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Relationship between Physical Properties and Photocatalytic behavior of DMS SnO2: Cr Nanoparticles
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Jamal Mazloom   , Farhad Esmaeili ghodsi , Hosein Golmojdeh , Majedeh Mahinzad |
| university of guilan |
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Abstract: (1048 Views) |
| Cr–doped SnO2 nanoparticles (SnO2: Cr NPs) synthesized by sol-gel process. Influence of structural parameters, intrinsic and extrinsic defects of NPs on physical properties and photocatalytic performance of nanoparticles were investigated by various analytical techniques. X-ray photoelectron spectra revealed that Cr ions incorporated in SnO2 lattice with chemical state of +3. The X-ray diffraction analysis disclosed that crystallite size and lattice parameters reduced slightly while dislocation density increased by Cr doping. The isotropic (anisotropic) lattice strain, crystallite size, young modulus, lattice deformation stress, and deformation energy density of nanoparticles were estimated by XRD line profile analysis using modified Williamson–Hall method assuming the isotropic strain model (ISM), anisotropic strain model (ASM) and energy density model (EDM). The tensile strain of SnO2 reduced by Cr doping and converted to compressive strain for higher doping level. Transmission Electron Microscopy (TEM) micrographs confirmed that average particle size reduces by Cr doping. Ferromagnetic behavior was observed in low level Cr-doped SnO2 NPs at room temperature and saturation magnetization decreased as doping level to 5 mol% increased. Band gap narrowing, mid-gap state absorption in UV-Vis spectra, and transition from tensile to compressive strain proved that the oxygen vacancies/extrinsic defects (Cr 2p) and microstrain play an important role in weak ferromagnetism and enhanced photodegradation of Cr doped SnO2 nanoparticles against rhodamine B (RhB) and methylene blue (MB) dyes. |
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| Keywords: Cr–doped SnO2, Sol-gel, DMS, Photocatalysis, modified Williamson-Hall method |
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Full-Text [PDF 2351 kb]
(771 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2019/08/20 | Accepted: 2020/09/14 | Published: 2020/09/14
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