Crossover magnetoresistance in non-transferred synthesized graphdiyne film

Two-dimensional layered carbon materials such as graphene constructed by sp(2) hybridization have raised considerable interest due to their large, non-saturating magnetoresistance. As a new sp-sp(2) hybridization structure layered carbon material, the transport performance of graphdiyne has been founded comparable with graphene, while the magnetoresistance remains to be clarified. In this work, we developed a modified non-transferred graphdiyne film synthesized method and studied its magnetoresistance effect. We observed an unexpected temperature-dependent crossover between positive and negative magnetoresistance in graphdiyne film. The film shows negative magnetoresistance at 5-19 K, the maximum intensity of the negative magnetoresistance was about 150% at 5 K under 3 T magnetic field. It presents positive magnetoresistance at 19-21 K under 3 T magnetic field, the magnetoresistance value reached 150% at 20 K. The mechanism of crossover positive and negative magnetoresistance originates from a superposition of the magnetic polaron model and weak localization. (C) 2021 Published by Elsevier Ltd.

Automated summary

This study developed a modified non-transferred graphdiyne film synthesis method and investigated its magnetoresistance effect. A temperature-dependent crossover between positive and negative magnetoresistance was observed in the graphdiyne film, with mechanisms involving the magnetic polaron model and weak localization.