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.

Shambavi K

Department of Communication Engineering

School of Electronics Engineering

Vellore Campus

Zachariah C Alex

Department of Sensor and Biomedical Technology

Jacob A.A

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

The effect of Co doping on the structural, optical and magnetic properties of sol-gel derived ZnS films was investigated for their dilute magnetic semiconducting behaviour. X-ray diffraction pattern shows nanocrystalline nature of the films. Raman spectroscopy was used to study the vibrational properties of the films and also to identify any kind of secondary phases. The surface morphology and roughness of the films was analysed through scanning electron microscopy and atomic force microscopy. The chemical binding state of Co in ZnS lattice was confirmed from the X-ray photoelectron spectroscopy. The optical band gap is found to be decreasing with the incorporation of Co in ZnS. The red emission ~1.7 eV ensures tetrahedral occupation of Co atoms in ZnS lattice. The observed room temperature ferromagnetism in Co:ZnS films is attributed to carrier induced magnetization as well as to the intrinsic defects. The origin of magnetism in Co:ZnS system was studied in terms of the spin-polarized electronic density of states obtained through the density functional theory. © 2019 Elsevier B.V.

Thin Solid Films

Effect of cobalt doping on the structural, optical and magnetic properties of sol-gel derived ZnS nanocrystalline thin films and ab initio studies

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.

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

ZnO and cadmium alloyed zinc oxide (Zn0.9Cd0.1O) thin films were deposited on glass substrate by sol-gel spin coating technique for UV–Vis photodetection application. The properties of the thin films were investigated using X-ray diffractometer, atomic force microscope, scanning electron microscope, energy dispersive spectrometer and UV–Vis spectrometer. The optical band gap of ZnO thin films was obtained as 3.1 eV which was shifted to 2.66 eV in Zn0.9Cd0.1O film due to the incorporation of Cd ions on Zn site. The deposited thin films based photodetectors (PDs) were fabricated with aluminium inter-digitated electrode (IDE) contact deposition by metal evaporation technique. The photo-response of the PDs as a function of wavelength was recorded. ZnO film exhibited good photo-sensitivity only towards UV wavelength but Zn0.9Cd0.1O film showed still increased sensitivity towards UV as well showed good response towards blue lights due to the red shift in cut off wavelength. © 2016 Elsevier B.V.

Journal of Alloys and Compounds

Structural, optical and photodetection characteristics of Cd alloyed ZnO thin film by spin coating

Preparation, infrared emissivity and thermochromic properties of Co doped ZnO by solid state reaction

Materials Research Bulletin

Diameter-controlled synthesis of ZnO nanorods on Fe-doped ZnO seed layer and enhanced photodetection performance

Journal of Materials Science & Technology

Control of ZnO nanowire growth and optical properties in a vapor deposition process

Applied Surface Science

Photodetectors for weak-signal detection fabricated from ZnO:(Li,N) films

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

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