Li etal. [38], thebroadvibrationpeakat280cm1 resulted from
‘Ti–O’ vibrating modes in the titania framewor kwhile Kasuga
et al. [35] reported due to Na–O–Ti. As shown in Fig. 7, the
annealedTiO2 nanowiresat500 1C asafunctionofgrowthtime
showed similarvibrationmodesat143,398,518and637cm1
whichcanbeassignedtoananatasephase.