Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Water-dispersible CdSe@CdS semiconductor nanorods, which may act as photosensitizer in the hydrogen evolution reaction, are readily available by using 11-mercaptoundecanoic acid (MUA) as surface ligand. However, their colloidal instability at acidic values presents a drawback for their application under real conditions. Another disadvantage of MUA is hole trapping induced by the thiol group binding to the surface, reflected in decreased photoluminescence.
In this work, we aim to increase the colloidal stability of water-dispersible nanorods in a wide range of pH values. We employed different kinds of capping ligands, namely dihydrolipoic acid–polyethylene glycol (DHLA–PEG), mercaptopolyethylene glycol monomethyl ether (PEG–SH), and polyethyleneimine (PEI). Nanorods capped with PEI showed a comparatively high photoluminescence quantum yield (PLQY) in water, but were unstable at acidic pH, while nanorods capped with DHLA-PEG demonstrated the opposite behaviour: excellent colloidal pH stability but poor PLQY in pure water. Only nanorods with PEG–SH as surface ligands exhibited both good colloidal stability and reasonable PLQY in water and both neutral and acidic buffer solution. Further, to elucidate the exciton relaxation behaviour in nanorods with different surface functionalization, time-resolved photoluminescence and transient absorption measurements are performed.
Financial support is acknowledged by China Scholarship Council (CSC), the German Research Foundation (DFG) –project number 364549901 - TRR234 [CataLight, B4)] and the Fonds der Chemischen Industrie (FCI).
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