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首页> 外文会议>Fullerenes and Nanotubes: The Building Blocks of Next Generation Nanodevices: Fullorenes >Study on Electron-Transfer Systems of Colloidal TiO_2 Sensitized by Fullerenes Pending Carboxylic Acid Groups in the Presence of Methyl Viologen and Amines
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Study on Electron-Transfer Systems of Colloidal TiO_2 Sensitized by Fullerenes Pending Carboxylic Acid Groups in the Presence of Methyl Viologen and Amines

机译：在甲基紫精和胺存在下富勒烯使羧酸基与羧基致敏的胶体TiO_2电子转移体系的研究

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The electron-transfer systems of colloidal TiO_2 sensitized by fullerenes pending the carboxylic acid groups (C_(60)R), which were adsorbed on TiO_2, have been studied by steady-state visible-light irradiation and laser flash photolysis methods. Accumulation of MV~(·+) was observed in the course of the visible light irradiation exciting C_(60)R in the system containing a donor amine (p-anisidine; PAD), C_(60)R, TiO_2, methyl viologen (MV~(2+)), and a sacrificial amine (triethanolamine; TEOA). In the transient absorption spectra measured by nanosecond laser flash photolysis, the absorption peaks of ~3C_(60)R~*, C_(60)R~(·-) and MV~(·+) were successively observed. From the absorption time-profiles, it was confirmed that initial electron transfer takes place from PAD to ~3C_(60)R~*, producing C_(60)R~(·-)and PAD~(·+). In the presence of TiO_2, the electron injection takes place from C_(60)R~(·-) into TiO_2, giving TiO_2(e~-), when the reduction potential (E_(red)) of C_(60)R was more negative than that of TiO_2. MV~(2+) accepts the electron from TiO_2(e~-) giving MV~(·+). For C_(60)R with less negative E_(red) value than that of TiO_2, the back electron transfer from C_(60)R~(·-) to PAD~· was retarded by TiO_2; thus, the electron mediating from C_(60)R~(·-) to MV~(2+) may competitively become predominant, accumulating MV~(·+). Back electron transfer from MV~(·+) to PAD~(·+) was further retarded by TEOA via the rapid consumption of PAD~(·+).
机译：通过稳态可见光照射和激光闪光光解方法研究了富勒烯对羧基吸附的羧酸（C_（60）R）致敏的胶体TiO_2的电子传递系统。在含有供体胺（对-茴香胺; PAD），C_（60）R，TiO_2，甲基紫精的可见光辐照激发C_（60）R的过程中观察到MV〜（·+）的积累MV〜（2+））和牺牲胺（三乙醇胺; TEOA）。在通过纳秒激光闪光光解法测量的瞬态吸收光谱中，依次观察到〜3C_（60）R〜*，C_（60）R〜（·-）和MV〜（·+）的吸收峰。从吸收时间曲线，证实了初始电子从PAD发生转移到〜3C_（60）R〜*，产生了C_（60）R〜（·-）和PAD〜（·+）。在TiO_2存在下，当C_（60）R的还原电位（E_（red））为0时，电子从C_（60）R〜（·-）注入TiO_2，得到TiO_2（e〜-）。比TiO_2更负面。 MV〜（2+）接收来自TiO_2（e〜-）的电子，得到MV〜（·+）。对于负E_（red）值小于TiO_2的C_（60）R，TiO_2阻止了从C_（60）R〜（·-）到PAD〜·的反向电子转移；因此，从C_（60）R〜（·-）到MV〜（2+）的电子可能竞争性地占据主导地位，从而积累了MV〜（·+）。 TEOA通过快速消耗PAD〜（+）进一步阻止了从MV〜（·+）到PAD〜（·+）的反向电子转移。

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