Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > News > Quantum Dots Get Smaller

May 13th, 2005

Quantum Dots Get Smaller

Abstract:
For all the hype about nanotechnology, sometimes small isn't quite small enough. Quantum dots enable imaging advances in fields from oncology to neuroscience, yet at a whopping dozen nanometers or more, sometimes they're just too big. "They're the size of proteins," says Marcel P. Bruchez, cofounding scientist at Quantum Dots Corp. "Anything you can do to minimize the size will minimize the impact on the biological system."

A quantum dot's size governs the color of light it emits, but the size that determines the optical properties is only the core-shell. The problem is that for biological applications, quantum dots must be changed from being hydrophobic as grown, to hydrophilic, without a loss in fluorescence or stability.

The solution is to create the high-tech equivalent of a peanut M&M: a semiconductor core (usually cadmium sulfide, selenide, or telluride), coated by an insulating shell, which is then given a ligand coating, sometimes called a cap. The amphiphilic ligand is hydrophobic where it interfaces with the shell and hydrophilic where it interfaces with the biological conjugate (e.g., antibodies, peptides, or oligonucleotides) and the environment.

Source:
* The Scientist

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Quantum Dots Corp.

Moungi Bawendi

Shimon Weiss

Evident Technologies

Shuming Nie

Related News Press

Possible Futures

Smaller, faster, cheaper: A new type of modulator for the future of data transmission July 27th, 2015

Researchers predict material with record-setting melting point July 27th, 2015

Global Corrosion Resistant Nano Coatings Market To 2015: Acute Market Reports July 27th, 2015

Global Zinc oxide nanopowders Industry 2015: Acute Market Reports July 25th, 2015

Nanomedicine

March 2016; 6th Int'l Conference on Nanostructures in Iran July 29th, 2015

Non-Enzyme Sensor Determines Level of Blood Sugar July 29th, 2015

Flexible Future of Point-of-Care Disease Diagnostic July 29th, 2015

Stretching the limits on conducting wires July 25th, 2015

Announcements

Non-Enzyme Sensor Determines Level of Blood Sugar July 29th, 2015

Flexible Future of Point-of-Care Disease Diagnostic July 29th, 2015

Meet the high-performance single-molecule diode: Major milestone in molecular electronics scored by Berkeley Lab and Columbia University team July 29th, 2015

Detecting small metallic contaminants in food via magnetization: A practical metallic-contaminant detecting system using three high-Tc RF superconducting quantum interference devices (SQUIDs) July 29th, 2015

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