Effects of Heat Treatment and Doping of Nb~(5+) on Sensitivity Properties of TiO_2-based Material

Titanium is a premium metal- oxide material sensitive to trimethylamine (TMA) gas. To obtain high sensitivity and low power of elements, annealing in N2, doping with Nb5+ and long-time sintering were applied to improve the conductivity of TiO2-based sensitive materials. It is concluded that low oxygen pressure can enhance self-semiconductorization. Doping with 10% Nb5+ that substitutes for Ti4+ and long-time sintering that promotes conversion from Ti3+ to Ti4+ can improve conductivity of material and stability of elements. As a result, a new method is procured to make low-resistance sensor with high sensitivity and good selectivity.