B. Renganathan
National Institute of Technology, Tiruchirappalli
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Publication
Featured researches published by B. Renganathan.
IEEE Sensors Journal | 2011
P. Indra Devi; N. Rajkumar; B. Renganathan; D. Sastikumar
Undoped and Mn-doped cobalt ferrite (CoFe2O4) nanoparticles were synthesized and characterized for thermal conductivity and magnetic properties. Room temperature ferromagnetism and an increase in saturation magnetization due to Mn doping (65.4 emu/g for 3 at.% of Mn and 20.8 emu/g for undoped CoFe2O4 nanoparticles) are observed. The ethanol gas sensitivity of undoped and Mn-doped (3 at.%) CoFe2O4 nanoparticles were experimented at ambient temperature using optical fiber based on clad-modified method. By modifying the clad exposure to gas vapor, the sensitivities were estimated to be 7 and 12 counts/100 ppm for undoped and Mn-doped CoFe2O4 nanoparticles, respectively, showing significant enhancement in ethanol gas sensitivity.
IEEE Sensors Journal | 2014
Loukkose Rosemary Shobin; B. Renganathan; D. Sastikumar; Kyu Chang Park; S. Manivannan
Multi-walled carbon nanotubes (MWCNTs) coated intensity modulated fiber optic sensor for the detection of ethanol and methanol vapors at room temperature is reported. Pure, 30 and 60 min iso-butyl methyl ketone (IBMK) treated MWCNT were coated on cladding removed polymethyl methacrylate fiber by the dip coating technique. The pure and IBMK treated MWCNT coated fibers were used as sensors. Response of the sensors was studied by measuring the change in output light intensity for different methanol and ethanol vapor concentrations in the range of 0-500 ppm. The 60 min IBMK treated MWCNT coated sensor showed 2 and 3.4 fold increase in the sensitivity for methanol and ethanol vapors at 640 and 630 nm wavelengths light, respectively, compared with the pristine MWCNT coated sensor. Fourier transform infrared spectroscopy confirmed the attachment of C=O functional group in IBMK treated MWCNT. Thermogravimetry results reveal the functionalized nanotubes decomposed at 475 °C after the elimination of attached functional groups. The pristine nanotubes start to decompose at 540 °C. The randomly oriented nanotubes layer of average thickness 1.5 μm on the cladding modified fiber is observed from scanning electron microscope images.
Proceedings of SPIE, the International Society for Optical Engineering | 2008
D. Sastikumar; Govindan Gobi; B. Renganathan
A fiber optic sensor for measuring thickness of transparent plates (1 to 2.5 mm) is proposed based on reflective type displacement fiber optic sensor. The peak position in the output of the receiving fiber, which various linearly, is related to the thickness of the transparent plate. Theoretical model is proposed and compared with the experimental results. The output characteristics of the sensor are studied in terms of fiber optic parameters such as numerical aperture and diameter.
Proceedings of SPIE | 2011
S. Manivannan; L. R. Shobin; A.M. Saranya; B. Renganathan; D. Sastikumar; Kyu Chang Park
We report, intrinsic fiber optic carbon nanotubes coated sensor for the detection of ammonia gas at room temperature. Multimode step index polymethyl methacrylate (PMMA) optical fiber passive cladding is partly replaced by an active coating of single and multi-walled carbon nanotubes following the dip coating technique and the reaction with ammonia is studied by measuring the change in output intensity from the optical fiber under various ammonia gas concentrations in the range 0-500 ppm in step of 50 ppm. The sensitivity is calculated for different wavelengths in the range 200-1100 nm both for single and multi-walled carbon nanotubes coated fiber. Higher sensitivities are obtained as 0.26 counts/ppm and 0.31 counts/ppm for single-walled (average diameter 1.3 nm, 30 wt.% purity) and multi-walled (average diameter 10-15 nm, 95 wt.% purity) carbon nanotubes respectively. The role of diameter and purity of carbon nanotubes towards the ammonia sensing is studied and the results are discussed.
Proceedings of SPIE | 2010
B. Renganathan; D. Sastikumar; Govindan Gobi; Ramasamy Srinivasan; N. Rajeshwari Yogamalar; A. Chandra Bose
Fiber optic sensor is proposed based on cladding modification method for detecting ammonia emissions. Nanocrystalline titanium dioxide is used as a sensing material and spectral characteristics of the sensor are studied for different concentrations (50-500 ppm) of ammonia, methanol and ethanol. The sensor shows a linear variation in the output light intensity with the concentration. The light intensity increases for ammonia whereas it decreases for methanol and ethanol. Gas selectivity of the sensor is discussed.
Journal of Applied Physics | 2017
R.N. Mariammal; N. Rajamanickam; B. Renganathan; D. Sastikumar
Undoped and Co-doped (0.5 and 3 at. %) SnO2 nanoparticles were synthesized by the co-precipitation method and the structural characterization done by X-Ray diffraction revealed the tetragonal rutile structure with a weak CoO phase in 3 at. % Co-doped sample. TEM and high-resolution transmission electron microscope images of Co-doped (3 at. %) SnO2 nanoparticles showed the presence of almost spherical nanoparticles with the particle size in the range of 7–9 nm. Pure SnO2 showed mixed phases of ferro and diamagnetism while Co-doped (3 at. %) SnO2 nanoparticles showed only ferromagnetism at room temperature. The room temperature ferromagnetism (RTFM) in the Co-doped sample is due to the interaction of the localized spins of the Co ions with the oxygen vacancies, which are introduced due to the substitution of Co2+ ions for Sn4+ ions (bound magnetic polarons). The presence of oxygen vacancies and the small particle size are responsible for the slightly enhanced ethanol sensitivity of Co-doped (3 at. %) SnO2 n...
OPTICS: PHENOMENA, MATERIALS, DEVICES, AND CHARACTERIZATION: OPTICS 2011: International Conference on Light | 2011
B. Renganathan; D. Sastikumar; Govindan Gobi; N. Rajeswari Yogamalar; A. Chandra Bose
Fiber optic sensor based on cladding modification method for detecting various gas emissions such as ammonia methanol, and ethanol is proposed. The Ce doped ZnO annealed at 500 and 1200 °C are used as a gas sensing material. The spectral characteristics of the gas sensor are studied for different concentrations (0–500 ppm) of gases. The sensor exhibits a linear variation in the output light intensity with the concentration. The gas sensitivity and selectivity of the sensor is discussed briefly.
Optics and Laser Technology | 2011
B. Renganathan; D. Sastikumar; G. Gobi; N. Rajeswari Yogamalar; A. Chandra Bose
Sensors and Actuators B-chemical | 2011
B. Renganathan; D. Sastikumar; G. Gobi; N. Rajeswari Yogamalar; A. Chandra Bose
Sensors and Actuators B-chemical | 2012
R.N. Mariammal; B. Renganathan; D. Sastikumar