Characterization of electronic structure and defect states of thin epitaxial BiFeO3 films by UV-visible absorption and cathodoluminescence spectroscopies

2008 ◽  
Vol 92 (22) ◽  
pp. 222901 ◽  
Author(s):  
A. J. Hauser ◽  
J. Zhang ◽  
L. Mier ◽  
R. A. Ricciardo ◽  
P. M. Woodward ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Defect States ◽  
Visible Absorption ◽  
Uv Visible

Synthesis of Fluorescent Magnetic and Plasmonic-Hybrid Multifunctional Nanopaticles

2014 ◽  
Vol 1081 ◽  
pp. 161-164
Author(s):  
Xue Mei Li ◽  
Zheng Guan ◽  
Hong Ling Liu ◽  
Jun Hua Wu ◽  
Xian Hong Wang ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Zno Nanoparticles ◽  
Poly Ethylene Glycol ◽  
Visible Absorption ◽  
Transmission Electron ◽  
Good Magnetic Property ◽  
Uv Visible ◽  
Poly Ethylene ◽  
Poly Propylene

FeAu/ZnO nanoparticles were successfully synthesized by nanoemulsion process with the use of poly (ethylene glycol)-block-poly (propylene glycol)-block-poly (ethylene glycol) as the surfactant. The characterization of the FeAu/ZnO nanoparticles was performed using X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and UV-visible absorption spectroscopy, showing that the polymer-laced nanoparticles reveal high crystallinity, excellent dispersibility and well defined optical performance. The process of solvent dispersion-collection of FeAu/ZnO nanoparticles indicates that the nanoparticles possess good magnetic property for applications.

scholarly journals Photoluminescence of Pentavalent Uranyl Amide Complexes

2021 ◽  
Author(s):  
Fabrizio Ortu ◽  
simon Randall ◽  
David J. Moulding ◽  
Adam woodward ◽  
Karsten Meyer ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Charge Transfer ◽  
Synthesis And Characterization ◽  
New Family ◽  
Theoretical Investigations ◽  
Charge Transfer Transitions ◽  
Uv Visible ◽  
First Time

We report the synthesis and characterization of a new family of pentavalent uranyl amide complexes, supported also by photoluminescence and theoretical investigations. These studies reveal for the first time that the UV-visible emission of uranyl(V) is an admixture of charge transfer transitions accompanied by vibronic coupling of the quartet excited state with uranyl oxo and amide vibrations, thereby offering new insights into the electronic structure of the reactive uranyl(V)

scholarly journals STUDI PENGARUH PERBANDINGAN REAKTAN LIGNIN NaHSO3 DAN pH TERHADAP NATRIUM LIGNOSULFONAT (NaLS)

2015 ◽  
Vol 1 (2) ◽  
pp. 133
Author(s):  
Gustini Syahbirin ◽  
Ani Suryani ◽  
Tesar Dzikrulloh
Keyword(s):  
Functional Group ◽  
Black Liquor ◽  
Sodium Lignosulfonate ◽  
Visible Absorption ◽  
Concrete Admixtures ◽  
Initial Ph ◽  
Soda Pulping ◽  
Uv Visible ◽  
Soda Lignin

 ABSTRACT Lignin was isolated from waste black liquor of soda pulping process. Sulfonation of soda lignin produced Sodium Lignosulfonate (NaLS) which can be used as dispersants, and concrete admixtures. In this research, sulfonation was carried out towards lignin with ratio of lignin-NaHSO3 of 1.0:0.4; 1.0:0.5; and 1.0:0.6, and initial pH of 5.00; 6.00; 7.00. Parameters observed were purity, final pH, and yield of NaLS. The upsurge of initial pH increased the final pH and NaLS yield, but decreased its purity. The upsurge of ratio of lignin-NaHSO3 increased NaLS yield and decreased its purity, but did not affect the final pH of NaLS. The chosen optimum condition was on pH of 6.00 and ratio of lignin-NaHSO3 of 1.0:0.6. Characterization of functional group using FTIR, and purity of NaLS using UV-Visible Absorption Spectrophotometer. Keywords: soda lignin, sulfonation of lignin, sodium lignosulfonate 

scholarly journals Synthesis and Characterization of New Palladium(II) Schiff Base Complexes Derived from β-Diketones and Diamines

2020 ◽  
Vol 32 (5) ◽  
pp. 1039-1042
Author(s):  
Mridula Gupta ◽  
Sheela M. Valecha
Keyword(s):  
Schiff Base ◽  
Schiff Base Complexes ◽  
Schiff Base Ligands ◽  
Visible Absorption ◽  
Oh Groups ◽  
Uv Visible ◽  
Coordinated Water ◽  
Heterocyclic Schiff Bases ◽  
Phenolic Oh Groups

A new series of heterocyclic Schiff bases were prepared from condensation of 1-phenyl-3-methyl-4-acetyl/benzoyl-pyrazolone with 4,4′-diaminodiphenylmethane and 4,4′-diaminodiphenyl ether, resulting in the formation of four novel Schiff base ligands. These ligands were then treated with ethanolic solution of PdCl2, to form corresponding palladium(II) complexes. These complexes were characterized by elemental analysis, IR, 1H NMR, TGA, magnetic susceptibility measurements and UV-visible absorption spectroscopy. All the Pd(II) complexes were found to have one coordinated water molecule. Schiff base ligands chelated with the metal atom through two donor sites N and O of azomethine (-C=N-) and phenolic (-OH) groups, respectively.

Pyridone substituted phthalocyanines: Photophysico-chemical properties and TD-DFT calculations

2018 ◽  
Vol 22 (01n03) ◽  
pp. 25-31 ◽  
Author(s):  
Şaziye Abdurrahmanoğlu ◽  
Mevlüde Canlıca ◽  
John Mack ◽  
Tebello Nyokong
Keyword(s):  
Electronic Structure ◽  
Nmr Spectroscopy ◽  
Dft Calculations ◽  
Chemical Properties ◽  
Quantum Yields ◽  
Visible Absorption ◽  
H Nmr ◽  
Td Dft ◽  
Ft Ir ◽  
Uv Visible

4-(6-methyl-3-nitro-2-oxo-1,2-dihydropyridin-4-yloxy)phthalonitrile has been used to prepare a novel Zn(II) phthalocyanines with four peripheral pyridone substituents. The compound has been characterized by UV-visible absorption, FT-IR and [Formula: see text]H-NMR spectroscopy, elemental analysis and MALDI-TOF mass spectroscopy. The fluorescence, triplet quantum and singlet oxygen quantum yields have been determined and TD-DFT calculations have been used to identify trends in the electronic structure.

The Research of Gas-Sensing and Optical Characterization of Chlorinated Metallic Porphyrin Spin-Coated Films

2012 ◽  
Vol 531-532 ◽  
pp. 58-62 ◽  
Author(s):  
Wen Yao Yang ◽  
Jian Hua Xu ◽  
Si Yu Wang ◽  
Yan Chen
Keyword(s):  
Sensor Array ◽  
Gas Sensing ◽  
Spectral Response ◽  
Visible Absorption ◽  
Gas Sensor Array ◽  
Volatile Organic ◽  
Uv Visible ◽  
J Aggregates ◽  
Quartz Substrates

In this text, the Chlorinated metallic porphyrin (TPPMncl and TPPFecl) thin films were fabricated by Spin-coated technique onto quartz substrates. In order to search for the gas-sensing characterization of Chlorinated metallic porphyrin Spin-coated films, the changes of UV-Visible absorption spectrums of TPPMncl and TPPFecl Spin-coated films respectively exposed in vapor of Chloroform, pyridine, Ammonia, triethylamine and dimethylamine were analyzed. The experimental results show that, the spectral response of TPPMncl and TPPFecl on organic gas molecular is obviously found. And we know that chlorinated metallic porphyrin film formed the J-aggregates. Moreover, through two kinds of chlorinated metallic porphyrin integral area rate of histogram, it is easy to identify and distinguish between the four kinds of volatile organic compounds. It indicates that these Chlorinated metallic porphyrin have gasochromic characteristics while responding with organic gas. Therefore, these materials can be prepared into gas sensor array for detecting VOCS.

Synthesis of Cadmium and its Oxide Nanomaterials by Pulsed Laser Ablation in Aqueous Media

2008 ◽  
Vol 1074 ◽  
Author(s):  
Subhash Chandra Singh ◽  
Rajkumar Swarnkar ◽  
Ram Gopal
Keyword(s):  
Laser Ablation ◽  
Colloidal Solution ◽  
Aqueous Media ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Distilled Water ◽  
Visible Absorption ◽  
Cadmium Metal ◽  
Uv Visible

ABSTRACTCadmium based oxide and hydroxide nanocomposites material is synthesized by pulsed laser ablation of cadmium metal in the double distilled water. A piece of cadmium metal, placed on the bottom of glass vessel containing double distilled water, was irradiated with 1064 nm of pulsed Nd:YAG laser operating at 35 mJ/pulse energy and 10 ns pulse width for 30 minutes. Colloidal solution of produced Nanoparticles is found stable for two days. Fine white colored powder is obtained after drying centrifuged solution. UV-visible absorption of colloidal solution, XRD, TGA, DTA and FTIR of the powder is used for the characterization of material. Possible mechanism of synthesis and hydroxide to oxide transition is discussed.

Tetra-2,3-pyrazinoporphyrazines with externally appended pyridine rings. 18. Physicochemical properties and photochemical behavior of new uncharged water soluble low-symmetry macrocycles [{Pd(OAc)2}3(PtCl2)LM] (M = MgII(H2O), ZNII, PdII)

2017 ◽  
Vol 21 (04-06) ◽  
pp. 334-344 ◽  
Author(s):  
Maria Pia Donzello ◽  
Fabio Gigante ◽  
Fabiola Sciscione ◽  
Elisa Viola ◽  
Karl M. Kadish
Keyword(s):  
Physicochemical Characterization ◽  
Water Soluble ◽  
Experimental Conditions ◽  
Visible Absorption ◽  
New Class ◽  
Enhanced Solubility ◽  
Uv Visible ◽  
Low Symmetry ◽  
Visible Absorption Spectroscopy

The synthesis and physicochemical characterization of a new class of low-symmetry water soluble heteropentanuclear porphyrazine complexes are described. The investigated compounds, represented as [{Pd(OAc)[Formula: see text]}[Formula: see text](PtCl[Formula: see text]LM] •xH[Formula: see text]O where L [Formula: see text] tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazinato dianion, M [Formula: see text] Mg[Formula: see text](H[Formula: see text]O), Zn[Formula: see text] or Pd[Formula: see text] and [Formula: see text] 3–8, were prepared under mild experimental conditions from the previously described heterobimetallic compounds [(PtCl[Formula: see text]LM]. Peripheral binding of one PtCl[Formula: see text]and three Pd(OAc)[Formula: see text]units in the new series of compounds occurs at the vicinal pyridine N atoms of each dipyridinopyrazine fragment via a “py–py” coordination. The newly synthesized porphyrazines were characterized by IR measurements in the solid state and UV-visible absorption spectroscopy in the polar nonaqueous solvents pyridine, dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) as well as in water, the enhanced solubility in this medium being due to the presence of the external Pd(OAc)[Formula: see text] moieties. Data on the photosensitizing activity of the compounds for the generation of singlet oxygen, [Formula: see text]O[Formula: see text] were also obtained in DMF and should be of interest to researchers in the area of photodynamic therapy.

scholarly journals Photoluminescence of Pentavalent Uranyl Amide Complexes

2021 ◽  
Author(s):  
Fabrizio Ortu ◽  
simon Randall ◽  
David J. Moulding ◽  
Adam woodward ◽  
Karsten Meyer ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Charge Transfer ◽  
Synthesis And Characterization ◽  
New Family ◽  
Theoretical Investigations ◽  
Charge Transfer Transitions ◽  
Uv Visible ◽  
First Time

We report the synthesis and characterization of a new family of pentavalent uranyl amide complexes, supported also by photoluminescence and theoretical investigations. These studies reveal for the first time that the UV-visible emission of uranyl(V) is an admixture of charge transfer transitions accompanied by vibronic coupling of the quartet excited state with uranyl oxo and amide vibrations, thereby offering new insights into the electronic structure of the reactive uranyl(V)

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