Microscopy of nanoobjects
Atomic-Force Microscopy of Laser-Induced Periodic Surface Structures
Snizhko D.V., Muzyka K.M.
Kharkiv National University of Radio Electronics, Ministry of Science and Education of Ukraine. Prospect Nauky, 14, Kharkiv-61166, Ukraine. 
E-mail: dmytro.snizhko@nure.ua

In this work, we investigated morphology features of electrode materials modified by laser-induced periodic surface structures LIPSS. Femtosecond laser irradiation stimulates material reorganization on an illuminated material. Processing parameters were changing for femtosecond laser ablation of different electrode material as glassy carbon and stainless still to obtain a variety of structures on the electrode surface. Variation of the scanning interval from 1 μm to 15 μm allows the formation LIPSSs with different morphology characteristics. Recognition of technology parameter influence on surface features was done by using atomic-force microscopy of modified electrode samples (AFM NT-206, Microtestmachines Co.).
Investigation of morphology properties was done on different hierarchical levels of LIPSS. Modification of electrode by LIPSS is interesting for sensor application. Sufficient increasing of electrode surface area supports the rise of the density of immobilized chemicals on an electrode surface. Electrode surface functionalization can be done by different methods [1]. 
Atomic-force microscopy is helpful in recognition of technology process impact on material surface parameters [2]. This is a unique method of material surface visualization that applicable for thin organic film assays. Determination of the impact of surface morphology on analytical properties of sensors structure was done to verify perspectives LIPSS utilization for electrochemical sensor fabrication.
Acknowledgements. This work is supported by the National Research Fund of Ukraine project (application reg. number 2020.02/0390).

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