期刊：
2008 2ND IEEE INTERNATIONAL NANOELECTRONICS CONFERENCE, VOLS 1-3,2008年:53-57
通讯作者：
Liu, Jinping
作者机构：
[Huang, Xintang; Liu, Jinping; Li, Yuanyuan] Cent China Normal Univ, Dept Phys, Wuhan 430079, Hunan, Peoples R China.
通讯机构：
[Liu, Jinping] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Hunan, Peoples R China.
摘要：
In this paper, a low-temperature (T=70 degrees C) solution-phase approach has been developed for the fabrication of vertically-aligned ZnO nanoneedle arrays directly on bulk nickel substrate. The synthetic process involving no seeds, no catalysts, and no surfactants can be readily scaled up. The as-grown ZnO arrays are further used for the first time as anode materials for Li-ion batteries operated in the voltage window 0.05-2.5 V. In the preparation of battery electrode, there is no need to transfer the obtained ZnO arrays to a different surface or align them; In addition, no conducting carbon and other additives such as binder are employed. These offer significant advantages with respect to the cost and practicability. Galvanostatic cycling experiments show that our ZnO nanoneedle arrays exhibit considerably improved performance (especially the cycling stability) as compared to the powder of disordered nanoneedles. A first discharge capacity of 1219 mAh/g and a reversible discharge capacity of similar to 495 mAh/g after 10 cycles are observed (current rate: 200 mA/g). In contrast, ZnO film consisting of random nanoneedles has a smaller first discharge capacity (1090 mAh/g) and its reversible capacity fades rapidly even from the second cycle. The electrochemical performance of ZnO nanoneedle arrays can be further tuned by heat treatment of ZnO active materials at Ar atmosphere, which enhances the adhesion of ZnO to nickel substrate. Our results, combined with the fact that ZnO are cheap, easily prepared, and environmentally compatible, make the ZnO nanoneedle arrays a promising anode material for Li-ion batteries.
摘要：
We have synthesized heterostructured ZnO:S/ZnO 6-fold nanorotors through a one-step catalyst-free process during chemical vapor deposition. We performed a series of designed experiments to investigate the effect of growth temperatures, growth time, and the ratios between ZnO and FeS used as starting material on the growth. Optimum conditions where maximum nanorotors were obtained were the following: growth temperatures between the range of 400 and 425 degrees C; growth time 100 min; and a 1: 1 ratio of ZnO + FeS. Each heterostructured nanorotor consisted of a core nanowire with side branches emanating from it. Our studies suggest that the core nanowires were ZnO:S while the nanorods were only ZnO. Furthermore ultraviolet-visible spectroscopy was employed to estimate the excitonic absorption peak of the synthesized nanorotors. The photoluminescence spectrum of the hetrostructured nanorotors showed stronger visible band emission as compared to pure ZnO powder at room temperature. This stronger visible emission in the synthesized nanorotors might be useful as a future UV-excited phosphor for producing bright and broadband visible light.
期刊：
Solid State Sciences,2008年10(11):1568-1576 ISSN：1293-2558
通讯作者：
Liu, Jinping
作者机构：
[Huang, Xintang; Liu, Jinping; Li, Yuanyuan; Chi, Qingbo; Li, Zikun; Li, Guangyun] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;[Huang, Xintang] Hubei Univ, Key Lab Ferroelect & Piezoelect Mat & Devices Hub, Wuhan 430062, Peoples R China.
通讯机构：
[Liu, Jinping] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
Crystal morphology;Growth from solutions;Superhydrophobicity
摘要：
A new hierarchical CuO architecture consisting of densely packed nanoplates and nanoribbons was directly fabricated on Cu foils via a room-temperature solution-immersion process. The architectures resembled cabbages both in the shape and structure, and the plates and ribbons served as the leafstalks and leaves of cabbages, respectively. By carefully monitoring the growth stages, it was found that self-assembled CuO nanoplates could be firstly formed on the Cu foils, and then CuO tiny flexible nanoribbons were grown from the edges of fresh plates. The effect of NaOH concentration on the morphology of CuO structures was discussed. Importantly, stable superhydrophobicity (contact angle CA = 155°), independent of pH value of the water droplets, was successfully observed for CuO microcabbages after modification. The wettability of other CuO micro- and nanoscale hierarchical surface structures fabricated using various NaOH concentrations was also presented. The realization of superhydrophobic bionic surfaces with a new hierarchical morphology of CuO will shed new insights in both the synthesis and application fields.Graphical abstractHierarchical CuO microcabbages, consisting of densely packed nanoplates and nanoribbons and exhibiting superhydrophobic property after modification, were successfully fabricated on Cu foils by a one-step room-temperature solution-immersion route.
摘要：
A novel hybrid material of chitosan/nano-sized SiO<inf>2</inf>/ hydroxyapatite (HAp) composite was prepared through a biomimetic approach. HAp deposited in situ on the surface of chitosan/ nano-sized SiO<inf>2</inf> composite film in simulate body fluid (SBF) solution at 36.5°C. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were performed to study composition and morphological characteristics of the HAp crystal. The results indicated that nano-sized SiO<inf>2</inf> dispersed in the chitosan film provided initial nucleation sites for the growth of the HAp in SBF solution by adsorbing further PO<inf>4</inf><sup>3-</sup>, Ca<sup>2+</sup> due to the induction of HAp formed. The strength of the composite was largely improved because of the addition of nano-sized SiO<inf>2</inf>.
作者：
Sulieman, Kamal Mahir;Huang, Xintang*;Liu, Jinping;Tang, Ming
期刊：
Smart Materials and Structures,2007年16(1):89-92 ISSN：0964-1726
通讯作者：
Huang, Xintang
作者机构：
[Huang, Xintang; Huang, XT; Sulieman, Kamal Mahir; Liu, Jinping; Tang, Ming] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Huang, Xintang] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
摘要：
ZnO/ZnS core–shell nanowires with the wurtzite structure have been grown using a simple catalyst-free thermal evaporation technique. The ZnO/ZnS core–shell nanowires are as long as several tens of micrometers, the thickness of the wires is about 1 µm at the bottom and 50 nm at the top respectively, and the thickness of the core ZnO is about 30 nm near the top of the wires. A high-magnification transmission electron microscope image of a single nanowire reveals a clear ZnO/ZnS interface. The photoluminescence spectrum of the products exhibits two peaks at about 400 and 410 nm respectively.
摘要：
Partially S-doped ZnO symmetric three-sided feather-like nanostructures have been synthesized via a thermal evaporation and transport method. The products were grown in a one-step catalyst-free process. The synthesized nanostructures of both samples have nearly the same morphology although these contain different concentrations of sulfur (1.55 and 10.48 at.%). Our study suggests that the stems were S-doped while the teeth were not. These synthesized nanostructures were single-crystalline wurtzite structures. Room temperature photoluminescence (PL) spectra of the synthesized products showed three PL peaks in the ultraviolet, blue and green emission regions. The peaks were shifted towards high energy by sulfur doping. These symmetric three-sided nanostructures may be used in three-dimensional nanolasers in optoelectronics and nanorotors in nanomechanical systems.
摘要：
Three-side teethed feather-like nanocomb structures of ZnO were produced based on a vapor-phase transport process. ZnS powder was used as source material and Si substrate as a collector, at temperature similar to 1100 degrees C. The morphology of the product showed a ribbon-like stem and nanoteeth array aligned evenly along three sides of the nanoribbon. It was found that the nanoribbon grew mainly along the [0 (11) over bar0] direction, and the self-assembled branching nanoteeth grew epitaxially along the [0001], [000 (1) over bar] and [2 (11) over bar0] orientations. (c) 2006 Elsevier B.V. All rights reserved.
摘要：
A simple aqueous solution route has been successfully employed to prepare large-scale arrays of ZnO nanorods on the zinc foil without the assistance of any template, oxidant or coating of metal oxide layers. It is found that the growth of ZnO nanorod arrays with different densities, diameters and morphologies is dependent on the ammonia concentration and zinc precursor. The different morphologies of the ZnO nanostructures attained with or without adding Zn2+-contained salt in the alkaline solution are compared in the paper. The possible growth mechanism concerning the growth of the different ZnO nanocrystal morphologies is also discussed.
