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.
We synthesizedZnx/(Cu0.5Tl0.5)Ba2Ca3Cu4O12-δ {Znx/CuTl-1234}(x= 0~3 wt.%)nanoparticles-superconductor composites by solid-state reaction technique and examined the effects of zinc (Zn) nanoparticles on structural and superconducting properties of CuTl-1234 phase. Unaltered crystal structure of host CuTl-1234 phase confirmed the existence of Zn nanoparticles at intercrystallite sites. We observed an improvement in grains size and intergrains connectivity by healing up the voids after incorporation of Zn nanoparticles in CuTl-1234 superconductor. Superconducting properties ofZnx/CuTl-1234 composites were suppressed for all Zn nanoparticles concentrations. Suppression of zero resistivity critical temperature{Tc(0)}and variation in normal state resistivity{ρ300 K (Ω-cm)}were attributed to reduction of superconducting volume fractions and enhanced scattering cross section of mobile carriers.
: The existence of Vibrio cholera (V. cholera) is a major health problem in many parts of the world; therefore, the treatments of V. cholera have always remained necessary for public safety, health, and environmental protection. In the last few decades, plasma discharges have proven to be a novel technique of sterilization against infectious bacteria such as V. cholera. In this research, a low-pressure plasma (LPP) technique has been introduced for the degradation of multidrug resistant V. cholera. The V. cholera strains with 107 CFUs (colony-forming units) were treated by low-pressure plasma, with and without H2O2 injection into the sterilization chamber, to investigate and report the adverse effects of plasma on V. cholera. The results demonstrated that plasma treatment has significant effects on the degradation of V. cholera in the presence of H2O2 vapors inside the plasma sterilization chamber. The time-course study of the bactericidal effects revealed that there is no regeneration or increase in the number of V. cholera colonies after plasma treatment.
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