Constructing Conductive Network in Hybrid Perovskite for a Highly Efficient Microwave Absorption System

Abstract

Electronic devices have brought huge convenience to daily lives; however, a large amount of electromagnetic radiation pollution is generated. Therefore, an urgent demand for electromagnetic wave absorbing materials featuring “low thickness, wide frequency band and strong absorption” is put forward. Here, a strategy of introducing a conductive carbon nanotubes (CNTs) network into CH3NH3PbI3 (MAPbI3) is developed to construct an electromagnetic wave absorbing system. As the absorption center, MAPbI3 dominates the absorption band via an electric polarization process. Meanwhile, the CNTs construct an efficient conductive network, which supply a transmission path for free electrons inside the MAPbI3 crystals and enhance conduction loss. In comparison with the insulated network formed by MoO3/MAPbI3, it is speculated that the broadened absorption bandwidth and reduced absorption thickness originate from the conductive network of CNTs. As a result, when the CNTs is 7.7% (mass ratio), the reflection loss strength of MAPbI3/CNTs reaches −57.71 dB at 13.96 GHz and the corresponding effective absorption bandwidth is 6.32 GHz (11.68–18.00 GHz), with an absorber thickness of 1.96 mm. The method of constructing conductive network proves a great potential of hybrid perovskite in the field of electromagnetic wave absorption and provides feasible strategies for the absorption regulation of dielectric loss‐type materials.

Hybrid organic–inorganic perovskites as microwave radiation switches

“…The values found in this experiment were close to previously shown ones for C 1 PbI in 2-18 GHz range at room temperature. 46 The real part of permittivity for C 5 PbI was close to the value obtained for C 1 PbI: e 0 of this perovskite was 3.29 at 26 GHz, 3.39 at 34.0, and 3.33 at 38.0 GHz. At the same time, e 00 values of C 5 PbI were lower than measured values for C 1 PbI.…”

“…The values found in this experiment were close to previously shown ones for C 1 PbI in 2–18 GHz range at room temperature. 46…”

“…Also, there were multiple reports on significant absorption of microwave frequency radiation by hybrid perovskites at room temperature. 21,22,46,47 Thus, changes of permittivity in the microwave range upon phase transition and high absorption ability in combination with a huge variety of accessible hybrid organic-inorganic perovskites makes this class of materials very perspective for different applications in microwave technologies. Considering low number of published studies on hybrid perovskites interaction with microwave radiation and promising results obtained in the current work, further investigations in this direction are worth performing.…”

Lightweight Honeycomb rGO/Ti3C2Tx MXene Aerogel without Magnetic Metals toward Efficient Electromagnetic Wave Absorption Performance

“…In today’s world, there exists increasingly serious electromagnetic wave (EMW) interference radiation and pollution for the high-speed development electric industry. − To alleviate these problems, high-efficiency EMW-absorbing materials with the superiorities of light weight, thin thickness, wide EMW effective absorption band (EAB), and strong reflection loss (RL) are urgently demanded. − To date, several previous studies principally pay close attention to the control of micromorphology and the best combination between dielectric and magnetic compositions. − For example, Tian and his co-workers prepared a type of zeolitic-imidazolate framework (ZIF-67) derivative embedded boron carbonitride (BCN) nanocomposites. With the filler ratio of 48 wt %, the minimum RL value reached at −56.7 dB at 12.4 GHz when the matching thickness is 2.9 mm.…”

A rational design of multiple-layer films with continuous impedance gradient variation for enhanced microwave absorption

“…With the increase in electromagnetic pollution in recent years, the need for developing brand-new EM functional materials has lately become more pressing. 1–3 In recent years, researchers have made much effort to explore EM-absorbing materials with strong absorption, wide effective bandwidth, low density, and thin thickness. 4–6 Among all types of absorbers, EM wave absorbing film materials have become the focus for their wearable, portable features and easy replacement for damaged parts.…”