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首页> 外文会议>Symposium on Microcrystalline and Nanocrystalline Semiconductors-1998 held November 30-December 3, 1998, Boston, Massachusetts, U.S.A. >Surface Stoichiometry of CdSe Nanocrystals
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Surface Stoichiometry of CdSe Nanocrystals

机译：CdSe纳米晶体的表面化学计量

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摘要

Rutherford backscattering spectroscop (RBS) has been applied to determine the constitution of prototypical CdSe nanocrystals synthesized by the high temperature pyrolysis of organometallics in trioctylphosphine oxide (TOPO). The diameter of the nanocrystals was varied from 22 A to 58 A. For all nanocrystal sizes the nanocrystals are Cd rich with an average Cd:Se ratio of 1.2 +-0.1. The Cd:Se stoichiometery is independent of the starting Cd:Se ratio used for nanocrystal preparation, indicating the excess Cd is not associated with the initial abundance but is an intrinsic property of nanocrystals prepared by this method. The size dependence of excess Cd indicates the extra Cd is on the surface of the crystallite. The coverage of the surface passivating TOPO ligands has also been determined and is larger than reported in previous X-ray photoelectron spectroscopy (XPS) studies of Bown Katari et al. The origin and structural implications of non-stoichoimetric Cd are discussed.
机译：卢瑟福背散射光谱仪（RBS）已用于确定通过有机金属在三辛基氧化膦（TOPO）中的高温热解合成的典型CdSe纳米晶体的组成。纳米晶体的直径在22 A至58 A之间变化。对于所有纳米晶体尺寸，纳米晶体都富含Cd，平均Cd：Se比为1.2 + -0.1。 Cd：Se的化学计量比与用于纳米晶体制备的起始Cd：Se比率无关，这表明过量的Cd与初始丰度无关，而是通过此方法制备的纳米晶体的固有特性。过量Cd的尺寸依赖性表明过量Cd在微晶表面上。还已经确定了表面钝化TOPO配体的覆盖范围，并且比Bown Katari等人先前的X射线光电子能谱（XPS）研究中报道的覆盖范围更大。讨论了非化学计量镉的起源和结构意义。

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