Polyaniline-Based Infrared Dynamic Patterned Encoder with Multiple Thermal Radiation Characteristics

Abstract

A high-level infrared dynamic patterned encoder (IR-DPE) possesses prospective applications for energy-harvesting and information, but a simple and reliable method for fabrication remains challenging. Herein, we first report an IR-DPE with multiple thermal radiation characteristics based on polyaniline (PANI). Specifically, the electron-beam evaporation technique is introduced to obtain the divanadium pentoxide (V 2 O 5 ) coating, and then the V 2 O 5 film acts as an oxidant to drive in situ polymerization of the PANI film. During the process, we experimentally explore the relationship between the thickness of V 2 O 5 and the emissivity of PANI to obtain up to six emissivity levels and achieve the IR pattern integrated into multiple thermal radiation characteristics. The device shows multiple thermal radiation characteristics at the oxidized state, realizing a pattern visible with the IR camera and the same thermal radiation properties at the reduced state, leading to the pattern concealed in the IR regime. In addition, the highest emissivity tunability of the device is to be tuned from 0.40 to 0.82 (Δε = 0.42) at 2.5−25 μm. Meanwhile, the device exhibits a maximum temperature control of up to 5.9 °C. The results show the enormous potential of IR-DPEs for IR information transfer and thermal management.

Multicolored Displays with Selective Visible‐Infrared Spectral Modulation for Optical Information Transmission

“…[ 3 ] It possesses the ability to change the apparent color in the visible region and modulate thermal emissivity in the infrared region. [ 4 ] The IR electrochromic material, including graphene, [ 5 ] MXene, [ 6 ] tungsten oxide (WO 3 ), [ 7 ] polyaniline (PANI), [ 8 ] and poly(3,4‐ethylene dioxythiophene) (PEDOT) [ 9 ] have been put forward. As a typical conducting polymer, PANI has attracted a great deal of attention due to its excellent emissivity modulation ability.…”