HOME >> BIOLOGY >> NEWS
Gold quantum dots have applications in biological labeling, nanoscale optics

A new class of water-soluble quantum dots made from small numbers of gold atoms could be the basis for a new biological labeling system with narrower excitation spectra, smaller particle size and comparable fluorescence to systems based on semiconductor quantum dots.

Providing the "missing link" between atomic and nanoparticle behavior in noble metals, these multi-electron "artificial atoms" could also serve as light-emitting sources in nanoscale optoelectronics and in energy transfer pairs.

"We have discovered a new class of quantum dots that are water soluble, strongly fluorescent, and display discrete excitation and emission spectra that make them potentially very useful for biological labeling," said Robert Dickson, associate professor in the School of Chemistry and Biochemistry at the Georgia Institute of Technology. "Their potential applications are really complementary to those of semiconductor quantum dots."

The gold nanodots are made up of 5, 8, 13, 23 or 31 atoms, each size fluorescing at a different wavelength to produce ultraviolet, blue, green, red and infrared emissions, respectively. The fluorescence energy varies according to the radius of the quantum dot, with the smallest structures the most efficient at light emission.

In contrast, quantum dots made from semiconductors such as cadmium selenide are much larger, containing hundreds or thousands of atoms. Semiconductor quantum dots obey different size scaling under confinement, producing weaker emissions.

The gold quantum dots were reported August 13 in the journal Physical Review Letters, and highlighted on the journal cover. Additional information on the work will be presented August 23rd at the 228th national meeting of the American Chemical Society in Philadelphia, PA. The work was sponsored by the National Science Foundation, National Institutes of Health, Sloan and Dreyfus Foundations, Blanchard and Vassar Woolley Endowments and the Georgia Tec
'"/>

Contact: John Toon
john.toon@edi.gatech.edu
404-894-6986
Georgia Institute of Technology Research News
23-Aug-2004


Page: 1 2 3 4

Related biology news :

1. Newly designed nanoparticle quantum dots simultaneously target and image prostate tumors in mice
2. 3-D imaging inside living organism, using quantum dots
3. Study reveals enzyme that behaves like a quantum inchworm
4. New textbook introduces students to the foundations, applications of nanotechnology
5. Biocompatibility to widen scope of biomaterial applications
6. Membrane separation technology produces myriad applications in numerous industries
7. R&D yields numerous applications for conductive polymers
8. Nanomuscles show promise in industrial and medical applications
9. Optical microsystems emerge in industrial applications
10. Discovery of dynamic sub-cellular processes could lead to medical applications
11. New materials hold promise for human healing applications

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/21/2020)... ... May 19, 2020 , ... ... software-as-a-service (SaaS) provider of operations management solutions, today introduced BioMed to their ... a cloud-based platform for connecting the people and systems around biomedical engineering ...
(Date:5/21/2020)... Ariz. (PRWEB) , ... May 20, 2020 , ... Law ... and remove danger for all of us. The positions of these men and women ... from the defense for not following rules precisely. Officers have always had to face ...
(Date:5/15/2020)... ... May 15, 2020 , ... The National Institutes of Health ... firm based in Frederick, Maryland and Tysons Corner, Virginia, to provide patent legal services ... a another in the field of chemistry. The firm is one of nine firms ...
Breaking Biology News(10 mins):
(Date:6/11/2020)... ... June 08, 2020 , ... Greffex, a leading genetic engineering ... proprietary clean viral vectors, recently announced a key manufacturing agreement with FUJIFILM Diosynth ... the world’s most successful gene therapy delivery vehicle (vector) with broad applications for ...
(Date:6/11/2020)... ... , ... Reducing carbon emissions has been and will continue to be a ... dips, ways to reduce CO2 is something we can’t avoid. , To protect ... being produced today are created from recycled cooking oil or crops. Unfortunately, these sources ...
(Date:5/30/2020)... ... May 29, 2020 , ... Medrio, ... and animal health markets, has enabled Cytovale, Inc., a medical technology company dedicated ... learning, to achieve their first patient in (FPI) in just seven days. The ...
(Date:5/28/2020)... , ... May 28, 2020 , ... The Security ... security leaders as the 2020 winners of the Women in Biometrics Awards ... IDEMIA , Biometric Update and the SIA Women in Security ...
Breaking Biology Technology:
Cached News: