采用两步水热法，第1步利用 Au 作为催化剂生长 ZnO 纳米杆；第2步利用醋酸锌分解成 ZnO纳米颗粒作籽晶层在ZnO 纳米杆的侧壁生长 ZnO 纳米枝条，在Si片上成功制备了枝干状 ZnO 纳米结构。利用 SEM、XRD 分别表征枝干状 ZnO 纳米结构的形貌和晶体结构，研究籽晶层、反应液浓度、反应时间等参数对枝干状ZnO 纳米结构形貌的影响。结果表明， Au作为催化剂生长的 ZnO 纳米杆具有沿(103)面择优取向生长的特性，而籽晶层对在侧壁生长 ZnO 纳米枝条至关重要。通过调节反应参数，可控制枝干状ZnO 纳米结构的形貌，当反应液浓度越小，反应时间越长，纳米枝条越细、越长。所制备的枝干状 ZnO 纳米结构具有很好的生物兼容性，可作为细胞支架材料。
Branched ZnO nanostructures with different morphologies have been synthesized successfully by intro-ducing a two-step hydrothermal process.First,ZnO nanorods were prepared on Si substrate using Au layer to assist the growth;second,ZnO nanowires were synthesized on the sidewall of first grown ZnO nanorods with thermal decomposed ZnO nanoparticulars as seed layer.SEM and XRD have been applied for the characteriza-tion of the morphology and microstructures of ZnO nanostructures.It was found that ZnO nanorods grown on Au/Si substrate showed a typical wurtzite structure with a (103)preferred orientation,and the seed layer was crucial for the growth of branched ZnO nanostructures.The diameter of second grown ZnO nanowires decreased with decreasing the content of solution;and their lengths increased with the growth time.It was also proved that the branched ZnO nanostructures are biocompatible and can be used as cell scaffold.
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