One-Step Synthesis of Matchstick-Like Ag2S-ZnS Nanorods and Its Optical Properties
A one-step method was developed to synthesize Ag2S-ZnS heterojunction using [(C4H9)2NCS2]Ag and [(C4H9)2NCS2]2Zn as precursors. The morphology of Ag2S-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 Ag2S-ZnS heterojunction, with the reaction temperature increasing from 110℃ to 170℃, the average diameter of Ag2S 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 [(C4H9)2NCS2]Ag and [(C4H9)2NCS2]2Zn at different temper-atures. The optical bandgap of Ag2S-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.
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