TY - JOUR
KW - Transmission electron microscopy
KW - Room temperature
KW - Synthesis
KW - Phase transitions
KW - Nanocrystal
KW - Materials properties
KW - Polarization
KW - Ferroelectric materials
KW - Nanocrystals
KW - Low temperature
KW - Unclassified drug
KW - Article
KW - Chemical structure
KW - Phase transition
KW - Polar phase
KW - Particle Size
KW - Ferroelectric distortion
KW - Germanium telluride
KW - Germanium
KW - Controlled synthesis
KW - Crystalline phase transition
KW - Low temperatures
KW - Monodomains
KW - Multiple polarizations
KW - Nanoscale system
KW - Non-volatile memory application
KW - Phase change process
KW - Polarization domain
KW - Rhombohedral structures
KW - Amorphous materials
KW - Colloid
AU - M.J Polking
AU - H Zheng
AU - Ramamoorthy Ramesh
AU - A Paul Alivisatos
AB - Germanium telluride (GeTe) exhibits interesting materials properties, including a reversible amorphous-to-crystalline phase transition and a room-temperature ferroelectric distortion, and has demonstrated potential for nonvolatile memory applications. Here, a colloidal approach to the synthesis of GeTe nanocrystals over a wide range of sizes is demonstrated. These nanocrystals have size distributions of 10-20% and exist in the rhombohedral structure characteristic of the low-temperature polar phase. The production of nanocrystals of widely varying sizes is facilitated by the use of Ge(II) precursors with different reactivities. A transition from a monodomain state to a state with multiple polarization domains is observed with increasing size, leading to the formation of richly faceted nanostructures. These results provide a starting point for deeper investigation into the size-scaling and fundamental nature of polar-ordering and phase-change processes in nanoscale systems. © 2011 American Chemical Society.
BT - Journal of the American Chemical Society
DO - 10.1021/ja108309s
LA - eng
M1 - 7
N1 - cited By 40
N2 - Germanium telluride (GeTe) exhibits interesting materials properties, including a reversible amorphous-to-crystalline phase transition and a room-temperature ferroelectric distortion, and has demonstrated potential for nonvolatile memory applications. Here, a colloidal approach to the synthesis of GeTe nanocrystals over a wide range of sizes is demonstrated. These nanocrystals have size distributions of 10-20% and exist in the rhombohedral structure characteristic of the low-temperature polar phase. The production of nanocrystals of widely varying sizes is facilitated by the use of Ge(II) precursors with different reactivities. A transition from a monodomain state to a state with multiple polarization domains is observed with increasing size, leading to the formation of richly faceted nanostructures. These results provide a starting point for deeper investigation into the size-scaling and fundamental nature of polar-ordering and phase-change processes in nanoscale systems. © 2011 American Chemical Society.
PY - 2011
SP - 2044
EP - 2047
T2 - Journal of the American Chemical Society
TI - Controlled synthesis and size-dependent polarization domain structure of colloidal germanium telluride nanocrystals
VL - 133
SN - 00027863
ER -