Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Engineers Produce How-To Guide for Controlling the Structure of Nanoparticles

Abstract:
Tiny objects known as nanoparticles are often heralded as holding great potential for future applications in electronics, medicine and other areas. The properties of nanoparticles depend on their size and structure. Now researchers from North Carolina State University have learned how to consistently create hollow, solid and amorphous nanoparticles of nickel phosphide, which has potential uses in the development of solar cells and as catalysts for removing sulfur from fuel. Their work can now serve as a "how-to" guide for other researchers to controllably create hollow, solid and amorphous nanoparticles - in order to determine what special properties they may have.

Engineers Produce How-To Guide for Controlling the Structure of Nanoparticles

Raleigh, NC | Posted on September 24th, 2009

The study provides a step-by-step analysis of how to create solid or hollow nanoparticles that are all made of the same material. "It's been known that these structures could be made," says Dr. Joe Tracy, an assistant professor of material science engineering at NC State and co-author of the paper, "but this research provides us with a comprehensive understanding of nanostructural control during nanoparticle formation, showing how to consistently obtain different structures in the lab." The study also shows how to create solid nanoparticles that are amorphous, meaning they do not have a crystalline structure.

Tracy explains that there is a great deal of interest in the formation of hollow nanoparticles and amorphous nanoparticles. But for many kinds of nanoparticles, there had previously been no clear understanding of how to control the formation of these structures. As a result of the new study, Tracy says, "nanoparticles with desired structures can be made more consistently, making it easier for researchers to determine their electronic, optical and catalytic properties." For example, amorphous nanoparticles may be of use in future electronic applications or for nanostructure fabrication. Tracy stresses that while the NC State researchers were able to show how to create hollow nanoparticles and amorphous nanoparticles, they were not able to create nanoparticles that were both hollow and amorphous.

The study could also have implications for many additional types of nanoparticles, not just nickel phosphide. Tracy says that the findings "could provide important insights for further studies to control the structures of many other kinds of nanoparticles, with a wide array of potential applications." These could include metal oxide, sulfide, selenide and phosphide nanoparticles.

Specifically, the researchers found that they could control whether nickel phosphide nanoparticles would be hollow or solid by adjusting the ratio of phosphorus to nickel reactants when they synthesized the nanoparticles. The researchers found that they could create amorphous solid nanoparticles by controlling the temperature.

The study, "Nickel Phosphide Nanoparticles with Hollow, Solid, and Amorphous Structures," was co-authored by Tracy, NC State post-doctoral researcher Junwei Wang and NC State Ph.D. student Aaron Johnston-Peck. The research was funded by NC State and the National Science Foundation, and was published online by Chemistry of Materials.


Note: The study abstract follows.

"Nickel Phosphide Nanoparticles with Hollow, Solid, and Amorphous Structures"

Authors: Junwei Wang, Aaron C. Johnston-Peck, Joe Tracy, North Carolina State University

Published: Online, September 16, 2009, Chemistry of Materials

Abstract: Conversion of unary metal nanoparticles (NPs) upon exposure to O, S, Se, and P precursors usually produces hollow metal oxide, sulfide, selenide, or phosphide NPs through the Kirkendall effect. Here, nanostructural control of mixed-phase Ni2P/Ni12P5 (represented as NixPy) NPs prepared through thermolysis of nickel acetylacetonate using trioctylphosphine (TOP) as a ligand and phosphorous precursor is reported. The P:Ni mole ratio controls the NP size and is the key factor in determining the nanostructure. For P:Ni mole ratios of 1-3, Ni NPs form below 240 C and subsequently convert to crystalline-hollow NixPy NPs at 300 C. For higher P:Ni ratios, a Ni-TOP complex forms that requires higher temperatures for NP growth, thus favoring direct formation of NixPy rather than Ni. Consequently, for P:Ni mole ratios greater than 9, amorphous-solid NixPy NPs form at 240 C and become crystalline-solid NixPy NPs at 300 C. For intermediate P:Ni mole ratios of ~6, both growth mechanisms give rise to a mixture of hollow and solid NixPy NPs. Similar results have been obtained using tributlyphosphine or triphenyphosphine as the phosphorous source, but trioctylphosphine oxide cannot serve as a phosphorous source.

####

For more information, please click here

Contacts:
Mick Kulikowski
News Services
919.515.8387


Dr. Joe Tracy
919.513.2623

Copyright © North Carolina State University

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

Iran to Hold 3rd Int'l Engineering Materials, Metallurgy Conference October 25th, 2014

Haydale Secures Exclusive Development and Supply Agreement with Tantec A/S: New reactors to be built and commissioned by Tantec A/S represent another step forward towards the commercialisation of graphene October 24th, 2014

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

SUNY Polytechnic Institute Invites the Public to Attend its Popular Statewide 'NANOvember' Series of Outreach and Educational Events October 23rd, 2014

Discoveries

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

Iranian, Malaysian Scientists Study Nanophotocatalysts for Water Purification October 23rd, 2014

Nanoparticle technology triples the production of biogas October 23rd, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 2014

Materials/Metamaterials

Iran to Hold 3rd Int'l Engineering Materials, Metallurgy Conference October 25th, 2014

Researchers patent a nanofluid that improves heat conductivity October 22nd, 2014

Materials for the next generation of electronics and photovoltaics: MacArthur Fellow develops new uses for carbon nanotubes October 21st, 2014

Super stable garnet ceramics may be ideal for high-energy lithium batteries October 21st, 2014

Announcements

Iran to Hold 3rd Int'l Engineering Materials, Metallurgy Conference October 25th, 2014

Haydale Secures Exclusive Development and Supply Agreement with Tantec A/S: New reactors to be built and commissioned by Tantec A/S represent another step forward towards the commercialisation of graphene October 24th, 2014

QuantumWise guides the semiconductor industry towards the atomic scale October 24th, 2014

Strengthening thin-film bonds with ultrafast data collection October 23rd, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE