1. Department of Chemistry, Ruhr University Bochum, Bochum, North Rhine-Westphalia 44801, Germany
2. Department of Biology and Biotechnology, Ruhr University Bochum, Bochum, North Rhine-Westphalia 44801, Germany
3. Fraunhofer Institute for Microelectronic Circuits and Systems, Duisburg, North Rhine-Westphalia 47057, Germany