Aggregation of Laser-Generated Gold Nanoparticles Mediated by Formalin

Bulletin of the Korean chemical society

Jae Kyu Song¹  Myung Soo Kim¹  Md. Alauddin¹  Seung Min Park¹  Madhusudan Roy¹  Kuk Ki Kim¹ 

关键词: Gold nanoparticles;    Formalin;    Aggregation;    Raman spectroscopy;    Surface plasmon resonance;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

We have investigated the effects of formalin on the assembly of colloidal gold nanoparticles (AuNPs) prepared by laser ablation of a solid gold target in deionized water. Upon addition of formalin, the surface plasmon resonance (SPR) band at 519 nm for pure AuNPs decreases and shifts to red while a new broad SPR band appears at ~700 nm. The red-shift is prominent with increase in the incubation time. The average size of the initial AuNPs is around 12 nm but it increases to 23 nm after addition of formalin. It turns out that formalin acts as a cationic surfactant for AuNPs with negative surface charge in the colloidal solutions. Furthermore, through analysis of the Raman spectrum of formalin and the density functional theory calculations, we confirm that methanediol is the main species in formalin which is in charge of the aggregation of AuNPs.

【 授权许可】

Unknown