Low Temperature Physics: 48, 349 (2022); https://doi.org/10.1063/10.0009742
Controllable structures on the surface of natural polymers made by proton beam writing and femtosecond laser treatment
O. V. Kalinkevich, H. Ye. Polozhii, S. V. Kolinko, Ye. I. Zinchenko, A. Yu. Karpenko, V. A. Baturin, A. G. Ponomarev, A. N. Kalinkevich, and S. N. Danilchenko
Institute of Applied Physics, NAS of Ukraine, Sumy 40000, Ukraine
A. Daskalova and L. Angelova
Institute of Electronics, Bulgarian Academy of Sciences, Sofia 1784, Bulgaria
Sofia University “St. Kliment Ohridski”, Sofia, Bulgaria
Received November 30, 2021, published online February 25, 2022
Microstructures with a given topology were created on the surface of a pure chitosan films and the same films with nanometer Ti- and Zn-containing layers deposited by magnetron sputtering. These structures were obtained using two methods: proton lithography and femtosecond laser processing. The quality of the structures (the sharpness of the walls and the thickness of the channel) is comparable to the quality of the structures obtained in the classical synthetic resist for proton lithography (polymethylmethacrylate, PMMA). A thin metal layer on the surface of the biopolymer matrix (resist) does not interfere with the formation of structures by the proton beam writing method. Laser treatment allows to create repeating structures that control the biocompatibility of the treated surface.
Key words: micro- and nanostructures, proton lithography, femtosecond laser processing, nanofilms.