摘要：
Self-assembled Cu2O flowerlike architecture has been synthesized by polyol process with the presence of acetamide. The synthesized flowerlike architecture is composed of the petals assembled by small crystalline with size of 5–6 nm. The growth mechanism is proposed that the dissolution of the small particles in microsphere center and then the recrystallization on the surface of the microspheres with the increase of reaction time results in the formation of the final flowerlike architecture. The novel architecture shows a blue shift of absorption edge compared to Cu2O nanocubes and good photocatalytic activity for the degradation of dye brilliant red X-3B under simulated solar light. Moreover, the flowerlike architecture is more stable than Cu2O nanocubes during photocatalytic process since the photocatalytic activity of the second reused architecture sample is still twice as high as that of the original nanocubes. The Cu2O flowerlike architecture may be a good photocatalyst candidate for wastewater treatment.
摘要：
A new series visible-light driven photocatalysts (CuIn)xCd2(1−x)S2 was successfully synthesized by a simple and facile, low-temperature hydrothermal method. The synthesized materials were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area measurement, X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible spectroscopy (UV–Vis DRS). The results show that the morphology of the photocatalysts changes with the increase of x from 0.01 to 0.3 and their band gap can be correspondingly tuned from 2.37 eV to 2.30 eV. The (CuIn)xCd2(1−x)S2 nanocomposite show highly photocatalytic activities for H2 evolution from aqueous solutions containing sacrificial reagents, SO32− and S2− under visible light. Substantially, (CuIn)0.05Cd1.9S2 with the band gap of 2.36 eV exhibits the highest photocatalytic activity even without a Pt cocatalyst (649.9 μmol/(g h)). Theoretical calculations about electronic property of the (CuIn)xCd2(1−x)S2 indicate that Cu 3d and In 5s5p states should be responsible for the photocatalytic activity. Moreover, the deposition of Pt on the doping sample results in a substantial improvement in H2 evolution than the Pt-loaded pure CdS and the amount of H2 produced (2456 μmol/(g h)) in the Pt-loaded doping system is much higher than that of the latter (40.2 μmol/(g h)). The (CuIn)0.05Cd1.9S2 nanocomposite can keep the activity for a long time due to its stability in the photocatalytic process. Therefore, the doping of CuInS2 not only facilitates the photocatalytic activity of CdS for H2 evolution, but also improves its stability in photocatalytic process.
作者机构：
[Cai, Dong; Ren, Lu; Chuang, Jeffrey H.; Chiles, Thomas C.; Xu, Chenjia; Zhang, Lu] Boston Coll, Dept Biol, Chestnut Hill, MA 02467 USA.;[Lan, Yucheng; Wang, Hengzhi; Naughton, Michael J.; Zhao, Huaizhou; Yu, Ying; Ren, Zhifeng] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA.;[Roberts, Mary F.] Boston Coll, Dept Chem, Chestnut Hill, MA 02467 USA.;[Ren, Lu; Yu, Ying] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
通讯机构：
[Cai, Dong] B;Boston Coll, Dept Biol, Chestnut Hill, MA 02467 USA.
通讯机构：
[Yang, Chang-ping] H;Hubei Univ, Fac Phys & Elect Technol, Wuhan 430062, Peoples R China.
关键词：
A. Manganite;D. EPIR effect
摘要：
Nonlinear and hysteretic current–voltage characteristics and electric-pulse-induced resistance (EPIR) switching effects were found in Nd0.7Sr0.3MnO3 ceramics. For samples measured using the two-wire method, a polarity-dependent, stable and reproducible EPIR effect occurs in the whole temperature range measured. The high and low resistive metastates vary with temperature and seemingly can be destroyed by temperatures larger than 400 K. However, for the same sample measured using the four-wire method, no EPIR effect is observed. The result indicates that the EPIR effect is intensively correlated with the interface between the Ag-electrodes and the bulk of the Nd0.7Sr0.3MnO3 polycrystal.
摘要：
ZnO nanoparticles were successfully coated on the multi-walled carbon nanotubes (MCWNTs) via a sol process using Zn(CH3COO)2·2H2O and treated MWCNTs as raw materials. The as-obtained ZnO–MWCNTs nanocomposites were well characterized using X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and Fourier transform infrared spectral studies. The photoluminescence spectrum of ZnO–MWCNTs nanocomposites in the blue peak shows obvious blue-shift for the blue emission compared with that of pure ZnO nanomaterial. The photocatalytic experiments exhibit that the composite has a higher photocatalytic activity than that of both the ZnO nanoparticles and the mechanical mixture of MWCNTs and ZnO.
期刊：
Materials Research Bulletin,2009年44(9):1834-1841 ISSN：0025-5408
通讯作者：
Yu, Ying
作者机构：
[Zhang, Yong-Gang; Peng, Meng; Ma, Li-Li; Tan, Ming; Yu, Ying] Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Wang, Jian-Bo] Wuhan Univ, Ctr Electron Microscopy, Wuhan 430072, Peoples R China.
通讯机构：
[Yu, Ying] H;Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
关键词：
A. Nanostructures;B. Chemical synthesis;D. Catalytic properties
摘要：
Cu2S nanostructures were fabricated by polyol method and then characterized by X-ray diffractometer, scanning electron microscopy, transmission electron microscopy (TEM) and high resolution TEM. The morphologically different Cu2S nanostructures such as vertically nanorod arrays, nanoflowers assembled by nanorod arrays, nanoparticles and nanowires, can be successfully synthesized under different experimental conditions. The growth mechanism for the different nanostructures is proposed. The photocatalytic activity of the prepared samples was evaluated based on the degradation of organic pollutant, active brilliant red X-3B (X-3B), under visible light. Among the Cu2S nanostructures, self-assembled nanoflowers have the highest photocatalytic activity. In addition, the prepared Cu2S nanostructures are found to be able to decolorize X-3B with iron ions for the formation of Fenton reagent. This study provides a more choice to prepare self-assembled nanostructures for the application of environmental pollution control.
作者：
Yan Li-Li;Wang Yan;Xiong Liang-Bin;Li Jia-Lin;Yip Ho-Yin;...
期刊：
无机化学学报,2009年25(11):1960-1964 ISSN：1001-4861
通讯作者：
Yu Ying
作者机构：
[Yu Ying; Yan Li-Li; Xiong Liang-Bin; Li Jia-Lin; Wang Yan] Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yip Ho-Yin; Wong Po-Keung] Chinese Univ Hong Kong, Dept Biol, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Yu Ying] H;Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
作者机构：
[Yu, Y.] Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Yu, Y.; Rybczynski, J.; Ren, Z. F.; Lan, Y. C.; Paudel, T.; Wang, D. Z.] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA.;[Cimeno, A.; Cai, D.; Chiles, T. C.] Boston Coll, Dept Biol, Chestnut Hill, MA 02467 USA.;[Wagner, D. J.] USN, Hlth Res Ctr, Detachment Environm Hlth Effects, Wright Patterson AFB, OH 45433 USA.;[Qiu, M. Q.] Huazhong Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Yu, Y.] H;Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.
摘要：
Patterned carbon nanotube arrays (PCNTAs) with reduced density and length were developed with polystyrene sphere masked catalyst dots followed by the plasma enhanced chemical vapour deposition method. The nanotubes were then uniformly coated with electropolymerised polypyrrole (PPy). The coating thickness was conformally adjustable. Gold nanoparticles (AuNP) together with glucose oxidase (Gox) were doped into the PPy film on the nanotubes to develop a high-performance PCNTA glucose sensor. The sensitivity of the sensor was improved by the co-existence of Gox and AuNP on the carbon nanotube. Moreover, in contrast to previous reported PCNTA glucose sensors, the design herein utilised the entire surface of nanotubes as active sensing areas in order to maximise the faradic currents. This research outlines a practical avenue to fabricate high-performance PCNTA sensor chips with multiple molecules and functional nano-architectures.
作者机构：
[Zhang, Yong-Gang; Ma, Li-Li; Yu, Kewang Ying; Li, Jia-Lin; Yu, Ying; Tan, Ming] Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Sun, Hai-Zhen] Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China.;[Lin, Yu-Lin] Xiamen Tungsten Co Ltd, Wuhan 361004, Peoples R China.;[Wang, Jian-Bo] Wuhan Univ, Ctr Electron Microscopy, Wuhan 430072, Peoples R China.
通讯机构：
[Ma, Li-Li] H;Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Cadmium sulfide (CdS) nanoparticles dotted on the surface of multiwalled carbon nanotubes (MWCNTs) have been synthesized by the polyol method. The as-prepared materials were characterized by x-ray powder diffraction, transmission electron microscopy, scanning electron microscopy, and Brunauer-Emmett-Teller adsorption analysis. The results indicate that CdS nanoparticles with diameter of 5-8 nm are thickly and uniformly coated on the surface of the MWCNTs. The photodegradation of azo dye using these materials was evaluated by the degradation of Brilliant Red X-3B under visible light. The coated nanotubes show higher photocatalytic activity than both CdS alone and a CdS/activated carbon sample; in addition, there is an optimum content of MWCNTs. The presence of MWCNTs can also hamper the photocorrosion of CdS. The mechanism for the enhancement of MWCNTs on the adsorption and photocatalytic property of CdS is investigated for the first time.
期刊：
2007 7TH IEEE CONFERENCE ON NANOTECHNOLOGY, VOL 1-3,2007年:983-986
通讯作者：
Yu, Ying
作者机构：
[Ren, Lu; Yu, Ying] Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan, Peoples R China.
通讯机构：
[Yu, Ying] H;Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan, Peoples R China.
关键词：
Water splitting;Photocatalyst;Hydrogen;Solar light;Pt deposition
摘要：
We present a new visible-light driven photocatalyst (AgIn)(x)Cd2(1-x)S2 prepared by low-temperature hydrothermal method. Here, (AgIn)(x)Cd2(1-x)S2 with nanostructure shows photocatalytic activities for H-2 evolution from aqueous solutions containing sacrificial reagents, SO32-, and S2- under visible-light irradiation even without any cocatalysts. The morphology and band gap of the photocatalysts are different with x changing from 0.01 to 0.5, and the band gap of (AgIn)(x)Cd2(1-x)S2 can be easily tuned from 2.32-2.08 eV. Importantly, the addition of Ag+ and In3+ ion to CdS can improve the light sensitization of photocatalyst. (AgIn)(0.05)Cd1.9S2 with a 2.29 eV band gap has good photocatalytic activity for H-2 evolution under visible light irradiation even without a Pt cocatalyst (274.5 mu mol g(-1)h(-1)), The photocatalytic activity (1172.3 mu mol g(-1)h(-1)) of the same sample loaded with Pt cocatalyst is much higher than that of Pt-loaded CdS (40.2 mu mol g(-1)h(-1)).
