作者机构：
[Duan, Jin-Xia; Wang, Hao] Hubei Univ, Fac Phys & Elect Technol, Wuhan 430062, Peoples R China.;[Duan, Jin-Xia; Wang, Hao] Hubei Univ, Key Lab Ferro & Piezoelect Mat & Devices, Wuhan 430062, Peoples R China.;[Huang, Xin-Tang] Cent China Normal Univ, Dept Phys, Wuhan 430070, Peoples R China.
通讯机构：
[Wang, H ] ;Hubei Univ, Fac Phys & Elect Technol, Wuhan 430062, Peoples R China.
会议名称：
6th International Conference on Nanoscience and Technology
会议时间：
JUN 04-06, 2007
会议地点：
Beijing, PEOPLES R CHINA
关键词：
Ellipsoid-like;Autoclave tests and pyrolysis integrated method;Oriented attachment
摘要：
ZnO ellipsoid-like structures assembled by ZnO nanrods were fabricated from common ZnO whiskers by autoclave tests and pyrolysis integrated method. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, and high resolution transmission electron microscopy studies reveal ZnO ellipsoidal structures are single-crystals and formed from direct "oriented attachment" of nanorods. Raman and room temperature photoluminescence spectra are also discussed.
摘要：
Heterostructured ZnO : S/ZnO (S-doped ZnO ribbon with ZnO nanoteeth) nanosaws were synthesized by a one-step catalyst-free process through the chemical vapour transport and condensation method. Optimum selectivity and maximum nanosaw densities are obtained for growth temperatures in the range 400–450 °C. Our study suggests that the ribbons were ZnO : S while the teeth were only ZnO. Nanorods, nanoairplane, nanobelts and smooth surface nanotip-like structures were also obtained in our experiment at different growth temperatures. The photoluminescence spectrum of the nanosaws showed a strong visible emission band compared with undoped ZnO powder at room temperature. This strong visible emission in the hetrostructured nanosaws might be useful as a future UV-excited phosphor for producing bright and broad visible-wavelength light.
摘要：
Aligned ZnO nanotubes were synthesized in the presence of Polyethylene Glycol (PEG 2000) by means of a simple two-step solution-phase procedure. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectrometry (EDS) and photo luminescence (PL) spectrum were used to characterize the structure, morphology and optical property of the sample. The results showed that PEG played a significant role in the formation of ZnO nanotubes. The ZnO crystals were grown in hexagonal hollow tube form with a well faceted end and side surfaces. The diameter of each ZnO nanotubes has some variation from bottom to top. The room-temperature photo luminescence spectrum of the tubes revealed a strong and sharp UV emission band at 390 nm and a weak and broad green emission band at 530 nm. Possible growth mechanism of the ZnO nanotubes is briefly discussed. (c) 2005 Elsevier B.V. All rights reserved.
摘要：
An experimental procedure is presented for synthesis of maize-shaped single-crystal ZnO flowers on a large scale at 60 °C for 24 h. The morphologies, purity, sizes and optical properties of the products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), standard selected area electron diffraction (SAED), Raman, UV–vis absorption and PL spectra. XRD measurement proved the formation of ZnO with wurtzite structure. The results from SEM and TEM revealed that two types of maize cob-based micro-flowers with diameter of 1–2 μm were produced. SAED patterns confirmed that the product was single crystal. UV–vis absorption and PL measurement demonstrated a high quality of the products. The possible growth mechanism is also discussed.
期刊：
Materials Chemistry and Physics,2006年98(2-3):523-527 ISSN：0254-0584
通讯作者：
Huang, Xintang
作者机构：
[Duan, Jinxia; Huang, XT; Liu, Jinping; Ai, Hanhua; Li, Yuanyuan] Cent China Normal Univ, Dept Phys, Ctr Nanosci & Technol, Wuhan 430079, Peoples R China.;[Huang, Xintang] Cent China Normal Univ, Dept Phys, Ctr Nanosci & Technol, 152-7 Luo Yu Rd, Wuhan 430079, Peoples R China.
通讯机构：
[Huang, Xintang] C;Cent China Normal Univ, Dept Phys, Ctr Nanosci & Technol, 152-7 Luo Yu Rd, Wuhan 430079, Peoples R China.
关键词：
Microstructure;Photoluminescence;Zinc oxide
摘要：
We have successfully synthesized self-organized radialized flower-like ZnO micron-crystals by employing Zn(NO3)2·6H2O, NH3·H2O as the starting materials without surfactants, template supporting and structure-directing solvent at a low temperature (60 °C). Characterizations were carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and room temperature photoluminescence (PL) measurements. A possible growth mechanism, the influence of pH value on the formation of crystalline ZnO and the photoluminescence properties of flower-like ZnO are systematically discussed.
摘要：
Three-dimensional (3D) ZnO nanostructures including tubular flowerlike architectures and radial nanorods were synthesized selectively at a low temperature of 60 °C in the presence of polyethylene glycol. The ultraviolet–visible absorption, photoluminescence and photodegradation behaviors of the 3D nanostructures were also studied.
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：
[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.
