Synthesis, Characterization and Room Temperature Acetone Sensing of TiO_2 Nanotubes

摘要

TiO_2 nanotube arrays were synthesized by Anodization method. These samples were characterized by XRD, UV and SEM. X-ray diffraction pattern reveals that the formations of anatase phase form with good crystallanity of TiO_2 nanotube were prepared. SEM image confirms the nanotubes formation, regular arrangement of tubes, small cracks in the sample. The approximate tube size is found to be in the range of 20 nm to 35 nm. EDAX confirms the titanium and oxygen elements are only present and carbon present in the sample is in the negligible amount. From UV studies it is evident that absorption peak is at 467 nm, which is in visible range so the sample is visible active. The prepared samples are investigated for acetone sensing in a fabricated chamber at room temperature from 10 vol% to 50 vol% which shows rapid increase in resistance. Due to the substantial increase in reactive sites for acetone molecules, sample shows sensitivity rapidly even at room temperature and saturates with maximum sensitivity 80% to 140% for 10 vol% to 50 vol% respectively. For a minute response it shows 10% to 50% sensitivity for 10 vol% to 50 vol% respectively.