The experimental results show that diameters of the nanorods are around 100 nm to 300 nm with lengths of several micrometers. With the success of preparing SnO2 nanorods, which will improve in the research and preparation of gas sensor based on SnO2 materials. | Journal of Chemistry, Vol. 47 (5), P. 647 - 652, 2009 INFLUENCES OF THE MOLE RATIO SnO2/NaOH ON THE GROWTH OF SnO2 NANORODS Received 9 June 2009 1 KHUC QUANG TRUNG , VU XUAN HIEN2, DANG DUC VUONG2, NGUYEN DUC CHIEN2 1 University of Fire fighting and Protection 2 Hanoi University of Technology abstract SnO2 nanorods have been successfully prepared by hydrothermal method at low temperature. The mole ratio of SnO2/ NaOH plays important role in the morphology and diameter of SnO2 nanorod. Besides, the possible growth mechanisms of SnO2 nanorods are also discussed. Structural properties and surface morphologies of the SnO2 nanorods were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results show that diameters of the nanorods are around 100 nm to 300 nm with lengths of several micrometers. With the success of preparing SnO2 nanorods, which will improve in the research and preparation of gas sensor based on SnO2 materials. Keywords: SnO2, nanorods, hydrothermal method. I - INTRODUCTION In the advances of the nanotechnology, scientists have recognized that materials in nanosize will expose preeminent characteristics. Recently, semiconductor nanomaterials have attracted much attention because of their potential scientific significance and technology application. Tin dioxide is an n-type semiconductor material with a wide band gap and high chemical stability [1]. It has been widely applied for various devices, such as gas sensor, dye-base solar cell and transparent conducting electrodes [2-5]. As the gas sensing and other properties of SnO2 materials are strongly dependent on their size and shape, it is obvious that the controlled synthesis of the nano/microstructure of SnO2 materials is very important for special applications [1]. Up to now, SnO2 materials with different morphology have been fabricated by a few methods. For example, SnO2 nanoparticles have successfully been prepared by sol- gel method [5, 6]. SnO2 .
