Oxygen vacancy mediated polymerization of pyrrole on MoO3 to construct dielectric nanocomposites for electromagnetic waves absorption application

• Published in: Journal of alloys and compounds 2023-03, Vol.938, p.168523, Article 168523
• Main Authors: Xie, Aming, Lin, Xiangpeng, Zhang, Cheng, Cheng, Siyao, Dong, Wei, Wu, Fan
• Format: Article
• Language: English
• Subjects: Electromagnetic waves absorption; Nanocomposites; Oxygen vacancy; Polypyrrole; Transition metal oxides
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.168523

Transition metal oxides (TMOs) with tunable electronic structures and low cost have gained much attention for various applications. However, rational development of TMOs-based electromagnetic waves (EMW) absorbers is still a challenge due to their inherent weak conductivity and loss capacity. Here, we report a delicate oxygen vacancy mediated compounding strategy that the oxygen vacancy can improve the structural properties of molybdenum trioxide (MoO3) to direct the in-situ polymerization of pyrrole, constructing the oxygen vacancy-containing o-MoO3/polypyrrole (o-MoO3/PPy) composites. With the abundant active species aroused from oxygen vacancy and PPy via this design, the great electrical conductivity and excellent dielectric loss capability are simultaneously displayed in o-MoO3/PPy composites. Therefore, the outstanding EMW absorption performance is found at optimized o-MoO3/PPy1, achieving a wide absorption bandwidth of 6.26 GHz, which is remarkably enhanced compared to o-MoO3. This work will provide the valuable strategy for the development of TMOs-based materials for efficient EMW absorption. [Display omitted] •o-MoO3/PPy composites were prepared by oxygen vacancy mediated polymerization.•o-MoO3/PPy shows enhanced electrical conductivity and excellent dielectric loss.•The efficient absorption band o-MoO3/PPy gets to 6.26 GHz.