- About Us
- Career Center
- Nano-Social Network
- Nano Consulting
- My Account
September 11th, 2011
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.
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.
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.
|Related News Press|
News and information
RMIT researchers make leap in measuring quantum states July 21st, 2016
New reaction for the synthesis of nanostructures July 21st, 2016
Research team led by NUS scientists develop plastic flexible magnetic memory device: Novel technique to implant high-performance magnetic memory chip on a flexible plastic surface without compromising performance July 21st, 2016
Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers
Graphene photodetectors: Thinking outside the 2-D box July 21st, 2016