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It is still a challenging issue to achieve efficient and tunable fluorescent carbon dot (CD) powders. Herein, we report a novel and general solvothermal strategy to in-situ embedding CDs in trisodium citrate crystal matrix, and these CDs exhibit tunable emission from green to yellow and a high quantum yield up to 21.6% in solid state, comparable to that in solution. This intriguing fluorescence phenomenon...
Horizontally aligned single-walled carbon nanotube (SWNT) arrays are of great importance for building nanoelectronics devices and integrate circuits. We developed a method to grow SWNT arrays uniformly distributed all over the quartz substrate. Instead of pre-patterning catalysts on the substrates, Cu are evaporated under the reductive atmosphere of H2 and nucleate on the surface of quartz to form...
Free-standing two-dimensional MnO2/carbon sphere/graphene (MCG) films are rationally designed and used as efficient electrode materials for supercapacitor. Carbon sphere/graphene (CG) films are firstly constructed through a simple vacuum filtration method, then MCG electrodes are prepared by simply floating CGs on KMnO4 solution at room temperature. CG films act as the reducing agents as well as freestanding...
The ordered three-dimensional arrays conjugative polyaniline–graphene composites were fabricated through in-situ chemical oxidative polymerization of aniline in the presence of amino-functionalized graphene sheets (AFG), in which polyaniline (PANI) polymerization is initiated by those amino groups on graphene. Therefore, the resulting PANI nanorod arrays are integrated into a large conjugative frame...
It is normally assumed that the sheet resistances under and outside the metal contact are identical when deriving specific contact resistivity of graphene from transmission line model. We considered the contact end resistance and obtained the sheet resistance under contact of 670Ω/□, which is much different from that outside the contact of 1840Ω/□. Considering the difference, the value of specific...
Using a random polymerization process on graphene oxide (GO), graphene oxide grafted with oligomers containing phosphorylcholine moieties (GO-PCn) was synthesized. The synthesis products were characterized by atomic force microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis and X-ray diffraction. The results revealed...
Pt–Cu/reduced graphene oxide (Pt–Cu/RGO) hybrids with different Pt/Cu ratios were prepared by the reduction of H 2 PtCl 6 and CuSO 4 by NaBH 4 in the presence of graphene oxide (GO). The Pt–Cu nanoparticles were characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The reduction of GO was verified by ultraviolet–visible...
Graphene oxide (GO) aerogels were prepared by a unidirectional freeze-drying method (UFDM), their structure was observed and their adsorption performance for Cu 2+ in aqueous solution was evaluated. The results show that GO aerogels have unidirectional porous structure and good adsorption ability for Cu 2+ . The adsorption system is depended on the Cu 2+ concentration and follows...
An environment-friendly approach to synthesizing reduced graphene oxide (RGO) was developed by using chitosan (CS) as both a reducing and a stabilizing agent. Factors that affect the reduction of graphene oxide (GO), such as the ratio of CS/GO, pH and temperature, were explored to obtain optimum reaction conditions. The RGO was characterized with UV visible absorption spectroscopy, Fourier transform...
Mesoporous carbon was prepared from resol-type phenol-formaldehyde resin using mesoporous silica as template. By filling the resin into the pores of the template, followed by resin carbonization and template dissolution, mesoporous carbon preparation can be significantly simplified. Small-angle X-ray diffraction reflected the long-range ordering of the pores in the carbon. TEM and N 2 -adsorption...
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