1. Institute of Electrical Engineering and Plasma Technology, Faculty of Electrical Engineering and Information Sciences, Ruhr University Bochum, Bochum, Germany
2. Laboratory of Industrial Chemistry (LTC), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Bochum, Germany
3. Research Group for Biomedical Plasma Technology, Faculty of Electrical Engineering and Information Sciences, Ruhr University Bochum, Bochum, Germany