BrainMap

Valentin Serban Teodorescu

Prof.Dr

Experienced Researcher 1-st degree - INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Researcher

Web of Science ResearcherID: B-7577-2011

Curriculum Vitae (12/05/2020)

Expertise & keywords

Atomically resolved structure and interface related phenomena in nano-scale modulated smart materials Call name: Exploratory Research Projects - PCE-2012 call
PN-II-ID-PCE-2012-4-0362 2013 - 2016

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.infim.ro/projects/atomically-resolved-structure-and-interface-related-phenomena-nano-scale-modulated-smart

Abstract:

Physical properties of advanced materials like artificial multiferroics, multilayered structures of semiconductors, shape memory alloys (SMA) result from the interaction between the micro- or nano-scale components (crystal grains, thin films), involving interface processes. The importance of the interface phenomena and of the associated structural defects increases with the size reduction of the involved crystal grains or thin layers. Getting accurate structural information at and near the interface between the nanoscaled components (atomic structure of the interface, associated extended defects, strain fields) becomes mandatory in understanding and designing the physical properties of new materials. Advanced techniques of analytical electron microscopy along with consecrated structural and thermal analysis techniques using state-of-the-art equipments will be mainly employed for thorough microstructural investigations on two classes of materials for which interface phenomena play a crucial role: i. artificial multiferroics and ii. shape memory alloys.

The project specific objectives are:

1. Atomic structure of interfaces and structural defects in artificial multiferroics.

2. Strain field and composition mapping at atomic scale around interfaces and structural defects in artificial multiferroics.

3. Correlation between structural phase transitions and strain fields in nanoscale modulated SMAs.

4. Atomically resolved crystal structure in nanoscale modulated SMAs.

Novel nanostructured semiconductor materials based on Ge nanoparticles in different oxides for aplications in VIS-NIR photodetectors and nonvolatile memory devices Call name: Joint Applied Research Projects - PCCA-2011 call, Type 2
PN-II-PT-PCCA-2011-3.2-1120 2012 - 2016

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE- DEZVOLTARE PENTRU MICROTEHNOLOGIE - IMT BUCURESTI INCD (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU OPTOELECTRONICA INOE 2000 INCD (RO); INTERNET S.R.L. (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.infim.ro/ro/NODE/3960

Abstract:

The primary aim is to obtain novel nanostructured semiconductor materials based on Ge nanoparticles (nps) with optimized properties to be used in photodetectors for the visible and infrared (VIS-NIR) ranges, and also in nonvolatile (NV) memory devices. This aim will be realized in the following objectives: A) Preparation and characterization of nanostructured films based on Ge nps in SiO2, TiO2, HfO2, with optimized photoconductive and electrical properties; B) Preparation and complex characterization of experimental models for VIS-NIR photodetector and NV memory using the optimized materials; C) Fabrication of VIS-NIR photodetector and NV memory to prove experimentally the concepts of the project and its applications; D) Estimation of the economic impact.

Based on the material research (Phase 1), and on the investigations of structures and experimental models (Phase 2), two prototypes will be fabricated in Phase 3, one for the VIS-NIR photodetector, and one for the NV memory, with corresponding technical specifications. Thus, we will prove that the novel nanostructured materials based on Ge nps obtained in this project are suitable for VIS-NIR photodetectors and NV memory devices. Also, the technical and economical analyses documentation and feasibility studies will be performed (Phase 4).

The two devices will be integrated into a system for event identification and an automated test and measurement system for industrial applications and manufacturing devices will be realized.

The results obtained by achieving the project objectives have a high level of originality and novelty. Therefore, the scientific results will be promoted in 5 papers in peer-reviewed journals, and in 7 communications at prestigious international conferences. The technological results will be the object of 3 patent applications.

Young students will be involved in the project, and this will have a formative effect (Master Dissertations and/or PhD theses).

Microstructural transformations of thin films by pulsed laser irradiation at fluences lower than the ablation threshold Call name: Exploratory Research Projects - PCE-2011 call
PN-II-ID-PCE-2011-3-0268 2011 - 2016

Role in this project: Project coordinator

Coordinating institution: Institutul National de Cercetare Dezvoltare pentru Fizica Materialelor

Project partners: Institutul National de Cercetare Dezvoltare pentru Fizica Materialelor (RO)

Affiliation: Institutul National de Cercetare Dezvoltare pentru Fizica Materialelor (RO)

Project website: http://www.infim.ro/projects/microstructural-transformations-thin-films-pulsed-laser-irradiation-fluences-lower-ablation

Abstract:

The project refers to the microstructural transformations induced on thin films by pulsed laser irradiation at low fluences, lower than the ablation threshold. At microscopic scale, the laser irradiation actions shows some new features which are related to the laser wavelength, especially in the case of coherent laser radiation. The project work is focused on the photomechanical effect of the coherent laser beam on the structure of densified amorphous sol-gel oxide films, on structural phase modifications in mixed thin films and on the behavior of the melted metallic films and microsphere formation under the action of high power laser pulses.The structural studies are performed by conventional and high resolution transmission electron microscopy (TEM), atomic force microscopy (AFM), electron and X ray diffraction.

Sensors based on perovskite complex structures for detection and identification of hazardous substances Call name: Joint Applied Research Projects - PCCA-2011 call, Type 2
PN-II-PT-PCCA-2011-3.2-0859 2012 - 2016

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU METALE NEFEROASE SI RARE - IMNR

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU METALE NEFEROASE SI RARE - IMNR (RO); INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); IPA SA (RO); SITEX 45 SRL (RO); MGM STAR CONSTRUCT S.R.L. (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.imnr.ro/sensgas

Abstract:

Nanocrystalline semiconducting metal oxides with controlled composition are indeed of increasing interest in gas sensing and constitute also a new and exciting subject of fundamental research. Compounds having perovskite structures are among one of the most important classes of ternary oxides. Some composite systems (such as (Ba, Sr) TiO3) retained the attention due to their multisensing properties such as: humidity, thermal and photosensitivity. BST ceramics are good candidates for applications in phased array antennas, capacitors, PTC thermistors, and sensors.

SENSGAS project is aimed to create a new class of precisely nanostructured perovskite materials. The project takes into account that the recent research identified the sensing potential of un-modified and modified BST respectively and significant trends on nanotechnologies and gas-sensing layers to be employed. So far, the combined effects of multiple features and the resulting complexity have been explored at a rather preliminary phenomenological level, and a genuine understanding of the underlying mechanism between the BST surface and the gas is still missing, in particular for H2S, SO2, NH3 gases.

The main challenge of SENSGAS project is to gain the fundamental understanding of the details of the surface gas interactions in operation conditions close to the ones found in day-life science since these affects the sensing properties and then to translate this knowledge to the doped nanostructured BST based multifunctional gas sensor platform - containing a large array of chemically and/or morphologically different sensing elements which can be operated independently and has the potential towards detecting gas types (H2S, SO2 and NH3) at temperatures as near is possible to the ambient temperature in an operating range between 0-100 ppm.

This new gas sensor will be used in monitoring systems e. g. in heavy waters production, chemical industry (chemical and biological agent detection), fillers exploitaion

Structural biotransformations of magnetic nanoparticles in biological environments Call name: Postdoctoral Research Projects - PD-2011 call
PN-II-RU-PD-2011-3-0067 2012 - 2013

Role in this project: Key expert

Coordinating institution: Institutul National de Cercetare-Dezvoltare pentru Fizica Materialelor

Project partners: Institutul National de Cercetare-Dezvoltare pentru Fizica Materialelor (RO)

Affiliation: Institutul National de Cercetare-Dezvoltare pentru Fizica Materialelor (RO)

Project website: http://www.infim.ro/projects/structural-biotransformations-magnetic-nanoparticles-biological-environments

Abstract:

As applications of nanotechnologies for life and health sciences get booming, magnetic nanovectors undergo a considerable development. In order to use them in human patients, it is important to understand their interactions with the targeted regions in the body. For this purposes, structural studies will be carried out through innovative developments based on electron microscopies down to subnanometric resolution.

The biodistribution and biotransformation of the ultrasmall superparamagnetic iron oxide contrast (USPIO) agents in the tissular and cellular environments will be investigated at increasing spatial resolution using different techniques. The preparation of ex vivo samples for transmission electron microscopy (TEM) adaptated from standard protocols will allow acquiring high resolution HR(TEM)images and electron diffraction patterns of crystallized USPIO contrast agents in various organs (liver, spleen) of the mouse. A longitudinal follow-up of USPIO nanoparticles injected in mice for MRI of the atherotic plaque will be made: the results will be interpreted in terms of agglomeration of the particles with a decreasing size depending on time after injection and compared with a model of in vitro degradation in acidic environment proposed to mimick the lysosomal metabolism.

Laser processing of thin nanostructured oxide films for transparent and conventional electronics. Call name:
PN II 11061 (1106/2007) 2007 - 2010

Role in this project: Project coordinator

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website:

Abstract:

Sinthesis methods and mechanisms for crystalline nano-particles with controlled size and shape for applications in bionanotechnologies, sensors, special coverage and catalysis Call name:
CEEX nr 6113/ 12.10.2005 2005 - 2008

Role in this project: Project coordinator

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website:

Abstract:

Structural transformation characteristics of laser irradiation processes on low dimensions materials Call name:
2004 - 2006

Role in this project: Project coordinator

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA ()

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA ()

Project website:

Abstract:

FILE DESCRIPTION	DOCUMENT
List of research grants as project coordinator	Download (12.13 kb) 18/05/2016
List of research grants as partner team leader
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects