作者：
Syed Ghazanfar Hussain;Deming Liu;Xintang Huang;Kamal Mahir Sulieman;Sahibzada T. Rasool
期刊：
International Journal of Nanoparticles,2009年2(1-6):443-450 ISSN：1753-2515
通讯作者：
Hussain, S. G.
作者机构：
1. Opto-Electronics Engineering Department, Huazhong University of Science and Technology, Wuhan 430074, P.R. China;Government College Gujranwala 52250 Punjab, Pakistan.;2. Opto-Electronics Engineering Department, Huazhong University of Science and Technology, Wuhan 430074, P.R. China.;3. Department of Physics, Central China Normal University, Wuhan 430079, P.R. China.;4. Physics Department, College of Education, Alzaim Alazhary University, Khartoum Bahry 1432, Sudan.
摘要：
We have reported the synthesis of porous particles of ZnO by thermal evaporation and transport method on silicon (111) substrates. The products were grown in a single-step catalyst-free process. In order to establish the optimum conditions for the preparation of ZnO porous particles, we performed synthetic studies on various growth temperatures. The morphological, structural and optical properties of the synthesised ZnO particles were characterised by field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) and room temperature photoluminescence (RTPL) using a xenon lamp with an excitation wavelength of 325 nm. The photoluminescence spectrum of the sample-I showed stronger visible band emission as compared to others at room temperature. This stronger visible emission in the synthesised porous nanoparticles might be useful as a future UV-excited phosphor for producing bright and broad band visible-light. The change in growth temperature altered the morphological and optical characteristics of the nano- and microspheres.
摘要：
We report here the direct electron transfer of GOD and a novel glucose biosensor based on carbon-decorated ZnO(C-ZnO) nanowire array electrode. The C-ZnO nanowire array provides a novel platform for fast direct electrochemistry of GOD, and its based biosensor shows very high sensitivity and low detection limit. Based on the direct electrochemistry of horseradish peroxidase (HRP), the H2O2 biosensing application is further demonstrated using this new C-ZnO array architecture. The high conductivity of carbon and good electron transfer capability of ZnO nanowires, along with their low cost and biocompatibility make the C-ZnO nanowire array a promising platform for direct electrochemistry of enzymes and mediator-free enzymatic biosensors. (C) 2008 Published by Elsevier B.V.
期刊：
2008 2ND IEEE INTERNATIONAL NANOELECTRONICS CONFERENCE, VOLS 1-3,2008年:377-381
通讯作者：
Li, Yuanyuan
作者机构：
[Huang, Xintang; Li, Yuanyuan; Liu, Jinping] Cent China Normal Univ, Dept Phys, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Li, Yuanyuan] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Hubei, Peoples R China.
摘要：
Bismuth Tungstate (Bi2WO6) that was prepared by solid-state reaction at high temperature in previous work showed catalytic activity in the degradation of organic compound under visible light Irradiation. During the past three years, some reports on the fabrication of Bi2WO6 nano-/microstructures in solution and their use as visible-light photocatalysts have emerged. Despite much progress In this exciting field, no report has discussed the repeating usage of this material to degrade organic compounds, partially due to the lack of well-defined Bi2WO6 structures. In this article, red-cell-like Bi2WO6 hierarchical architectures consisting of a number of square nanoplates of average similar to 30 nm in side length have been firstly synthesized by a hydrothermal method at 180 degrees C for 12 h. These as-prepared microstructures have biconcave configurations with typical sizes of 1.8-2.5 pro, uniform and monodisperse. TEM examination indicates that the single-crystal subunit nanoplates with (001) as their two-dimensional (2D) surfaces assemble orderly using both their edges and faces. The good photocatalytic activity in the degradation of rhodamine B under visible light irradiation (lambda > 400 nm) Is also discussed. Furthermore, we show that these architectures can serve as effective and convenient recyclable photocatalysts, which is crucial to Industrial applications. Only a slight decrease In the photodecomposition rate is observed after 5 cycles of the photocatalysis experiment. All these results demonstrate that the red-cell-like Bi2WO6 hierarchical architectures are promising visible-light-driven photocatalysts and have many potential applications in environmental protection.
期刊：
Journal of Alloys and Compounds,2008年465(1-2):L14-L19 ISSN：0925-8388
通讯作者：
Li, Fei
作者机构：
[Li, Fei] China Univ Geosci, Sch Chem Engn & Mat Sci, Fac Chem Engn & Mat Sci, Wuhan 430074, Peoples R China.;[Huang, Xintang; Li, Fei] Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;[Li, Fei] China Univ Geosci, Sch Chem Engn & Mat Sci, Fac Chem Engn & Mat Sci, 388 Lumo Rd, Wuhan 430074, Peoples R China.
通讯机构：
[Li, Fei] C;China Univ Geosci, Sch Chem Engn & Mat Sci, Fac Chem Engn & Mat Sci, 388 Lumo Rd, Wuhan 430074, Peoples R China.
关键词：
Hydrothermal approaches;Surfactant;Zinc oxide;Micro and nanostructures;Photoluminescence
摘要：
Hydrothermal approaches from aqueous solution using CTAB as surfactant to fabricate micro and nanostructure of zinc oxide was presented. ZnO micro and nanostructures, synthesized under a certain PH value at various temperature, were characterized by techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The characterization results indicated that the ZnO micro and nanostructures prepared at the temperature of 120, 150 and 180 °C were crystalline with the hexagonal wurtzite structure and exhibited different morphology, such as flower-like and cabbage-like structures. Photoluminescence (PL) spectra showed that all products had similar emission features. The influence of temperature on PL spectra was mainly embodied in intensity. In addition, the growth mechanisms of these ZnO micro and nanostructures at different temperature by CTAB-assisted hydrothermal growth were preliminarily discussed.
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.
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>.
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：
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.
