Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > News > Novel Developments for Semiconductor Quantum Dots

September 11th, 2011

Novel Developments for Semiconductor Quantum Dots

Abstract:
Semiconductor quantum dots (QDs) are nanoparticles or nanorods made of a semiconductor material. Because of their unique properties, they can be used in many fields, such as medicine and electronics. Here, we give a description of how QDs work and of some of their most novel applications.
Semiconductors

A material behaves as a semiconductor when its electrical conductivity is in between that of an insulator and that of a conductor.

The mechanism of the conductivity in a semiconductor is shown in the Figure below. Electrons, normally in the valence band, have to be promoted into the conduction band; for this to happen, an appropriate amount of energy has to be absorbed by the material. This value, called the band gap, is different depending on the material.
Nano-dimensions

The peculiarity of QDs is that they combine their semiconductor properties with

Valance and conduction bands in a semiconductor. Photo by mitopensourseware

those of a nanomaterial.

A nanomaterial is a material having at least one dimension in the order of nanometers (10-9 m), this usually meaning smaller than about 100 nm. Examples are nanoparticles (particles with a nanoscale diameter), nanorods (rods with all dimensions in the nanoscale) or nanofibres (fibers with a nanoscale diameter), and nanofilms (thin films with a nanoscale thickness). Due to their small dimensions, the properties of nanomaterials are normally different from those of the corresponding bulk material.

Source:
decodedscience.com

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Ag/ZnO-Nanorods Schottky diodes based UV-PDs are fabricated and tested May 26th, 2017

New metamaterial-enhanced MRI technique tested on humans May 26th, 2017

Controlling 3-D behavior of biological cells using laser holographic techniques May 26th, 2017

Unveiling the quantum necklace: Researchers simulate quantum necklace-like structures in superfluids May 26th, 2017

Chip Technology

Researchers find new way to control light with electric fields May 25th, 2017

Nanometrics Announces Retirement Plans of CEO Timothy Stultz: Dr. Stultz to Continue as Director May 25th, 2017

GLOBALFOUNDRIES and Chengdu Partner to Expand FD-SOI Ecosystem in China: More than $100M investment to establish a center of excellence for FDXTM FD-SOI design May 23rd, 2017

Plasmon-powered upconversion nanocrystals for enhanced bioimaging and polarized emission: Plasmonic gold nanorods brighten lanthanide-doped upconversion superdots for improved multiphoton bioimaging contrast and enable polarization-selective nonlinear emissions for novel nanoscal May 19th, 2017

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Ag/ZnO-Nanorods Schottky diodes based UV-PDs are fabricated and tested May 26th, 2017

New metamaterial-enhanced MRI technique tested on humans May 26th, 2017

Controlling 3-D behavior of biological cells using laser holographic techniques May 26th, 2017

Unveiling the quantum necklace: Researchers simulate quantum necklace-like structures in superfluids May 26th, 2017

Quantum Dots/Rods

The brighter side of twisted polymers: Conjugated polymers designed with a twist produce tiny, brightly fluorescent particles with broad applications May 16th, 2017

Nanoparticles open new window for biological imaging: “Quantum dots” that emit infrared light enable highly detailed images of internal body structures April 10th, 2017

Particle Works creates range of high performance quantum dots February 23rd, 2017

Strem Chemicals and Dotz Nano Ltd. Sign Distribution Agreement for Graphene Quantum Dots Collaboration February 21st, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project