Interfaces
between metals and semiconducting materials can inevitably influence
the magnetotransport properties, which are crucial for technological
applications ranging from magnetic sensing to storage devices. By
taking advantage of this, a metallic graphene foam is integrated with
semiconducting copper-based metal sulfide nanocrystals, i.e., Cu2ZnSnS4 (copper–zinc–tin–sulfur)
without direct chemical bonding and structural damage, which creates
numerous nanoboundaries that can be basically used to tune the magnetotransport
properties. Herein, the magnetoresistance of a graphene foam is enhanced
from nearly 90 to 130% at room temperature and under the application
of 5 T magnetic field strength due to the addition of Cu2ZnSnS4 nanocrystals in high densities. We believe that
the enhancement of magnetoresistance in hybrid graphene foam/Cu2ZnSnS4 nanocrystals is due to the evolution of
the mobility fluctuation mechanism, triggered by the formation of
nanoboundaries. Incorporating Cu2ZnSnS4 nanocrystals
into a graphene foam not only provides an effective way to further
enhance the magnitude of magnetoresistance but also opens a suitable
window to achieve efficient and highly functional magnetic sensors
with a large, linear, and controllable response.
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