Time filter

Source Type

Tao F.,Anhui Polytechnic University | Tao F.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Liu L.,Anhui Polytechnic University | Lu Z.-B.,Anhui Polytechnic University | And 6 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

NdF3 hexagonal nanosheets were successfully synthesized by hydrothermal method by adjusting the ratio of nNd3+/nF-, pH value and chelating agent in the reaction solution under 180℃. The phase, morphology and structure of samples were characterized by X ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The luminescence and upconversion of NdF3 hexagonal nanosheets were characterized at room temperature. Emission spectrum indicates that NdF3 nanosheets show relatively strong infrared light of Nd3+ at 904 nm, 1066 nm and 1330 nm, and the strongest emission peak position is 1066 nm, corresponding to the 4F3/2→4I11/2 transition of Nd3+. Upconversion spectrum shows relatively strong light of NdF3 at 522 nm and 580 nm, and the strongest emission peak is at 580 nm. © 2015, Chinese Ceramic Society. All right reserved.


Zhu G.,Anhui Polytechnic University | Tao F.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Hu C.,Anhui Polytechnic University | Wang Z.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | And 2 more authors.
Advanced Materials Research | Year: 2013

EuF3 nanorods with 400 nm in average diameter and 950 nm in length have been synthesized via a hydrothermal method at low temperature. The phase and shape of the products were characterized by XRD, SEM, HRTEM and SAED. Studies show that the chelating agent EDTA is vital to the morphology of the final product. Under longer UV excitation, the as-prepared EuF3 nanorods emitted the yellow and red light. This method will find its applications in exploring the crystal growth process and provide guidance for the morphology controllable synthesis. © (2013) Trans Tech Publications, Switzerland.


Wang Z.,Anhui Polytechnic University | Wang Z.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Lu Z.,Anhui Polytechnic University | Ruan D.,Anhui Polytechnic University | And 7 more authors.
Applied Surface Science | Year: 2014

Hexagonal NaYF4:Yb3+/Er3+ nanowire arrays were successfully synthesized via a hydrothermal method assisted by AAO template. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED) have been used to study the morphologies and crystal structures of the products. The formation of NaYF4:Yb3+/Er3+ nanowire arrays was investigated in detail, and one possible mechanism was proposed. The hexagonal NaYF4:Yb3+/Er3+ nanowire arrays show characteristic upconversion fluorescence at green(520-570 nm) and red (630-680 nm) corresponding to the 4f-4f transition of Er3+. Compared with the hexagonal NaYF4:Yb3+/Er3+ microprisms, the intensity of the red light is obviously improved due to size-dependent nonradiative relaxation. © 2014 Elsevier B.V. All rights reserved.


Wang Z.-J.,Anhui Polytechnic University | Wang Z.-J.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Tao F.,Anhui Polytechnic University | Tao F.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | And 3 more authors.
Bulletin of Materials Science | Year: 2011

NaEuF4 spindle-like nanocrystals have been synthesized through a simple hydrothermal method. The nanocrystals were well crystallized and exhibited fine morphology, as indicated by X-ray diffraction, transmission electron microscope and selected area electron diffractometer. The luminescence properties of these NaEuF4 products were investigated. © Indian Academy of Sciences.


Tao F.,Anhui Polytechnic University | Tao F.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Hu C.,Anhui Polytechnic University | Wang Z.,Anhui Polytechnic University | And 5 more authors.
Ceramics International | Year: 2013

YF3:Ln (Ln=Sm, Dy, Tb and Pr) nano-/microcrystals with uniform morphology and size have been successfully prepared by a facile, and environmentally friendly hydrothermal method. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) have been used to study the morphologies and crystal structure of the products. The effects of the molar ratio of EDTA to Y3+, and chelator on the crystal growth have been investigated in detail. The time-dependent experiments have been conducted to investigate the morphology evolution process. Based on the results, a possible growth mechanism is proposed. The photoluminescence spectra at room temperature show that the as-prepared YF3:Ln (Ln=Sm, Pr, Tb and Dy) nano-/microcrystals show strong light emissions with different colors coming from different activator ions. It is noticed that morphology and size of the products have great influence on their emission intensity. Interestingly, in the YF3:Sm system, we observed the Sm2+ emission peaks when excited at 323 nm. The results reveal that some of the Sm3+ ions should have been reduced to the divalent state during the hydrothermal process. © 2012 Elsevier Ltd and Techna Group S.r.l.


Tao F.,Anhui Polytechnic University | Tao F.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Ruan D.-C.,Anhui Polytechnic University | Hu C.-R.,Anhui Polytechnic University | And 7 more authors.
Chinese Journal of Inorganic Chemistry | Year: 2014

Hexagonal NaNdF4 nanorods with a regular prism were synthesized under mild conditions by hydrothermal method. X ray diffraction (XRD) study shows that pure hexagonal phase NaNdF4 could be obtained under the current synthetic conditions. Scanning electron microscopy observations indicate that the as-obtained NaNdF4 prismatic nanorods have a length of 550 nm, and the ends of the nanorods are a regular hexagon with a side length of 85 nm. Results also show that the chelating ability of EDTA-Na2 on the rare earth metal ions changes with pH value, thus leading to the change of the nucleation rate, and further affecting the final size and morphology of NaNdF4 nanocrystals. The results from luminescence properties indicate that NaNdF4 Hexagonal prismatic nanorods show characteristic emission of Nd3+(f-f) at 892, 1 058, and 1 342 nm, and the strongest emission peak is at 1 058 nm, corresponding to the 4F3/2→4I11/2 transition of Nd3+. © 2014, Chinese Chemical Society. All rights reserved.


Wang Z.,Anhui Polytechnic University | Wang Z.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Tao F.,Anhui Polytechnic University | Tao F.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | And 5 more authors.
Applied Surface Science | Year: 2011

MnS flower-like hierarchical architectures were self-assembled on the surface of porous alumina membrane (PAM) under hydrothermal condition. The diameter of MnS flower-like hierarchical architectures is about 2-4 μm, which are composed of single-crystal nanowires with width of 70-80 nm. X-ray diffraction and high-resolution transmission electron microscopy analysis demonstrated the nanowire have preferred orientation along [1 1 0] direction. Prolonged reaction time would result in hollow spheres. Studies show that PAM and gas bubbles formed within the nanopores of PAM under hydrothermal condition play an important role in the formation process of MnS flower-like hierarchical architectures. The room-temperature PL spectrum shows a strong emission peak at 420 nm corresponding to the MnS band edge emission. © 2011 Elsevier B.V. All rights reserved.


Tao F.,Anhui Science and Technology University | Tao F.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Yu X.-P.,Anhui Science and Technology University | Wang Z.-J.,Anhui Science and Technology University | And 3 more authors.
Chinese Journal of Inorganic Chemistry | Year: 2010

Flower-like MnS spheres on the surface of MnS nanowire arrays were synthesized via a hydrothermal treatment using anodized aluminum oxide (AAO) as the template. The as-prepared samples were characterized by FESEM, TEM, HRTEM, SAED, and XRD. The results show that MnS flower-like spheres are grown on MnS nanowire arrays. The diameter of the MnS nanowires is 70∼80 nm corresponding to the pore diameter of the AAO template used, and flower-like MnS spheres are consisted of single-crystal nanowire. The number of flower-like MnS spheres increases with the reduction of the pore length of the AAO template. The room-temperature PL spectrum shows a strong emission peak at about 420 nm corresponding to the MnS band edge emission. Furthermore, the growth mechanism for the MnS nanostructure has been proposed. AAO template and the air bladders formed via thiourea decomposition to H2S gas under hydrothermal treatment may play an important role in the formation of MnS flower-like spheres sitting on MnS nanowire arrays.


Tao F.,Anhui Science and Technology University | Tao F.,Anhui Provincial Laboratory of High Performance Nonferrous Metals Material | Pan F.,Anhui Science and Technology University | Wang Z.,Anhui Science and Technology University | And 3 more authors.
CrystEngComm | Year: 2010

NaYF4:Ln3+ (Ln = Eu, Sm, Pr and Yb/Er) hexagonal microprisms have been successfully synthesized using a mild hydrothermal method. Field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) have been employed to investigate the formation of NaYF 4:Ln3+ hexagonal microprisms and a possible growth mechanism was proposed. The down- and up- conversion luminescence of hexagonal NaYF4:Ln3+ (Ln = Eu, Sm, Pr and Yb/Er) microprisms have been characterized. © 2010 The Royal Society of Chemistry.

Loading Anhui Provincial Laboratory of High Performance Nonferrous Metals Material collaborators
Loading Anhui Provincial Laboratory of High Performance Nonferrous Metals Material collaborators