Preparation and characterization of rod-shaped MnO2 crystal

摘要

Rod-shaped MnO2 crystal was synthesized by a new route, the sample was a multicrystall with the mixture of x- and gamma-MnO2. From TEM results. it could be seen that the sample has a length of 250-350 not and a diameter of 15-25 nm. The ratio of length to the diameter could reach more than 15: 1. In the preparation process, the KMnO4 was used as oxidant and MnCl2 was the manganese source. The polyethylene glycol (PG) was added as the dispersant and the high molecular weight polyacrylamide (PAM) was introduced at the same time. When the reaction finished. the product was treated with steam for 3 h and then the rodshaped MnO2 crystal was obtained. The crystal was characterized by X-ray diffraction (XRD). electron diffraction (ED). transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM). (C) 2004 Elsevier Ltd. All rights reserved.