High-density one-dimensional well-aligned germanium quantum dots on a nanoridge array

2008 ◽  
Vol 93 (8) ◽  
pp. 083101 ◽  
Author(s):  
Yan-Ru Chen ◽  
Chieh-Hsiung Kuan ◽  
Yuen-Wuu Suen ◽  
Yu-Hwa Peng ◽  
Peng-Shiu Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Density ◽  
One Dimensional ◽  
Germanium Quantum Dots

High-density two-color micro-LED array based on brushing-assisted micropatterning of quantum dots

2021 ◽  
Author(s):  
Dacheng Mao ◽  
Zheshun Xiong ◽  
Matthew Donnelly ◽  
Guangyu Xu
Keyword(s):  
Quantum Dots ◽  
High Density ◽  
Led Array

scholarly journals High-density assembly of nanocrystalline silicon quantum dots

2006 ◽  
Vol 6 (3) ◽  
pp. 344-347 ◽  
Author(s):  
A. Tanaka ◽  
G. Yamahata ◽  
Y. Tsuchiya ◽  
K. Usami ◽  
H. Mizuta ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nanocrystalline Silicon ◽  
High Density ◽  
Silicon Quantum Dots

scholarly journals Synthesis, Surface Modification and Purification of Silicon and Germanium Quantum Dots for Biological Applications

2021 ◽  
Author(s):  
◽  
Amane Shiohara
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Silica Nanoparticles ◽  
Microemulsion System ◽  
Biological Applications ◽  
Silicon Quantum Dots ◽  
Surface Molecules ◽  
Silicon And Germanium ◽  
Germanium Quantum Dots ◽  
Oxygen Atoms

<p>Quantum dots have applications in biomedical fields such as bio-imaging and drug delivery systems. This thesis describes research on silicon and germanium nanoparticles (quantum dots) synthesis and surface modification for biological applications. Purification methods of these quantum dots were also explored. In chapter 6 the application of silica nanoparticles into dry eye diagnosis was studied. The purpose of this research is to contribute the application of nanotechnology into biological fields. The crystalinity of the quantum dots was characterised by Transmission Electron Microscopy (TEM) and Selected Area Electron Diffraction analysis (SAED). The molecules on the surface of the quantum dots were characterised by Fourier Transform Infrared spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR).  Silicon quantum dots were synthesised with a microemulsion system and various types of molecules were attached on the surface of the silicon quantum dots. However, some of the capping molecules which have oxygen atoms tend to form bonds between oxygen and silicon. Therefore, in the later chapter (chapter 4) various chemical reactions were conducted on the molecules attached to the silicon quantum dots. The silicon quantum dots were capped with diene molecules and one of the double bonds was left on the terminal end. The terminal end double bonds were converted to the functional groups which contain oxygen atoms to form peptide bonds. In this way it was confirmed that it can reduce the risk of oxygen atoms to be attached on the surface of the silicon quantum dots. The molecules on the surface of the silicon quantum dots were characterised mainly by FTIR and ¹H NMR. Optical properties and cyto-toxicity of these silicon quantum dots were also measured and analysed depending on the surface molecules.  Two synthetic approaches were taken to produce germanium quantum dots. The first approach was the microemulsion system at room temperature. Different combinations of the surfactant and capping molecules were tested. For the second approach, high temperature bench top system was applied. In this method the bio-friendly molecules which have high boiling points were chosen as capping agents. The surface molecules were characterised by FTIR spectroscopy.  In chapter 6 the synthesis of dye molecules conjugated silica nanoparticles was described. The purpose of this research is to produce biologically safe nanoparticles which can be applied in dry eye diagnosis. Three different dyes were used to conjugate with the silica nanoparticles. Only fluorescein isothiocyanate (FITC) succeeded in conjugating with the nanoparticles. Optical properties of this sample were measured and compared with the free dye molecule. Also the sample was applied in human eyes to analyse the tear film layer.  An overall conclusion and future plans for the research were given in the last chapter.In this chapter, ideas of overcoming the problems and improving the techniques conducted in the research were described.</p>

scholarly journals Experiments towards size and dopant control of germanium quantum dots for solar applications

2015 ◽  
Vol 3 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Brittany L. Oliva-Chatelain ◽  
◽  
Andrew R. Barron
Keyword(s):  
Quantum Dots ◽  
Germanium Quantum Dots ◽  
Solar Applications

EXCITON-MEDIATED RAMAN SCATTERING IN ONE-DIMENSIONAL QUANTUM DOTS

2011 ◽  
Vol 25 (32) ◽  
pp. 4387-4393 ◽  
Author(s):  
HAI-CHAO SUN ◽  
CUI-HONG LIU
Keyword(s):  
Quantum Dots ◽  
Differential Cross Section ◽  
Raman Scattering ◽  
Cross Section ◽  
Differential Cross ◽  
Semiconductor Quantum Dots ◽  
Scattering Process ◽  
One Dimensional ◽  
Intermediate States ◽  
Potential Frequency

The differential cross section (DCS) for exciton-mediated Raman scattering (EMRS) in one-dimensional semiconductor quantum dots is presented. The exciton states are considered as intermediate states in the Raman scattering process. The selection rules for the EMRS process are studied. The numerical results show that the contribution to DCS indicated by exciton is larger than that by electron. DCS of EMRS is larger when there is a bigger confinement potential frequency.

scholarly journals One-dimensional electron fluid at high density

2018 ◽  
Vol 98 (12) ◽  
Author(s):  
Vinod Ashokan ◽  
N. D. Drummond ◽  
K. N. Pathak
Keyword(s):  
High Density ◽  
Dimensional Electron ◽  
One Dimensional ◽  
Electron Fluid
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