BCMaterials Fortnightly Seminars #30

"Permanent Porosity in a Robust Hybrid Framework Formed by Decavanadate Clusters and Copper(II) Complexes of Macrocyclic Polyamines"

 Jagoba Martin 

(BCMATERIALS)

The crystal engineering of metal−organic hybrid materials with novel extended structures remains an important goal in synthesis and crystal growth. In this sense, the construction of coordination compounds with permanent porosity have attracted important attention due to their potential use in fields like gas storage, separation, and catalysis. In this work, a decavanadate-based porous supramolecular hybrid have been synthetized and characterized, namely, [{Cu(cyclam)}₃(V₁₀O₂₈)₂]·12H₂O (1) (cyclam = 1,4,8,11–tetraazacyclotetradecane). The dehydration process was followed by single-crystal X-ray diffraction and the resulting anhydrous structure 1a proved to be virtually identical to that of the parent 1 which evidenced a MOF-type behaviour for the latter compound. The permanent nature of the porosity of 1 in conjunction with the reversibility of the dehydration–rehydration process could render potential catalytic, sensing or guest-absorption applications for this hybrid compound.

“Fabrication and Study of Static and Dynamic Characteristics of Metal-Ferroelectric-Metal Nanoscale Film Capacitor Structures”

Hovhannes Dashtoyan

(National Polytechnic University of Armenia)

In order to meet the strict requirements of modern information systems materials and structures with new and improved features are needed. In this regard the structures based on ferroelectrics (FEs) have a great potential. Interest in FE thin films has been considerable over the last 20 years, driven by the possibility of using them for non-volatile memory applications and new microelectromechanical systems (MEMS), FE FETs, photosensitive bio-medical sensors, solid-oxide fuel cell (SOFC) electrodes, voltage-tunable capacitors, micro­wave electronic components, Film Bulk Acoustic Wave Resonators [1-3], etc.

We have already investigated methods of fabrication of FE based (Ba_0.25Sr_0.75TiO₃, Ba_0.31Sr_0.69TiO₃, ZnO) nanoscale film capacitor structures [4, 5], their dark and photo J(V), I(V) characteristics, charge transport and conduction mechanisms in FE thin films, etc. in the framework of my PhD thesis.

In the framework of ERASMUS MUNDUS BACKIS grant program at the UPV/EHU it is planned to fabricate diverse FE based thin film capacitor structures (mainly metal-ferroelectric-metal) and develop the efficient technologies of fabrication, experimentally investigate different static and dynamic characteristics of fabricated structures and compare these results with the theory already developed by our research group in the framework of my PhD thesis.