Chemicals: Cadmium oxide (99.995%, Aldrich), zinc oxide (≥99%, Aldrich), oleic acid (90%, technical grade, Aldrich), 1-Octadecene (90%,Aldrich), sulfur (99.998%, Aldrich), selenium (99.99%, Aldrich), trioctylphosphine (TOP, 97%, Aldrich), formamide (FA, spectroscopy grade, Aldrich), hexane (AR, S D Fine chem. Ltd), ammonium sulfide (40-48 wt% solution in water, Aldrich), toluene (99.5%, Rankem), ethanol (99.9% AR, S D Fine chem. Ltd), N,Ndimethyl formamide (DMF dry, S D Fine chem.),

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... nium tetrafluoroborate (95%, Aldrich), cadmium nitrate tetrahydrate (98%, Aldrich), zinc nitrate hexahydrate (98%, Aldrich), HEPES sodium salt (99.99%,Sigma), potassium nitrate (≥99%, Aldrich), nickel(II) nitrate hexahydrate (98%, Merck), cobalt(II) nitrate hexahydrate (≥97%, Merck), indium(III) nitrate hydrate (99.999%, Aldrich), manganese(II) nitrate hydrate (98%, Aldrich), iron(III) nitrate (≥98%, Merck), barium(II) nitrate (99%, Merck), magnesium nitrate hexahydrate (99.0%, S D Fine chem. Ltd), mercury(II) nitrate monohydrate (≥98%, Aldrich), lead(II) nitrate (≥ 99%, Aldrich), 3-Mercaptopropionic acid (MPA, ≥99%, Aldrich), toluene (99.8%,Aldrich), acetonitrile (dry, S D Fine chem. Ltd.), 4-nitrotoluene (99%, Aldrich), 2,4dinitrotoluene (2,4-DNT, 99%, Aldrich), 2,6-dinitrotoluene (2,6-DNT, 99%, Aldrich), 2,4,6-Electronic Supplementary Material (ESI) for ChemComm. This journal is