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Influence of Y^(3+),Yb^(3+),Gd^(3+) cations on structural and electromagnetic properties of CuFe_(2)O_(4) nanoferrites prepared via one step sol-gel method

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Journal of Rare Earths 2021年第10期39卷 1224-1231,I0003页

作者： aleena kiran Majid Niaz Akhtar Muhammad Yousaf Khalid Mujassam Batoo Omar MAldossary Salman Naeem Khan Department of Physics COMSATS University IslamabadLahore CampusDefence Road Off RaiwindLahore54000Pakistan Department of Physics Mohammad Nawaz Sharif University of Engineering and TechnologyMultan60000Pakistan School of Energy and Environment Southeast UniversityNo2 Si Pai LouNanjing 210096China King Abdullah Institute for Nanotechnology King Saud UniversityP.O.Box 2455Riyadh11458Saudi Arabia Department of Physics and Astronomy College of ScienceKing Saud UniversityP.O.Box-2455Riyadh11451Saudi Arabia Micro-mm Wave Laboratory(M2L) Department of PhysicsCOMSATS University IslamabadLahore CampusDefence Road Off RaiwindLahore54000Pakistan

Rare earths(REs) play a key role in distorting spinel structure by creating some defects at the lattice sites and make them suitable for magnetodielectric *** the present study,the nanoferrites of CuRE0.02Fe1.98O4,where REs=Y^(3+),Yb^(3+),Gd^(3+),were prepared using one step sol-gel *** prepared samples are copper ferrite(CFO),yttrium doped copper ferrite(Y-CFO),ytterbium doped copper ferrite(Yb-CFO) and gadolinium doped copper ferrite(Gd-CFO),*** single-phase structure of all the REs doped nanoferrites was determined by X-ray diffraction(XRD) *** porosity,agglomerations and grain size of the REs doped copper ferrite were examined using field emission scanning electron microscopy(FESEM) *** transform infrared spectroscopy(FTIR)elaborates the phase formation and environmental effects on the REs doped nanoparticles(NPs).The recorded room temperature M-H loops from a vibrating sample magnetometer(VSM) elucidate the magnetic properties of the REs doped spinel *** magnetic saturation(Ms) was calculated in the range of 23.08 to 51.78 emu/*** calculated coercivity values(272.6 to 705.60 Oe) confirm the soft magnetic behavior of REs doped copper ***,the electromagnetic and dielectric properties were assessed using a Vector network analyzer(VNA) from 1 to 6 *** permeability,permittivity,dielectric tangent loss and electric modulus of the REs doped spinel ferrites illustrate that the prepared NPs may be suitable for microwave and high frequency applications.

关键词： Rare earth elements Nanoparticles Spinel ferrites VSM VNA Magnetodielectric applications

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Molybdenum disulfide-graphene van der Waals heterostructures as stable and sensitive electrochemical sensing platforms

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Tungsten 2020年第4期2卷 411-422页

作者： Stelbin Peter Figerez kiran Kumar Tadi Krishna Rani Sahoo Rahul Sharma Ravi K.Biroju aleena Gigi KAiswarya Anand Golap Kalita Tharangattu N.Narayanan Tata Institute of Fundamental Research Hyderabad 500046India Division of Healthcare Advancement Innovation and ResearchVellore Institute of Technology(VIT)Chennai 600127India Department of Physical Science and Engineering Nagoya Institute of TechnologyNagoya 466‑8555Japan

Atomic layers are sought after for molecular sensing due to their available high surface interaction area,and different types of monolayers are attempted for sensing in the recent ***,their chemical stability towards these molecules is questioned in recent times and alternate methods need to be developed to circumvent such issues,while maintaining high ***,the van der Waals(vdWs)stacks of molybdenum disulfide(MoS_(2))and graphene are shown for their stable electrochemical sensing towards ascorbic acid(AA)and dopamine(DA)-two important *** is known to chemically react with MoS_(2) leading to unstable sensing platform,while here the graphene coverage is shown to protect the MoS_(2) even from low-energy plasma exposure while keeping the same high *** proving the graphene-based protection of the sensor,such a sensing platform is shown for its applicability in DA sensing,where it is found to give a linear response in a wide range of concentrations(2.5 to 600μmol·L^(−1))and even selective sensing in the presence of *** a stack is found to be not merely giving protection to the beneath MoS_(2) layer but also the inter-layer charge transfer due to work function differences being beneficial in bringing fast and high sensitivity to the next-generation sensors and point-of-care devices.

关键词： Graphene Molecular sensing MoS_(2)etching MoS_(2)protection van der Waals structures Electrochemical sensing Ascorbic acid Dopamine

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