The work was supported by NSF through Grant No. DMR 0304391 (NIRT) and CMU through Grant No. REF C602281. Use of the Advanced Photon Source was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Journal of Applied Physics
X-rays -- Diffraction, Nanocrystals -- Structure, Transmission electron microscopy, Quantum dots -- Research
The three-dimensional structure of oleic acid-capped CdSe and thiol-capped CdTe nanocrystals used as quantum dots has been determined by total synchrotron radiationx-ray diffraction and atomic pair distribution function analysis. Both CdSe and CdTe are found to exhibit the zinc-blende-type atomic ordering. It is only slightly distorted in CdSe implying the presence of nanosize domains and very heavily distorted in CdTe due to the presence of distinct core-shell regions. The results well demonstrate the great potential of the experimental approach and thus encourage its wider application in quantum dot research.
Pradhan, S. K., Deng, Z. T., Tang, F., Wang, C., Ren, Y., Moeck, P., & Petkov, V. (2007). Three-dimensional structure of CdX (X= Se, Te) nanocrystals by total x-ray diffraction. Journal of Applied Physics, 102(4), 044304.