Abstract
Abstract Hollow crystals of ZnO, in the shape of needles, have been grown for the first time using a modified vapor phase technique. The technique already in use for the growth of ZnO crystals has been modified by making Zn and hence ZnO vapor available at the growth temperature itself and in the same reaction zone where the growth actually takes place. The hollow needles up to 10 mm in length and 1 mm in diameter have been observed to grow on the ZnO substrate. The growth of these crystals has been attributed to the condensation of ZnO vapors, which are formed by the spontaneous oxidation of Zn vapors coming out from the hole of the growing crystal.
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