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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Mineralizer-Assisted Shape-Controlled Synthesis, Characterization, and Photocatalytic Evaluation of CdS Microcrystals
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Mineralizer-Assisted Shape-Controlled Synthesis, Characterization, and Photocatalytic Evaluation of CdS Microcrystals

机译：矿化剂辅助形状控制的CdS微晶的合成，表征和光催化评估

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摘要

High-quality, well-crystallized, single-crystal, wurtzite CdS hexagonal microtowers (with and without tubular structure) and CdS with octahedral geometry were successfully synthesized by tuning the solvent ratio of water and ethanol for the first time on a large scale without using any catalysts or templates. The products were characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectrometry, transmission electron microscopy, and field emission scanning electron microscopy. CdS with microtowers, octahedral geometry, and hexagonal plates was formed by thermal decomposition of cadmium thiocyanate at 400 °C under open atmospheric conditions. The influence of solvent, initial precursor concentration, decomposition temperature, and time on the morphology of CdS was investigated, and the results were discussed. The XRD results showed that the cadmium thiocyanate complex is completely decomposed into CdS at 300 °C for 2 h and the wurtzite phase was formed under all experimental conditions, which opens a door for well-crystallized, single-phase CdS synthesis on a large scale. The diffuse reflectance spectra showed that CdS microtowers have strong, visible light absorption compared with the octahedral geometry, revealing the existence of a profound shape-property relationship of CdS. The CdS microtowers with a Pt cocatalyst showed a high rate of photocatalytic hydrogen production from water containing 0.1 M Na2S and 0.1 M Na2SO3 as sacrificial reagents under visible light irradiation (λ ≥400 nm). The possible growing mechanism of various types of the CdS morphology was also discussed.
机译：通过不调节水和乙醇的溶剂比例就可进行大规模的首次调节，成功地合成了高质量，结晶良好的单晶纤锌矿型CdS六角形六方塔（有无管状结构）和具有八面体几何形状的CdS。任何催化剂或模板。通过X射线衍射（XRD），能量色散X射线光谱法，透射电子显微镜和场发射扫描电子显微镜对产物进行表征。带有微塔，八面体几何形状和六边形板的CdS是通过在开放的大气条件下于400°C时热分解硫氰酸镉而形成的。研究了溶剂，初始前驱体浓度，分解温度和时间对CdS形态的影响，并讨论了结果。 XRD结果表明，硫氰酸镉络合物在300°C下2 h完全分解成CdS，并且在所有实验条件下均形成纤锌矿相，这为大规模结晶，单相CdS合成打开了大门。 。漫反射光谱表明，与八面体几何形状相比，CdS微型塔具有较强的可见光吸收能力，这表明CdS的形状与属性之间存在着深厚的关系。带有Pt助催化剂的CdS微型塔在可见光（λ≥400nm）照射下，从作为牺牲试剂的0.1 M Na2S和0.1 M Na2SO3的水中显示出高的光催化氢产生速率。还讨论了各种类型的CdS形态的可能生长机理。

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