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A
quantum
dot is a semiconductor whose excitons are confined in
all three spatial dimensions. As a result, they have properties that are
between those of bulk semiconductors and those of discrete molecules.
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Nanometer sized semiconductor particles, made of cadmium
selenide (cdse), cadmium sulfide (cds) or cadmium telluride (cdte) with an
inert polymer
coating. The semiconductor material used for the core is
chosen based upon the emission wavelength
range being targeted: cds for UV-blue, cdse for the bulk of the visible
spectrum, cdte for the far red and near-infrared, with the particle's size
determining the exact color of a given quantum
dot. The polymer
coating safeguards cells
from cadmium toxicity but also affords the opportunity to attach any variety
targeting molecules,
including monoclonal antibodies directed to tumor-specific biomarkers. Because of their small size, quantum dots can function as cell- and even molecule-specific
markers that will not interfere with the normal
workings of a cell.
In addition, the availability of quantum
dots of different colors provides a powerful tool for following the actions
of multiple cells
and molecules
simultaneously.
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Nanoscale particle that exhibits size-dependent electronic
and optical
properties due to quantum
confinement
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Discrete
nanoscale
semiconductor or metal structure that exhibits
size-dependent electronic
and optical
properties due to quantum
confinement
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A
nanoscale
crystalline structure made from cadmium selenide that absorbs white light and
then re-emits it a couple of nanoseconds
later in a specific color. The quantum
dot was originally investigated for possible computer applications. Recently, researchers are
investigating the use of quantum
dots for medical applications,
using the molecule-sized
crystals
as probes to track antibodies, viruses, proteins,
or DNA within the human body.
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A
nano-scale crystalline structure that can transform
the colour of light. The quantum
dot is considered to have greater flexibility than other fluorescent
materials, which makes it suited to use in building nano-scale
computing applications
where light is used to process information. They are made from a variety of
different compounds, such as cadmium selenide.
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A
dot with an extension of several nanometer
constructed of metallic or semiconductive material describing a nearly
zero-dimensional object. These quantum
dots have unique electrical properties, which can be used to store electrons for example or to transform the color of
light. The quantum
dot is considered to have greater flexbility than other fluorescent
materials, which makes it suited to use in building nanoscale
computing applications
where light is used to process information. They are made from a variety of
different compounds, such as cadmium selenide.
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A
crystal
of semiconductor compound (eg. Cdse, pbs) with a
diameter on the order of the compound's Exciton Bohr Radius. Quantum dots have a range of useful electrical and optical properties that diverge in character from
those of bulk material. Quantum
dots are between 2 and 10 nanometers
wide (10 and 50 atoms).
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Nanometer-sized semiconductor crystals,
or electrostatically confined electrons.
Something (usually a semiconductor island) capable of confining a
single electron,
or a few, and in which the electrons
occupy discrete energy
states just as they would in an atom (quantum
dots have been called "artificial atoms").
[CMP] Other terminology reflects the preoccupations of different branches of
research: microelectronics folks may refer to a "single-electron transistor"
or "controlled potential barrier," whereas quantum physicists may speak of a "Coulomb
island" or "zero-dimensional gas" and chemists may speak of a
"colloidal nanoparticle" or
"semiconductor nanocrystal."
All of these terms are, at various times, used interchangeably with "quantum dot," and they refer more or less to
the same thing: a trap that confines electrons
in all three dimensions. [from Hacking Matter: Levitating Chairs, Quantum Mirages, and the Infinite Weirdness of
Programmable Atoms.
Wil mccarthy. February 2003]
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A
semiconductor nanocrystal
that exhibits quantum
behaviour in optical
or electrical processes
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A
nano-scale crystalline structure that can transform
the colour of light. The quantum
dot is considered to have greater flexibility than other fluorescent
materials, which makes it suited to use in building nano-scale
computing applications
where light is used to process information. They are made from a variety of
different compounds, such as cadmium selenide.
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Nanometer-sized semiconductor crystals,
or electrostatically confined electrons.
Something (usually a semiconductor island) capable of confining a
single electron,
or a few, and in which the electrons
occupy discrete energy
states just as they would in an atom (quantum
dots have been called "artificial atoms").
[cmp] other terminology reflects the preoccupations of different branches of
research: microelectronics folks may refer to a "single-electron transistor"
or "controlled potential barrier," whereas quantum physicists may speak of a "coulomb
island" or "zero-dimensional gas" and chemists may speak of a
"colloidal nanoparticle" or
"semiconductor nanocrystal."
all of these terms are, at various times, used interchangeably with "quantum dot," and they refer more or less to
the same thing: a trap that confines electrons
in all three dimensions. [from hacking matter: levitating chairs, quantum mirages, and the infinite weirdness of
programmable atoms.
Wil mccarthy. February 2003]
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An
object so small that adding or removing a single electron
represents a significant change.
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Grouping
of atoms so small that the addition or removal of an electron will change its properties in a
significant way.
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