Nano Science and Technology InstituteNano Science and Technology Institute
Nano Science and Technology Institute 2004 NSTI Nanotechnology Conference & Trade Show
Nanotech 2004
BioNano 2004
Program
Topics & Tracks
Sunday
Monday
Tuesday
Wednesday
Thursday
Index of Authors
Keynotes
Awards
Tutorials
Business & Investment
2004 Sub Sections
Sponsors
Exhibitors
Venue 2004
Proceedings
Organization
Press Room
Purchase CD/Proceedings
NSTI Events
Subscribe
Site Map
Nanotech Proceedings
Nanotechnology Proceedings
Supporting Organizations
Nanotech Supporting Organizations
Media Sponsors
Nanotech Media Sponsors
Event Contact
696 San Ramon Valley Blvd., Ste. 423
Danville, CA 94526
Ph: (925) 353-5004
Fx: (925) 886-8461
E-mail:
 
 

Atomic-scale Structure of Nanocrystals by the Atomic Pair Distribution Function Technique

V. Petkov
Central Michigan University, US

Keywords: structure, x-ray diffraction

Abstract:
Knowledge of the atomic-scale structure is an important prerequisite to understand and control the properties of materials. In the case of crystals it is obtained solely from the Bragg peaks in their diffraction pattern and is given in terms of a small number of atoms placed in a unit cell subjected to symmetry constraints. However, many materials of technological importance, including nanophase materials, do not possess the long-range order and 3D periodicity of conventional crystals and it is this deviation from perfect order that makes them technologically and/or scientifically important. The diffraction patterns of such materials show a pronounced diffuse component and a few Bragg peaks, if any. This limits the applicability of the traditional techniques for structure determination and makes it difficult to obtain precise structural information needed in nanotechnology applications. In the talk we will show that this challenge can be met and the atomic-scale structure of nanocrystals determined by employing a nontraditional experimental approach going beyond the Bragg scattering in the diffraction data. The approach is that of the atomic pair distribution function technique (PDF). It takes both the diffuse and Bragg components of the diffraction data into account and yields the atomic ordering in terms of quantitative parameters such as a unit cell and symmetry even when the material is ordered only on the nanometer length scale. The talk will be illustrated with examples from successful structural studies on bulk nanocrystals such as LiMoS2(1), V2O5.nH2O nanoribbons(2, see Fig.1) and Cs nanoclusters (3, see Fig.2). New structural data for dendrimer nanoparticles and vanadium oxide nanotubes will be presented as well. (see attached PDF file for full abstract)

Nanotech 2004 Conference Technical Program Abstract

 
Sponsors
Nanotech Sponsors
News Headlines
NSTI Online Community
 
 

© Nano Science and Technology Institute, all rights reserved.
Terms of use | Privacy policy | Contact