International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
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One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
Effect of Laser Induced Tin Oxide (SnO2) Nano particle N. Ravi and R. Maridurai Department of physics, St.Joseph’s College, Tiruchirappalli-620002, India. nr_sjc@yahoo.com , maridurai18@gmail.com --------------------------------------------------------------***--------------------------------------------------------------mainly dependent on particle size. With the use lasers on Abstract-The study of Nano particles and its influence
metal oxides give further enhancement in band gap energy and this can be achieved with the use of suitable laser processing parameters such as laser power, scan speed .,etc. This paper investigates, the effect of with and without laser irradiation on SnO2nano particles with different time exposures. The structural analysis of laser treated samples of SnO2particles were studied using xray diffraction as well as spectroscopic investigation such as UV and FTIR were also studied. Dielectric properties of the samples for various frequencies are also investigated. DLS spectra and SEM the particle size investigated.
with laser plays a major role in material characterisation. Particularly, metal oxide semiconducting materials are low cost and have significant properties in laser materials processing. Now in this study, we report the synthesis and influence of laser treated Nano powder SnO 2. The laser treated SnO2 samples were characterized by X-ray diffraction, UV-Visible absorption, FTIR spectra, Dielectric studies, DLS spectra and SEM. From the X-ray analysis, we observed that the laser treated SnO2is with the structure of tetragonal rutile crystalline and the crystalline size is in the range of 4-6nm. The UV-Vis spectrum confirms the presence of nanoparticles in the range 191-193 nm. The optical band gap values of SnO2 nanoparticles were calculated about 3.5-3.8eV. Fourier Transform Infrared spectroscopy reveales, the presence of tin oxide (SnO 2).The dielectric studies of laser treated samples of SnO 2 show appreciable results compared to samples without laser irradiation. Dynamic light scattering (DLS) studies revealed that the particle size distribution of Tin oxide SnO2 nano-particles size in the range 8.8 nm - 62.5 nm. The SEM analysis of Tin oxide (SnO2) nanoparticle also shows that the structure is tetragonal rutile in shape. The particle size varies from 20 nm – 161.2 nm.
2. EXPERIMENTAL PROCEDURE Commercially available SnO2 powder (SigamaAldrich,99.9% purity) is used for investigation (composition is given in Table-1).Laser treatments are carried out by using 5.0mw low power He-Ne gas laser with red light of (wavelength 633nm) and diode laser with green light of 5mw power (wave length 532nm).The structural analysis of with and without laser irradiated samples are analysed using PANalytical’s Xray diffractometers(copper Kα radiation of wave length λ as A and A).This system recorded the intensity as a function of Bragg’s angle While the average crystalline size of the particles can be estimated using full width at half maximum (FWHM) value of the xray diffraction peaks. The optical and spectroscopic investigation of the samples such as UV and FTIR studies are performed using Perkin Elmer UV/VIS spectrophotometer (λ ) and Perkin Elmer FT-IR spectrometer. The Dielectric studies are performed using Digital LCRZ Meter TH2816A (50Hz - 200KHz) with various frequencies. The DLS spectra (Measuring the Particle Size Distribution) recorded by Particulate system Nano plus Zeta/nano particle analyzer instrument. SnO2 nano particles are analysed using SEM (ZEISS SEM instrument) Micrographs. The laser processing parameters used for laser irradiation of samples are given in Table-2 and the properties of sample used is given in Table-3.
Key Words: Structural, Optical and Dielectric properties of SnO2 nanoparticles Laser irradiation.
1. INTRODUCTION Metal oxide semiconductor SnO2 attracts greater attention because of high conductivity, transparency and sensitivity. In recent years, influence of laser on semiconductors finds a newer dimension in material science. Particularly, selective laser melting is a powder based additive manufacturing capable of producing industrial applications. Currently there is a greater interest in industry for generating objects with high geometrical complexity [1]SnO2 particles, yield wide band gap and is mainly due to its chemical, electronic and optical properties[2 ] and also due its nano structured form[ 4 ].This material has a wide range of applications from gas sensors, liquid crystals, photovoltaic cells and conducting electrodes. In general, the band gap energy of semiconducting Nano crystals is
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