A fiber optic magnetic field sensor based on Co doped ZnO nanorods is proposed and demonstrated. The sensor has an operating magnetic field range of 17 mT to 180 mT and shows a maximum sensitivity of ∼18% for 15 at% Co doped ZnO nanorods.

Zachariah C Alex

Department of Sensor and Biomedical Technology

School of Electronics Engineering

Vellore Campus

Narasimman S

Balakrishnan L

Fulltext

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

RSC Advances

Materials Letters

Structural, morphological, optical, dielectric and magnetic field sensing characteristics of Bi1-xKxMnO3 and BiMn1-yCoyO3 nanopowders: A comparative study

Cobalt doping enhances visible absorption in ZnO nanoparticles as a result of d–d transitions. By co-precipitation method, Zn1−xCo xO nanoparticles had been synthesised and multiband photodetectors were fabricated after characteristic analysis.

Multi-band visible photoresponse study of Co2+ doped ZnO nanoparticles

Zn1-xCoxO (0≤x≤0.2) nanoparticles were prepared by co-precipitation method followed by drying at 200°C and subsequent annealing at 500°C. A non-ionic surfactant, Tween-80 which was not reported in earlier studies, was used during the preparation process. X-ray diffraction analysis showed the formation of wurtzite ZnO phase nanostructures. The Rietveld analysis showed the appearance of impurity phase (Co3O4), which was notably present at higher Co doping concentration (x=0.2). Morphological observations using scanning electron microscopy show the formation of nanoparticles with remarkable morphologies. Photoluminescence spectra revealed emission bands in both UV and visible regions due to the defect centers acting as trap levels. Optical studies carried out by diffuse reflectance spectroscopy (DRS) indicated a decrease in the value of the band gap with increasing Co doping concentration. The elemental composition of Zn, Co and O was quantitatively obtained from EDAX analysis which confirmed the purity of the as-prepared nanopowders and that the chemical composition is close to the starting stoichiometries. Magnetisation-Field (M-H) hysteresis curves revealed the appearance of ferromagnetic behaviour, where the magnetic characteristics such as coercivity and saturation magnetization values, were found to be sensitive to Co doping level. © 2015 Elsevier B.V.

Powder Technology

Synthesis of Co-doped ZnO nanoparticles via co-precipitation: Structural, optical and magnetic properties

Materials & Design

Tuned magnetic properties of Co-doped ZnO/B-doped graphene PN junction

Journal of Alloys and Compounds

Band gap engineering of transition metal (Ni/Co) codoped in zinc oxide (ZnO) nanoparticles

Optics & Laser Technology

High sensitive LPFG magnetic field sensor based on dual-peak resonance

Fiber optic magnetic field sensor using Co doped ZnO nanorods as cladding

Journal	Data powered by TypesetRSC Advances
Publisher	Data powered by TypesetRoyal Society of Chemistry (RSC)
ISSN	20462069
Open Access	Yes