Cation Exchange Reactions in Ionic Nanocrystals

Cation exchange has been investigated in a wide range of nanocrystals of varying composition, size, and shape. Complete and fully reversible exchange occurs, and the rates of the reactions are much faster than in bulk cation exchange processes. A critical size has been identified below which the shapes of complex nanocrystals evolve toward the equilibrium shape with lowest energy during the exchange reaction. Above the critical size, the anion sublattice remains intact and the basic shapes of the initial nanocrystals are retained throughout the cation exchange. The size-dependent shape change can also be used to infer features of the microscopic mechanism.

[1]  Uri Banin,et al.  Selective Growth of Metal Tips onto Semiconductor Quantum Rods and Tetrapods , 2004, Science.

[2]  M. Hove.  Enhanced vibrations at surfaces with back-bonds nearly parallel to the surface , 2004 .

[3]  Gabor A. Somorjai,et al.  Formation of Hollow Nanocrystals Through the Nanoscale Kirkendall Effect , 2004, Science.

[4]  M. Backhaus-Ricoult.  SOLID-STATE REACTIVITY AT HETEROPHASE INTERFACES , 2003 .

[5]  K.-S. Cho,et al.  Three-dimensional binary superlattices of magnetic nanocrystals and semiconductor quantum dots , 2003, Nature.

[6]  Liberato Manna,et al.  Controlled growth of tetrapod-branched inorganic nanocrystals , 2003, Nature materials.

[7]  D. Gosset,et al.  Neutron diffraction study of the size-induced tetragonal to monoclinic phase transition in zirconia nanocrystals. , 2003, Physical review letters.

[8]  R. Könenkamp,et al.  Nanostructure Transfer in Semiconductors by Ion Exchange , 2003 .

[9]  Younan Xia,et al.  Shape-Controlled Synthesis of Gold and Silver Nanoparticles , 2002, Science.

[10]  Gregory V. Hartland,et al.  Heat Dissipation for Au Particles in Aqueous Solution: Relaxation Time versus Size , 2002 .

[11]  A. P. Alivisatos,et al.  Epitaxial growth and photochemical annealing of graded CdS/ZnS shells on colloidal CdSe nanorods. , 2002, Journal of the American Chemical Society.

[12]  T. Mallouk,et al.  Perovskites by Design: A Toolbox of Solid-State Reactions , 2002 .

[13]  C. Mirkin,et al.  Photoinduced Conversion of Silver Nanospheres to Nanoprisms , 2001, Science.

[14]  Catherine J. Murphy,et al.  Wet Chemical Synthesis of High Aspect Ratio Cylindrical Gold Nanorods , 2001 .

[15]  W. Howells,et al.  Ag+ dynamics in the superionic and liquid phases of Ag2Se and Ag2Te by coherent quasi-elastic neutron scattering , 2001 .

[16]  S. Feng,et al.  New materials in hydrothermal synthesis. , 2001, Accounts of chemical research.

[17]  Weidong Yang,et al.  Shape control of CdSe nanocrystals , 2000, Nature.

[18]  Chen,et al.  Size Dependence of Structural Metastability in Semiconductor Nanocrystals , 1997, Science.

[19]  H. Weller,et al.  Preparation, characterization, and photophysics of the quantum dot quantum well system cadmium sulfide/mercury sulfide/cadmium sulfide , 1994 .

[20]  M. Bawendi,et al.  Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites , 1993 .

[21]  A. Alivisatos,et al.  Melting in Semiconductor Nanocrystals , 1992, Science.

[22]  Michisuke Kobayashi,et al.  Review on structural and dynamical properties of silver chalcogenides , 1990 .

[23]  John Burgess,et al.  Metal Ions in Solution , 1978 .

[24]  A. Maradudin,et al.  Some Dynamical Properties of Surface Atoms , 1964 .