Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Iranian Scientists Synthesize Core-Shell Nanocrystals through Surfactant-Free Technique

Abstract:
Iranian researchers at Ferdowsi University of Mashhad devised a new scheme for preparation of core-shell nanocrystals, by combining the microemulsion and ultrasonication methods, which features moderate synthesis conditions and does not require any surfactants.

Iranian Scientists Synthesize Core-Shell Nanocrystals through Surfactant-Free Technique

Tehran, Iran | Posted on July 5th, 2012

The properties of core-shell composites depend heavily on the materials constituting both the core and the shell parts. These compounds offer superiorities in terms of dimension, optical properties, electronic characteristics, etc. so that they have found various applications in photovoltaic cells, optical sensors and catalysis technology, just to mention a few areas.

As reported in a previous work available in the literature, a thin shell of a wide-band gap semiconductor has been deposited upon a small-band gap semiconducting core substrate through an innovative method. Despite its own advantages, the mentioned method is prone to yield non-uniform deposition of inorganic materials on small cores. Besides, the fabrication process demands high temperatures and long aging times as its other downsides.

In an attempt to refine and improve the aforementioned synthesis method, a number of researchers at the Ferdowsi University of Mashhad have come up with core-shell CdS/TiO2 nanocomposites via a surfactant-free approach.

The researchers initially prepared CdS nanoparticles by means of ultrasonication and microemulsification without adding any surfactants. The synthesized nanoparticles were then mixed with TiO2 under ultrasonic irradiation. The latter caused the formation of a thin layer of TiO2 over the CdS nanoparticles and resulted in their swelling. The formation of core-shell structures is due to the involved cavitation phenomenon which forces powerful and high-speed collisions of the nanoparticles. In addition, the ultrasonic waves control the condensation and hydrolysis of titanium tetra isopropoxide as well as shaping of the TiO2 shell.

####

For more information, please click here

Copyright © Fars News Agency

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

SouthWest NanoTechnologies Introduces AgeNT™ Transparent Conductor System at SID Display Week, Booth #543 May 28th, 2015

New technique speeds nanoMRI imaging: Multiplexing technique for nanoscale magnetic resonance imaging developed by researchers in Switzerland cuts normal scan time from two weeks to two days May 28th, 2015

Squeezed quantum cats May 28th, 2015

New chip makes testing for antibiotic-resistant bacteria faster, easier: Researchers at the University of Toronto design diagnostic chip to reduce testing time from days to one hour, allowing doctors to pick the right antibiotic the first time May 28th, 2015

Chemistry

Chemists discover key reaction mechanism behind the highly touted sodium-oxygen battery May 28th, 2015

Sensors

SouthWest NanoTechnologies Introduces AgeNT™ Transparent Conductor System at SID Display Week, Booth #543 May 28th, 2015

Technology for Tomorrow’s Market Opportunities and Challenges: LetiDays Grenoble Presents the Possibilities: June 24-25 Event Includes Focus on IoT-Augmented Mobility and Leti’s Latest Results on Silicon Technologies, Sensors, Health Applications and Smart Cities May 27th, 2015

This Slinky lookalike 'hyperlens' helps us see tiny objects: The photonics advancement could improve early cancer detection, nanoelectronics manufacturing and scientists' ability to observe single molecules May 23rd, 2015

Record high sensitive Graphene Hall sensors May 21st, 2015

Discoveries

Chemists discover key reaction mechanism behind the highly touted sodium-oxygen battery May 28th, 2015

New technique speeds nanoMRI imaging: Multiplexing technique for nanoscale magnetic resonance imaging developed by researchers in Switzerland cuts normal scan time from two weeks to two days May 28th, 2015

Squeezed quantum cats May 28th, 2015

New chip makes testing for antibiotic-resistant bacteria faster, easier: Researchers at the University of Toronto design diagnostic chip to reduce testing time from days to one hour, allowing doctors to pick the right antibiotic the first time May 28th, 2015

Materials/Metamaterials

SouthWest NanoTechnologies Introduces AgeNT™ Transparent Conductor System at SID Display Week, Booth #543 May 28th, 2015

Physicists precisely measure interaction between atoms and carbon surfaces May 28th, 2015

Linking superconductivity and structure May 28th, 2015

Controlled Release of Anticorrosive Materials in Spot by Nanocarriers May 27th, 2015

Announcements

Chemists discover key reaction mechanism behind the highly touted sodium-oxygen battery May 28th, 2015

New technique speeds nanoMRI imaging: Multiplexing technique for nanoscale magnetic resonance imaging developed by researchers in Switzerland cuts normal scan time from two weeks to two days May 28th, 2015

Squeezed quantum cats May 28th, 2015

New chip makes testing for antibiotic-resistant bacteria faster, easier: Researchers at the University of Toronto design diagnostic chip to reduce testing time from days to one hour, allowing doctors to pick the right antibiotic the first time May 28th, 2015

Energy

Technology for Tomorrow’s Market Opportunities and Challenges: LetiDays Grenoble Presents the Possibilities: June 24-25 Event Includes Focus on IoT-Augmented Mobility and Leti’s Latest Results on Silicon Technologies, Sensors, Health Applications and Smart Cities May 27th, 2015

Physicists solve quantum tunneling mystery: ANU media release: An international team of scientists studying ultrafast physics have solved a mystery of quantum mechanics, and found that quantum tunneling is an instantaneous process May 27th, 2015

Fine-tuned molecular orientation is key to more efficient solar cells May 26th, 2015

DNA Double Helix Does Double Duty in Assembling Arrays of Nanoparticles: Synthetic pieces of biological molecule form framework and glue for making nanoparticle clusters and arrays May 25th, 2015

Photonics/Optics/Lasers

DNA Double Helix Does Double Duty in Assembling Arrays of Nanoparticles: Synthetic pieces of biological molecule form framework and glue for making nanoparticle clusters and arrays May 25th, 2015

This Slinky lookalike 'hyperlens' helps us see tiny objects: The photonics advancement could improve early cancer detection, nanoelectronics manufacturing and scientists' ability to observe single molecules May 23rd, 2015

Samtec, Global Provider of Interconnect Systems, Joins IRT Nanoelec Silicon Photonics Program May 21st, 2015

Taking control of light emission: Researchers find a way of tuning light waves by pairing 2 exotic 2-D materials May 20th, 2015

Solar/Photovoltaic

Fine-tuned molecular orientation is key to more efficient solar cells May 26th, 2015

Efficiency record for black silicon solar cells jumps to 22.1 percent: Aalto University's researchers improved their previous record by over 3 absolute percents in cooperation with Universitat Politècnica de Catalunya May 18th, 2015

Wearables may get boost from boron-infused graphene: Rice U. researchers flex muscle of laser-written microsupercapacitors May 18th, 2015

Random nanowire configurations increase conductivity over heavily ordered configurations May 16th, 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