Structural disorder in colloidal InAs and CdSe nanocrystals observed by X-ray absorption near-edge spectroscopy
Structural disorder in colloidal InAs and CdSe nanocrystals observed by X-ray absorption near-edge spectroscopy
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DOI：
10.1103/physrevlett.83.3474
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发表时间：
1999-10-25
影响因子：
8.6
通讯作者：
Alivisatos, AP
中科院分区：
文献类型：
--
作者：
Hamad, KS;Roth, R;Alivisatos, AP
我们报道了用x射线吸收近边光谱（XANES）在直径为17-80埃的InAs和CdSe纳米晶体中观察到尺寸依赖的结构紊乱。in和Cd M-4、M-5边缘的XANES产生的特征对于大块固体来说是尖锐的，但随着颗粒尺寸的减小而显着变宽。FEFF7多次散射模拟再现了球形纳米晶体模型的体状表面重构时光谱的尺寸依赖性展宽。这说明XANES对包括表面在内的整个纳米晶体的结构都很敏感。
We report the observation of size dependent structural disorder by x-ray absorption near-edge spectroscopy (XANES) in InAs and CdSe nanocrystals 17-80 Angstrom in diameter. XANES of the in and Cd M-4,M-5 edges yields features that are sharp for the bulk solid but broaden considerably as the size of the particle decreases. FEFF7 multiple-scattering simulations reproduce the size dependent broadening of the spectra if a bulklike surface reconstruction of a spherical nanocrystal model is included. This illustrates that XANES is sensitive to the structure of the entire nanocrystal including the surface.