摘要
本文采用微波快速加热法,利用柠檬酸钠还原氯金酸的原理,成功还原出粒径从10nm到60nm的酒红色金溶胶。我们用此加热法对比不同加热时间以及不同还原剂的用量条件下制备出的多种粒径金溶胶,并用吸收光谱、透射电镜和拉曼光谱对其SERS活性进行表征,选择R6G、4-MBA和结晶紫作为探针分子对其进行SERS活性研究。结果表明,随着加热时间或还原剂量的增加,金纳米粒子的粒径会逐渐减小,在适宜加热时间与还原剂用量的条件下所制备的纳米金溶胶稳定性较好,将其浓缩后是一种非常有效的SERS活性基底。微波加热方法简单、价格低廉,此种胶体可作为理想的SERS活性基底进行批量制备与应用。
A method for rapidly synthesized Au colloidal under microwave irradiation was present in this paper. Size of the Au nanoparticles varied from 10 nm to 60 nm along with varying heating time or mol fractions by chloroauric acid solution reduced with sodium citrate. The prepared Au nanoparticles were characterized by transmission electron microscope （TEM）, ultraviolet-visible （UV-Vis） spectrophotometer and Raman spectroscopy. The results show that the nanoparticle size and shape are highly dependent on the heating time and the molar ratios of the reducing agent. By the SERS measurements of R6G, 4-MBA and Crystal violet, this Au colloid is shown to be an excel- lent SERS substrate with good stability. As the fabrication process of this SERS substrate is simple and inexpensive, this method may be used in large-scale preparation of substrates for SERS applica- tion.
出处
《光散射学报》
北大核心
2014年第1期13-18,共6页
The Journal of Light Scattering
基金
国家自然科学基金(11104030
1
678090
81101110
11274065
61210016和11274065)
福建省科技厅项目(2013J05004
2013J01225)
福建省教育厅项目(JA11055
JB12012)
关键词
纳米金
微波加热法
SERS
colloidal Au nanoparticles
microwave irradiation
SERS
