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Graphene quantum dots derived from hollow carbon nano-onions

nano Research 2018年第1期11卷 174-184页

作者： Chenguang Zhang Jiajun LI Xianshun Zeng Zhihao Yuan Naiqin Zhao [1School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China [2School of Materials Science and Engineering Tianin University Tianin 300072 China [3Tianjin Key Lab for Photoelectric Materials & Devices Tianjin 300384 China [4Collaborative Innovation Center of Chemical Science and Engineering Tianjin University Tianjin 300072 China

Herein, carbon nano-onions （CNOs） with different structures have been investigated as precursors for the synthesis of graphene quantum dots （GQDs）. It was found that hollow CNOs yield GQDs with a uniform size distribution, whereas metal encapsulation in the CNO structure is disadvantageous for the same. Furthermore, the hollow CNOs are also advantageous for the synthesis of GQDs with a yellow-green hybrid luminescence and long-ranged excitation wavelength （λex）-independent photoluminescent （PL） behavior, in which the λex upper limit was 480 nm. These features enable safe sensing and cell tracking applications with a longer excitation wavelength in the visible light region. The potential applications of the synthesized GQDs as fluorescent sensing probes for detecting Cu（II） ions and non-toxic cell imaging under visible light excitation have been demonstrated. This means that sensing and bioimaging can be accomplished in the natural environment with no need for UV excitation. This work provides a reference to researchers in tailoring CNO structures in terms of their inner space to synthesize GQDs with the desired luminescence behavior.

关键词： graphene quantum dots carbon nano-onions fluorescent quenching bioimaging

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The synthesis of carbon microspheres film composed of nano-onions and its application as flexible supercapacitors

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carbon Energy 2021年第3期3卷 509-518页

作者： Miao Zhang Naiqin Zhao Xifei Li Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials School of Physics and Materials ScienceTianjin Normal UniversityTianjinChina Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjinChina

Flexible electrodes with superior mechanical and electrochemical properties are essential for flexible supercapacitors.A convenient and scalable colloidal film-assisted chemical vapor deposition(CF-CVD)method is developed for the one-step fabrication of the carbon microspheres films composed of carbon nano-onions(CMS-CNO films).The influence of growth conditions(such as growth temperature,time,and gas ratio)during CF-CVD process on the carbon structures and the growth mechanism of the CMS-CNO films have been *** controlling the growth conditions,the controllable preparation of CMS-CNO films is *** binder-free films can be used for the assembly of flexible supercapacitors,and unique architecture can achieve excellent *** from the composite of nano-micro zero dimensional structures,the performance of the film in supercapacitors is remarkably *** the current density of 5 mA cm^(-2),the area-specific capacity can be 903 mF cm^(-2).When the current density is increased to 500 mA cm^(-2),the area-specific capacity can be increased to 729 mF cm^(-2).This simple and low-cost preparation process and the superb electrochemical performance suggest great potential applications of CMS-CNO films in flexible supercapacitors.

关键词： carbon nano-onions composite films flexible supercapacitors

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