Wang Y.,Shandong Jiaotong University |
Liu H.,State Key Laboratory of Crystal Materials
Advanced Materials Research | Year: 2011
In this paper, the Ti-O-Compound nanobelts from commercial TiO2 (annatase phase) were synthesized via the alkali-hydrothermal process. The as-synthesized nanobelts are sodium titanate, hydrogen titanate and anatase with general formula Na2Ti3O7, H2Ti 3O7 and TiO2, respectively. The nanobelts are characterized by Thermogravimetric/Differential Thermal Analysis (TG/DTA), X-ray Diffraction (XRD), Infrared Spectra (IR) and Scanning Electron Microscope (SEM) apparatuses. The characterization indicates that the nanobelts with typical widths of 50 to 200 nm, thicknesses of 20 to 50 nm, and up to a few millimeters in length. The conversion mechanisms between the layer titanate and anatase of nanobelts have been discussed in this study. © (2011) Trans Tech Publications, Switzerland. Source
Liu T.,State Key Laboratory of Crystal Materials |
Liu P.,State Key Laboratory of Crystal Materials |
Zhang L.,State Key Laboratory of Crystal Materials |
Zhou Y.-F.,State Key Laboratory of Crystal Materials |
And 4 more authors.
Journal of Lightwave Technology | Year: 2014
We report on the fabrication and optical properties of planar and channel waveguides in a CdS crystal using a C ion implantation technique combined with a standard photolithographic technique. The prism-coupling and the end-face coupling methods separately measure the guiding modes and the near-field intensity distribution of the light at 633 and 1539 nm. The refractive index profiles of the planar and channel waveguides are reconstructed at 633 and 1539 nm. The finite difference beam propagation method is used to simulate the guided mode profiles. There is excellent agreement between the measured and simulated modes at 633 and 1539 nm. © 1983-2012 IEEE. Source
Wang Z.,State Key Laboratory of Crystal Materials |
Huang B.,State Key Laboratory of Crystal Materials |
Dai Y.,Shandong University |
Zhang X.,State Key Laboratory of Crystal Materials |
And 5 more authors.
CrystEngComm | Year: 2012
3D hierarchical TiO 2 nanoboxes, enclosed by six ordered arranged TiO 2 nanorod arrays, were prepared via a template-engaged topotactic transformation process from TiOF 2 nanocubes. The lattice matching between TiOF 2 and anatase TiO 2 was regarded as the key for the preferential growth and ordered arrangement of the TiO 2 nanorods. © The Royal Society of Chemistry 2012. Source
A new aerogel nanomaterial that reduces the amount of noble metals, such as platinum or palladium, needed to make fuel cells should reduce the cost of such devices making them more commercially viable according to researchers in the USA and China. The aerogel could also improve efficiency. Chengzhou Zhu, Qiurong Shi, Shaofang Fu, Junhua Song, Dan Du, and Yuehe Lin of the Department of Mechanical and Materials Engineering, at Washington State University, Pullman and Haibing Xia of the State Key Laboratory of Crystal Materials, Shandong University, Jinan, have developed a rapid synthesis of aerogels that avoids the need for noble metals. The materials could find use in hydrogen-powered fuel cells as a novel component of this promising environmentally friendly energy solution for the generation of electricity. Aerogels are solids that are certainly worthy of their colloquial name of solid smoke in that they are 92 percent air by volume. They are powerful insulators and have found applications in diving wet suits, firefighting equipment and protective clothing, windows, in paints and as fuel cell catalysts. In this latter application it is the vast surface area per unit volume and high porosity that make the materials useful as catalytic components. The Washington State team has now created a series of bimetallic aerogels, that combine the relatively inexpensive transition metal copper with the precious noble metal which is needed in a smaller quantity in their aerogels. The team made the bimetallic aerogel system using their one-step, high-temperature reduction method to first create a hydrogel exploiting enhanced gelation kinetics. The hydrogel is, to all intents and purposes, the liquid-filled form of the aerogel. The liquid component can subsequently be removed by careful drying to leave behind the seemingly delicate three-dimensional network of the aerogel. The novel synthesis has reduced the standard manufacturing time of a hydrogel from three days to just six hours. "This will be a great advantage for large scale production," explains WSU's Zhu. The research was undertaken as part of WSU's Grand Challenges, a suite of research initiatives aimed at large societal issues. It is particularly relevant to the challenge of sustainable resources and its theme of energy. "The resultant PdCu aerogel with ultrathin nanowire networks exhibits excellent electrocatalytic performance toward ethanol oxidation, holding promise in fuel-cell applications," the team reports in the journal Advanced Materials [Zhu, et al., Adv. Mater. (2016) DOI: 10.1002/adma.201602546] David Bradley blogs at Sciencebase Science Blog and tweets @sciencebase, he is author of the popular science book "Deceived Wisdom".
Zhang J.,CAS Technical Institute of Physics and Chemistry |
Yu H.,State Key Laboratory of Crystal Materials |
Li Y.,CAS Technical Institute of Physics and Chemistry |
Li Y.,University of Chinese Academy of Sciences |
And 3 more authors.
Optics Letters | Year: 2012
We report efficient, diode-pumped, self-frequency doubling (SFD) in the newly developed laser crystal Nd3+:Na3La 9O3(BO3)8 (Nd:NLBO). More than 730 mW of fundamental output power at 1072 nm was achieved with a slope efficiency of 16.2. With incident pump power of 8 W, 29 mW of green cw laser emission at 536 nm was observed with proper phase matching. This initial performance and the good optical properties of the crystalline host are encouraging for the development of a high power diode-pumped SFD visible light laser source. © 2012 Optical Society of America. Source