N. Suriyanarayanan

N. Suriyanarayanan
Government College of Technology | GCT · Department of Physics

MSc; MS; PhD

About

80
Publications
13,845
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1,002
Citations
Citations since 2016
13 Research Items
733 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Additional affiliations
April 2001 - present
Government College of Technology
Position
  • Professor (Associate)
Description
  • Teaching and research . Currently working on Solar thin films and Nano materials .Nano materials application to gas sensor materials and environmental applications .

Publications

Publications (80)
Article
Algae-assisted auto-combustion method was adopted to prepare Algae/CoFe2O4 and Algae/Ag-Fe-O nanoparticles (NPs). Structural properties of the samples were investigated using XRD (X-ray Diffraction) FTIR (Fourier Transform Infra-red Spectroscopy), SEM (Scanning Electron Microscopy), and EDX (Energy Dispersive X-ray Analysis) and magnetic properties...
Article
Copper ferrite (CuFe 2 O 4 ) nanoparticles were synthesized by sol–gel auto combustion method using cow-urine as a chelating agent. The obtained ferrite nanoparticles are heat treated at different temperatures (450 °C and 750 °C) in order to study their size dependent structural and magnetic properties. Energy Dispersive X-ray (EDX) spectra showed...
Article
Pure and Ag substituted cobalt ferrite nanoparticles (NPs) having the composition (1−x)CoFe2O4: xAg (x = 0.0, 0.2) were synthesized by a novel honey assisted combustion method in order to investigate their structural and magnetic properties along with their antibacterial activity. XRD patters confirm the spinel phase of CoFe2O4 and the presence of...
Article
Full-text available
A facile, eco-friendly synthesis of zinc oxide nanoparticles (ZnO NPs) employing Bauhinia tomentosa leaf extract as bioreducing agent was reported. The green-synthesized ZnO NPs were characterized by UV–Vis, TEM, EDX, XRD, and FTIR analyses. The formation of ZnO NPs was confirmed by the appearance of characteristic SPR peak at 370 nm due to the col...
Article
Full-text available
Structural, optical and electrical studies of V2O5 and FexV2O5 (x = 5%) nanostructures synthesized by a wet chemical method have been reported. The synthesized nanostructures were characterized by XRD, SEM–EDX, HRTEM, XPS, UV(DRS), FT-IR, PL, TG–DTA, AC and DC conductivity study’s. The anorthic phase was observed in the XRD patterns of undoped and...
Article
In the present work, ZnxBi2-xS3 films were synthesized (x =0.2 M) by a chemical bath deposition (CBD) technique at different bath temperatures (60 °C, 70 °C and 80 °C). The role of bath temperature on the formation of the films has been examined. The crystalline nature, structural parameters and surface morphology of the films were ascertained usin...
Article
Pure and tungsten-doped V2O5 (WxV2O5; x = 5%, 10% and 15%) nanorods were produced by the wet chemical method followed by annealing at 60 °C for 12 h and 600 °C for 1 h. The influence of dopant concentration on the structural, morphological, optical and electrical properties of V2O5 nanorods were investigated through XRD, SEM-EDS, TEM, PL and DC con...
Article
Study on the optoelectronic characteristics of cation-substituted nanostructure is a specific area of recent interest for a wide range of photonic applications. In the present work, the AlxV2O5 (where x=0, 5, 10 and 15%) nanoparticles were synthesized by wet chemical-calcination process. X-ray diffraction study revealed the orthorhombic phase of 60...
Article
Nanocrystalline spinel ferrite of composition Cu0.2Ni0.2Sn0.2Ba0.4 Fe2O4 has been synthesized by a wet hydroxyl chemical route in ethylene glycol as chelating agent and sodium hydroxide as precipitator at pH 8. Ethylene glycol has been used as the medium which serves as the solvent as well as a complexing agent. The synthesized particles are anneal...
Article
Nanocrystalline copper ferrite CuFe2O4 is synthesized by co-precipitation method in ethylene glycol as chelating agent, using sodium Hydroxide as precipitator at pH 8. The as synthesized CuFe2O4 is annealed at temperatures of 350 °C, 700 °C, and 1050 °C for 2 hours respectively. The thermal analysis of the synthesized sample is done by TG technique...
Article
Full-text available
Vanadium pentoxide (V 2 O 5) thin films were prepared on glass substrates using precursor solution of vanadium tri-chloride (VCl 3) for different concentration at two substrate temperatures (T s) 250 & 300 o C respectively. The deposited thin films were characterized in order to find the XRD, HRSEM, UV, PL, Hall Effect and DC electrical conductivit...
Article
Copper Indium Disulphide (CuInS2) is an efficient absorber material for photovoltaic and solar cell applications. In this paper Bi (0.02 and 0.03 M) doped CuInS2 thin films are (Cu/In = 1.25) deposited on to glass substrates in the temperature range 300-400 °C. The optical bandgap energy (Eg) increases with the increase in temperatures for both 0.0...
Article
Copper doped nickel ferrites Ni(1−x)CuxFe2O4 (where x=0.2, 0.4, 0.6) nanoparticles are prepared by co-precipitation method and sintered at 600 °C. The XRD study confirms the formation of single-phase cubic spinel Ni–Cu ferrites. The particle size increases with Cu substitution. FT-IR spectra confirm the absorption bands around 554–547 cm−1 for the...
Article
Full-text available
MnFe2O4 and Mn0.4Co0.6Fe2O4 samples at pH 11 and sintering temperatures 300 °C, 600 °C and 900 °C, were prepared by co-precipitation technique. All properties of the samples are highly dependent on sintering temperature. The samples were analyzed using XRD to study the particle size and crystalline nature, and both increase with increasing sinterin...
Article
a b s t r a c t Manganese ferrite (MnFe 2 O 4) samples of good homogeneity were synthesized at pH 8 and pH 11 for different annealing temperatures through wet chemical synthesis by a co-precipitation method. Particle size increases and crystalline nature improved with increase in annealing temperatures as indicated in XRD peaks. EDS study confirmed...
Article
Copper substituted cobalt–nickel mixed ferrite nano particles are synthesized by co-precipitation method and the samples are sintered at 130 °C, 600 °C and 900 °C. The effects of sintering on structural and magnetic properties are studied using XRD analysis and VSM studies. The particle sizes are found to be 12 nm and 32 nm for the samples sintered...
Article
Nanocrystalline zinc (Zn)-substituted cobalt ferric oxide (CoFe2O4) was prepared through chemical co-precipitation; the prepared samples were annealed at 600 °C, 750 °C and 900 °C. The crystallite size, microstructure and magnetic properties of the prepared and annealed samples were studied by using X-ray powder diffraction (XRD), Transmission Elec...
Article
Nickel nanoparticles have been synthesized by chemical reduction method. By the analysis of X-ray diffraction, the resultant particles are characterized and found to be pure crystalline nickel with a face-centered cubic (FCC) structure. The morphology and size of the nanoparticles are studied by scanning electron microscopy (SEM) and micrographs re...
Article
Nanosized Nickel particles have been synthesized by chemical reduction method. The structure, morphology and optical properties of the as-synthesized Nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDXS) and UV-visible absorption spectrophotometer.XRD studies ind...
Article
Cadmium Sulphide thin films have been deposited on to well cleaned glass substrate in a vacuum of 10-6 Torr. The thickness of the films has been determined by quartz crystal monitor method. CdS thin film of lower thicknesses has amorphous structure and higher thickness has polycrystalline nature with cubic structure. The structural parameters such...
Article
Full-text available
The Powders of Ni-Zn ferrite having the chemical formula Ni (0.6) Zn (0.4) Fe2O4 were synthesized by using chemical coprecipitation method and followed by heat treatment at 130 °C,600 °C & 900 °C. X-ray powder diffractometry (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were carried out to investigate...
Article
Full-text available
Nano-sized Cobalt ferrites doped with copper as an additive element CoxCu(1-x)Fe2O4 (where x =0,0.2,0.4,0.6,0.8,1) are synthesized using co-precipitation method. Cobalt-Copper ferrite samples sintered at 600○C are subjected to X-ray diffraction to calculate the average particle size and lattice parameters using Debye – Scherrer formula. The FT-IR s...
Article
Nanopowders of CoFe2O4 are synthesized via wet chemical co-precipitation processing at pH 8. The synthesized nanoferrite powders are annealed at various temperatures (350 °C, 700 °C and 1050 °C) and are characterized. X-ray diffraction (XRD) patterns indicate the crystalline nature of CoFe2O4 nanopowders. Transmission electron microscope (TEM) inve...
Article
Copper indium disulphide (CuInS2) is an efficient absorber material for photovoltaic applications. In this work Zn (0.02 and 0.03 M) doped CuInS2 thin films are (Cu/In = 1.25) deposited onto glass substrates in the temperature range 300-400 degrees C. XRD patterns depict, Zn-doping facilitates the growth of CuInS2 thin films along (1 1 2) preferred...
Article
Full-text available
Nanoparticles of Ni(0.8−x) Co(0.2) Zn(x) Fe2O4 ( = 0.2, 0.4, and 0.6) are prepared by chemical coprecipitation method. Effects of zinc substitution on structural and magnetic properties have been investigated. The X-ray diffraction and infrared spectroscopy are used to characterize the samples. The XRD pattern of the samples provides evidence of si...
Article
Nickel nanoparticles around 12nm were prepared by chemical reduction of Nickel Chloride dissolved in Ethylene glycol, in which hydrazine act as a reducing agent and NaOH as stabilizer. The powder XRD study confirms that the average size of the particle is 12nm.The Ni particles show the characteristic of super paramagnet with saturation magnetizatio...
Article
Polyol assisted Copper indium disulphide (CuInS2) is an absorber material for solar cell and photovoltaic applications. In this work, ethylene glycol (10ml) assisted CuInS2 thin films are grown in the temperature range 300, 350 and 400°C on heated glass substrates. It is observed that the film growth temperature, the ion ratio (Cu/In = 1.25). The X...
Article
Single-crystalline lead bismuth sulphide (PbBiS2) thin films were successfully deposited on glass substrate by chemical bath deposition technique. The films were characterised by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive analysis of X-ray (EDAX) and UV–VIS absorption spectroscopy. X-ray diffraction analysis indi...
Article
CuInS2 is a good absorber for solar cell and photovoltaic devices. In this work, Bi-doped (0.1 M) CuInS2 thin films are deposited in the temperature range of 300–400 °C. Bi doping and temperature affect the growth of polycrystalline CuInS2 thin films. EDAX confirms the presence of Bi, Cu, In and S in the films. Optical studies show that the Bi dope...
Article
Nickel nano particles around 12nm were prepared by chemical reduction of Nickel Chloride dissolved in Ethylene glycol, in which hydrazine act as a reducing agent and NaOH as stabilizer. The powder XRD study confirms that the average size of the particle is 12nm.The Ni particles show the characteristic of super paramagnet with saturation magnetizati...
Article
Face centered cubic nickel has been synthesized through reduction of nickel chloride by hydrazine at 900C.X-ray powder diffraction showed that as-prepared samples were nickel with FCC structure. Scanning electron microscopy indicated that the particles were spherical and EDAX study confirmed the presence of high purity of nickel. Magnetic measureme...
Article
Copper indium disulfide (CuInS2) is an efficient absorber material for photovoltaic and solar cell applications. The structural, optical, photoluminescence properties and electrical conductivities could be controlled and modified by suitably doping CuInS2 thin films with dopants such as Zn, Sn, Bi, Cd, Na, N, O, P and As. In this work Zn (0.01 M) d...
Article
Copper substituted cobalt ferrite nano particles Co(1 − x)CuxFe2O4 (where x = 0, 0.2, 0.4, 0.6, 0.8, 1) are successfully synthesized using co-precipitation method and samples are sintered at 900 °C. The average nano crystalline sizes are found to be in the range of 37–52 nm. As the copper concentration increases, the magnetization of the octahedral...
Article
Nanocrystalline powders of Ni-Zn ferrite having chemical formula Ni (0.8) Zn (0.2) Fe2O4 was synthesized by chemical co-precipitation technique. The samples synthesized were sintered at 600oC and 900°C and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy(SEM), Dielectric studies...
Article
The formation of nanocrystalline nickel particles has been investigated via a chemical reduction method. The powder XRD study confirms that the average size of the particle is 12nm.The quantum size confinement of the crystallites is evident from the blue-shift of the absorption edge in the UV-visible absorption spectrum. Result of the thermo gravim...
Article
Nanoscale iron particles are increasingly attracting interest as efficient sorbents for various types of pollutants from aqueous solutions and effluents. This study investigated the applicability of Iron oxide nanoparticles for the selective removal of lead and zinc from aqueous solution and effluents. In the present study, nanoparticles were prepa...
Article
Using chemical bath deposition (CBD) technique, CuBiS 2 thin films of different bath temperature and deposition time were prepared on glass substrates. There is a blue shift in the PL spectrum of CuBiS 2 thin films were observed. A strong emission peak is observed at 419 nm. The excitation wavelength was 209 nm. This effect may be related to the qu...
Article
Diabetic retinopathy (DR) is a common retinal complication associated with diabetes. Along with optic disk and blood vessel of normal patients, the diabetic patient's retinal image has exudates. Sometimes exudates and optic disk are similar in brightness, color and contrast. It is very important to differentiate them. The blood vessel is extracted...
Article
Copper bismuth sulphide thin films have been prepared onto well cleaned glass substrates by chemical deposition method using copper nitrate, bismuth nitrate, sodium thiosulphate and EDTA as complexing agent. Studies of Hall effect show that the carrier concentration (n) decreases while Hall mobility (μ) increases with the increase of bath temperatu...
Article
Thin films of CdS of different thickness have been prepared on glass substrates in various temperatures by Chemical bath deposition. The thickness of the deposited film is measured by employing quartz crystal monitor method. The optical properties have been studied. The variation of band gap values of CdS thin film samples were found to be in the r...
Article
Bismuth sulphide thin films have been prepared onto amorphous glass substrates by chemical bath deposition method at bath temperature of 333K using bismuth nitrate, sodium thiosulphate and EDTA as complexing agent. The deposited films are characterized by X-ray diffraction and optical absorption. The effect of annealing on the structural and optica...
Article
Thin films of Copper bismuth sulphide prepared on well cleaned glass substrates by chemical deposition showed polycrystalline in nature with monoclinic structure. The average grain sizes as calculated from Scherrer's formula were found to be within the range 237 angstrom to 752 angstrom. The films are oriented in the (403) direction. In addition, o...
Article
Cadmium Sulphide thin films have been deposited on to well cleaned glass substrate in a vacuum of 10 -6 Torr. The thickness of the films has been determined by quartz crystal monitor method. CdS thin film of lower thicknesses has amorphous structure and higher thickness has polycrystalline nature with cubic structure. The structural parameters such...
Article
Copper indium disulphide (CuInS2) is an absorber material for solar cell and photovoltaic applications. By suitably doping CuInS2 thin films with dopants such as Zn, Cd, Na, Bi, Sn, N, P and As its structural, optical, photoluminescence properties and electrical conductivities could be controlled and modified. In this work, Sb (0.01 mole (M)) doped...
Article
Full-text available
Thin films of antimony tri-sulphide are prepared by chemical bath deposition technique. The effect of concentrations of Sb and annealing temperature is studied to determine the optimum conditions for deposition process. Films prepared with different molar ratios of Sb are annealed at a temperature of 423K. The structure, morphology and compositions...
Article
Antimony tri -sulphide (Sb 2S 3) thin films are deposited onto glass substrates by vacuum evaporation under the pressure of 2×10 -5 Torr. The substrate to source distance is optimized and constant rate of evaporation is maintained. The samples are annealed at 473K and 523K. Similarly by using spray technology three different concentrations of Sb 2S...
Article
In the present research paper, Sb 2S 3 thin films are deposited on glass substrates for various depositions time periods. Preparative parameters such as bath composition, complexing agent and deposition time are optimized. The effect of thermal annealing on the structural and optical properties of antimony tri sulfide (Sb 2S 3) thin films is studie...
Article
Copper indium disulphide (CuInS2), is a good absorber material for photovoltaic applications. In this work, CuInS2 is deposited by chemical spray pyrolysis on heated glass substrates. It is observed that the film growth temperature and the ion ratio Cu/In affects the structural and optical properties of CuInS2 thin films. This paper presents the ef...
Article
Full-text available
Diabetic retinopathy is the cause for blindness in the human society. Early detection of it prevents blindness. Image processing techniquescan reduce the work of ophthalmologists and the tools used automatically locate the exudates. Early detection helps the patients to aware of the seriousness of the disease. In this paper we present amethod which...
Article
Full-text available
Thin films of Copper Indium diselenide of different thickness have been deposited on well cleaned glass substrates in a vacuum of 10-5 Torr. The thickness of the deposited films is measured by employing micro balanced method and confirmed by multiple beam interferometric method. The optical properties have been studied in the range 190 nm to2500 nm...
Article
Full-text available
Copper Indium diselenide thin films have been deposited on to well cleaned glass substrates in a vacuum of 10 -5 Torr. The thickness of the films have been determined by micro balanced method and confirmed by multiple beam interferometric method. The structural characterization was carried out by X-ray diffraction (XRD) and Scanning electron micros...
Article
Full-text available
Diabetic retinopathy (DR) is a common retinal complication associated with diabetes. Along with optic disk and blood vessel of normal patients, the diabetic patient's retinal image has exudates. Depending on the severity of diabetics micro aneurysms and hemorrhages may also present. So in the diagnosis of diabetic retinopathy, the detection of exud...
Article
Cadmium sulphide thin films have been deposited on glass substrate by a chemical bath deposition method. An aqueous alkaline bath consisting of cadmium chloride, thiourea, triethanolamine and ammonia. The preparative parameters like ion concentration, temperature, pH and stirring rate have been optimized for getting good quality thin films. The gro...
Article
Full-text available
In retinal image analysis, the detection of optic disk is of paramount importance. It facilitates the tracking of various anatomical features and also in the extraction of exudates, drusens etc., present in the retina of human eye. The health of retina crumbles with age in some people during the presence of exudates causing Diabetic Retinopathy. Th...
Article
Thin films of PbSe are prepared by vacuum deposition technique on to well cleaned glass substrates. The film thicknesses are measured by quartz crystal monitor method. Thin film capacitors of the type (Al-PbSe-Al) have been fabricated. Dielectric studies performed on a stabilized samples of thickness 1000 angstrom and 2000 angstrom at various frequ...
Article
Thin films of PbSe are prepared by vacuum deposition technique on to well cleaned glass substrates. The film thicknesses are measured by quartz crystal monitor method. Thin film capacitors of the type (Al-PbSe-Al) have been fabricated. AC Conduction and Dielectric studies performed on a stabilized samples of thickness 1000Å and 2000Å at various fre...
Article
Using chemical bath deposition (CBD) technique, CdS thin films of different thicknesses were prepared on glass substrates. From x-ray diffraction analysis the structure of the films has been identified as hexagonal. Using energy dispersive x-ray analysis the films prepared has been found as Cd0.96S1.04. Room temperature photoluminescence analysis i...
Article
Full-text available
Copper Indium diselenide thin films have been deposited on to well cleaned glass substrates in a vacuum of 10 -5 Torr. The thicknesses of the films have been determined by micro balanced method and confirmed by multiple beam interferometric method. The EDAX results of the deposited CuInSe 2 films show that the composition of the films is almost the...
Article
Thin films of PbSe of different thickness have been prepared on glass substrates in room temperature by vacuum deposition. The thickness of the deposited films is measured by employing quartz crystal monitor method. PbSe thin film of thickness 500 Ǻ has amorphous structure. When the increase in thickness is from 1000 Ǻ to 2000 Ǻ, the films have pol...
Article
Full-text available
The waste and highly hazardous coal ash from the power plants is proved to be a potential source for the production of low cost mullite glass ceramics when mixed with alumina at very high temperatures produced by plasma. In this present work, the coal ash and alumina are mixed at different weight percentages and treated with high temperature plasma...
Article
The interactions of organic molecules such as acetonitrile, propylene carbonate, and sulfolane on the electrogenerated nickel fluoride films were investigated using cyclic voltammetry and scanning electron microscopy. The effect of water, alkali metal fluorides, fluoride content, and acidity are also reported. Based on these studies, the potential...
Article
We present our findings on the regio- and stereo chemical outcome of the cycloadditions of sterically crowded diphenylacetonitrile oxide towards mono and disubstituted electron deficient and electron rich olefins. The resultant Δ-isoxazolines are further transformed to their corresponding β-hydroxy carbonyl compounds employing Curran's protocol.
Article
Full-text available
Digital image processing encompasses processes whose inputs and outputs are images that extract attributes from images. This paper, 'Performance measure of local operators in fingerprint detection' aims at detecting the edges of fingerprint images. This method uses five local operators namely Sobel, Roberts, Prewitt, Canny and LoG. The edge detecte...
Article
The electrochemical surface transformations and diverse applications of a variety of metals and semiconductors in a wide range of fluoride media such as aqueous, non-aqueous media, liquid HF media, room temperature fluoride melts and molten fluoride media with a melting range covering 50–1000C are reviewed. Nickel shows excellent corrosion resistan...
Article
Full-text available
Voltammetric responses of Ni, Cu, Ag, Pt and glassy carbon (GC) electrodes in triethylamine-tris(hydrogen fluoride) medium in the anodic as well cathodic potential region were investigated. AAS as well as SEM measurements were also made to ascertain the dissolution rate and surface transformation due to fluoride film formation on the electrode surf...
Article
Full-text available
Exudates are one of the most common occurring lesions in diabetic retinopathy. Exudates can be identified as areas with hard white or yellowish colors and varying sizes, shapes and locations near the leaking capillaries within the retina. The detection of exudates is the major goal. For this the pre-requisite stage is the detection of optic disc. O...
Article
Full-text available
Copper Indium Disulphide (CuInS 2) is an absorber material for solar cells and Photovoltaic applications. By suitably doping the material with the suitable dopants such as Bi, Zn, Na, P, Cd, Sn, N, and As its structural, optical, Photoluminescence properties and electrical conductivities could be controlled and modified. It is observed that the fil...
Article
Full-text available
The production of low cost Mullite glass ceramics from silimanite is demonstrated through Hollow Cathode Plasma and Transferred Arc Plasma Processes. The XRD and SEM patterns show that the single phase mullite obtained from TAP and HCP processes are crystalline. The TAP process requires low power input than HCP process. Both processes are superior...
Article
Full-text available
Bi 2 S 3 thin films have been prepared by chemical bath deposition method using Bismuth nitrate and Sodium thiosulphate. Films were deposited onto well cleaned glass substrates with different deposition time periods. The X-ray diffraction pattern revealed that bismuth sulphide thin films exhibit orthorhombic structure. The structural parameters (gr...
Article
Full-text available
Thin films of PbSe of different thicknesses have been prepared on glass substrates at room temperature by vacuum deposition. The thickness of the deposited films was measured by employing quartz crystal monitor method. The optical properties have been studied in the range of wavelength 2500-5000nm.The optical band gap, absorption coefficient extinc...
Article
Full-text available
Thin films of PbSe are prepared by vacuum deposition technique on to well cleaned glass substrates. The film thicknesses are measured by quartz crystal monitor method. There is a blue shift in the PL Spectrum of PbSe thin films of different thicknesses were observed. A strong emission peak is observed at 606 nm. The excitation wavelength was 441 nm...
Article
Full-text available
Copper Indium Disulphide (CuInS 2) is an efficient absorber material for photovoltaic and solar cell applications. In this paper Zn (0.02, 0.03M) doped CuInS 2 thin films are (Cu/In=1.25) deposited on to glass substrates in the temperature range 300-400 0 C. The EDAX results confirm the presence of Cu, In, S and Zn in the films. SEM photographs rev...

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