Title :
Three-dimensional structure of twinned and zigzagged one-dimensional nanostructures using electron tomography
Author :
Kim, Han Sung ; Myung, Yoon ; Cho, Yong Jae ; Jang, Dong Myung ; Jung, Chan Soo ; Ahn, Jae-Pyoung ; Park, Jeunghee
Author_Institution :
Dept. of Chem., Korea Univ., Jochiwon, South Korea
Abstract :
Electron tomography and high-resolution transmission electron microscopy were used to characterize the unique 3-dimensional (3D) structures of twinned Zn3P2 (tetragonal) and InAs (zinc blende) nanowires synthesized by the vapor transport method. The Zn3P2 nanowires adopt a unique superlattice structure that consists of twinned octahedral slice segments having alternating orientations along the axial [111] direction of a pseudocubic unit cell. The apices of the octahedral slice segment are indexed as six equivalent 〈112〉 directions at the [111] zone axis. At each 30 degrees turn, the straight and zigzagged morphologies appear repeatedly at the 〈112〉 and 〈011〉 zone axes, respectively. The 3D structure of the twinned Zn3P2 nanowires is virtually the same as that of the twinned InAs nanowires. In addition, we analyzed the 3D structure of zigzagged CdO (rock salt) nanowires and found that they include hexahedral segments, whose six apices are matched to the 〈011〉 directions, linked along the [111] axial direction. We also analyzed the unique 3D structure of rutile TiO2 (tetragonal) nanobelts; at each 90 degree turn, the straight morphology appears repeatedly, while the inbetween twisted form appears at the [011] zone axis. We suggest that the TiO2 nanobelts consist of twinned octahedral slices whose six apices are indexed by the 〈011〉/〈001〉 directions with the axial [010] direction.
Keywords :
III-V semiconductors; cadmium compounds; indium compounds; nanowires; semiconductor quantum wires; titanium compounds; tomography; transmission electron microscopy; twinning; zinc compounds; <;011>; zone axis; <;112>; zone axis; CdO; InAs; TiO2; Zn3P2; [111] zone axis; axial [111] direction; electron tomography; equivalent <;112>; directions; high-resolution transmission electron microscopy; rutile tetragonal nanobelts; straight morphology; three-dimensional structure; twinned octahedral slice segments; twinned one-dimensional nanostructures; twinned tetragonal nanowires; twinned zinc blende nanowires; zigzagged morphology; zigzagged one-dimensional nanostructures; zigzagged rock salt nanowires;
Conference_Titel :
Nanotechnology (IEEE-NANO), 2010 10th IEEE Conference on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-7033-4
Electronic_ISBN :
1944-9399
DOI :
10.1109/NANO.2010.5697924