Regulating Surfactant Strategy to Synthesize Co@Ncnt Nanocomposites with Conductive Networks Towards Excellent Electromagnetic Wave

Abstract

In this paper, Prussian blue analogue (PBA) with different morphologies have been synthesized by using Na3C6H5O7 and polyvinyl pyrrolidone as surfactant in a co-precipitation process, and then the electromagnetic absorbing properties of their derivatives obtained via a pyrolysis reaction were investigated. To explore the best suitable pyrolysis temperature, PBA precursor synthesized via the addition of Na3C6H5O7 was selected and annealed at different temperatures (550/650/750/850 oC) to obtain the transition metal cobalt encapsulated in nitrogen-doped carbon nanotubes (Co@NCNT) nanocomposites. Our results show that when the pyrolysis temperature is 650 °C, the Co@NCNT shows a minimum reflection loss (RLmin) of -43.95 dB at a thickness of 2.05 mm, and the effective absorption bandwidth reaches 5.695 GHz, spanning the X and Ku bands. The excellent electromagnetic wave absorption properties are attributed to the synergistic effect of dielectric and magnetic loss.

Keywords: surfactant, Prussian blue analogue, effective absorption bandwidth, dielectric and magnetic loss