Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543.
J Am Chem Soc. 2009 Dec 30;131(51):18293-8. doi: 10.1021/ja908131t.
We have successfully immobilized phosphotungstic acid (PTA), a polyoxometalate, on the surface of boron-doped diamond (BDD) surface through electrostatic self-assembly of PTA on pyridinium dye-functionalized-BDD. The inorganic/organic bilayer structure on BDD is found to exhibit fast surface-confined reversible electron transfer. The molecular dye-grafted BDD can undergo controllable electrical stripping and regeneration of PTA which can be useful for electronics or sensing applications. Furthermore, we have demonstrated the use of PTA as a molecular switch in which the direction of photocurrent from diamond to methyl viologen is reversed by the surface bound PTA. Robust photocurrent converter based on such molecular system-diamond platform can operate in corrosive medium which is not tolerated by indium tin oxide electrodes.
我们成功地通过在吡啶染料功能化的 BDD 上静电自组装，将多酸磷钨酸（PTA）固定在掺硼金刚石（BDD）表面上。发现在 BDD 上存在无机/有机双层结构，其表现出快速的表面受限可逆电子转移。分子染料接枝的 BDD 可以进行可控的电剥离和 PTA 的再生，这对于电子学或传感应用非常有用。此外，我们已经证明了 PTA 可用作分子开关，其中通过表面结合的 PTA 可以逆转来自金刚石到甲紫精的光电流方向。基于这种分子系统-金刚石平台的稳健光电流转换器可以在腐蚀性介质中运行，而氧化铟锡电极则无法耐受该介质。
