Surprisingly, the fast decay lifetime of H:TiO2 NFs significantly decreases to 0.34 ns Scientific Reports | 7:40896 | DOI: 10.1038/srep40896 6 www.nature.com/scientificreports/ Sample Pristine TiO2 NFs H:TiO2 NFs A1 (%) 54.4 94.3 τ1 (ns) 0.50 0.34 A2 (%) 45.6 5.7 τ2 (ns) ...