Orangnic Molecule Functionalized Metal Nanocomposites: Preparation And Photocatalysis

Pt nanocomposites functionalized by porphyrin and phthalocyanine molecules were prepared, characterized and using the nanocomposites as photocatalyst for water splitting. Several photocatalysis reaction systems were carried out to investigate the influence of the photosensitizer to the photocatalytic activities.(1) Meso-tetrakis(p-sulfonatophenyl)porphyrin (TPPS4) functionalized platinum nanocomposites (Pt-TPPS4) were synthesized and characterized using UV–vis, FL, FTIR, TEM and XRD methods. The postulated configuration of Pt-TPPS4 may be described as an antenna system containing a photoreceptive TPPS4 shell and a nanosize platinum core. Fluorescence and photoelectrochemistry studies of both TPPS4 and the platinum nanocomposites showed that efficient electron/energy transfer occurred from the TPPS4 donor to the metallic nanocore acceptor. The diameter of the nanocomposites rang from 2-5 nm depending on the molar ratio of Pt and TPPS4. The amount of H2 is related to the molar ratio of Pt/TPPS4 and the amount of catalyst and so on. TPPS4 functionalized platinum nanocomposites show high stability and activity for water reduction to produce hydrogen.(2) Copper(II) phthalocyanine tetrasulfonate (CuPcTs) sensitized platinum nanocomposites (Pt-CuPcTs) were synthesized and characterized using UV–vis, FL, FTIR, TEM and XRD methods. The postulated configuration of Pt-CuPcTs may be described as an antenna system containing a photoreceptive CuPcTs shell and a nanosize platinum core. CuPcTs can contact with Pt atoms directly through sulphonato groups which in favor of efficiency energy transfer. CuPcTs functionalized platinum nanocomposites are photocatalytic active for water splitting to produce hydrogen. The amount of H2 is maximal when the molar ration of Pt/CuPcTs is 300; superfluous EDTA will go against H2 evolution. TPPS4 also would influence hydrogen evolution when Pt-CuPcTs employed as photocatalyst.(3) Manganese meso-tetrakis(p-sulfonatophenyl)porphyrin (MnTPPS4) functionalized platinum nanocomposites (Pt-MnTPPS4) were synthesized and characterized using UV–vis, FL, FTIR, TEM and XRD methods. MnTPPS4 molecules contact with Pt atoms directly through sulphonato groups. The diameters of Pt-MnTPPS4-100 and Pt-MnTPPS4-250 are 1.1±0.2 nm and 2.2±0.4 nm, respectively. Pt nanoparticles stabilized by MnTPPS4 show high stability in the photocatalytic reaction. When Pt-MnTPPS4 served as photocatalyst, the amount of H2 is larger in absence of EDTA than in the presence of EDTA.