铋纳米线和纳米片的制备

Synthesis of Bi Nanowires and Nanoplates

通过调控水和乙二胺溶液的组份控制产物的形貌和结构,制备了铋纳米线和铋纳米片,研究了组份变化对产物形貌结构的影响,并依此提出了乙二胺模板效应以及由乙二胺引起的从动力学向热力学转换控制晶体生长的生长机制。铋纳米线的体膨胀系数随着温度的升高减小,并在一转变温度(455℃左右,低于块体的转变温度)变为负值。

Bi nanowires and nanoplates were synthesized by controlling the composition of the mixture solution of water and ethylenediamine.The effect of the composition exchange on the morphology and structure was investigated.The results show that the formation mechanisms of the nanowires and nanoplates can be ascribed to the template effect of ethylenediamine and ethylenediamine-induced transition from thermodynamic to dynamic control of the growth.The volumetric thermal expansion coefficient of nanowires decreases with increasing temperature and becomes negative at the conversion temperature （about 455℃）.