Controlled synthesis of manganese tungstate nanorods for highly selective NH3 gas sensor

In this paper, single-crystalline MnWO4 nanorods were prepared through a facile single-step hydrothermal approach and used for gas sensing. The morphology and phase of the products were characterized in detail through transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and elemental dispersive spectrum analyses. Results showed that the as-prepared MnWO4 nanorods possess uniform shape with their length of 250-300 nm and width of 20-30 nm. The nanorods were used to fabricate sensors for detecting reducing gases such as NH3, H2 and CO and evaluate gas sensing properties. The sensors exhibit not only good response and fast response time, but also almost full recovery and good stability, to NH3 gas.