Hybrid Reduced Graphene Oxide with Special Magnetoresistance for Wireless Magnetic Field Sensor

Abstract

HIGHLIGHTS • Cost-effective and time-efficient process for hybrid reduced graphene oxide (rGO) nanosheets with special magnetoresistance properties was fabricated. • The prepared hybrid rGO nanosheets have large magnetoresistance at low magnetic field at room temperature and used in wireless magnetic field sensors for quick detection of low electromagnetic radiation. ABSTRACT Very few materials show large magnetoresistance (MR) under a low magnetic field at room temperature, which causes the barrier to the development of magnetic field sensors for detecting low-level electromagnetic radiation in realtime. Here, a hybrid reduced graphene oxide (rGO)-based magnetic field sensor is produced by in situ deposition of FeCo nanoparticles (NPs) on reduced graphene oxide (rGO). Special quantum magnetoresistance (MR) of the hybrid rGO is observed, which unveils that Abrikosov's quantum model for layered materials can occur in hybrid rGO; meanwhile, the MR value can be tunable by adjusting the particle density of FeCo NPs on rGO nanosheets. Very high MR value up to 21.02 ± 5.74% at 10 kOe at room temperature is achieved, and the average increasing rate of resistance per kOe is up to 0.9282 Ω kOe −1. In this paper, we demonstrate that the hybrid rGO-based magnetic field sensor can be embedded in a wireless system for real-time detection of low-level electromagnetic radiation caused by a working mobile phone. We believe that the two-dimensional nanomaterials with controllable MR can be integrated with a wireless system for the future connected society.

Multiphysics Modeling Simulation and Optimization of Aerodynamic Drum Magnetic Separator

“…In order to verify the accuracy of the magnetic field simulation results, it is necessary to measure the magnetic induction of each point around the magnetic system, and then compare with the simulation results. There are many ways to measure the magnetic field [37][38][39], among which the use of Tesla meter is relatively simple and accurate. In this study, HM-100 Tesla meter was used, as shown in Figure 3.…”

Atomically Thin 2D van der Waals Magnetic Materials: Fabrications, Structure, Magnetic Properties and Applications

“…Various kinds of 2D materials, such as transition metal dichalcogenides (TMDs), ternary transition metal compounds (ABX 3 ), transition metal carbide/nitrides (MXene), and their potential related applications, have been reported in succession. In particular, materials that possess 2D ferromagnetism developed rapidly [4], which is of great importance for highly sensitive magnetic measurement methods [5][6][7]. Ferromagnetism originates from the intrinsic magnetic dipole moment or the parallel arrangement of electron spin in the crystal, which allows for spontaneous magnetization even without an external magnetic field.…”

Laser Direct Writing of Highly Ordered Two‐Level Hierarchical Microstructures for Flexible Piezoresistive Sensor with Enhanced Sensitivity

“…These methods usually require multiple steps to complete the fabrication of HMs, and the process is complex, time‐consuming, and expensive, which limits the rapid fabrication and applications of flexible piezoresistive sensors. By contrast, laser has the advantages of fast and high efficiency for maskless, [ 29–32 ] making it a promising method for fabricating flexible electronics. [ 33 ] Deka et al.…”

“…[1] At present, researchers have proposed various manufacturing methods for developing flexible limits the rapid fabrication and applications of flexible piezoresistive sensors. By contrast, laser has the advantages of fast and high efficiency for maskless, [29][30][31][32] making it a promising method for fabricating flexible electronics. [33] Deka et al [34] induced carbon nanostructures on the carbon fabric using a continuous wave laser, which was subsequently used in fabricating a flexible strain sensor.…”