Construction of layered porous carbon supported titanium with broadband infrared absorption

A polymer precursor composed of polyacrylonitrile (PAN) and polyvinylpyrrolidone (PVP) was prepared, the obtained compound was subsequently mixed with Ti particles and coated on the Cu foil by dip-coating. A layered porous carbon (LPC) loaded Ti particles was successfully constructed for the broadband infrared absorption after the followed carbonization process. SEM and XPS confirmed the structure have dense voids and distinct layers, the carbonization degree of the LPC is at a high level and Ti particles evenly distributed on the skeleton. Raman spectra and laser confocal microscopy reveal that the increase of Ti particles slightly reduces the defect level of the carbonized film, while the accompanied surface roughness that is conducive for absorption has been raised. The model of LPC was established by FDTD simulation of Lumerical software, which shows the electric field intensity that both on the surface and in the middle of layers is enhanced, such feature is originated from the excellent radiation absorptivity of carbon and the multiple reflection between the layered structure, the existence of surface plasmon was also observed through the simulation. Examination for infrared absorbency displays that the average absorption of original LPC film is about 82.1% within the range of 2-20 & mu;m, and the value can be boosted to 86.9% with introduction of Ti particles, but excessive addition will provide a negative impact on absorption.