火柴状Ag_(2)S-ZnS纳米棒的一步法合成及光学性质研究

One-Step Synthesis of Matchstick-Like Ag_(2)S-ZnS Nanorods and Its Optical Properties

采用[(C_(4)H_(9))_(2)NCS_(2)]Ag和[(C_(4)H_(9))_(2)NCS_(2)]2Zn为前驱体,通过一步法合成了Ag_(2)S-ZnS异质结。不同温度下合成的Ag_(2)S-ZnS异质结的形貌类似火柴状结构,尺寸随着反应温度的变化而变化。当反应温度从110oC升高至170℃时,火柴头部Ag_(2)S纳米颗粒以及杆部ZnS纳米棒平均直径越来越小,两者之间的差值越来越大,这可能是由于不同温度下[(C_(4)H_(9))_(2)NCS_(2)]Ag和[(C_(4)H_(9))_(2)NCS_(2)]2Zn活性差异导致的。不同温度下制备的Ag_(2)S-ZnS异质结的光学带隙不同,当反应温度从110℃升高至170℃时,ZnS纳米棒的平均直径从(7.0±1.1)nm降低到(6.3±0.8)nm,光学带隙从3.79 eV增加到3.84 eV。

A one-step method was developed to synthesize Ag_(2)S-ZnS heterojunction using[(C_(4)H_(9))_(2)NCS_(2)]Ag and[(C_(4)H_(9))_(2)NCS_(2)]2Zn as precursors.The morphology of Ag_(2)S-ZnS heterojunctions synthesized at different temper atures was similar to matchstick,while the size changed with the variation of reaction temperature.In the matchstick-like Ag_(2)S-ZnS heterojunction,with the reaction temperature increasing from 110℃ to 170℃,the average diameter of Ag_(2)S nanoparticles and ZnS nanorods both became smaller,and the difference of the diameter between the nanoparticle and nanorod became larger.This may be ascribed to the differences in the activity of[(C_(4)H_(9))_(2)NCS_(2)]Ag and[(C_(4)H_(9))_(2)NCS_(2)]2Zn at different temper⁃atures.The optical bandgap of Ag_(2)S-ZnS heterojunctions varied with the reaction temperatures.When the reaction tempera⁃ture increases from 110℃ to 170℃,the average diameter of ZnS nanorods decreases from(7.0±1.1)nm to(6.3±0.8)nm,and the optical bandgap increases from 3.79 eV to 3.84 eV.