A General Strategy for Ultra-small Nanohybrids Synthesis via Coupled Competitive Reactions in a Hybrid Process
Microfluidic approaches have been attracting more and more attention in the NPs synthesisdue to their reduced scaling up risk and the precise reaction kinetic control of each stage alongthe microchannel that is desired for sketching formation mechanism spatiotemporally for controlled morphology and structure.1-13We developed simple programmed microfluidic processes (SPMPs),which have shown great powers in spatiotemporally splitting the NP formation and scale out features.5,7,14,1515,16 Herein,we extend SPMPs to a sequenced microfluidic and batch-cooling process with stage-controlled reaction kinetics.Growth of nanoparticles can be well-terminated at the defined stage by rapid cooling the reaction solution from the microchannel in the collecting receiver with reduced temperature.This hybrid process was then used in the structure and composition controlled synthesis of nanohybrids by coupling competitive reactions,or sequenced reducing-nucleation and co-precipitation,which were realized by introducing a second metal salt with low electrochemical potential (i.e.,AlCl3,ZnCl2) into the primary-metal-salt solution.Consequently,ultra-small magnetic-dielectrics(e.g.,FeAl@Al(1-x)FexOy),magnetic-semiconductors (e.g.,CoZn@Zn(1-x)CoxOy),plasmondielectrics(e.g.,AgAl@Al(1-x)AgxOy),plasmon-semiconductors (e.g.,AuZn@Zn(1-x)AuxOy)NPs of unique magnetic and optical properties and Pt-based nanocatalysts can be synthesized using N-methyl-2-pyrrolidone (NMP) and/or water as bi-channel solvents at a wide range of flow rates.
Yujun Song Junmei Wang Xiaomiao Shen Shuai Li Zhenlei Wang
Research Center for Modern Physics Technology,Department of Physics,School of Mathematics and Physic Department of Physics,Beihang University,Beijing 100191,China
国内会议
北京
英文
1-4
2015-10-16（万方平台首次上网日期，不代表论文的发表时间）