Preparation method for nano-particles with metal-carbon core-shell structures

Abstract

The invention discloses a preparation method for nano-particles with metal-carbon core-shell structures. The preparation method comprises the steps of: firstly adding a metal target into an organic solution; introducing inert gas; ablating the metal target by using a laser device under a stirring condition; then adding the obtained laser-ablated product into a sulfuric acid solution; introducing the inert gas; heating and stirring the solution; and cooling the solution to obtain the nano-particles with metal-carbon core-shell structures. The preparation method disclosed by the invention is simple in process, fast, good in repeatability and green and pollution-free; and the obtained nano-particles with metal-carbon core-shell structures are high in purity and uniform in shape, carbon fluorescence is enhanced, and the nano-particles can be regulated.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing metal-carbon core-shell nanoparticle. Background technique [0002] As a nano-fluorescent material, carbon dots have excellent fluorescence properties such as tunable excitation wavelength and emission wavelength, good biocompatibility, low toxicity, stable fluorescence, resistance to photobleaching, and no light flickering phenomenon. By enhancing the fluorescence intensity of carbon dots, it can be applied to enhance surface Raman, enhance photodetector signals and biological imaging. [0003] At present, the methods for preparing fluorescent carbon dots mainly include electrochemical method, microwave synthesis method, hydrothermal method and laser ablation method. Literature (H.T.Li, X.D.He, Z.H.Kang, H.Huang, Y.Liu, J.L.Liu, S.Y.Lian, C.H.A.Tsang, X.B.Yang and S.T.Lee, Angew.Chem., Int.Ed., 2010, 49, 4430 ) The fluorescent car...

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Problems solved by technology

Literature (H.T.Li, X.D.He, Z.H.Kang, H.Huang, Y.Liu, J.L.Liu, S.Y.Lian, C.H.A.Tsang, X.B.Yang and S.T.Lee, Angew.Chem., Int.Ed., 2010, 49, 4430 ) The fluorescent carbon dots are prepared by electrochemically exfoliating the graphite honeycomb layer. The prepared fluorescent carbon dots have high purity, controllable size, and high yield. cause environmental pollution

In the literature (X.H.Wang, K.G.Qu, B.L.Xu, J.S.RenandX.G.Qu, J.Mater.Chem., 2011, 21, 2445.), the microwave synthesis method is used to prepare fluorescent carbon dots in one step, which does not require surface passivation agent, mild and low cost, but the shape and particle size of carbon quantum dots are not easy to control

Literature (J.M.Wei, X.Zhang, Y.Z.Sheng, J.M.Shen, P.Huang, S.K.Guo, J.Q.Pan, B.T.Tao, B.X.Feng, New.J.Chem., 2014, 38, 906.) prepared fluorescent carbon by hydrothermal method The carbon dots show good photostability and high fluorescence quantum yield, but the particle size of carbon quantum dots prepared by this method is not easy to control

Literature (K.Habiba, V.I.Makarov, J.Avalos, M.J.F.Guinel, B.R.Weiner and G.Morell, Carbon, 2013, 64, 341-350.) used laser ablation to prepare fluorescent carbon dots, the experimental process was fast and pollution-free, and the product was of high purity. But the particle size of the product is not easy to control, and the fluorescence yield of carbon quantum dots is low

At present, there is no simple method that can quickly and greenly prepare fluorescent carbon quantum dots, enhance the ultraviolet light emission of carbon quantum dots, and adjust the fluorescence intensity of enhanced carbon dots.

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