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为了研究纳米材料在液态环境下的反应机理,开发了一组新型的液体透射电镜(TEM)芯片.该组液体基芯片不仅可以实现上下窗口自对准的功能,而且可以实现在纳米级别控制液体层的厚度.利用该组液体芯片我们成功地观测了液态环境下Ag纳米线与S溶液的化学反应过程.实验结果表明,该反应过程不是简单的一步化合反应形成最终产物硫化银(Ag_2S),而是在反应过程中先形成可溶解的中间产物多硫化银(Ag_2S_4).这个中间产物会导致一小部分反应物Ag纳米线的溶解,而大部分Ag纳米线转变成Ag_2S纳米颗粒的聚集物.我们相信这一液体TEM芯片技术可以被广泛应用到液相环境下各种化学反应过程的研究.
In order to study the reaction mechanism of nanomaterials in liquid environment, a series of new liquid transmission electron microscopy (TEM) chips have been developed, which can not only realize the function of self-alignment of the upper and lower windows, but also realize the control of liquid The thickness of the layer.We successfully observed the chemical reaction between Ag nanowires and S solution in the liquid environment.The experimental results show that the reaction process is not a simple one-step reaction to form the final product silver sulfide (Ag 2 S) Instead, the soluble intermediate silver sulfide (Ag 2 S 4) formed during the reaction, leading to the dissolution of a small fraction of the reactant Ag nanowires, whereas most of the Ag nanowires were transformed into aggregates of Ag 2 S nanoparticles We believe this liquid TEM chip technology can be widely applied to the research of various chemical reaction processes in liquid environment.