Stage I/ Dec. 2011

•         Preliminary study on obtaining and characterization of films based on CdSe (ZnS) and CdS (ZnS) embedded in inorganic host matrix

Stage II/ Dec. 2012

•           Thin films containing CdSe dopant (as powder and quantum dots) embedded in silicophosphate matrix were prepared by the sol-gel method, spin coating technique;

•           It was investigated the influence of the substrate rotation speed (1000 rpm, 2000 rpm and 3000 rpm), annealing temperature (200, 300, 350, 400 and 550 oC ) and the time elapsed since the sol preparation till the deposition moment on the optical (UV-Vis-NIR transmission) and structural characteristics (FTIR phonons and Raman bands) of the semiconductor-doped films;

•         Fluorescence spectra in Uv domain of mono and multilayers based on CdSe-doped SiO2-P2O5 films was investigated by 325 nm Xe lamp excitation and 325 nm He-Cd laser excitation in dependency on dopant concentration, substrate rotation speed, annealing temperature and the time elapsed since the sol preparation till the deposition moment

•           Dissemination of the research results was made by the presentation of some scientific communications in the frame of international events and by articles publication in ISI quoted journals

Scientific events

•       Mihail Elisa, Ileana Cristina Vasiliu, Horatiu Niciu, Raluca Iordanescu, Ionut Feraru, Luminita Ghervase, “Synthesis and characterization of CdSe-doped Li2O-Al2O3-P2O5 glass”, IEEE 12th International Conference on Nanotechnology - IEEE NANO 2012, Birmingham, Great Britain, Programme Conference – Nanomaterials-Nanomaterials-Nanoparticles, Characterization and Applications, Poster P-086

•         R. Iordanescu, I. C. Vasiliu, M. Elisa, I. Feraru, L. Ghervase, “Fluorescence investigation of CdSe-doped SiO2-P2O5 sol-gel films”, 3rd International Conferenceon the Physics of Optical Materials and Devices – ICOM 2012, Belgrad, Abstract Book, pag. 233, ISBN: 978-86-7306-116-0

•        R. Iordanescu, M. Elisa, I. C. Vasiliu, I. Feraru, “Synthesis of CdSe-doped sol-gel silicophosphate films”, 6thMaterials Science and Condensed Matter Physics - MSCMP, Vadu lui Voda, Chisinau, Republica Moldova, lucrarea MSP 1 (Materials and Structure Processing), prezentare poster, p. 77, 2012

 

Working visit

•           The manager of the project, dr. Elisa Mihail performed a working visit at the Institute for Microelectronics and Microsystems, Lecee, Italy, in the period 11.112012-17.11.2012, concerning the optical characterization of CdSe doped silicophosfate films. Thus, in the Optical Spectroscopy Laboratory of the host institute, fluorescence measurements, in the visible range have been carried out using different excitation wavelengths both for films and substrates. Also, fluorescence measurements for bulk phosphate glasses doped with CdSe and CdS were carried out. Regarding the obtained results, a working plan was established, which will be applied in the next period aiming at optimizing fluorescence properties of doped inorganic films, materials used in the temperature sensors field based on luminescence effect.

Articles published

•          I. Feraru, I. C. Vasiliu, R. Iordanescu, M. Elisa, C. Bartha, “Structural characterization of CdSe-doped Sol-Gel silicophosphate films”, accepted for publication in the journal Surf. Eng. Appl. Electrochem., 2013

•         C. R. Iordanescu, I. C. Vasiliu, M Elisa and I D Feraru, “Structural and optical investigations on CdSe-doped SiO2-P2O5 sol-gel films”, accepted for publication in the journal Phys. Scrypta, 2013

•       C. Vasiliu, M. Elisa, H. Niciu, R.Iordanescu, I. Feraru, L. Ghervase, “Synthesis and characterization of CdSe-doped Li2O-Al2O3-P2O5 glass”, 12th IEEE International Conference on Nanotechnology                        (IEEE- NANO), Symposium – Nanomaterials-Nanomaterials-nanoparticles, Characterization and Applications, Proceedings Paper, ISBN: 978-1-4673-2200-3, pp. 183-188, 2012

 

Stage III/ Dec. 2013

•           Silicate films doped with CdSe were obtained by pulsed laser deposition method, modifying the deposition parameters (energy ablation, the pressure in the working chamber, the substrate temperature during     deposition)

•           A structural analysis of deposited films was performed by Raman spectroscopy and microstructure of deposited films by Scanning Electron Microscopy (SEM) and EDS (Energy Disperse Spectroscopy)

•           Surface analysis of PLD CdSe- doped films was performed by Atomic Force Microscopy (AFM) and structural units of the base matrix by Fourier Transform Infrared (FTIR) spectroscopy

•           CdSe quantum dot-doped silicate multilayer films have been prepared by sol-gel method, spin coating technique

•           CdS quantum dot-doped silicate multilayer films have been prepared by sol-gel method, spin coating technique

•           Fluorescence emission in the visible domain of CdS and CdSe-doped silicate sol-gel films have been investigated by UV-Vis excitation

•           Fluorescence measurements in dependency on temperature will be performed on CdS and CdSe-doped silicate sol-gel films

 

Scientific events

•          I. Feraru, C. R. Iordanescu, M. Elisa, I. C. Vasiliu, A. Volceanov, S. Stoleriu, M. Filipescu, “Structural and morphological study of thin films phosphate glasses doped with CdSe deposited by pulsed laser deposition method”, 10th International Conference on Nanosciences & Nanotechnologies (NN13), 9-12 July 2013, Thessaloniki, Greece, Abstract Book, p.238

•          Ionut Feraru, Raluca Iordanescu, Mihail Elisa, Cristina Vasiliu, Adrian Volceanov, Stefania Stoleriu, “CdSe -doped phosphate glassy films obtained by PLD on silicon wafers”, 6th International Conference Amorphous and Nanostructured Chalcogenides, Abstract Book, pp. 26, Brasov, 2013

•           I. Feraru, R. Iordanescu, M. Elisa, M. Lomascolo, A. Creti, I. C. Vasiliu, I. Ionita, L. Ghervase, “Fluorescence of silicophosphate films containing CdSe quantum dots”,17th International Sol-Gel Conference, Madrid, Spain, 25.08.2013-30.08.2013, Conference programme, P-B-24, p.21

•           R. Iordanescu, I. Feraru, S. Peretz, M. Elisa, I. C. Vasiliu, R. D. Trusca, E. Vasile, “CdS/ZnS-doped silicate films prepared by sol-gel method”, European Workshop Polymer Science At Nanoscale-PolSci Nano, 22-23 October,Iasi, Romania, 2013

 

 Articles published

•           I. Feraru, R. Iordanescu, M. Elisa, C. Vasiliu, A. Volceanov, S. Stoleriu, A. Peretz, M. Filipescu, “CdSe -doped phosphate glassy films obtained by PLD on silicon substrate”, Chalcogenide Letters, 10 (11), pp. 509-517, 2013

•           C. R. Iordanescu, I. C. Vasiliu, M Elisa and I. Feraru, “Structural and optical investigations on CdSe-doped SiO2-P2O5 sol-gel films”, Phys. Scrypta, T157, 014015 (5pp), doi:10.1088/0031-8949/2013/T157/014015, 2013

•           I. Feraru, I. C. Vasiliu, R. Iordanescu, M. Elisa, C. Bartha, “Structural characterization of CdSe-doped Sol-Gel silicophosphate films”, lucrare acceptata la publicare in revista Surf. Eng. Appl. Electrochem., vol. 6, 2013 (Электронная обработка материалов, 2013, 49 (6), pp. 50-56

Stage IV/2014

•           Two precursor solutions were prepared: a) silicophosphate solution in ethanol, containing CdS/ZnS doping colloidal component; b) silicophosphate solution containing CdS prepared in situ, by chemical synthesis

•           Thin films were deposited from those two solutions, by sol-gel method, spin-coating technique, followed by annealing of the films in order to promote the nucleation and crystallization of the doping component

•           The films were optical characterized (UV-Vis and fluorescence spectroscopy), structural characterized (FTIR and Raman spectroscopy) and morphological characterized (SEM-EDAX and AFM)

•           UV-Vis and fluorescence spectroscopy put in evidence the presence of the doping compound, CdS/ZnS, having fluorescent emission in the visible domain, important characteristic for the next research activities related to the influence of the temperature over the luminescence features of the doped films

•           FTIR and Raman spectroscopy evidenced specific vibration modes of the phosphate matrix, where  P2O5 is the vitreous network

•           SEM-EDAX si AFM investigations revealed both the complex morphology of the deposited films and the presence of the semiconductor crytalline particles

•           The research results were disseminted by ellaboration of scientific communications in the frame of the international events and by publication in ISI quoted scientific journals

Scientific events

•           Cristina Vasiliu, Andreea Matei, Mihai Elisa, Raluca Iordanescu, Ionut Feraru, Ana Emandi, Iulian Ionita, Nano organic compounds embedded in silicophosphate thin films for nano electronics, 3rd International Conference on Competitive Materials and Technology Processes, IC-CMTP3, Miskolc Lillafured, Hungary, 2014, Book of Abstracts, Session 5, Glasses, Coatings and Related Materials, pag. 97, ISBN 978-963-12-0334-9

•           C. Vasiliu, I. Ionita, A. Matei, M. Elisa, R. Iordanescu, I. Feraru, A. Emandi, “Silicophosphate films doped with pyrazolone derivative for nonlinear optics”, 7th International Conference on Materials Science and Condensed Matter Physics-MSCMP 2014,  Vadu lui Voda, Rep. of Moldova, 2014, comm. DSCM 14P

•           Feraru, I. C. Vasiliu, R. Iordanescu, M. Elisa, S. Stoleriu, “Structural and morfological characterization of CdS-doped glass”, 7th International Conference on Materials |Science and Condensed Matter Physics-MSCMP 2014, Vadu lui Voda, Rep. of Moldova, 2014, communication, poster DSCM 15 P

•        Ionut D. Feraru, Raluca C. Iordanescu, Mihai Elisa, Cristina Vasiliu, Stefania Stoleriu, Adrian Volceanov,  Mihaela Filipescu, Alexandru Peretz, "Characterization of CdS-doped glass films obtained by pulsed laser deposition method (PLD)", XII International Conference on Nanostructured Materials (NANO2014), Program Book, Poster Session pp. 02.019

•         M. Elisa, I. C. Vasiliu, I. Feraru, R. Iordanescu, R. D. Trusca, E. Vasile, “CdSe/ZnS-doped silicate and silicophosphate films prepared by sol-gel method”, EMRS-2014, Spring Meeting, Symposium I - Solution processing and properties of functional oxide thin films and nanostructures Poster IP3.31, pag. I-29

•          C. Vasiliu, I. Ionita, A. Matei, M. Elisa, R. Iordanescu, I. Feraru, A. Emandi, “Silicophosphate films doped with organic compounds for nonlinear optical applications”,  EMRS-2014, Spring Meeting, Symposium I-Solution processing and properties of functional oxide thin films and nanostructures, Poster IP2.27, pag. I-17

 

Articles published

•           M. Elisa, I. C. Vasiliu, I. Feraru, R. Iordanescu, M. Rusu, R. D. Trusca, E. Vasile , S. Peretz, “CdSe/ZnS-doped silicophosphate films prepared by sol-gel method”, accepted with revision at J. Sol Gel Sci. Techn., 2014

•           I. C. Vasiliu, I. Ionita, A. Matei, M. Elisa, R. Iordanescu, I. Feraru & A. Emandi, “Silicophosphate films doped with organic compounds for nonlinear optical applications”, J. Sol-Gel Sci. Techn., DOI 10.1007/s10971-014-3540-0, 2014

 

Stage V/2015

• The non-conventional wet route followed by melt quenching method were applied tosynthesize CdS-doped borosilicate glass target for Pulsed Laser Deposition technique;
• CdS-doped borosilicate films were deposited by PLD technique;
• Borosilicate bulk glass target was analyzed by  X-Ray Fluorescence (XRF) spectroscopy and PLD films were characterized by optical absorption spectroscopy in the UV-Vis domain, fluorescence spectroscopy, optical absorption spectroscopy in IR domain with Fourier Transform (FTIR), Raman spectroscopy, Scanning Electron Microscopy (SEM) combined with Energy Dispersive X-Ray analysis (EDX), Atomic Force Microscopy (AFM); the thickness of the films was measured by profilometry method; the band gap value of CdS dopant particles was determined by graphical method and the average size of CdS particles was calculated;
• Glass targets prepared from un-doped phosphate glass and CdS powder were prepared by mixing, pressing and annealing in inert atmosphere;
• Vitreous phosphate films containing CdS were prepared by PLD technique and the characterization was done by FTIR, Raman, fluorescence spectroscopy and AFM analysis;
• Thin films prepared from CdSe 99.99% purity targets by PLD technique were characterized by ellipsometry (absorption coefficient), Raman and fluorescence spectroscopy;
• Thin films from two targets (combinatorial method) using an un-doped glass target and a CdSe 99.99 % purity target were prepared;
• CdSe-doped vitreous thin films prepared by PLD combinatorial method werecharacterized by FTIR spectroscopy and AFM analysis.

 Scientific Events

• M. Elisa, I. D. Feraru, I. C. Vasiliu, R. Iordanescu, M. I. Rusu, R. Trusca, A. Moldovan, S. Peretz, Optical, structural and morphological characterization of CdS-doped sol-gel silico-phosphate films “, IEEE Nano 2015, Rome, Italy, Program-Conference Digest, CP1 section, Poster P69, pag. 69.IEEE Catalog Number CFP15NAN-ART, ISBN: 978-1-4673-8156-7 
• I. Feraru, M. Elisa, I. C. Vasiliu, R. Iordanescu, M. Rusu, R. D. Trusca, S. Peretz, “CdS-doped silicophosphate films prepared by sol-gel synthesis”, EMRS 2015, Symposium I, Poster  IP3.31, fila I-29, Lille, France
• I. C. Vasiliu, I. Ionita, A. Matei , M.Elisa, R. Iordanescu, I. Feraru, A. Emandi, Silicophosphate films doped with organic compounds for nonlinear EMRS 2015,  Symposium I, Poster IP2.27, fila I-17, Lille, France

 Published Articles

• M. Elisa, I. C. Vasiliu, I. Feraru, R. Iordanescu, M. Rusu, R. D. Trusca, E. Vasile, S. Peretz, “CdSe/ZnS-doped silicophosphate films prepared by sol-gel method”, J. Sol-Gel Sci. Techn., 73 (3), pp. 660-665, 2015,  DOI 10.1007/s10971-015-3616-5 
• C. Vasiliu, I. Ionita, A. Matei, M. Elisa, R. Iordanescu, I. Feraru & A. Emandi, “Silicophosphate films doped with organic compounds for nonlinear optical applications”, J. Sol-Gel Sci. Techn., 73 (3), pp. 586-590, 2015,  DOI 10.1007/s10971-014-3540-0

 Articles submitted to be published

• D Feraru, M. Elisa, I. C. Vasiliu, R. Iordanescu, M. I. Rusu, R. D. Trusca, S. Peretz, “CdS/ZnS-doped silico-phosphate films prepared by sol-gel synthesis”, submitted to Phys. Status. Solidi, 2015
• Ionut Daniel Feraru, Mihail Elisa, Raluca Iordanescu, Ileana Cristina Vasiliu, M. I. Rusu, George Epurescu, Monica Enculescu, Sandu Peretz, Regina C. C. Monteiro, L. Constantin, “Characterization of CdS-Doped Glass Films Obtained by Pulsed Laser Deposition (PLD)”,submitted to Surf. Coatings Techn., 2015

 

Stage VI/2016

• Optimization of the preparation parameters in the case of silicophosphate sol-gel films doped by CdS colloidal;
• Optical characterization of silicophosphate sol-gel films doped by CdS colloidal by excitation and luminescence spectroscopy and morphological characterization by SEM-EDX analysis;
• SEM images of silicophosphate sol-gel films doped by CdS colloidal revealed their porous morphology specific to sol-gel method and SEM images on the cross section of the films allowed to measure the thickness (about 100 nm);
• Films prepared from phosphate glass doped by CdS have been prepared by PLD technique;
• The up-mentioned films have been characterized by XRD analysis and morphological analysis (SEM-EDX), showing in evidence: (1) CdS crystallites having cubic cell (dimension about 7 nm); (2) the existence of spherulitic and irregular nanometer and micron units specific to PLD technique; (3) the thickness of the deposited films is of micron order; (4) the presence of chemical elements from the glass target, dopant and substrate;
• Silicophosphate sol-gel films doped by CdSe gave been prepared;
• The up-mentioned films have been optically characterized by excitation and emission spectroscopy, revealing a narrow luminescence band in the green range of the visible spectrum, suggesting a relative narrow dimensional distribution of CdSe particles;
• PLD films have been prepared from CdSe target of 99.99 % purity;
• The investigation of the up-mentioned films deposited in the frame of Stage V/2015 was continued in the present research stage by ellipsometry, luminescence and Raman spectroscopy;
• XRD analysis put in evidence hexagonal CdSe crystallites also revealed by Raman analysis and luminescence spectroscopy put in evidence luminescence bands in IR range, specific to CdSe dopant, SEM analysis showed in evidence spherulitic units of tens nanometer size, EDX analysis found CD, Se from the target and Si from the substrate and AFM analysis shows ten nanometer roughness;
• PLD films have been prepared from two targets: one made of phosphate glass containing ZnO and the other made of CdSe 99.99% purity, films prepared in the frame of Stage V/2015;
• In the frame of the present Stage VI/2016, the deposited films having CdSe concentration gradient have been analyzed by luminescence spectroscopy; the intensity of the luminescence peaks measured in different film zones is correlated with the CdSe amount gradient and the position of the emission peak is correlated with quantum confinement effect provided by the dopant particle size

 Scientific Events

• C. R. Iordanescu, M. Elisa, I. C. Vasiliu, M. I. Rusu, L. Constantin,M. Filipescu, M. Enculescu, “High purity CdSe thin films prepared by Pulsed Laser Deposition”,European Materials Research Society Conference-EMRS Spring Meeting 2016, 02-06.05.2016, Lille, France, Scientific Programme, Symposium C, poster C PI.5, pag. C-6
• C. Vasiliu, I. Ionita, A. Matei, C.R. Iordanescu, A. Emandi, “Sol gel derived films doped with ferrocenes derivatives for non-linear optics”, European Materials Research Society Conference-EMRS Spring Meeting 2016, 02-06.05.2016, Lille, France, Scientific Programme, Symposium AA, poster P2.5, pag.AA-15
• M. Elisa, I. C. Vasiliu, I. D. Feraru, R. Iordanescu, G. Epurescu, M. Filipescu, C. Plapcianu, C. Bartha, M. Enculescu, S. Peretz, “Synthesis and Characterization of PLD Glass Phosphate Films Doped with CdS Powder”, 5^th International Conference “Smart and Multifunctional Materials, Structures and Systems” CIMTEC 2016, Perugia, 05-09.06.2016, Scientific Programme, Symposium D, poster P33, pag.13
• Thermoluminescence measurements (TL) were done on silicophosphate sol-gel films doped with CdSe colloidal and, PLD phosphate films doped with CdS, respectively;
• TL measurements exhibit two luminescence peaks at 140^oC and, 300^oC, respectively, the emission being more significant in the case of PLD films, taking into account the higher thickness of these films.

 Published Articles

• C. Vasiliu, I. Ionita, A. Matei, M. Elisa, R. Iordanescu, I. Feraru, A. Emandi, “Homogenous smooth sol gel films doped with organic compounds for nonlinear optics”, Thin Solid Films, 601, pp. 73-75, 2016

 Articles accepted to be published

• M. Elisa, R. Iordanescu, I. C. Vasiliu, I. D. Feraru, G. Epurescu, M. Filipescu, C. Plapcianu, C. Bartha, R. Trusca, S. Peretz, “Synthesis and Characterization of PLD Glass Phosphate Films Doped with CdS “, J. Mater. Sci., 2016
• C. R. Iordanescu, M. Elisa, G. Epurescu, M. Enculescu, R.C.C. Monteiro, L. Constantin, „Characterization of CdS-Doped Glass Films Obtained by Pulsed Laser Deposition Method (PLD)”, Rom. J. Mater., 2016
• C. Vasiliu, I. Ionita, A. Matei, M. Elisa, R. Iordanescu, I. Feraru, A. Emandi, “Homogenous smooth sol gel films doped with organic compounds for nonlinear optics”, Thin Solid Films, 601, pp. 73-75, 2016

 Articles submitted to be published

• C. R. Iordanescu, M. Elisa, I. C. Vasiliu, M. I. Rusu, L. Constantin, M. Filipescu, M. Enculescu, “High purity CdSe thin films prepared by Pulsed laser Deposition”, Appl. Surf. Sci., 2016 (EMRS communication, 2016)