Highly sensitive and quickly responsive core-shell hierarchical porous Li4Ti5O12-TiO2 humidity sensors

- Li4Ti5O12-TiO2 with different compositions and morphologies were synthesized.
- Effects of composition and morphology on humidity sensors were studied.
- Core-shell (Li4Ti5O12)0.44-(TiO2)0.56 (L0.44-T0.56-CS) has the best performance.
- L0.44-T0.56-CS has a high sensitivity with R varies 1370 times from 11 to 95% RH.
- Response and recovery times of L0.44-T0.56-CS from 33 to 95% RH are ∼9 s and ∼17 s.