The International Society for Optics and Photonics (SPIE) highlights the development of “Ultra-thin membranes of non-layered crystalline solids” by our researchers Prof. Ion Tiginyanu and Dr. Veaceslav Popa.
http://spie.org/x48698.xml?highlight=x2400&ArticleID=x48698
http://spie.org/x2434.xml?highlight=x2400&parentid=x2400&parentname=Nanotechnology
Our paper highlighted on Cover of Physica Status Solidi - Rapid Research Letters
In the Rapid Research Letter on p. 100, Mihai Enachi et al. demonstrate that anodization of Ti sheets in ethylene glycol and HF containing electrolyte leads to the formation of ordered arrays of double-walled TiO2 nanotubes. Interestingly, the inner diameter can be tuned in the range from 10 nm to 250 nm through the change of the electrolyte temperature while the outer nanotube diameter and the density of nanotubes remain temperature independent. The authors present evidence for the formation of a self-organized surface nucleation layer that is genetically connected to the outer nanotube shell at the origin of this phenomenon. These findings pave the way for manufacturing ordered arrays of TiO2 nanotubes with modulated inner diameter by a simple change of the electrolyte temperature.
http://www3.interscience.wiley.com/journal/112716025/home
http://www3.interscience.wiley.com/journal/112716025/home/cover/current.html
A new book on nanotechnologies and nanomaterials was recently published by Woodhead Publishing in UK, with two co-editors Prof. Ion Tiginyanu from Moldova and Prof. Abdel Makhlouf from Germany. Details related to the presentation of the monograph can be found at http://asm.md
On February 27th the Jurnal TV Company has broadcast an interview with Prof. Ion Tiginyanu, vice-president of the Academy of Sciences of Moldova, coordinator of the MOLD-ERA FP7 project, and of the State Programme on Nanotechnologies and Nanomaterials.
http://www.jurnaltv.md/ro/news/nanotehnologii-in-moldova-340206
Researchers in Moldova have fabricated nanometre-thin membranes of gallium nitride for the first time and investigated their nanostructure using electron microscopy. GaN is a large-bandgap semiconductor widely used in electronics applications such as high-temperature, high-power electronics and optoelectronics for light-emitting diodes and lasers. GaN is also biocompatible, piezoelectric and resistant to ionizing radiation, while the nanostructured material could be good for making spintronics devices.
In the Rapid Research Letter on p. 242 ff., titania nanotubes are proposed as building blocks of focusing elements. The design of photonic crystal (PC) - in particular concave - lenses on the basis of metallized nanotubes is found to result in excellent focusing of visible electromagnetic radiation. The lenses prove to be tolerant to disorder in the spatial arrangement of the nanotubes. Moreover, some disorder is even shown to improve the focusing properties.