Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > News > The challenge of creating visible and nontoxic nanomaterials for sensing

November 2nd, 2007

The challenge of creating visible and nontoxic nanomaterials for sensing

Abstract:
Nanotechnologies opened a new door towards the development of novel techniques and devices for probing biological systems such as biomolecules and single cells. The most reliable bioprobes today rely on fluorescent or radioactive labeling. Phosphorescent emitters are preferable for use in sensing or biological labeling schemes because the emission occurs over a very long timescale (for nanoscientists, 'very long timescale' is a relative term; here we are talking about 1 microsecond). Especially semiconductor nanocrystals (quantum dots) possess several properties that make them very attractive for fluorescent tagging: broad excitation spectrum, narrow emission spectrum, precise tunability of their emission peak, longer fluorescence lifetime than organic fluorophores and negligible photobleaching. Scientists have discovered that these nanocrystals can enable researchers to study cell processes at the level of a single molecule and may significantly improve the diagnosis and treatment of diseases such as cancers. However, the band gap of most emissive semiconductors, with the exception of cadmium-containing materials, is either too high or too low to easily make visible emitting quantum dots. Unfortunately, cadmium is quite toxic and therefore not really suitable for medical applications. In a step towards circumventing the issues with cadmium toxicity, researchers have make progress in demonstrating visible phosphorescence from doped nanocrystal systems. A recent example is the synthesis of a nanoscopic material composed of the non-toxic elements zinc, selenium, sulfur and manganese which displays efficient visible emission.

Source:
nanowerk.com

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Sensors

Graphene on toast, anyone? Rice University scientists create patterned graphene onto food, paper, cloth, cardboard February 13th, 2018

Leti Chief Scientist Barbara De Salvo Will Help Kick Off ISSCC 2018 with Opening-Day Keynote: In Addition, Leti Scientists Will Present and Demo New Technology for Piezoelectric Energy Harvesting February 8th, 2018

Engineers develop flexible, water-repellent graphene circuits for washable electronics January 24th, 2018

Leti to Demo New Curving Technology at Photonics West that Improves Performance of Optical Components January 18th, 2018

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

Photonic chip guides single photons, even when there are bends in the road February 16th, 2018

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers February 15th, 2018

Rutgers-Led Innovation Could Spur Faster, Cheaper, Nano-Based Manufacturing: Scalable and cost-effective manufacturing of thin film devices February 14th, 2018

Understanding brain functions using upconversion nanoparticles: Researchers can now send light deep into the brain to study neural activities February 14th, 2018

Nanobiotechnology

Arrowhead Receives Regulatory Clearance to Begin Phase 1/2 Study of ARO-HBV for Treatment of Hepatitis B February 15th, 2018

Arrowhead Pharmaceuticals Receives Orphan Drug Designation for ARO-AAT February 15th, 2018

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers February 15th, 2018

Understanding brain functions using upconversion nanoparticles: Researchers can now send light deep into the brain to study neural activities February 14th, 2018

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