Pressure control as an effective method to modulate aggregative growth of nanoparticles

• 作者: Jian Xu Yuan Shu Qian Xia Yang-Long Guo Guo-Jun Zhou Wang-Cheng Zhan
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 1808-1816
• 页数: 9页
• 语种: 英文

摘要

Recent studies suggested that the interactions between particles can induce aggregative nucleation and growth processes beyond those predicted by the traditional LaMer model of nanoparticle formation,but their nucle-ation and growth processes are still unclear.Here,we report a simple way to control the interaction between nanoparticles by manipulating the oleylamine(OAm)adsorbed on the surface of the nanoparticles.The size distributions of Ag nanoparticles produced at different reaction pressures were monitored as evidence for aggregative growth.From these kinetic data,the aggrega-tive nucleation rate(F)of primary Ag nanoparticles under a 0.01 MPa was demonstrated to be faster than that under atmospheric pressure.This leads to a higher uniformity of Ag nanoparticles in a shorter time(10 min)than that achievable with previous methods.Furthermore,Ag nanoparticles supported on TiO2 exhibited a remarkable performance in the catalytic reduction of 4-nitrophenol(4-NP).After 4 min,4-NP was completely reduced into 4-aminophenol(4-AP).