Choi Hyun Chul, Lee Sungkoo, Lee Kyeong K, Noda Isao, Park Chulhwan, Kwon Chan Ho, Jung Young Mee
Department of Chemistry, Chonnam National University, Gwangju 500-757, Republic of Korea.
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Apr;69(4):1110-3. doi: 10.1016/j.saa.2007.06.032. Epub 2007 Jul 6.
A promising possibility for the quantitative analysis of X-ray absorption near edge structure (XANES) spectra of nanosized electrode materials is demonstrated. We used a 2D map representation technique, which utilizes the values of the first derivatives of the absorbance with respect to the inserted Li(+) content plotted over the two-dimensional space defined by the inserted Li(+) content (mole) versus photon energy (eV) as a single map. The technique was applied to XANES spectra of the Li(y)CoO system in the first Li(+) insertion reaction for determining the structural and electronic variations associated with the change in Li(+) content. The obtained show that the intensities of two peaks at 7725 and 7711 eV increased with the Li(+) content and the difference of intensity change of these two peaks carried out for successive couples of spectra yielded the largest changes at 1.05 and 1.98 mol of Li content. This approach for quantitative analysis of XANES without using conventional simulation techniques enable us to interpret X-ray absorption spectroscopy (XAS) as a quantitative analytical technique with greater confidence.
展示了一种对纳米电极材料的X射线吸收近边结构（XANES）光谱进行定量分析的有前景的可能性。我们使用了一种二维图谱表示技术，该技术利用吸光度相对于插入的Li(+)含量的一阶导数的值，绘制在由插入的Li(+)含量（摩尔）与光子能量（电子伏特）定义的二维空间上，作为单个图谱。该技术应用于Li(y)CoO体系在首次Li(+)插入反应中的XANES光谱，以确定与Li(+)含量变化相关的结构和电子变化。结果表明，7725和7711 eV处的两个峰的强度随Li(+)含量增加，并且对连续几对光谱进行这两个峰强度变化的差异分析，在Li含量为1.05和1.98 mol时产生了最大变化。这种不使用传统模拟技术对XANES进行定量分析的方法，使我们能够更有信心地将X射线吸收光谱（XAS）解释为一种定量分析技术。
