Quantum dots can be made through lithography, colloidal synthesis, or epitaxy. Lithography uses a polymer mask and electron beam to pattern metal layers on quantum wells. Colloidal synthesis immerses semiconductor microcrystals in glass to form nearly equal sized microcrystals. Epitaxy involves growing smaller bandgap semiconductors on larger bandgap compounds, restricting growth with a mask to form quantum dots. Potential applications of quantum dots include computing, LEDs, photovoltaics, medical imaging, cell imaging, cancer detection and targeted drug delivery.
This presentation contains a basic introduction to quantum dots,their discovery, properties, applications,advantages,limitations and future prospects.It also contains a brief overview of experimental work carried out and results obtained during my summer term project.
Introduction
Nanoparticle characterization techniques
Electron Microscope
Scanning electron microscope
Transmission electron Microscope
X-ray powder diffraction
Nuclear Magnetic Resonance
This includes what is Quantum Dots and their properties ,types of synthesis methods of nano materials such as top down, bottom up etc.It includes few things about Carbon Quantum Dots.
This presentation contains a basic introduction to quantum dots,their discovery, properties, applications,advantages,limitations and future prospects.It also contains a brief overview of experimental work carried out and results obtained during my summer term project.
Introduction
Nanoparticle characterization techniques
Electron Microscope
Scanning electron microscope
Transmission electron Microscope
X-ray powder diffraction
Nuclear Magnetic Resonance
This includes what is Quantum Dots and their properties ,types of synthesis methods of nano materials such as top down, bottom up etc.It includes few things about Carbon Quantum Dots.
It's simple to understand the synthesis. Hydrothermal method is a chemical reaction in water in a sealed pressure vessel, which is in fact a type of reaction at both high temperature and pressure.
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
It's simple to understand the synthesis. Hydrothermal method is a chemical reaction in water in a sealed pressure vessel, which is in fact a type of reaction at both high temperature and pressure.
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
Quantum dots were discovered in solids (glass crystals) in 1980 by Russian physicist Alexei Ekimov while working at the Vavilov State Optical Institute. In late 1982, American chemist Louis E. Brus, then working at Bell Laboratories (and now a professor at Columbia University), discovered the same phenomenon in colloidal solutions (where small particles of one substance are dispersed throughout another; milk is a familiar example). These two scientists shared the Optical Society of America's 2006 R.W. Wood Prize for their pioneering work.
Nanocrystals called quantum dots have a range of optical and magnetic properties that make them useful in various applications. Learn more about quantum dots from us.
Quantum dots for optoelectronic devices - phdassistancePhD Assistance
Nanometre-scale semiconductor chips have been imagined as next-generation technology with high functionality and convergence. Quantum dots, also known as artificial atoms, have special properties owing to their quantum confinement in all three dimensions. Quantum dots have a lot of interest in optoelectronic systems because of their special properties.
For decades, self-assembled nanostructures have been a topic of considerable concern and significance.
Learn More:https://bit.ly/3xJJAiZ
Contact Us:
Website: https://www.phdassistance.com/
UK: +44 7537144372
India No:+91-9176966446
Email: info@phdassistance.com
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in this presentation i presented about quantum dots, chemical and physical methods that we can obtain or fabricates the quantum dots and also some important applications related to the quantum dots 's unique properties.
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Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
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The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
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https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
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The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
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Speakers:
Bob Boule
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Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
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Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
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But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
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1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
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All of this illustrated with link prediction over knowledge graphs, but the argument is general.
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5. HOW TO Make Quantum dots
Quantum dots can be made by various methods such as :
LITHEOGRAPHY
COLLIDAL SYNTHESIS
EPITAXY
6. Lithography
Quantum wells are covered with a polymer mask and
exposed to an electron or ion beam.
The surface is covered with a thin layer of metal, then
cleaned and only the exposed areas keep the metal layer.
Pillars are etched into the entire surface.
Multiple layers are applied this way to build up the
properties and size wanted.
Disadvantages: slow, contamination, low density,
defect formation.
7. Colloidal Synthesis
Immersion of semiconductor microcrystals in glass dielectric
matrices.
Taking a silicate glass with 1% semiconducting phase (CdS, CuCl,
CdSe, or CuBr).
Heating for several hours at high temperature.
Formation of microcrystals of nearly equal size.
Typically group II-VI materials (e.g. CdS, CdSe)
Size variations (“size dispersion”).
i.e: (PbS), (PbSe), (CdSe), (CdS), (InAs), (InP)
8. Epitaxy: Patterned Growth
Semiconducting compounds with a smaller
bandgap (GaAs) are grown on the surface of a
compoundwith a larger bandgap (AlGaAs).
Growth is restricted by coating it with a
masking compound (SiO2) and etching that
mask with the shape of the required crystal cell
wall shape.
Disadvantage: density of
quantum dots limited by
mask pattern.
9. Epitaxy: Self-Organized Growth
Uses a large difference in the lattice constants of the substrate
and the crystallizing material.
When the crystallized layer is thicker than the critical thickness,
there is a strong strain on the layers.
The breakdown results in randomly distributed islets of regular
shape and size.
Disadvantages: size and
shape fluctuations, ordering
10. Cadmium-free quantum dots
In many regions of the world there is now, or soon to be, legislation
to restrict and in some cases ban heavy metals in many household
appliances such as IT & telecommunication equipment, Lighting
equipment , Electrical & electronic tools, Toys, leisure & sports
equipment.
For QDs to be commercially viable in many applications they MUST
NOT CONTAIN cadmium or other restricted elements LIKE mercury,
lead, chromium.
So research has been able to create non-toxic quantum dots
using silicon.
13. Computing
Quantum dot technology is one of the most promising candidates
for use in solid-state quantum computation. By applying small voltages
to the leads, the flow of electrons through the quantum dot can be
controlled and thereby precise measurements of the spin and other
properties therein can be made. With several entangled quantum dots,
or qubits, plus a way of performing operations, quantum calculations
and the computers that would perform them might be possible.
14. Q-LED
Quantum dots may some day light your homes,
offices, streets,
and entire cities.
Quantum dot LED’s can now produce any color
of light, including
white.
Quantum dot LED’s are extremely energy
efficient. They use only
a few watts, while a regular incandescent
lamp uses 30 or more
watts for the same amount of light
15. Photovoltaic Devices:-
Quantum dots may be able to increase the efficiency and
reduce the cost of today's typical silicon photovoltaic cells.Quantum
dot photovoltaic would theoretically be cheaper to manufacture, as
they can be made "using simple chemical reactions."
16. Solar Cells
Photovoltaic effect:
p-n Junction.
Sunlight excites electrons and creates electron-hole pairs.
Electrons concentrate on one side of the cell and holes on
the other side.
Connecting the 2 sides creates electricity
17. Medical imaging
The photo belowshows human red blood cells, in which
specific membrane proteins are targeted andlabeled with
quantum dots. The number of purple features, which indicate
the nuclei ofmalaria parasites, increases as malaria
development progresses.
18. Cell imaging
Quantum dots last longer in your system
and are brighter than many organic dyes and
fluorescent proteins previously used to illuminate
the interiors of cells. They also have the
advantage of monitoring changes in cellular
processes while most high-resolution techniques
like only provide images of cellular processes
frozen at one moment Quantum dots (red dots
above) can be designed to bind to specific cell
receptors (green things). In this way researchers
can monitor all
kinds of processes in living cells
20. These quantum dots can be put into
single cells, or lots of cells, in the
tissue of living organisms. In future,
it is planned to attach specific
antibodies to the quantum dots –
when injected into a body, the
quantum dots will find and bind to
cancer cells, and illuminate them
when they fluoresce.CdSe/ZnS QDs used to image cancer cells in a live mouse.
CANCER CELL IMAGING
21. TARGETED DRUG DELIVERY
In this we attach drug molecules to
the quantum dots, which will then be
able to deliver the drug just to the
cancer cells where it is needed.
Current anti-cancer drugs tend to have
a range of unpleasant side-effects,
because they affect the whole body, not
just the cancer.