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首页> 外文期刊>Chemistry: A European journal >From nanoplates to microtubes and microrods: A surfactant-free rolling mechanism for facile fabrication and morphology evolution of Ag_2S films
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From nanoplates to microtubes and microrods: A surfactant-free rolling mechanism for facile fabrication and morphology evolution of Ag_2S films

机译：从纳米板到微管和微棒：无表面活性剂的轧制机制，可轻松制造Ag_2S膜并进行形态演变

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By a simple and facile wet-chemistry technique without any surfactant, various shapes of Ag_2S crystals-including leaflike pentagonal nanoplates, crinkly nanoscrolls, hexagonal prismlike microtubes, and microrods-were fabricated in situ on a large-area silver-foil surface separately. Detailed experiments revealed that the Ag_2S nanoplates were formed just by immersing the silver foil in a sulfur/ethanol solution at room temperature and atmospheric pressure, and they subsequently rolled into nanoscrolls and further grew into microtubes and microrods under solvothermal conditions. Inspired by the natural curling of a piece of foliage, we proposed a surfactant-free rolling mechanism to interpret the observed morphological evolution from lamellar to tubular structures. Based on these simple, practical, and green chemical synthetic routes, we can easily synthesize lamellar, scrolled, tubular, and clubbed Ag_2S crystals by simply adjusting the reaction temperature, pressure, and time. It is very interesting to note that the current rolling process is quite different from the previous reported rolling mechanism that highly depends on the surfactants; we revealed that the lamellar Ag_2S could be rolled into tubular structures without using any surfactant or other chemical additives, just like the natural rolling process of a piece of foliage. Therefore, this morphology-controlled synthetic route of Ag_2S crystals may provide new insight into the synthesis of metal sulfide semiconducting micro-anocrystals with desired morphologies for further industrial applications. The optical properties of the pentagonal Ag_2S nanoplates/film were also investigated by UV/Vis and photoluminescence (PL) techniques, which showed large blue-shift of the corresponding UV/Vis and PL spectra.
机译：通过一种简单而又简便的湿化学技术，无需使用任何表面活性剂，就可以在大面积的银箔表面上原位制作各种形状的Ag_2S晶体，包括叶状五边形纳米板，皱纹纳米卷，六角棱柱状微管和微棒。详细的实验表明，仅通过在室温和大气压下将银箔浸入硫/乙醇溶液中即可形成Ag_2S纳米板，随后将它们卷成纳米卷，并在溶剂热条件下进一步长成微管和微棒。受一片叶子自然卷曲的启发，我们提出了一种无表面活性剂的卷曲机制来解释观察到的从层状到管状结构的形态演变。基于这些简单，实用和绿色的化学合成路线，我们只需调整反应温度，压力和时间即可轻松合成层状，涡旋状，管状和棒状Ag_2S晶体。有趣的是，当前的轧制过程与先前报道的高度依赖于表面活性剂的轧制机理有很大不同。我们发现层状的Ag_2S可以不使用任何表面活性剂或其他化学添加剂即可轧制成管状结构，就像一片叶子的自然轧制过程一样。因此，这种由Ag_2S晶体的形貌控制的合成途径可能为合成具有所需形态的金属硫化物半导体微/纳米晶体提供新的见识，以用于进一步的工业应用。还通过UV / Vis和光致发光（PL）技术研究了五角形Ag_2S纳米板/薄膜的光学性能，该技术显示出相应的UV / Vis和PL光谱发生了较大的蓝移。

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