Electrostatically self-assembled polyoxometalates on molecular-dye-functionalized diamond.
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.
Zhong
Yu Lin
YL
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543.
Ng
Wibowo
W
Yang
Jia-Xiang
JX
Loh
Kian Ping
KP
D001895:Boron; D004396:Coloring Agents / Q000737:chemistry*; D018130:Diamond / Q000737:chemistry*; D010269:Paraquat; D055672:Static Electricity; D017973:Tungsten Compounds / Q000737:chemistry*; D000099294:Polyoxometalates
D001895:Boron; D004396:Coloring Agents; D018130:Diamond; D010269:Paraquat; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates