Extremely large, linear, and controllable positive magnetoresistance in neodymium-doped graphene foam for magnetic sensors

Strain engineering of graphene is a widely researched topic of the decade, one can realize the unique applications of graphene due to the strain affect. Doping in graphene is one of the methods to introduce strain and rare earths (RE) doping in graphene is a challenging task as the size of RE-atoms is much bigger compared to carbon. Herein, neodymium (Nd) is doped in graphene foam (GF) successfully, with the help of double-zone chemical vapor deposition (CVD) at hollow sites (interstitial doping). The doping is confirmed from several characterization tools and magnetotransport properties are detected after word's. An extremely large positive magnetoresistance (PMR similar to 1410% at 5 K under 8 T applied magnetic field) is observed in Nd-doped GF compared to as-grown GF (PMR similar to 250% at 5 K under 8 T applied magnetic field). The PMR afterward starts decreasing upon the fabrication of Nd-composite at high temperature similar to 1400 degrees C. Technologically, topological band structure of graphene upon doping influences the path of charge carriers as a result, a change in fermi-surface occurs, due to which unique applications can be realized. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

In this study, successful doping of neodymium in graphene foam was achieved using double-zone chemical vapor deposition at hollow sites. The doping resulted in an extremely large positive magnetoresistance, which decreased after the fabrication of neodymium composite at high temperature.