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在SDS-PVP水溶液中采用N2H4·H2O还原CuSO4,在pH(10±0.5),(40±1.0)℃条件下反应55min得到橙色Cu2O溶胶,离心分离产物经XRD鉴定为Cu2O立方晶系晶体;SEM和TEM表明该法获得的晶体为形状规整、粒径分布窄的Cu2O中空亚微球,并证实系由大量10nm量级的原级Cu2O纳米晶粒组装而成.根据实验事实推断,SDS-PVP项链状软团簇提供了“双重软模板”功能,借助独特的“模板诱导两级组装”作用一锅法合成了Cu2O中空亚微球.Cu2O中空亚微球生长的可能途径为:首先,项链状软团簇中的SDS束缚胶束作为第一重软模板,诱导一级组装10nm量级的原级Cu2O纳米晶粒;然后,软团簇中立体桥联SDS束缚胶束的PVP链节作为第二重软模板,诱导一定空间范围内的原级Cu2O纳米晶粒长大并进一步聚集/二级组装,经一锅法合成得到次级Cu2O中空亚微球.实验结果证明该一锅法温和、简便、快捷,Cu2O中空亚微球的粒径分布窄.
The Cu2O sol was obtained by reduction of CuSO4 in aqueous solution of SDS-PVP with pH = 10 ± 0.5 and (40 ± 1.0) ℃ for 55 min, and the product was identified as Cu2O cubic crystal by XRD. SEM And TEM indicate that the crystals obtained by the method are Cu2O hollow submicrospheres with a regular shape and a narrow particle size distribution and are confirmed by the assembly of a large amount of primary Cu2O nanocrystals on the order of 10 nm.According to experimental results, The necklace-shaped soft clusters provide the “double soft template” function, and the Cu2O hollow sub-microspheres are synthesized in one pot by the unique “template-induced two-stage assembly” effect. : First, the SDS-bound micelles in the necklace-like soft clusters were used as the first soft template to induce the primary assembly of 10nm-sized primary Cu2O nanocrystals. Then, the soft clusters were bound to SDS-bound micelles PVP link as the second soft template to induce the growth of primary Cu2O nanocrystals in a certain spatial range and further aggregation / secondary assembly, and the secondary Cu2O hollow sub-microspheres were synthesized by one-pot method.The experimental results show that One-pot method is mild, simple and quick, and the particle size distribution of Cu2O hollow sub-microspheres is narrow.