自模板法合成银纳米碗

Single-Crystalline Silver Nanobowls Synthesized by Self-Template Method

摘要:

采用自模板法合成了碗状银纳米材料，研究了银纳米碗的结构和生长机理。结果表明：AgNO₃和NaOH反应生成Ag₂O纳米簇，然后加入还原剂甲醛，在Ag₂O模板表面形成Ag纳米壳，副产物CO₂则在Ag壳内聚集。随着反应的进行，不断增大的压力最终击穿Ag壳，形成了直径约为200 nm的Ag纳米碗。该方法为特殊结构贵金属纳米材料的研究提供了理论和实验基础。

Abstract:

The silver nanobowls were prepared by self-template method, and the structure and growth mechanism of Ag nanobowls were investigated. Results show that the Ag₂O clusters result from the reaction of AgNO₃ and NaOH. After adding the reductant methanal, Ag nano-shell is obtained on the Ag₂O cluster surface with the by-product CO₂ inside the Ag nano-shell. With the reaction further proceeding, the increasing pressure breaks through the Ag nano-shell, thereby forming the Ag nanobowls with the size of approximately 200 nm. This unique synthesis method provides theoretical and experiment basis for the noble metal nanomaterials with special structure.