Surface states of titanium dioxide nanoparticles modified with enediol ligands
Surface states of titanium dioxide nanoparticles modified with enediol ligands
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DOI：
10.1021/jp054128k
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发表时间：
2006-01-19
影响因子：
3.3
通讯作者：
Rajh, T
中科院分区：
文献类型：
--
作者：
de la Garza, L;Saponjic, ZV;Rajh, T
使用2-（3，4-二羟基苯基）乙胺（多巴胺）和3，4-二氢苯乙酸，它作为配体的欠配位表面位点（载体陷阱）的二氧化钛纳米粒子的表面状态的控制，证明了通过电化学技术。最深的陷阱被认为是最具反应性的，并选择性地除去通过添加的配体，这增强了在膜中的电子积累的动力学。此外，在费米能级的位移到更积极的电位检测与带负电荷的配体（3，4-二氢苯乙酸）修饰的电极相比，与带正电荷的配体（多巴胺）修饰的电极。配体上的负电荷的存在也有助于在3，4-二氢苯乙酸修饰电极上的析氢的欠电位。
Control of surface states of titanium dioxide nanoparticles using 2-(3,4-dihydroxyphenyl)ethylamine (dopamine) and 3,4-dihydrophenylacetic acid, which act as ligands to the undercoordinated surface sites (carrier traps), is demonstrated by electrochemical techniques. The deepest traps were found to be most reactive and are selectively removed by the addition of the ligands which enhances the kinetics of electron accumulation in the film. Furthermore, a shift in the Fermi level to more positive potentials was detected for electrodes modified with the negatively charged ligand (3,4-dihydrophenyl acetic acid) compared to that of electrodes modified with the positively charged ligand (dopamine). The presence of the negative charge on the ligand also contributed to the underpotential of hydrogen evolution on 3,4-dihydropheny I acetic acid-modified electrodes.