Hydrothermal Growth of Periodic, Single-Crystal ZnO Microrods and Microtunnels


  • This work was partially supported by the MRSEC Program of the National Science Foundation under Award No. DMR05-20415. Prof. Kim acknowledges the support from the Korea Ministry of Science and Technology through the National Research Laboratory.


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The controllable growth of a periodic hexagonal array of ZnO microrods and linear arrays of ZnO microtunnels has been demonstrated using hydrothermal synthesis and channel stamping. ZnO walls (see figure) are formed from a solution containing Zn(NO3)2·6 H2O at pH 10.9 for 24 h at 90 °C. The controlled growth of these ZnO crystals is expected to have great potential for biosensing, optical emission, and ultrasonic imaging applications.