Journal of Radiation Research and Radiation Proces ›› 2018, Vol. 36 ›› Issue (2): 20302-020302.doi: 10.11889/j.1000-3436.2018.rrj.36.020302

• RADIATION CHEMISTRY • Previous Articles     Next Articles

Liquid-phase irradiation reduction and self-assembly growth mechanism of silver nanodendrites

CUI Guoshi1,2, ZHAO Hongying1,2, DANG Congjun1,2, SHU Xingjuan1,2   

  1. 1. Henan Kegao Radiation Chemical Technology Co. Ltd., Luoyang 471000, China;
    2. Henan Key Laboratory for Radiation Chemistry Advanced Materials, Luoyang 471000, China
  • Received:2017-12-11 Revised:2018-02-28 Online:2018-04-20 Published:2018-04-19

Abstract:

Silver nanodendrites of fine fractal structure were prepared under γ-ray liquid-phase irradiation with polyvinyl alcohol (PVA) as stabilizer. The morphology of the structure was characterized by Transmission electron microscope, High-resolution transmission electron microscope, Selective electron diffraction, and X-ray diffraction. The synthesis conditions and growth mechanism of the silver nanodendrites were studied. The results showed that PVA concentration was a key factor influencing the formation of the silver nanodendrites. In a reaction system with concentration of AgNO3, isopropanol at 0.02 mol/L and 1.0 mol/L, respectively, and absorbed dose of 75 kGy, the suitable concentration of PVA was between 2.5% and 5.0%. The silver nanoparticle concentration was another major factor affecting the formation of the silver nanodendrites. A suitable concentration of silver nanoparticles could be obtained with the concentration of silver nitrate at 0.02 mol/L and the absorbed dose between 30 kGy and 75 kGy. As a free radical scavenger, isopropanol affected the growth of the silver nanodendrites by interacting with PVA. The self-assembly growth mechanism of the silver nanodendrites could be described in three steps. Firstly, silver ions aggregated, nucleated, and grew to form polyhedral near-spherical primary particles. Secondly, the primary particles aggregated to form secondary particles such as twins and snowflake-like grains. Finally, the secondary particles aggregated with the primary particles to form silver nanodendrites.

Key words: Silver nanodendrite, Irradiation reduction, Growth mechanism

CLC Number: 

  • TL13