“…Surface wettability can be attributed to surface chemical composition and structure [14,15]. For TiO2, surface superwettability can be induced by photocatalysis, and with its excellent performance, TiO2 is increasingly being used in energy [16,17], textile [18,19], and catalysis [20], etc. Recently, important breakthroughs were made in the technology and basic research of TiO2, which included design of structures, modification on substrate, and multidirectional applications [21][22][23][24][25][26][27][28][29][30][31].…”