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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。
In this paper, the rapid microwave heating method, the use of sodium citrate reduction of chloroauric acid, the successful reduction of the particle size from 10nm to 60nm wine red gold sol. We use this heating method to compare the different heating time and the amount of different reducing agent prepared under the conditions of a variety of particle size gold sol, and its absorption spectrum, transmission electron microscopy and Raman spectroscopy to characterize its SERS activity, select R6G, 4-MBA And crystal violet as probe molecules to study their SERS activity. The results show that with the increase of heating time or reducing agent, the particle size of gold nanoparticles will gradually decrease, and the stability of gold nanoparticles sol prepared under suitable heating time and reducing agent dosage is good. After concentration, Is a very effective SERS active substrate. Microwave heating method is simple, inexpensive, this colloid can be used as an ideal SERS active base for batch preparation and application.