氧化锌纳米线自组装定向生长动力学研究

Kinetics of ZnO Nanowires Self-assembling Oriented Growth

研究了以极性高分子(如聚丙烯酰胺)长分子链作为自组装网络,利用高分子软模板控制ZnO纳米点成核和ZnO纳米线定向生长,从而使ZnO纳米线在半导体硅衬底上自组装生长的过程;采用差示扫描量热法(DSC)测试了高分子络合-烧结法制备ZnO纳米线的结晶曲线,对其结晶动力学进行了研究,推导出结晶动力学方程为:1-Xt=exp(-7.475×10-2t1.9);并利用热重(TG)测试结果,通过热分解反应,导出了反应动力学方程:dα/dT=3.76×1023e-21340.8/T(1-α)2.8/φ,从而得到了化学反应速度随时间、浓度和温度变化的关系,并用结果解释了实验现象.

Zinc oxide （ZnO） nanowires were grown on silicon substrate by using polar polymer （such as PAM） long-chain as self-assembling grid backbone via polymer soft-template controlling nucleation of ZnO nanodots and oriented growth of ZnO nanowires. The kinetics of the crystallization of ZnO nanowires and the thermal decomposition of the complex PAM-Zn^2＋ during preparation were investigated by means of differential scanning calorimetry （DSC） and thermogravimetry （TG）, and the relationship between the reaction rate and time, concentration and temperature were obtained,1-Xt=exp（-7.475×10^-2t^1.9） and dα/dT=3.76×10^23/φe^-21340.8/T（1-α）2.8. The calculation results are in good accordance with the experiments. It is found that one dimensional wire-like growth model is in favour of the nucleation and crystal growth behavior of ZnO nanowires, and the ZnO nanowires possess perfect crystal structure.