Quantum dots

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Quantum dots (QD) are semiconductors made via several possible routes. John Ashmead discusses how they are made, their properties and their applications in research.

Science

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Quantum Dots
John
Ashmead

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
What are Quantum Dots?

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Size
Matters

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
One source of light,
multiple colors

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Blinking QDots!

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Heavy Metal

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Square Well
http://what-when-how.com/nanoscience-and-nanotechnology/quantum-dots-inelastic-light-
scattering-from-electronic-excitations-part-1-nanotechnology/

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Band gap

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Rise

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
And Fall

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Lithography

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Epitaxy
In self-assembly of QDs,
one makes use of an island
formation in epitaxial
growth. The effect is
similar to the formation of
water droplets on a well-
phished surface.

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Colloidal production

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Stenotrophomonas
maltophilia ➫ QDots

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Who knew?

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
http://www.gartner.com/newsroom/id/3114217
Universal Curve of
Hype!

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
QD as Fast as Possible

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Solar panels
http://www.dailytech.com/New+Solar+Cell+Gives+Its+110+Percent+in+Efﬁciency/
article23548.htm

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
the Quantum Dot
(QD)
spectrometer
device is printing
QD ﬁlters — a
key fabrication
step.
…
The optical
structure — QD
ﬁlters — are
generated by
printing liquid
droplets.

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Mouse Intestines at
Night

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Slightly dotty Mice

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Probes

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Little tiny body ships

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
QDs changing medicine

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Labeling Tumors

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Entanglement

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Quantum Computing

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Maxwell’s Demon

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
“There’s Plenty of Room at the
Bottom”
- Richard P. Feynman

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
How 2 make QDs at Home

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
What can we brew up
with QDots?

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
What can we brew up
with QDots?
• Sweet spot between atoms &
macroscopic structures

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
A steal at $765.38!(+ Shipping)

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Science Writer
Needed!

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Science Writer
Needed!
• Look for Nanotech

http://timeandquantummechanics.comQuantum Dots - Balticon, May 28th, 2016
Science Writer
Needed!
• Look for Nanotech
• Wikipedia article not
that useful — techy

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Normal Cell Metabolism: Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function. Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released. Cell utilize energy in the form of ATP. The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process. Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP. The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos). It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation. If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use. IN CANCER CELL: Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful. Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation. This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive. Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful. Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation. This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive. introduction to WARBERG PHENOMENA: WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside. Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme. WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.

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Quantum dots

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Quantum dots

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