[1] Univ Aveiro, Dept Fis, P-3810193 Aveiro, Portugal
[2] Univ Aveiro, CICECO, P-3810193 Aveiro, Portugal
[3] Univ Tras Os Montes & Alto Douro, Dept Quim, P-500801 Vila Real, Portugal
[4] Univ Tras Os Montes & Alto Douro, CQ VR, P-500801 Vila Real, Portugal
[5] Univ Aveiro, Dept Quim, P-3810193 Aveiro, Portugal
[6] UNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
[7] Chalmers, Dept Appl Phys, S-41296 Gothenburg, Sweden