Nanostructured surfaces

Electrogenerated chemiluminescence in thin polymer films on smooth and nanostructured electrode surfaces
Zholudov Yu.T.1, Vasylkovskyi V.S.1,2, Muzyka K.M.1, Gnilitskyi I.M.3
1 Kharkiv National University of Radioelectronics. Nauki Ave., 14, Kharkiv-61166, Ukraine. 
E-mail: yuriy.zholudov@nure.ua.
2 Institute for Scintillation Materials, NAS of Ukraine. Nauky Ave., 60, Kharkiv-61072, Ukraine.
3 LLC Novinanolab. Pasternaka str., 5, Lviv-79015, Ukraine.

Electrogenerated chemiluminescence (ECL) is a luminescence excited in the course of electron transfer between electrochemically created species in solutions during electrolysis. ECL is a powerful analytical tool in biology, medicine, environmental monitoring etc. [1]. Among promising directions in modern ECL analytics is the study of ECL in thin fluorescent films on the electrode surface. 
In this work, we have studied aqueous ECL from diphenylanthracene in polyvinyl butyral film on the glassy carbon electrode surface in reaction with tetraphenylborate coreactant [2]. The ECL response of the modified electrodes strongly depends on the scan rate of electrode potential, the content of electron-accepting species in the solution, and can give rise to highly intense ECL emission thus allowing coreactant detection down to the nanomolar range. Another factor affecting ECL response is the nanomorphology of the underlying electrode substrate that was modified with laser-induced periodic surface structures. 
The proposed approach to the development of ECL sensors demonstrates advantages over common homogeneous ECL systems and reveals potential for detection of oxidative species in the solution. The work was partly supported by the National Research Fund of Ukraine project 2020.02/0390. 

1.	Miao W. Electrogenerated chemiluminescence and its biorelated applications // Chem Rev.-2008.-108.-P. 2506-2553.
2.	Zholudov Yu., Xu G. Electrogenerated chemiluminescence at a 9,10-diphenylanthracene/polyvinyl butyral film modified electrode with a tetraphenylborate coreactant // Analyst.-2018.-143.-P. 3425-3432.
3.	Gnilitskyi I., Derrien T., Levy Y. et al. High-speed manufacturing of highly regular femtosecond laser-induced periodic surface structures: physical origin of regularity // Sci Rep.-2017.-7.- art. 8485.