To improve the dispersion of graphene oxide (GO) and form effective synergistic effect between GO and WS2 nanosheets, the layer-by-layer electrostatic assembly method was used to synthesize three-dimensional (3D) reduced graphene oxide/WS2 nanosheet/Mg-doped ZnO nanohybrid (rGOWMZ). The enhancement of photocatalytic activity of a reduced graphene oxide/Mg-doped ZnO composites (rGOMZ) was achieved through introducing WS2 nanoplate, in which the decomposition rate of Rhodamine B (RhB) reached 100% within 5 min. Furthermore, the rGOWMZ hybrids possess better anti-bacterial activity in dark than rGOMZ hybrid. The enhanced sunlight-driven photocatalytic and anti-bacterial activities are mainly attributed to defect and efficient electron-hole separation.
[Xiao, Hanning; Wang, Chao; Huang, Yangfeng] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Xiao, Hanning; Chen, Shuguang] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410076, Hunan, Peoples R China.
[Xiao, Hanning] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
CuS hollow spheres have been successfully prepared using styrene-acrylic acid copolymer (PSA) latex particles as template. The process involved the deposition of inorganic coatings on the surface of PSA latex particles and subsequent removal of the latex particles by dispersing in toluene. The synthesized products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and UV-vis absorption spectroscopy. The results showed the wall thickness of CuS shell to be about 20 nm and the pore diameter to be about 150 nm. The possible formation mechanism of CuS hollow spheres has been proposed. (C) 2008 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Tailoring the geometric configuration of anodic TiO2 nanotubes enables their use in various applications. This paper demonstrates that the methods for pretreating electrolyte solutions significantly influence the growth of anodic nanotubes. Pretreatment is usually ignored by studies, but is a crucial and non‐negligible factor in the control of nanotube growth. The results indicate that magnetic stirring and ultrasonic agitation facilitate the dissolution and mass transport of ionic species in the solution, resulting in a homogeneous solution and a high TiO2 nanotube growth rate. Isolation of the solution from wide contact with the atmosphere through simple sealing further increases the growth rate. This is attributed to the hindrance of humidity absorption, which biases the original water content of the solution and thus causes the formation of an initial thick compact oxide layer that prevents ion diffusion. The findings can serve as a guide to electrolyte pretreatment routes for studying nanotube growth mechanisms and for tailoring nanotube features toward different applications.
[Wu, Chun; Jia, Chuankun; Ding, Mei] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Zhu, Ying; Zhang, Kaili] City Univ Hong Kong, Dept Mech & Biomed Engn, 83 Tat Chee Ave, Hong Kong, Hong Kong, Peoples R China.;[Zhu, Ying; Zhang, Kaili] City Univ Hong Kong, Shenzhen Res Inst, Shenzhen 518057, Peoples R China.;[Jia, Chuankun] Nankai Univ, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China.
[Jia, Chuankun] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Zhang, Kaili] City Univ Hong Kong, Dept Mech & Biomed Engn, 83 Tat Chee Ave, Hong Kong, Hong Kong, Peoples R China.
Energy storage;MnO 2 electrode;Plate-like electrode materials;Supercapacitor;Transition metal oxides
In order to improve optical property of the multi-walled carbon nanotubes(MWNTs),MWNTs were decorated with europium oxide(Eu2O3) nanoparticles by using co-deposition method. The MWNTs/Eu2O3 composites were examined by XRD,scanning electron microscopy,transmission electron microscopy,and VUV-Vis Luminescence spectroscopy and citric acid(CA) molecules were introduced onto the surface of MWNTs. The results show that there are many oxygenated functional groups on the surface of the MWNTs after the treatment of mixture acid,such as carboxy,hydroxl,carbony and amidocyanogen. The results of electron microscopy illuminate that the MWNTs are coated by nano-europium oxide after annealed at 750℃. The MWNTs/Eu2O3 composite emits much strong red light at about 610 nm under UV excitation.
Transactions of Nonferrous Metals Society of China,2007年17(A02):667-670 ISSN：1003-6326
[Chen Xiao-hua] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410076, Peoples R China.;[Chen Xiao-hua; Li Wen-hua; Wang Yan-guo; Xu Long-shan; Yang Zhi; Chen Chuan-sheng] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
[Chen Xiao-hua] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410076, Peoples R China.
International Conference of Nonferrous Materials (ICNFM)
NOV 25-30, 2007
Changsha, PEOPLES R CHINA
[Chen Xiao-hua] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410076, Peoples R China.^[Chen Xiao-hua;Li Wen-hua;Yang Zhi;Xu Long-shan;Chen Chuan-sheng;Wang Yan-guo] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
aerosol;carbon nanotubes;aligned morphology
A novel aerosol method for the production of alighed carbon nanotubes was presented. Multi-walled carbon nanotubes(MWNTs) with fairly uniform diameters and aligned MWNT bundles were obtained by using solutions of organometallics such as ferrocene in hydrocarbon solvents. A hollow and multi-walled structure was observed with diameter ranging from 15 to 50 nm,leading aspect ratio to be over 200. The quality of the product is dependent on the pyrolysis temperature,carrier gas flow rate and the catalyst precursor concentration. For the sample synthesized at 900 ℃,G/D is 1.81. G/D of samples obtained at 850 ℃ and 800 ℃ are 1.18 and 0.77,respectively. The inclusion of acetylene to an atomized spray of ferrocene in hexane yield aligned MWNT bundles with a narrow diameter distribution.