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Tsvetanka Babeva   Dr.  Institute, Department or Faculty Head 
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Tsvetanka Babeva published an article in March 2019.
Research Keywords & Expertise
0 A
0 Gel
0 Nanoparticles
0 Thin
0 Thin Films
Top co-authors See all
Svetlana Mintova

52 shared publications

Laboratoire Catalyse et Spectrochimie (LCS), Normandie Univ, ENSICAEN, UNICAEN, CNRS, 16000 Caen, France

Hussein Awala

21 shared publications

Laboratoire Catalyse et Spectrochimie, Normandie University, ENSICAEN, UNICAEN, CNRS, 14050 Caen, France;(S.K.);(M.Z.);(H.A.);(V.R.)

Marina Vasileva

5 shared publications

Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Katerina Lazarova

4 shared publications

Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Sébastien Thomas

4 shared publications

Laboratoire Catalyse & Spectrochimie, Université de Caen, 6, boulevard du Maréchal Juin, 14050 Caen Cedex, France; s:(H.A.);(S.T.);(S.M.)

Publication Record
Distribution of Articles published per year 
(2014 - 2019)
Total number of journals
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Publications See all
Article 0 Reads 0 Citations Zeolites from fly ash embedded in a thin niobium oxide matrix for optical and sensing applications K Lazarova, S Boycheva, M Vasileva, D Zgureva, B Georgieva, ... Published: 01 March 2019
Journal of Physics: Conference Series, doi: 10.1088/1742-6596/1186/1/012024
DOI See at publisher website ABS Show/hide abstract
Thin films consisting of a sol-gel Nb2O5 matrix doped with fly ash zeolites in different volume fractions were deposited by the method of spin-coating. Zeolites of Na-X phase were prepared by long-term alkaline atmospheric conversion of coal ash collected from the electrostatic precipitators in TPP "AES Galabovo" supplied by lignite coal from the "Maritza East" basin using two different molarities of alkaline activator (NaOH). The surface morphology and structure of zeolite powders and films were studied by scanning electron microscopy and X-ray diffraction, respectively. Optical constants (refractive index and extinction coefficient) along with thickness of the films were calculated using a previously developed procedure comprising two steps of nonlinear minimization of the discrepancies between the measured and calculated reflectance spectra of films deposited on silicon substrates. The liquid adsorption and vapor sensing ability of fly ash zeolites were tested by measuring the reflectance spectra of the films prior to and after exposure to probe acetone molecules. The application of zeolites from fly ash for optical sensing is demonstrated and discussed.
Article 0 Reads 0 Citations Aluminum-doped zinc oxide thin films deposited by electrospray method Georgi Marinov, Konstantin Lovchinov, Violeta Madjarova, Vel... Published: 01 March 2019
Optical Materials, doi: 10.1016/j.optmat.2019.01.055
DOI See at publisher website
Article 2 Reads 0 Citations Influence of Macromolecular Architecture on the Optical and Humidity-Sensing Properties of Poly(N,N-Dimethylacrylamide)-... Katerina Lazarova, Marina Vasileva, Sijka Ivanova, Christo N... Published: 13 July 2018
Polymers, doi: 10.3390/polym10070769
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The influence of the macromolecular architecture of block copolymers containing poly(N,N-dimethyl acrylamide) (PDMA) on the optical characteristics and sensing properties of corresponding thin films is discussed. Series of hydrophilic PDMA-based copolymers of different chemical composition and chain architecture such as triblock, star-shaped, and branched were synthesized. The copolymers were characterized using conventional spectroscopic techniques as well as methods for characterization of copolymer macromolecular characteristics in solution, namely size-exclusion chromatography and static light scattering. Thin films of the copolymers of nanometer scale thickness were deposited on silicon substrates by the spin-coating method. The refractive index and extinction coefficient of the copolymer films were calculated from the reflectance spectra by using non-linear curve fitting methods and the composition-structure-optical properties relationships were evaluated. Humidity-sensing properties of the films were studied by measuring reflectance spectra of the films at a relative humidity range from 5 to 95%RH. The implementation of the copolymer films as optical sensors of humidity is justified and discussed.
PROCEEDINGS-ARTICLE 0 Reads 0 Citations Organic framework engineering in mesoporous Nb2O5 thin films used as an active medium for organic vapors sensing Rosen Y. Georgiev, Darinka Christova, Biliana Georgieva, Tsv... Published: 05 June 2018
Advances in Optical Thin Films VI, doi: 10.1117/12.2322527
DOI See at publisher website
Article 2 Reads 1 Citation Thin films from hydrophilic poly(N,N-dimethyl acrylamide) copolymers as optical indicators for humidity K Lazarova, L Todorova, D Christova, M Vasileva, R Georgiev,... Published: 01 January 2017
Journal of Physics: Conference Series, doi: 10.1088/1742-6596/794/1/012022
DOI See at publisher website
Article 0 Reads 0 Citations NOVEL METHODS FOR THE ASSESSMENT OF CRACK PROPAGATION IN ENDODONTICALLY TREATED TEETH Еkaterina Karteva, Neshka Manchorova-Veleva, Vesela Stefanov... Published: 20 September 2016
Journal of IMAB - Annual Proceeding (Scientific Papers), doi: 10.5272/jimab.2016223.1308
DOI See at publisher website