Synthesis of ZnO Microwires and Tetrapods by Optical Furnace

Fabien Giovannelli (1) , Gabriel Rajonson , Jérôme Wolfman (1) , Fabian Delorme (1)

1 GREMAN - UMR 7347 - GREMAN (matériaux, microélectronique, acoustique et nanotechnologies)

In this study, a new route is described in order to obtain wires which can reach a few hundreds of micrometers long. ZnO rod is sintered at 900 1C for 10 h in air. Then the centimetric rod is placed in an optical furnace. The optical furnace allows to reach a thermal gradient of about 350 1C/cm. In a first step, the vaporization of ZnO occurs, and in a second step the condensation of ZnO on the rod appears and leads to the growth of ZnO microwires (MWs). In few minutes, the MWs can reach in the c-direction a dimension higher than 100 μm with a diameter close to ten microns. The shape of the MWs is hexagonal which is consistent with the crystal structure of ZnO (P63mc group). The MWs exhibit a high crystalinity. & 2013 Elsevier B.V. All rights reserved.

Mots clés: Microwires; Optical furnace; Tetrapods; ZnO

Domaines: Matériaux

Fabien Giovannelli, Gabriel Rajonson, Jérôme Wolfman, Fabian Delorme. Synthesis of ZnO Microwires and Tetrapods by Optical Furnace. Materials Letters, 2013, 107, pp.194--196. ⟨10.1016/j.matlet.2013.05.138⟩. ⟨hal-01755976⟩