A kind of acicular nano-silver/nitrogen-doped graphene composite material and preparation method thereof

Abstract

A needle-shaped nano-silver / nitrogen-doped graphene composite material and a preparation method thereof belong to the technical field of nano-materials. The composite material, according to the mass ratio, graphene oxide: nitrogen source: morphology control agent: silver salt = 1: (0.05-20): (0.001-100): (0.01-10). Preparation method: 1. Prepare graphene oxide dispersion; 2. Add nitrogen source and morphology control agent to graphene oxide dispersion to prepare mixed solution; 3. Prepare silver salt solution; 4. Combine mixed solution and silver salt solution After mixing, transfer it to a hydrothermal reaction kettle, react at 100-220°C for 2-24 hours, and obtain a crude composite material; 5. Centrifuge, wash, and dry the crude composite material to obtain acicular nano-silver / nitrogen-doped graphene composite material . The method simultaneously realizes the nitrogen doping of graphene and the in-situ synthesis of needle-shaped nano-silver particles on the surface of the nitrogen-doped graphene, and the method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials, and in particular relates to a needle-shaped nano silver / nitrogen-doped graphene composite material and a preparation method thereof. Background technique [0002] As a typical two-dimensional new carbon nanomaterial, graphene has a special hexagonal honeycomb structure on its surface endowing it with ultra-high carrier mobility (250000cm / (V s)), ultra-high thermal conductivity (5300W / mK ), large specific surface area (2600m 2 / g), close to 100% light transmittance, extremely strong flexibility. Therefore, graphene has broad application prospects in many fields. A large number of research results have shown that doping elements such as nitrogen, phosphorus, boron, and sulfur in graphene sheets by chemical means can effectively adjust the electronic structure and chemical properties of graphene; element doping of graphene, in While endowing it with higher catalytic and redox reaction acti...

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Problems solved by technology

Tian et al. (Tian Y, Cao Y Y, Chen G Q, Zhang X.Ag nanoparticles surported on N-dopedgraphene hybrids for catalytic reduction of 4-nitropheno[J].RSC Adv.,2014,4,43204-24211.) using one-step water Thermal method prepared spherical nano-silver / nitrogen-doped graphene composites, and studied its catalytic performance; Anju et al. (Anju K N, Indu E, Gopukumar S. Sabu T, Kala M S, Nandakumar K. : an excellent anode material for lithium ion batteries) uses a two-step method to combine nano-silver wires with nitrogen-doped graphene and use it as an anode material for lithium-ion batteries. Although the resulting material has a high capacity and excellent cycle performance, However, the preparation process of the material is too complex

In addition, the morphology of silver nanoparticles in existing nanosilver / nitrogen-doped graphene composites is only spherical and linear, and there are few reports on needle-shaped nanosilver / nitrogen-doped graphene composites.

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