Controlling the work function of indium tin oxide: Differentiating bipolar from local surface effects
Controlling the work function of indium tin oxide: Differentiating bipolar from local surface effects
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DOI：
10.1021/ja012316s
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发表时间：
2002-04-03
影响因子：
15
通讯作者：
Schwartz, J
中科院分区：
文献类型：
--
作者：
Bruner, EL;Koch, N;Schwartz, J
氧化铟锡（ITO）与四（叔丁氧基）锡反应，得到表面结合的烷氧基锡物种。配体交换发生在这些表面结合的物种通过与取代的酚反应。通过X射线光电子能谱法在真空中测量了表面酚盐的形态，以及表面改性的ITO的功函数。结果表明，苯酚的分子偶极矩与测得的ITO功函数变化强烈相关;苯酚的酸度与测得的功函数变化之间不存在这种相关性。结果是一致的，因此与静电模型，而不是与一个涉及电负性的连接酚氧。
Indium tin oxide (ITO) reacts with tetra(tert-butoxy)tin to give surface bound alkoxytin species. Ligand exchange occurs in these surface bound species by reaction with substituted phenols. The speciation of surface phenoxides was measured in ultrahigh vacuum by X-ray photoelectron spectroscopy, as was the work function for the surface modified ITO. It is shown that the molecular dipole moment of the phenol correlates strongly with the measured ITO work function change; no such correlation exists between the acidity of the phenol and this measured change in work function. Results are consistent therefore with an electrostatic model and not with one involving electronegativities of the ligated phenoxide oxygens.