TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The photocatalytic capped colloidal nanocrystals comprise a metal doped compounds such as e.g. ZnS.TiO2, TiO2.CuO, ZnS.RuOx, ZnS.ReOx, Au.AsS3, Au.Sn2S6, Au.SnS4, Au.Sn2Se6, Au.In2Se4, Bi2S3.Sb2Te5, Bi2S3.Sb2Te7, Bi2Se3.Sb2Te6, Bi2Se3.Sb2Te7, CdSe.Sn2S6, CdSe.Sn2Te5, CdSe.In2Se4, CdSe.Ge2S6, CdSe.Ge2Se3, CdSe.HgSe2, CdSe.ZnTe, CdSe.Sb2S3, CdSe.SbSe4, CdSe.Sb2Te7, CdSe.In2Te3, CdTe.Sn2S6, CdTe.Sn2Te6, CdTe.In2Se4, Au/PbS.Sn2S6, Au/PbSe.Sn2S6, Au/PbTe.Sn2S6, Au/CdS.Sn2S6, Au/CdSe.Sn2S6, Au/CdTe.Sn2S6, FePt/PbS.Sn2S6, FePt/PbSe.Sn2S6, FePt/PbTe.Sn2S6, FePt/CdS.Sn2S6, FePt/CdSe.Sn2S6, FePt/CdTe.Sn2S6, Au/PbS .SnS4, Au/PbSe.SnS4, Au/PbTe.SnS4, Au/CdS .SnS4, Au/CdSe. SnS4, Au/CdTe.SnS4, FePt/PbS.SnS4 FePt/PbSe.SnS4, FePt/PbTe.SnS4, FePt/CdS .SnS4, FePt/CdSe.SnS4, or FePt/CdTe.SnS4. The photocatalytic capped colloidal nanocrystals include a second semiconductor nanocrystal capped with a second inorganic capping agent, the first inorganic capping agent acts as a reduction photocatalyst, and the second inorganic capping agent acts as an oxidation photocatalyst. The plasmonic nanoparticles include a noble metal. The plasmonic nanoparticles are gold plasmonic nanoparticles, and the gold plasmonic nanoparticles are embedded in silicon dioxide/titanium dioxide thin film.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The reduction system further comprises a heater that heats the reaction vessel. The water vapor permeable membrane is a polydimethyl siloxane membrane. The methane-permeable membrane is a polymide resin membrane.The morphology of the photocatalytic capped colloidal nanocrystals comprises a morphology from a group consisting of a core/shell configuration, a nanowire configuration, and a nanospring configuration. The system further comprises ligands forming a nanojunction between the plasmonic nanoparticles and the photocatalytic capped colloidal nanocrystals. The ligand includes an amine-containing compound and a ketone or alcohol containing compound.