Magnetic graphene/Ni-nano-crystal hybrid for small field magnetoresistive effect synthesized via electrochemical exfoliation/deposition technique

Abstract

Two-dimensional heterostructures of graphene (Gr) and metal/semiconducting elements convey new direction in electronic devices. They can be useful for spintronics because of small spin orbit interaction of Gr as a non-magnetic metal host with promising electrochemical stability. In this paper, we demonstrate one-step fabrication of magnetic Ni-particles entrapped within Gr-flakes based on simultaneous electrochemical exfoliation/deposition procedure by two-electrode system using platinum as the cathode electrode and a graphite foil as the anode electrode. The final product is an air stable hybrid element including Gr flakes hosting magnetic Ni-nano-crystals showing superparamagnetic-like response and room temperature giant magnetoresistance (GMR) effect at small magnetic field range. The GMR effect is originated from spin scattering through ferromagnetic/non-magnetic nature of Ni/Gr heterostructure and interpreted based on a phenomenological spin transport model. Our work benefits from XRD, XPS, Raman, TEM, FTIR and VSM measurements We addressed that how our results can be used for rapid manufacturing of magnetic Gr for low field magneto resistive elements and potential printed spintronic devices.

Improving Fire Retardancy of Beech Wood by Graphene

“…The size of Ni and Ni(OH) 2 nanocrystals obtained by TEM and XRD patterns were found to be 30-40 nm. The brightness of graphene sheets appearing in TEM images showed a small thickness (1.2 µm) of graphene sheets [42].…”

Preparation, characterization and catalytic performance of Pt supported on porous carbonaceous materials in the oxidation of toluene as a volatile organic compound

“…The diffraction peak in the CNT and CNF pattern at 2 θ = 26° and 43° is allocated to the crystal face of carbon, which exhibits the crystallized graphite and high electric conductivity, (0 0 2) and (1 0 0). 13–15 In the graphene pattern, the peak at 2 θ = 23° indicates the formation of graphene from graphene oxide after the solvothermal process (0 0 2) and the diffraction peak at approximately 2 θ = 43° demonstrates (1 0 0) plane which shows the hexagonal structure of carbon. 16,17 The appearance of a peak at 2 θ between 20° and 30° shows the presence of carbon in the pattern of AC.…”

Current Progress of Magnetoresistance Sensors

“…Graphene foams (GF) are three-dimensional arranged graphene structures with good biocompatibility and MR property [36][37][38][39][40][41][42]. Hybrid graphene nanocomposites with MR are constructed with graphene and reduced graphene oxide (rGO) [29,[43][44][45][46][47][48][49][50].…”