Nonlinear Optical And Electromagnetic Absorption Properties Of Polyaniline/MoO₃ Nanostructures

Polyaniline (PANI), a well-known and extensively studied conductive polymer, has captured the attention of the scientific community owing to its easy synthesis, low cost,environmental stability, high conductivity, solubility, and chemical sensitivity. MoO3 is an n-type wide band-gap transition metal oxide semiconducting material, which has attracted augmented research interest due to its peculiar layered structure and unusual chemistry of multiple valence states. In this article, We fabricated polyaniline/MoO3 composite nanomaterials, the main contents of the research are shown as follows:1. Synthesis of polyaniline /MoO3 nanostructuresIn this work, we developed an efficient and facile method to fabricate branched polyaniline/MoO3 organic/inorganic heteronanostructures. Scanning electron and transmission electron microscope measurements showed that PANI nanorods with an average diameter and length of about 55 and 110 nm respectively were grown perpendicularly on the surfaces of MoO3 nanorods and the density of the PANI nanorods could be readily controlled by simply changing the addition amount of aniline in the reaction system.2. The nonlinear absorption properties of the polyaniline/MoO3The nonlinear absorption properties of the polyaniline/MoO3 inl-methyl-2-pyrrolidinone(NMP) were investigated by an open-aperture Z-scan technique. The polyaniline/MoP3 in NMP exhibited enhanced reverse saturable absorption properties compared to M0O3 and PANI in NMP. Moreover, the optical properties of the polyaniline/MoO3 in NMP could be controlled by adjusting concentration and input intensity. The nonlinear absorption coefficient 3. value of the polyaniline/MoO3 in NMP was up to 102 cm/GW. Thus the polyaniline/MoO3 has great promise in optical devices such as optical limiters and optical shutters.3. Electromagnetic wave response of polyaniline/MoO310 wt% of the polyaniline/MoO3 was added into wax matrix for measuring the electromagnetic parameters. The minimal reflection loss for the electromagnetic wave absorbent material was up to -33.7 dB at 16.88 GHz for the nanostructures/paraffin composites with a thickness of 2.0 mm, and all of the minimal reflection losses were less than those of the pure polyaniline nanorods in the frequency range of 2-18 GHz. More importantly,the content of the branched nanostructures in the paraffin matrix was only 10 wt%. Thus, the method presented here is a very efficient strategy to fabricate lightweight materials for strong electromagnetic wave absorbents.