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Ammonium-modified MoS 2 and WS 2 were prepared and characterized by complementary spectroscopic, thermal, and microscopic means. The positive charges on functionalized MoS 2 and WS 2 , due to the presence of ammonium units, were exploited to electrostatically bring in contact an anionic porphyrin bearing a carboxylate moiety, yielding porphyrin/MoS 2 and porphyrin/WS 2 ensembles, 5a and 5b, respectively. Efficient photoluminescence quenching of porphyrin's emission by MoS 2 and WS 2 within nanoensembles 5a and 5b, in combination with time-resolved photoluminescence assays, revealed transduction of energy from the photoexcited porphyrin to MoS 2 or WS 2 .

Electrostatic Association of Ammonium-Functionalized Layered-Transition-Metal Dichalcogenides with an Anionic Porphyrin