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The evolution of pseudo-spherical silicon nanocrystals to tetrahedra, mediated by phosphonic acDE surfactants

机译：膦酸acDE表面活性剂介导的伪球形硅纳米晶体向四面体的演化

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摘要

Silicon nanocrystals were synthesized at high temperatures and high pressures by the thermolysis of diphenylsilane using a combination of supercritical carbon dioxDEe and phosphonic acDE surfactants. Size and shape evolution from pseudo-spherical silicon nanocrystals to well-faceted tetrahedral-shaped silicon crystals with edge lengths in the range of 30-400 nm were observed with sequentially decreasing surfactant chain lengths. The silicon nanocrystals were characterized by transmission electron microscopy (TEM), energy-dispersive x-ray spectroscopy (EDX), x-ray diffraction (XRD), photoluminescence (PL), scanning electron microscopy (SEM) and Raman scattering spectroscopy.
机译：硅纳米晶体是在高温和高压下通过结合使用超临界碳dioxDEe和膦酸acDE表面活性剂对二苯基硅烷进行热解而合成的。随着表面活性剂链长度的逐渐减小，观察到了从准球形硅纳米晶体到边长在30-400 nm范围内的多面体四面体形硅晶体的尺寸和形状演变。硅纳米晶体的特征在于透射电子显微镜（TEM），能量色散X射线光谱（EDX），X射线衍射（XRD），光致发光（PL），扫描电子显微镜（SEM）和拉曼散射光谱。

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