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Katerina Lazarova   Mrs.  Post Doctoral Researcher 
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Katerina Lazarova published an article in July 2018.
Research Keywords & Expertise
0 A
0 optical properties
Top co-authors
Svetlana Mintova

51 shared publications

State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, China National Petroleum Corp. (CNPC)China University of Petroleum (East China) Qingdao 266555 P.R. China

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.)

Tsvetanka Babeva

6 shared publications

Institute of Optical Materials and Technologies (Bulgaria)

Marina Vasileva

5 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 - 2018)
Total number of journals
published in
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
DOI See at publisher website ABS Show/hide abstract
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.
Article 3 Reads 2 Citations One-dimensional PMMA–V2O5 photonic crystals used as color indicators of chloroform vapors K. Lazarova, R. Georgiev, M. Vasileva, B. Georgieva, M. Spas... Published: 07 May 2016
Optical and Quantum Electronics, doi: 10.1007/s11082-016-0577-z
DOI See at publisher website
Article 4 Reads 10 Citations Vapor Responsive One-Dimensional Photonic Crystals from Zeolite Nanoparticles and Metal Oxide Films for Optical Sensing Katerina Lazarova, Hussein Awala, Sébastien Thomas, Marina V... Published: 09 July 2014
Sensors, doi: 10.3390/s140712207
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
The preparation of responsive multilayered structures with quarter-wave design based on layer-by-layer deposition of sol-gel derived Nb2O5 films and spin-coated MEL type zeolite is demonstrated. The refractive indices (n) and thicknesses (d) of the layers are determined using non-linear curve fitting of the measured reflectance spectra. Besides, the surface and cross-sectional features of the multilayered structures are characterized by scanning electron microscopy (SEM). The quasi-omnidirectional photonic band for the multilayered structures is predicted theoretically, and confirmed experimentally by reflectance measurements at oblique incidence with polarized light. The sensing properties of the multilayered structures toward acetone are studied by measuring transmittance spectra prior and after vapor exposure. Furthermore, the potential of the one-dimensional photonic crystals based on the multilayered structure consisting of Nb2O5 and MEL type zeolite as a chemical sensor with optical read-out is discussed.
Article 0 Reads 5 Citations Zeolite films as building blocks for antireflective coatings and vapor responsive Bragg stacks Tsvetanka Babeva, Hussein Awala, Marina Vasileva, Jaâfar El ... Published: 01 January 2014
Dalton Transactions, doi: 10.1039/c4dt00711e
DOI See at publisher website PubMed View at PubMed