Multispectral ErBO <sub>3</sub> @ATO porous composite microspheres with laser and electromagnetic wave compatible absorption
Songsong Guo, Jianping Zhu, Z. Song, Qingguo Ren, Tong Feng, Qitu Zhang, Lixi Wang
Abstract
Abstract The high‐speed advances in electromagnetic (EM) wave and laser detection technology have accelerated the innovation of absorbing materials toward specific multi‐band compatibility. It is difficult to achieve dual absorption of EM waves and near‐infrared lasers by absorbing materials in a single frequency band; the design of high‐performance laser‐EM wave multi‐band compatible absorbing materials is imminent. Herein, ErBO 3 @ATO (erbium borate/antimony‐doped tin oxide) porous composite microspheres with an average size of 15–20 μm are produced solvothermal method and self‐assembly, which exhibit excellent laser‐EM wave compatible absorption. The porous structure on the surface of ErBO 3 microspheres provides heterogeneous nucleation sites for ATO particle deposition. The minimum reflectivity of the composite for 1.06 and 1.54 μm lasers is 9.59% and 4.79%, which is 0.57% and 3.78% lower than those of pure ATO particles, respectively. The composites containing 70 wt% porous ErBO 3 @ATO reveal the minimum reflection loss (RL) value of − 31.6 dB, and an effective absorption band width reaches 2.08 GHz at 2.5 mm thickness. The mechanism of near‐infrared laser and EM wave compatible absorption is the synergistic effect of the energy level transition of ErBO 3 and the dielectric loss of ATO, coupled with the large surface area and porous structure of the microspheres. Therefore, the designed porous ErBO 3 @ATO composite microspheres can be an attractive choice for lasers and EM wave high‐quality compatible absorption.