1. Department of Information Engineering, University of Brescia, Via Valotti 9, 25131 Brescia, Italy
2. SENSOR Laboratory, CNR-INO, Via Branze 45, 25123 Brescia, Italy
3. Chemistry for Technologies
Laboratory Dipartimento di Ingegneria Meccanica e Industriale, INSTM and University of Brescia, Via Branze 38, 25123 Brescia, Italy
4. Istituto per l’Energetica
e le Interfasi, Dipartimento di Scienze Chimiche, CNR and Università di Padova, Via Marzolo 1, 35131 Padova, Italy
5. Luleå University of Technology, 971 98 Luleå, Sweden