期刊：
Journal of Solid State Chemistry,2006年179(3):843-848 ISSN：0022-4596
通讯作者：
Huang, XT
作者机构：
[Huang, XT; Liu, JP] Cent China Normal Univ, Dept Phys, Ctr Nanosci & Technol, Wuhan 430079, Peoples R China.;[Huang, XT] Cent China Normal Univ, Dept Phys, Ctr Nanosci & Technol, 152-7 Luo Yu Rd, Wuhan 430079, Peoples R China.
通讯机构：
[Huang, XT] C;Cent China Normal Univ, Dept Phys, Ctr Nanosci & Technol, 152-7 Luo Yu Rd, Wuhan 430079, Peoples R China.
关键词：
crystal morphology;photoluminescence;growth from solutions;OPTICAL-PROPERTIES;OXIDE NANOSTRUCTURES;HYDROTHERMAL PROCESS;DEPOSITION METHOD;NANOWIRES;GROWTH;FABRICATION;MICROTUBES;NANORODS;ROUTE
摘要：
We have successfully synthesized single-crystal ZnO nanotubes and tubular whiskers by employing Zn(NO3)(2) center dot 6H(2)O, NH3 center dot H2O as the starting materials in the presence of polyethylene glycol (PEG, M-w = 2000) at ambient pressure and low temperature (70 degrees C). Characterizations are carried out by X-ray powder diffraction (XRD), X-ray energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM, HRTEM) and photoluminescence (PL) measurement, The results show that the as-prepared ZnO are tubular textures, which have average cross-sectional dimensions of 200-300 nm, lengths of 2-3.5 mu m, and wall thickness of 80 nm. These tubular products demonstrate a sharp ultraviolet excitonic emission peak centered at 385 nm at room temperature. A possible growth mechanism and the influence of the reaction temperature on the formation of crystalline ZnO are presented. (C) 2005 Elsevier Inc. All rights reserved.
作者机构：
[Ding, XX; Huang, ZX; Gan, ZW; Tang, C; Huang, XT; Cheng, C; Qi, SR] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Gan, ZW] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
Oxide;Silicon;Thin Film;SiO2;Boron
摘要：
A novel method was demonstrated to fabricate boron nitride nanotube films on silicon substrate in a location-controlled fashion. The pre-deposited SiO2 layer on the substrate controls the growth space of BN nanotubes synthesized by an ammonothermal reaction of boron and its oxide.
作者机构：
[Huang, XT] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Chinese Acad Sci, Wuhan Inst Phys & Math, Wuhan 430071, Peoples R China.
通讯机构：
[Huang, XT] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
电阻测量;碳纳米管;临界值;电子循环分布;薄膜物理学
摘要：
Aiming at the difficulty in the electrical resistance measurement, we develop a simple statistical model for the carbon nanotubes adequately dispersed in available insulated liquid and introduce the concept of ``the most probability''. Based on this model, we obtain the function between macroscopic resistance R and resistance of an individual nanotube, R0, from which one can calculate the resistance of an individual nanotube by measuring the macroscopic resistance. By computational simulation, we prove the reliability of the model. Then, we analyse the feasibility of the model when applied to experiment.
作者机构：
[Lu, HF] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China.
通讯机构：
[Lu, HF] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
noise;Fokker–Planck equation;SQUID;shunted
摘要：
An analytical expression for the stationary probability distribution of the DC superconducting quantum interference device (SQUID) with a resistively shunted inductance driven by thermal noise is derived from the two-dimensional Fokker–Planck equation. The effects on the SQUID characteristics subject to a large thermal fluctuation with a noise parameter Γ>0.20 are discussed by taking into account the thermal noise in the accuracy of numerical simulation. This theory is valid for a reduced inductance β≤1. The analytical formulae for the SQUID characteristics, e.g. the circulating current, the average voltage and the voltage modulation, are obtained and discussed. The theory shows that the voltage modulation increases with the shunted inductance more efficiently for a large inductance parameter β and small fluctuation parameter Γ.
作者机构：
[Duan, JX; Tu, PH; Huang, XT; Liu, JP; Ai, HH] Cent China Normal Univ, Dept Phys, Ctr Nanosci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Huang, XT] C;Cent China Normal Univ, Dept Phys, Ctr Nanosci & Technol, Wuhan 430079, Peoples R China.
关键词：
Crystal morphology;Growth from solutions;Semiconducting II-VI materials;ZnO
摘要：
A convenient wet chemical method has been developed to synthesize flower-like ZnO micron-size structures composed of whiskers in large quantities at 60 °C for 24 h, employing Zn(NO3)2·6H2O, NH3·H2O as the starting materials in the presence of polyethylene glycol (PEG) and CS2. XRD result proves the formation of ZnO with wurtzite structure. Selected area electron diffraction (SAED) patterns confirm that the product is single crystal nature. The observations from SEM and TEM reveal that two kinds of products with diameter of micron size, having spheral symmetry and circumferential symmetry, are produced. The possible growth mechanism of the assembled architecture is proposed. It is found that PEG and CS2 play important roles in the morphological and structural control of ZnO microncrystallites.
摘要：
An analysis expression for the stationary probability distribution of asymmetric superconducting quantum interference device with two Josephson junctions (dc SQUID) driven by thermal noise is derived from two-dimensional Fokker-Planck equation, where the potential condition is satisfied. Two of the three asymmetric parameters, inductance asymmetric parameter η and critical current asymmetric parameter a, can be changed in this condition, but resistance asymmetric parameter ρ cannot be changed. The "ripple" phenomenon of circulating current can disappear with the change of coefficient α. The effects of asymmetric parameters on current-voltage relationship and transfer function of dc SQUID system are also represented.
