TiO₂ nanoflowers based humidity sensor and cytotoxic activity

We have systematically investigated the humidity sensing performance and cytotoxic activity of TiO₂ nanoflowers synthesized by hydrothermal method. Our result reveals that TiO₂ nanoflower based sensor devices show good performance at room temperature with a maximum sensitivity of ∼815% along with a response time of ∼143 s and a recovery time of ∼33 s. Our findings also evaluate the cytotoxic effect of TiO₂ nanoflowers on human HepG2 cell lines. The cells are cultured in DMEM medium with varying concentrations of TiO₂ nanoflowers for 24, 48 and 72 hours respectively. The results indicate that TiO₂ nanoflower doses time dependently suppress the proliferation of HepG2 cell lines.