抗坏血酸还原法制备金纳米花的机理

Mechanism in the Preparation of Gold Nanoflowers by Ascorbic Acid Reduction

研究了以抗坏血酸和氯金酸为生长溶液制备金纳米花的反应机理.结果表明,通过改变生长溶液中抗坏血酸浓度可以调节小尺寸的初级金粒子在种子表面的聚集方式及金纳米花的熟化速度,从而影响金纳米花的形貌和光学性质.协同改变抗坏血酸浓度和p H值,可实现对金纳米花形貌及光学性质的有效调控.表面增强拉曼散射(SERS)性能评价结果表明,抗坏血酸还原法制备的金纳米花表面较清洁,对罗丹明6G有较好的拉曼增强效果.

The mechanism in the preparation of gold nanoflowers using the mixture of HAu Cl4 and ascorbic acid（AA） as growth solution was investigated. It was identified that the AA concentration affected the attachment of the small gold particles on the seeds and the intraparticle ripening of the gold nanoflowers,thus resulting in the formation of the flowers with different morphologies and optical properties. It is effective to tune morphology and optical property of the gold nanoflowers by optimizing the AA concentration and p H of the growth solution simultaneously. Surface enhanced Raman scattering（SERS） results indicated the as-prepared gold nanoflowers showed good SERS activity to Rhodamine 6G,suggesting the clean surface character of the flowers prepared by AA reduction.