Bifunctional Two-Dimensional Nanocomposite with Electromagnetic Wave Absorption and Anti-bacterial Performance

In current electronic information era, the complex application circumstance of 5G devices pursues the exploration of multi-functional electromagnetic wave (EMW) absorbent materials and it has become the crucial focus in industrial development. A two-dimensional (2D) graphite nanosheet decorated by nickel nanocapsules (2D graphite/Ni@C nanocomposite) was fabricated to possess the EMW absorption and the Escherichia coli ( E. coli ) anti-bacterial performance simultaneously. By adjusting the filling ratio and injecting nitrogen doping, the value of minimum reflection loss is − 36.08 dB and the effective absorption bandwidth reaches to 5.12 GHz (from 11.4 to 16.52 GHz) with the mass ratio of 30 wt% and the absorber thickness of 2 mm. This 2D nanocomposite simultaneously gets an excellent anti-bacterial function expressing an E. coli anti-bacterial rate of 92% during 24 h which is significantly correlated to the interaction between the nanostructure of the 2D nanographite and the nickel ion released from Ni@C nanocapsules. This work provides a new approach to develop a promising 2D anti-bacterial EMW absorber.