Synthesis Of Silver Nanoplates With Tunable Size Via Seeded Growth And Application In Conductive Ink

Noble metal silver nanoplates are typical two-dimensional（2D）metal nanomaterials,which could be used in tumor therapy,surface-enhanced Raman scattering（SER）biological imaging,catalysis,solar cells,and conductive inks due to their unique electronic and optical properties.So far,the methods for preparation of silver nanoplates include thermal/photochemical reduction synthesis,polyol method,template process and nano lithography,etc.It is proved that stacking faults structure are present within the silver nanoplates which stacked parallel to the（111）faces.What’s more,the stacking faults structure directed and drove the two-dimensional growth.Although the synthesis method of silver nanoplates is becoming mature,the formation process of the lamellar defect structure of silver nanoplates is still lack of in-depth understanding.In this paper,silver nanoplates were prepared by seed growth method and the formation process of middle dislocation defect structure in silver nanoplates was studied.The influence of various parameters on the growth of silver nanoplates was also studied and the optimum parameters for growth were investigated.With synthesis of a series of nanoplates,conductive ink which can be used in flexible electronic products was prepared.The specific research contents and conclusions are as follows:（1）In the preparation of silver nanoplate seeds,we have observed that the solution always changed from light yellow to deep gold within a short time.The color change process was corresponded to the aggregation of nanosize silver clusters,and stable silver nanoparticles（silver nanoplate seeds）were formed.The growth behavior and structure of the nanoparticles were investigated before and after the aggregation.It is demonstrated that the stacking faults structure was formed during the aggregation process.（2）The effects of reaction temperature and droplet acceleration on the growth of silver nanoplates were investigated.By adjusting the ratio of solvent,silver nanoplates with high purity could be obtained.As a results,nanoplates with adjustable size from 100 nm to 1000 nm were prepared.The prepared silver nanoplates with different sizes were dispersed in water,ethanol,glycerin and ethylene glycol,and the conductive ink was prepared.Finally,conductive ink with good performance was obtained.Based on the ink,conductive flexible film with good bending performance and resistivity of up to 80 μΩ.cm could be obtained.