A native interfacial doping layer introduced in core-shell type ZnO nanowires by a simple vapor phase re-growth procedure endows the produced nanowires with both excellent electrical and optical performances compared to conventional homogeneous ZnO nanowires. The unique Zn-rich interfacial structure in the core-shell nanowires plays a crucial role in the outstanding performances.

Huaiyi Ding;Nan Pan;Chao Ma;Yukun Wu;Junwen Li;Hongbing Cai;Kun Zhang;Guanghui Zhang;Wenzhen Ren;Jianqi Li;Yi Luo;Xiaoping Wang;建国 侯

Advanced Materials

2014-5-21

The electrical and structural properties of C₆₀/Sb bilayers were investigated. In situ direct-current conductivity measurement results indicate that the doping of Sb into C₆₀ induces the C₆₀ order-disorder phase transition temperature to increase to ∼278 K. According to the results of a transmission electron microscope and atomic force microscope study, such a transition (near 278 K) implies the formation of an interfacial structure of Sb-doped C₆₀. Annealing and the absorption of gases destroy the interfacial structure of Sb-doped C₆₀. A possible mechanism for such a phase transition is discussed.

Xiang Li;H. Wang;W. N. Wang;Y. J. Tang;H. W. Zhao;文山 詹;建国 侯

Journal of Physics Condensed Matter

2001-5-7

The elastic response (Young's modulus and internal friction) of solid C60 has been measured in single-crystal specimens as a function of temperature. We determine a Debye temperature of ∼100 K and a room-temperature Young's modulus of 2.0±0.5×1011 dyn/cm2. The elastic properties are strongly anharmonic and indicate phase transitions at ∼150 and ∼269 K.

S. Hoen;N. G. Chopra;X. D. Xiang;R. Mostovoy;建国 侯;W. A. Vareka;A. Zettl

Physical Review B

1992

We have computed the conductance of a side-contacted metallic carbon nanotube(CNT) with one end dangling outside a probe by using a tight-binding model. We have also demonstrated that the average conductance of a CNT with a finite dangling end is about twice as that of CNT with an infinite dangling end. When the contact between a side probe and a CNT is monoatomic, the conductance strongly depends on the length of the dangling end. Quasilocalized states at the dangling end can cause antiresonances, affecting transmission probability when a probe is near the end.

Tongcang Li;Q. W. Shi;Xiaoping Wang;Qin Chen;建国 侯;Jie Chen

Physical Review B - Condensed Matter and Materials Physics

2005-7-15

The high-temperature resisitivity of K and Rb-doped C₆₀ single crystals was measured with pulsed heating techniques and analyzed within the parallel-resistor extension to Bloch-Boltzmann transport theory. Rb₃C₆₀ exhibits resitivity saturation with ρ{variant}_sat^Rb ≈ 6 ± 3mΩ-cm, corresponding to a saturation mean free path of ℓ_sat^Rb ≈ 1 ± 0.5 A ̊. In contrast K₃C₆₀ does not show signs of resistivity saturation up to 800 K, suggesting that ρ{variant}_sat^K > 3mΩ-cm and ℓ_sat^K < 1.5 A ̊. The electronic states at high temperature have a characteristic length scale significantly smaller than the fcc lattice constant.

建国 侯;Li Lu;Vincent H. Crespi;X. D. Xiang;A. Zettl;Marvin L. Cohen

Solid State Communications

1995-3

A highly oriented, well-aligned hierarchical Zn-In-O nanobelt-nanoprism array was synthesized by vapor-phase transport and condensation using GaN epilayer as the substrate. The upper nanobelts are found to be ZnO:In with an average Zn/In molar ratio of approximately 9:1, and the subjacent nanoprisms are found to be In₂O₃(ZnO)_m (m = 2, 3, 4, and 5) structures. During self-assembly, the nanoprisms are vertically grown on GaN and well aligned along the superlattice stacking direction, upon which each nanobelt is horizontally grown along its [10-10] direction. The spatially resolved cathodoluminescence spectra collected on individual hierarchical nanostructures clearly show characteristics for the ZnO:In nanobelt and for the In₂O₃(ZnO)_m nanoprism, which are distinctly different from the emissions of the undoped ZnO nanorod. I-V measurements on individual nanobelts reveal good conductivity over 10³ Sm ^-1 and high electron concentration of 10¹⁹-10²⁰ cm^-3. This bottom-up self-assembled, highly oriented, and well-aligned hierarchical nanoarray may find applications in newly emerging vertically integrated nanoarray circuits.

Nan Pan;Haizhou Xue;Jinhua Huang;Guanghui Zhang;Yukun Wu;Ming Li;Xiaoping Wang;建国 侯

European Journal of Inorganic Chemistry

2010-9

A technique for growth of layered silver nano-crystallites and C₆₀ by vapor co-deposition is reported. It is found that the epitaxial relationship and growth morphology of Ag films on NaCl substrate were significantly affected by co-deposition of small amounts of C₆₀. The temperature of the source of C₆₀ was 350°C, and a layer of Ag nano-crystallites all with (110) orientation was grown on a hot (001) NaCl substrate. Moreover, co-deposition of C₆₀ prevented coalescence of Ag nano-particles into large grains. Thus, granular films were obtained with high density of oriented Ag nano-crystallites with a narrow size distribution.

建国 侯;Yan Wang;Wentao Xu;利 杨;Z. Q. Wu;Y. H. Zhang

Materials Letters

1998-2

We report a direct observation adopting 'face-on' and 'edge-on' stacking styles in monolayer of a novel porphyrin derivative on highly ordered pyrolytic graphite (HOPG) using scanning tunneling microscope (STM). The porphyrin derivative, 5-hydroxyphenyl-10, 15, 20-trikis(4-dodecyloxyphenyl) porphyrinatozinc(II) (ZnDPPOH) is synthesized and assembled on HOPG. In the STM images, we observed two kinds of ordered domains. One consists of ZnDPPOH dimmers, adopting 'face-on' stacking style, the other exhibits a segmented columnar structure, like piled-up 'armchairs', lying down on the substrate, adopting an 'edge-on' stacking style. In the latter case, the conjugated and highly delocalized π-systems play key roles in stabilizing the monolayer.

Yunshen Zhou;Bing Wang;Manzhou Zhu;建国 侯

Chemical Physics Letters

2005-2-14

A Comment on the Letter by E.A. Henriksen et al., Phys. Rev. Lett.PRLTAO0031-9007 104, 067404 (2010)10.1103/PhysRevLett.104.067404. The authors of the Letter offer a Reply.

W. Zhu;Q. W. Shi;建国 侯;X. R. Wang

Physical Review Letters

2010-10-7

By using a piston-cylinder type hydrostatic high-pressure unit, the electrical dc conductance of bulk C₆₀ single crystal was measured in the pressure range of 0 to 0.6 GPa at 290 K. With increasing pressure, a discontinuous increase of the conductance was observed at the pressure of 0.176 GPa, which can be ascribed to the orientational ordering phase transition. In the simple cubic phase, the increase of conductance with increasing pressure is faster than that in the face-centered-cubic phase.

Bin Xie;Haiqian Wang;Qiang Wang;建国 侯;Bo Xu;Mingqiu Tan;Hongnian Li;Yabo Xu

Chinese Science Bulletin

1998-8