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- 저자 : Karrothu Varun Kumar (검색결과 2 건)
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Das, Bidhu Bhusan,Palanisamy, Kuppan,venugopal, Potu,Sandeep, Eesam,Kumar, Karrothu Varun Korean Chemical Society 2017 대한화학회지 Vol.61 No.1
Formation of Au particles in nonstoichiometric $Cu_{2-x}{^I}Cu{_2}^{II}O_{3-{\delta}}$ ($x{\approx}0.20$; ${\delta}{\approx}0.10$) oxide from aniline + hydrochloric acid mixtures and chloroauric acid in the ratios 30 : 1; 60 : 1; 90 : 1 (S1-S3) by volume and 0.01 mol of copper acetate, $Cu(OCOCH_3)_2.H_2O$, in each case is performed by sol-gel growth. Powder x-ray diffraction (XRD) results show Au particles are dispersed in tetragonal nonstoichiometric dicopper (I) dicopper (II) oxides, $Cu_{2-x}{^I}Cu{_2}^{II}O_{3-{\delta}}$ ($x{\approx}0.20$; ${\delta}{\approx}0.10$). Average crystallite sizes of Au particles determined using Scherrer equation are found to be in the approximate ranges ${\sim}85-140{\AA}$, ${\sim}85-150{\AA}$ and ${\sim}80-150{\AA}$ in S1-S3, respectively which indicate the formation of Au nano-micro size particles in $Cu_{2-x}{^I}Cu{_2}^{II}O_{3-{\delta}}$ ($x{\approx}0.20$; ${\delta}{\approx}0.10$) oxides. Hysteresis behaviour at 300 K having low loop areas and magnetic susceptibility values ${\sim}5.835{\times}10^{-6}-9.889{\times}10^{-6}emu/gG$ in S1-S3 show weakly ferromagnetic nature of the samples. Broad and isotropic electron paramagnetic resonance (EPR) lineshapes of S1-S4 at 300, 77 and 8 K having $g_{iso}$-values ${\sim}2.053{\pm}0.008-2.304{\pm}0.008$ show rapid spin-lattice relaxation process in magnetic $Cu^{2+}$ ($3d^9$) sites as well as delocalized electrons in Au ($6s^1$) nano-micro size particles in the $Cu_{2-x}{^I}Cu{_2}^{II}O_{3-{\delta}}$ ($x{\approx}0.20$; ${\delta}{\approx}0.10$) oxides. Broad and weak UV-Vis diffuse reflectance optical absorption band ~725 nm is assigned to $^2B_{1g}{\rightarrow}^2A_{1g}$ transitions, and the weak band ~470 nm is due to $^2B_{1g}{\rightarrow}^2E_g$ transitions from the ground state $^2B_{1g}$(${\mid}d_{x^2-y^2}$>) of $Cu^{2+}$ ($3d^9$) ions in octahedral coordination having tetragonal distortion.
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Formation of Au Particles in Cu2−xICu2IIO3−δ (x ≈ 0.20; δ ≈ 0.10) Oxide Matrix by Sol-Gel Growth
Bidhu Bhusan Das,Kuppan Palanisamy,Potu venugopal,Eesam Sandeep,Karrothu Varun Kumar 대한화학회 2017 대한화학회지 Vol.61 No.1
Formation of Au particles in nonstoichiometric Cu2−x ICu2 IIO3−δ (x ≈ 0.20; δ ≈ 0.10) oxide from aniline + hydrochloric acid mixtures and chloroauric acid in the ratios 30 : 1; 60 : 1; 90 : 1 (S1-S3) by volume and 0.01 mol of copper acetate, Cu(OCOCH3)2.H2O, in each case is performed by sol-gel growth. Powder x-ray diffraction (XRD) results show Au particles are dispersed in tetragonal nonstoichiometric dicopper (I) dicopper (II) oxides, Cu2−x ICu2 IIO3−δ (x ≈ 0.20; δ ≈ 0.10). Average crystallite sizes of Au particles determined using Scherrer equation are found to be in the approximate ranges ~85−140 Å, ~85−150 Å and ~80−150 Å in S1-S3, respectively which indicate the formation of Au nano-micro size particles in Cu2−x ICu2 IIO3−δ (x ≈ 0.20; δ ≈ 0.10) oxides. Hysteresis behaviour at 300 K having low loop areas and magnetic susceptibility values ~ 5.835×10−6 −9.889×10−6 emu/gG in S1-S3 show weakly ferromagnetic nature of the samples. Broad and isotropic electron paramagnetic resonance (EPR) lineshapes of S1-S4 at 300, 77 and 8 K having giso-values ~2.053±0.008−2.304±0.008 show rapid spin-lattice relaxation process in magnetic Cu2+ (3d9) sites as well as delocalized electrons in Au (6s1) nano-micro size particles in the Cu2−x ICu2 IIO3−δ (x ≈ 0.20; δ ≈ 0.10) oxides. Broad and weak UV-Vis diffuse reflectance optical absorption band ~725 nm is assigned to 2B1g→ 2A1g transitions, and the weak band ~470 nm is due to 2B1g→ 2Eg transitions from the ground state 2B1g (|dx 2 -y 2>) of Cu2+ (3d9) ions in octahedral coordination having tetragonal distortion.
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