Ahmad Kafeel, Gogoi Sonit Kumar, Begum Raihana, Sk Md Palashuddin, Paul Anumita, Chattopadhyay Arun
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
Department of Chemistry, Gauhati University, Guwhati, Assam, India.
Chemphyschem. 2017 Mar 17;18(6):610-616. doi: 10.1002/cphc.201601249. Epub 2017 Jan 25.
Herein we report the photoinduced electron transfer from Mn -doped ZnS quantum dots (Qdots) to carbon dots (Cdots) in an aqueous dispersion. We also report that the electron transfer was observed for low pH values, at which the oppositely charged nanoparticles (NPs) interacted with each other. Conversely, at higher pH values the NPs were both negatively charged and thus not in contact with each other, so the electron transfer was absent. Steady-state and time-resolved photoluminescence studies revealed that interacting particle conjugates were responsible for the electron transfer. The phenomenon could be used to detect the presence of Cu ions, which preferentially, ratiometrically, and efficiently quenched the luminescence of the Qdots.
在此，我们报道了在水分散体系中，光诱导电子从锰掺杂的硫化锌量子点（Qdots）转移至碳点（Cdots）的过程。我们还报道了在低pH值下观察到电子转移，此时带相反电荷的纳米粒子（NPs）相互作用。相反，在较高pH值下，纳米粒子均带负电荷，因此彼此不接触，所以不存在电子转移。稳态和时间分辨光致发光研究表明，相互作用的粒子共轭物是电子转移的原因。该现象可用于检测铜离子的存在，铜离子能优先、按比例且有效地淬灭量子点的发光。
