journal article·2018-04-27

Metal Charge Transfer Doped Carbon Dots with Reversibly Switchable, Ultra-High Quantum Yield Photoluminescence

Quan Xu, Rigu Su, Yusheng Chen, Sreeprasad Theruvakkattil Sreenivasan, Neng Li, Xusheng Zheng, Junfa Zhu, Haibin Pan, Weijun Li, Chunming Xu, Zhenhai Xia, Liming Dai

ACS Applied Nano Materials· Volume 1· Issue 4
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Abstract

As a class of the heteroatom-doped carbon materials, metal charge-transfer doped carbon dots (CDs) exhibited an excellent optical performance and were widely used as fluorescent probes. To improve fluorescence quantum yield (QY) remains one of the fundamental and challenging issues in the carbon dots field. Herein, we prepared a novel manganese doped CDs (Mn-CDs), which exhibited an ultrahigh quantum yield of 54%, the highest quantum yield for metal-doped CDs. Various spectroscopic measurements revealed an in situ change of dopant oxidation state during the synthesis. Our further study indicated the presence of metal–carbonate, which served as an important component for high quantum yield. We have also studied the reversibly switchable fluorescence property of Mn-CDs by adding Hg2+/S2–, as well as elucidating the underlying mechanism of this switching fluorescence phenomenon. By using the Mn-CDs as fluorescent probes, we developed an extremely sensitive detection method for heavy metal Hg2+ detection at a nM detection limit level.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Carbon and Quantum Dots Applications · Nanocluster Synthesis and Applications · Mercury impact and mitigation studies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Heavy Oil Processing, Beijing 102249, China

Department of Chemical Science, University of Akron, Akron, Ohio 44325, United States

Polymer Institute and Center for Material and Sensor Characterization, University of Toledo, Toledo, Ohio 43606, United States

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Hefei Science Center & National Synchrotron Radiation Laboratory, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China

Department of Materials Science and Engineering and Department of Chemistry, University of North Texas, Denton, Texas 76203, United States

Center of Advanced Science and Engineering for Carbon (Case4carbon), Department of Macromolecular Science Center of Advanced Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States,

Funding

Ministry of Science and Technology of the People's Republic of China · Beijing Nova Program · Science Foundation, China University of Petroleum

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