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Zhao F.,Beijing Institute of Technology | Li Z.,Beijing Institute of Technology | Wang L.,Beijing Institute of Technology | Hu C.,Beijing Institute of Technology | And 4 more authors.
Chemical Communications | Year: 2015

We report the biodegradable supramolecular quantum dots (SQDs) of hydrogen-bonded graphitic carbon nitride (g-C3N4) with low cytotoxicity and desirable biocompatibility for promising upconversion-enabled fluorescent bio-probes. A remarkable biodegradation of up to 97% within 24 hours is presented. This journal is © The Royal Society of Chemistry 2015.

Wang W.,Key Laboratory of Cluster Science | Xiao Y.,Key Laboratory of Cluster Science | Zhao X.,Key Laboratory of Cluster Science | Liu B.,Key Laboratory of Cluster Science | And 2 more authors.
CrystEngComm | Year: 2014

Novel Cd2SnO4-SnO2 hybrid micro-cubes assembled from fine nanoparticles were successfully prepared through a facile hydrothermal method followed by thermal treatment. The NH4F used in our experiment plays an important role in the formation of the Cd 2SnO4-SnO2 micro-cubes. When configured as an anode material for lithium-ion batteries (LIBs), the micro-cubic Cd 2SnO4-SnO2 hybrid exhibited an enhanced reversible capacity of 523.4 mAh g-1 at 100 mA g-1 after 25 cycles compared to pristine Cd2SnO4 and SnO 2. These results indicate that this hybrid can be a promising anode candidate for LIBs. The improved electrochemical performance of the Cd 2SnO4-SnO2 hybrid may in general be attributed to the synergetic effect of the small diffusion length in the nanoparticle building blocks as well as the hybrid structural features. © 2014 The Royal Society of Chemistry.

Liu B.,Beijing Key Laboratory of Photoelectronic Electrophotonic Conversion Materials | Zhao X.,Beijing Key Laboratory of Photoelectronic Electrophotonic Conversion Materials | Xiao Y.,Beijing Key Laboratory of Photoelectronic Electrophotonic Conversion Materials | Cao M.,Beijing Key Laboratory of Photoelectronic Electrophotonic Conversion Materials
Journal of Materials Chemistry A | Year: 2014

In this work, we report the feasibility to achieve high lithium storage performance of MoOx by controlling its microstructure including specific surface area, doping, and amorphous structure. High-surface-area F-doped amorphous MoOx (a-MoOx) is synthesized by hydrothermal hydrolysis of ammonium molybdate tetrahydrate in a water-ethylene glycol (H2O-EG) mixed solvent. The resultant a-MoOx has a surface area as high as 212.74 m2 g-1 and exhibits a hierarchically microporous-mesoporous structure. The electrochemical measurements demonstrate that the high-surface-area F-doped a-MoOx exhibits high capacity and excellent electrochemical stability when used as an anode material for lithium-ion batteries. Some synergistic factors including F-doping, high specific surface area, and porous structure, may be responsible for the good lithium-storage performance. © The Royal Society of Chemistry.

Wang J.-L.,Beijing Key Laboratory of Photoelectronic Electrophotonic Conversion Materials | Wu Z.,Beijing Key Laboratory of Photoelectronic Electrophotonic Conversion Materials | Miao J.-S.,South China University of Technology | Liu K.-K.,Beijing Key Laboratory of Photoelectronic Electrophotonic Conversion Materials | And 4 more authors.
Chemistry of Materials | Year: 2015

A family of narrow band gap extended conjugated D2-A2-D1-A1-D1-A2-D2 type small molecules based on diketopyrrolopyrrole derivatives as the stronger acceptor core (A1) coupled with indacenodithiophene (IDT; D1) and difluorobenzothiadiazole (A2) are synthesized, and their properties as donor materials in solution-processed small-molecule organic solar cells are investigated. The impacts of replacing the thiophene ring by a more electron-deficient thiazole ring and inserting thiophene spacer between electron-donating (D1) and electron-accepting (A1 and A2) aromatic moieties on bulk properties, such as the photophysical properties, the HOMO/LUMO energy level, charge carrier mobilities, and the morphologies of blend films, as well as optimization on device performance via solvent vapor annealing are investigated. NDPPFBT shows outstanding efficiencies up to 7.00% after THF vapor annealing for 60 s because of a very high fill factor (FF) of 0.73 and high Voc of 0.89 V. The reported efficiency is among one of the highest values for small-molecules-based organic solar cells from an electron-accepting unit as core and appears as the first diketopyrrolopyrrole-based small-molecule bulk-heterojunction organic solar cells with PCE over 7% with high FF and Voc. © 2015 American Chemical Society.

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