Effects of phosphorus-doping on energy band-gap, structural, surface, and photocatalytic characteristics of emulsion-based sol-gel derived TiO 2 nano-powder

2017 ◽  
Vol 414 ◽  
pp. 277-291 ◽  
Author(s):  
Ibram Ganesh
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Sol Gel ◽  
Energy Band Gap ◽  
Phosphorus Doping ◽  
Nano Powder ◽  
Structural Surface

scholarly journals Study and Characterization of Polystyrene/Titanium Dioxide Nanocomposites (PS/TiO2 NCs) for Photocatalytic Degradation Application: a Review

2018 ◽  
Vol 7 (4.30) ◽  
pp. 538 ◽  
Author(s):  
Maytham Qabel Hamzah ◽  
Salim Oudah Mezan ◽  
Alaa Nihad Tuama ◽  
Abdullah Hasan Jabbar ◽  
Mohd Arif Agam
Keyword(s):  
Laser Radiation ◽  
Photocatalytic Degradation ◽  
Band Gap ◽  
Energy Band ◽  
Sol Gel ◽  
Dip Coating ◽  
Sem Analysis ◽  
Energy Band Gap ◽  
Melt Compounding ◽  
Composite Energy

Synthetic polymer/TiO2 composite such as Polystyrene/TiO2 has become recent highly research materials due to its potential and significant application in various fields. we can tune the polymer and nanoparticles by different techniques such as change the materials concentration, Exposure of materials to laser radiation, Exposure of materials to laser radiation, especially in tuning the polystyrene/TiO2 composite energy band gap. In this review, several methods of preparation are briefly explored such as pan-milling, precipitation, melt compounding, dip-coating, solution cast, and sol-gel method. Some recent advancement that focuses on the two basic elements: polymer and TiO2 are also included especially discussing on photocatalytic degradation that introduces photon as manipulate parameter to tune the polymer/TiO2 composite energy band gap. Scanning electron microscope (SEM) analysis of various polymer/TiO2 (type n concentration) and Polystyrene/TiO2 (concentration and nanoparticles sizes) are the focus of the discussion before exposure to laser radiation as photodegradation source.   

Influence Different Compositions of (1-x)ZnFe2O4 – xSiO2 Nanostructures Thin Film Synthesized by Sol-Gel Method

2016 ◽  
Vol 846 ◽  
pp. 607-613
Author(s):  
Mohd Syafiq Zulfakar ◽  
Huda Abdullah ◽  
Wan Nasarudin Wan Jalal ◽  
Zalita Zainuddin ◽  
Sahbudin Shaari
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Dielectric Material ◽  
Sol Gel ◽  
Dielectric Substrate ◽  
Face Centered Cubic ◽  
Energy Band Gap ◽  
Gel Method ◽  
Sol Gel Method ◽  
Result Analysis

SiO2 compound was introduced into zinc ferrite using formula (1-x)ZnFe2O4 – xSiO2 synthesized by sol-gel method where distilled water and citric acid was used as a solvent and binder agent. The produced samples were annealed at 450 °C for 1h. The AFM result analysis show that the average surface roughness and particle size decreased as the compositions of x was increased. XRD results analysis confirmed the formation of spinel structures with crystallite size within range 11.27 – 4.72 nm. UV-Vis analysis to determine the energy band gap of the (1-x)ZnFe2O4 – xSiO2 samples. It shows that the energy band gap increased as the composition of SiO2 was increased due to the dielectric properties of silicon dioxide. FTIR results analysis exhibit common band in the range of 400 – 4000 cm-1. The observed band near 2350 cm-1 shows the presence of oxygen-oxygen bond in the face centered cubic (fcc) crystal lattice of oxygen atoms. The addition of SiO2 into ZnFe2O4 will help to enhance the morphological structures and optical properties. This new proposed dielectric material can be used as dielectric substrate microstrip patch antenna.

Investigation of energy band gap and its correlation with vacancy defects in Pb1-xNixO nanoparticles synthesized through sol-gel method

2021 ◽  
Vol 100 (1) ◽  
pp. 89-100
Author(s):  
Sk Irsad Ali ◽  
Anjan Das ◽  
Dhanadeep Dutta ◽  
Ajit Das ◽  
Nagendranath Mahata ◽  
...  
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Sol Gel ◽  
Energy Band Gap ◽  
Vacancy Defects ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Sol-Gel Synthesis, Crystal Structure, Electronic and Magnetic Properties of AlxTi1-xBiO3 (0.0 ≤x≤ 0.33) Oxides

2016 ◽  
Vol 8 (3) ◽  
pp. 1680-1691
Author(s):  
Bidhu Bhusan Das ◽  
Ruppa Govinda Rao
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Density Functional ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Unit Cell ◽  
Ionic Character ◽  
Energy Band Gap ◽  
Density Mapping ◽  
Crystallite Sizes

Synthesis of AlxTi1-xBiO3 (0.0 ≤x≤ 0.33) (S1-S4: x = 0.0, 0.11, 0.22, 0.33) oxides is performed by sol-gel method via nitrate-citrate route. Analysis of the powder X-ray diffraction (XRD) patterns show tetragonal unit cell with lattice parameters: a = 6.6377, 6.6398, 6.6370, 6.6366 Å; c = 6.5445, 6.5391, 6.5259, 6.6583 Å, respectively in S1-S4, with space group P42/mnm and Z=4. Average crystallite sizes determined by Scherrer relation are found to be in the range ~16-36, 18-50, 19-48 and 19-41 nm in S1-S4, respectively. On Rietveld refinement of unit cell structures the agreement factors are lowered to: Rp= 98.28, 97.65, 98.85, 94.29 %; Rwp= 97.11, 96.76, 97.92, 95.73 %; Rexp= 0.09, 0.09, 0.09, 0.09 % in S1-S4, respectively. Fourier electron density mapping show irregular contours around Bi3+, Ti3+ and O2- ions due to significant ionic character in Ti-O and Bi-O bonds in the materials. Presence of hysteresis loops in the range -6 kG to +6 kG at 300 K with magnetic susceptibility values in the range 5.926 x 10-8 - 6.461 x 10-8 emu/gG in S1-S4 show soft ferromagnetic nature of the oxides. Density functional theory (DFT) calculations using CASTEP (Cambridge Serial Total Energy Package) programme package show energy band gap, Eg,  ~ 0.01-0.02 eV indicating weak semiconducting nature of the oxides. The valence band (VB) predominantly comprises O 2p, Ti 3d, Al 3p and Bi 6p orbitals, and the conduction band (CB) comprises mostly O 2p, Al 3p and Bi 6p orbitals with extension of band tails narrowing the energy band gap.

scholarly journals Lattice Dynamics and Transport Properties of Multiferroic DyMn2O5

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Javed Ahmad ◽  
Syed Hamad Bukhari ◽  
M. Tufiq Jamil ◽  
Mehr Khalid Rehmani ◽  
Hammad Ahmad ◽  
...  
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Sol Gel ◽  
Energy Band Gap ◽  
Phonon Modes ◽  
Visible Absorption ◽  
Atomic Vibrations ◽  
Uv Visible ◽  
P Type ◽  
Method Analysis

We have investigated the optical and electrical properties of polycrystalline DyMn2O5synthesized by sol-gel method. Analysis of the reflectivity spectrum has led to the observation of 18 infrared (IR) active phonon modes out of 36 predicted ones. We discuss the results in terms of different phonon bands originated as a result of atomic vibrations. Moreover, the optical energy band gap ofEg(OC)~1.78 eV has been estimated from optical conductivity(σ1(ω))spectrum. The energy band gap and optical transitions were also determined from UV-visible absorption spectrum and band gap ofEg(UV)~1.57 eV was estimated. Moreover, DC electrical resistivity shows the p-type polaronic conduction above room temperature.

scholarly journals No Resistive Normal Electrons in Beginning Superconducting States

Mathematics ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1512
Author(s):  
Changho Seo ◽  
Seongsoo Cho ◽  
Je Huan Koo
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Energy Band Gap

We investigate why normal electrons in superconductors have no resistance. Under the same conditions, the band gap is reduced to zero as well, but normal electrons at superconducting states are condensed into this virtual energy band gap.

Energy Band Gap Studies of CdS Nanomaterials

2008 ◽  
Vol 3 ◽  
pp. 97-102 ◽  
Author(s):  
Dinu Patidar ◽  
K.S. Rathore ◽  
N.S. Saxena ◽  
Kananbala Sharma ◽  
T.P. Sharma
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Energy Band ◽  
Chemical Method ◽  
Optical Absorption Spectroscopy ◽  
Cds Nanoparticles ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Simple Chemical

The CdS nanoparticles of different sizes are synthesized by a simple chemical method. Here, CdS nanoparticles are grown through the reaction of solution of different concentration of CdCl2 with H2S. X-ray diffraction pattern confirms nano nature of CdS and has been used to determine the size of particle. Optical absorption spectroscopy is used to measure the energy band gap of these nanomaterials by using Tauc relation. Energy band gap ranging between 3.12 eV to 2.47 eV have been obtained for the samples containing the nanoparticles in the range of 2.3 to 6.0 nm size. A correlation between the band gap and size of the nanoparticles is also established.

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