The national television channel JURNAL TV broadcasted the program "The World in the NANO age" with the participation of prof. Ion Tiginyanu, Vice-President of the Academy of Sciences of Moldova, Dr. Hans L. Hartangel, Professor at the Technical University of Darmstadt, Germany, honorary member of ASM, and Dr. Hidenori Mimura, Professor at the University of Shizuoka in Japan.

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.

Read more: Our paper highlighted by Nanoroof reveals dislocations

Our paper highlighted on Cover of Physica Status Solidi - Rapid Research Letters

pss rrl cover enachi lowIn 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.

Read more: Our paper highlighted on Cover of Physica Status Solidi - Rapid Research Letters

Porous III-V Semiconductors
by I. Tiginyanu, S. Langa, H. Foell and V. Ursachi

Fabrication and optical characterisation of porous structures by ussing electrochemical etching as a nanostructuring technique.

Over the last decade, a great deal of research efforts was focused on manufacturing and studying inorganic nanochannel-array materials attractive for applications in catalysis, separations, environmental-technologies, photonics, micro- and optoelectronics. Considerable progress was achieved in semiconductor nanostructuring using electrochemical etching techniques. This book is devoted to issues related to fabrication and optical characterisation of porous III-V semiconductors fabricated using anodic etching.

Read more: Porous III-V Semiconductors: online book

Our results on cover of international journal "Physica Status Solidi - Rapid Research Letters"

pps2_lowIn 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.

Read more: Focus on negative index materials


A new, simple technique to produce ordered arrays of metal nanotubes has been developed by scientists in Moldova. The method works by electroplating in conductive nanotemplates routinely fabricated by anodic etching of semiconductor substrates in salty water. The result could be important for making plasmonic devices, photonic crystals, catalysts for energy conversion and chemical and biological sensors. 

Read more: Salty water puts metal nanotubes in order