Astruc ◽  
Michel Grandbois ◽  
Gaétan Laroche ◽  
Mathieu Robert ◽  
Said Elkoun
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Cellulose Nanocrystals ◽  
Cellulose Content ◽  
Cellulose Ii ◽  
Type Ii ◽  
Cellulose I ◽  
Asclepias Syriaca ◽  
Force Microscopy ◽  
Atomic Force

Cellulose nanocrystals or nanoparticles (CNCs) has drawn a lot of attention due to their abundance, biocompatibility, renewability and their excellent mechanical properties paving the way to innovative and sustainable applications. In the present work, the stem residues of Asclepias Syriaca, better known as milkweed and generally regarded as a weed, was used for the first time to extract CNCs with a crystalline structure type-II (CNCs-II). Structural, thermal, morphological and mechanical properties of extracted CNCs-II were characterized by means of Fourier Transform Infrared (FT-IR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Dynamic Light Scattering (DLS), Thermogravimetric Analysis (TGA) and Atomic Force Microscopy (AFM). Asclepias Syriaca stem fibers revealed quite similar cellulose content as compared to other milkweed species and, stable suspensions made of nanosphere- and nanorod- shape CNCs-II were successfully extracted from raw milkweed fibers. In addition, after conversion from cellulose-I to cellulose-II by mercerization, milkweed cellulose-II exhibited higher thermal resistance as compared to cellulose-I with degradation temperature at 328 °C and 310 °C respectively. Finally, the transversal elastic modulus of individuals CNCs-II, as measured by atomic force microscopy, was found to be in the range of 3.5-27 GPa which is consistent with reported values for CNCs-I or -II in the literature.

Atomic Force Microscopy Studies of DNA-Wrapped Carbon Nanotube Structure and Binding to Quantum Dots

2008 ◽  
Vol 130 (32) ◽  
pp. 10648-10655 ◽  
Author(s):  
Jennifer F. Campbell ◽  
Ingrid Tessmer ◽  
H. Holden Thorp ◽  
Dorothy A. Erie
Keyword(s):  
Quantum Dots ◽  
Atomic Force Microscopy ◽  
Carbon Nanotube ◽  
Force Microscopy ◽  
Atomic Force

Atomic force microscopy of InAs quantum dots on the vicinal surface of a GaAs crystal

2002 ◽  
Vol 28 (2) ◽  
pp. 139-141
Author(s):  
V. P. Evtikhiev ◽  
O. V. Konstantinov ◽  
E. Yu. Kotel’nikov ◽  
A. V. Matveentsev ◽  
A. N. Titkov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Force Microscopy ◽  
Vicinal Surface ◽  
Gaas Crystal ◽  
Inas Quantum Dots ◽  
Force Microscopy ◽  
Atomic Force
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