Reversible Modulation of the Electrostatic Potential of a Colloidal Quantum Dot through the Protonation Equilibrium of Its Ligands
作者： Chen He , Zhengyi Zhang , Chen Wang , Yishu Jiang , Emily A. Weiss
DOI: 10.1021/ACS.JPCLETT.7B02101
关键词:
摘要: This Letter describes the reversible modulation of electrostatic potential at interface between a colloidal PbS quantum dot (QD) and solvent, through protonation equilibrium QD’s histamine-derivatized dihydrolipoic acid (DHLA) ligand shell. The is sensitively monitored by yield photoinduced electron transfer from QD to charged acceptor, 9,10-anthraquinone-2-sulfonate (AQ). permeability DHLA coating AQ progressively increases as average degree shell 0 92%, quantified 1H NMR, upon successive additions p-toluenesulfonic acid; this increase results in decrease photoluminescence (PL) intensity QDs factor 6.7. attributable favorable interactions ligands AQ. work suggests combination near-IR-emitting molecular quenchers robust local H+ sensors.
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