Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button


DHgate

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

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Chip Technology

A metal that behaves like water: Researchers describe new behaviors of graphene February 12th, 2016

Silicon chip with integrated laser: Light from a nanowire: Nanolaser for information technology February 12th, 2016

Research reveals carbon films can give microchips energy storage capability: International team from Drexel University and Paul Sabatier University reveals versatility of carbon films February 11th, 2016

New thin film transistor may lead to flexible devices: Researchers engineer an electronics first, opening door to flexible electronics February 10th, 2016

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

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Quantum Dots/Rods

Nanoscale cavity strongly links quantum particles: Single photons can quickly modify individual electrons embedded in a semiconductor chip and vice versa February 8th, 2016

The iron stepping stones to better wearable tech without semiconductors February 8th, 2016

QD Vision Named to the 2015 Global Cleantech 100 Under the Radar List: Quantum Dot Leader Recognized for Clean Technology Innovation January 26th, 2016

Light-activated nanoparticles prove effective against antibiotic-resistant 'superbugs' January 19th, 2016

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







Car Brands
Buy website traffic