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The effect of lattice strain on structural, optical and electrical properties of KTiOPO4 nanoparticles synthesized by PVA as capping agent
Poster Presentation
Authors
Basic science Department, Narjes university, Technical and Vocational university,Semnan, Iran
Abstract
KTiOPO4 nanoparticles are known as the best candidate to utilize for second-harmonic generation in multiphoton microscopes and bio labels. Size and shape are important and effective parameters to control the properties of nanoparticles. precise control of the size, shape, and quality of nanocrystals, results in desired chemical and physical properties. In this paper by controlling the relative rate of nucleation and nuclei growth during the synthesis process, shape, size, and quality of productions will be controlled. KTP nanoparticles were synthesized by the co-precipitation method. Polyvinyl alcohol was used as a capping agent. polymers as a capping agent can greatly control the diffusion, growth process, and growth kinetics so size and morphology of obtained nanoparticles will be controlled. PVA acts as a holding matrix and was used to control the size, morphology, and size distribution of productions.
Different mole ratios of polyvinyl alcohol to titanium ion (1:1, 2:1, 3:1) were used to control the growth kinetics. Produced KTP nanocrystals were studied by X-ray diffraction, FT-IR, UV-Vis, and FE-SEM analyses to examine their structural, optical, and morphological properties. The dielectric property of productions was measured using the parallel plate capacitor method. X-ray diffraction patterns confirmed the formation of the KTP structure with the orthorhombic phase. The biggest (49.50 nm) and smallest (19.52 nm) grain sizes were obtained by 2:1 and 3:1 mole ratios of capping agent, respectively. The lattice parameters rotation was observed at 2:1 mole ratio of PVA. Sample PVA3:1 showed the highest optical transparency. Results showed the lowest optical and structural properties belong to 2:1 mole ratio of polyvinyl alcohol. The biggest bandgap (6.33) and lowest lattice strain (0.0034) were observed at 3:1 mole ratio of the capping agent. Different mole ratios of capping agent showed various morphology of obtained KTP nanocrystals such as polyhedral, rod, and oval-forms. It is observed that the biggest dielectric constant (165.96×104) belong to sample PVA1:1.
Different mole ratios of polyvinyl alcohol to titanium ion (1:1, 2:1, 3:1) were used to control the growth kinetics. Produced KTP nanocrystals were studied by X-ray diffraction, FT-IR, UV-Vis, and FE-SEM analyses to examine their structural, optical, and morphological properties. The dielectric property of productions was measured using the parallel plate capacitor method. X-ray diffraction patterns confirmed the formation of the KTP structure with the orthorhombic phase. The biggest (49.50 nm) and smallest (19.52 nm) grain sizes were obtained by 2:1 and 3:1 mole ratios of capping agent, respectively. The lattice parameters rotation was observed at 2:1 mole ratio of PVA. Sample PVA3:1 showed the highest optical transparency. Results showed the lowest optical and structural properties belong to 2:1 mole ratio of polyvinyl alcohol. The biggest bandgap (6.33) and lowest lattice strain (0.0034) were observed at 3:1 mole ratio of the capping agent. Different mole ratios of capping agent showed various morphology of obtained KTP nanocrystals such as polyhedral, rod, and oval-forms. It is observed that the biggest dielectric constant (165.96×104) belong to sample PVA1:1.
Keywords
Potassium titanyl phosphate; Co-precipitation method; capping agent; Poly vinyl alcohol; Growth kinetics; Lattice strain; physical properties; nanoparticles