scholarly journals The effect of 2-propanol on the shifting band gap of ZSM-5-TiO2 composite prepared via sol-gel method

2018 ◽  
Author(s):  
Riskaviana Kurniawati ◽  
Ani Iryani ◽  
Djoko Hartanto
Keyword(s):  
Band Gap ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Bismuth Oxide Prepared by Sol-Gel Method: Variation of Physicochemical Characteristics and Photocatalytic Activity Due to Difference in Calcination Temperature

2020 ◽  
Vol 21 (1) ◽  
pp. 108
Author(s):  
Yayuk Astuti ◽  
Brigita Maria Listyani ◽  
Linda Suyati ◽  
Adi Darmawan
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Calcination Temperature ◽  
Bismuth Oxide ◽  
Sol Gel ◽  
Physicochemical Characteristics ◽  
Band Gap Energy ◽  
Gel Method ◽  
Sol Gel Method ◽  
Body Center Cubic

Research on synthesis of bismuth oxide (Bi2O3) using sol-gel method with varying calcination temperatures at 500, 600, and 700 °C has been done. This study aims to determine the effect of calcination temperature on the characteristics of the obtained products which encompasses crystal structure, surface morphology, band-gap energy, and photocatalytic activity for the decolorization of methyl orange dyes through its kinetic study. Bismuth oxide prepared by sol-gel method was undertaken by dissolving Bi(NO3)3·5H2O and citric acid in HNO3. The mixture was stirred then heated at 100 °C. The gel formed was dried in the oven and then calcined at 500, 600, and 700 °C for 5 h. The obtained products were a pale yellow powder, indicating the formation of bismuth oxide. This is confirmed by the existence of Bi–O and Bi–O–Bi functional groups through FTIR analysis. All three products possess the same mixed crystal structures of α-Bi2O3 (monoclinic) and γ-Bi2O3 (body center cubic), but their morphologies and band gap values are different. The higher the calcination temperature, the larger the particle size and the smaller the band gap value. The accumulative differences in characteristics appoint SG700 to have the highest photocatalytic activity compared to SG600 and SG500 as indicated by its percent degradation value and decolorization rate constant.

Formation Nano Size Ag–TiO2 Composite by Sol–Gel Method and Investigation of Band Gap Decline

2013 ◽  
Vol 5 (10) ◽  
pp. 1039-1043 ◽  
Author(s):  
Mozhgan Hatami ◽  
K. Venkateswara Rao ◽  
Mohsen Ahmadipour ◽  
V. Rajendar
Keyword(s):  
Band Gap ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Nano Size

Blueshift in optical band gap in nanocrystalline Zn1−xCaxO films deposited by sol-gel method

2009 ◽  
Vol 95 (3) ◽  
pp. 031901 ◽  
Author(s):  
Kamakhya Prakash Misra ◽  
R. K. Shukla ◽  
Atul Srivastava ◽  
Anchal Srivastava
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

Preparation of CdS and CdS@Zn3(PO4)2 Nanocomposites by Sol-Gel Method: DFT Study and Effect of Temperature on Band Gap

2020 ◽  
Vol 65 (9) ◽  
pp. 1424-1435 ◽  
Author(s):  
Sandeep Arya ◽  
Asha Sharma ◽  
Anoop Singh ◽  
Aamir Ahmed ◽  
Sarika Mahajan
Keyword(s):  
Band Gap ◽  
Sol Gel ◽  
Dft Study ◽  
Effect Of Temperature ◽  
Gel Method ◽  
Sol Gel Method

EFFECT OF ANNEALING TEMPERATURE ON OPTICAL PROPERTIES OF TITANIUM DIOXIDE THIN FILMS PREPARED BY SOL-GEL METHOD

2012 ◽  
Vol 06 ◽  
pp. 13-18 ◽  
Author(s):  
M. T. SARODE ◽  
P. N. SHELKE ◽  
S. D. GUNJAL ◽  
Y. B. KHOLLAM ◽  
M. G. TAKWALE ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Annealing Temperature ◽  
Optical Measurement ◽  
Sol Gel ◽  
Fesem Image ◽  
Gel Method ◽  
Sol Gel Method ◽  
Crystallite Sizes

TiO 2 thin films were deposited on glass substrates by sol-gel method. Nanocrystalline TiO 2 thin films were prepared at ambient conditions and titanium tetraisopropoxide [ C 12 H 28 O 4 Ti ] was used as a Ti -precursor. The effect of annealing temperature on optical properties of nanocrystalline TiO 2 thin films was studied. The as-deposited films were dried at 100 °C for 1 hr. The films formed were further heated in temperature between 200 and 500 °C for 1 hr. The films were characterized by different techniques: XRD, UV-visible spectroscopy, FTIR spectroscopy and FESEM. The characterization studies revealed that the films are crystallized as anatase phase and nano-structured with better optical properties α = 0.89 as compared to reported data. The optical measurement showed the indirect band gap between 3.31 and 3.35 eV with corresponding crystallite sizes between 8.9 and 3.7 nm. The FESEM image of film annealed at 400 °C showed spherical nanocrystalline structure of TiO 2 particles. The crystallite sizes obtained from FESEM image are found to be between 30 and 100 nm. It is also observed that refractive index of the film increases with increasing the annealing temperature. The smaller crystallite size gives larger band gap due to quantum size effects.

Band gap energies of Li2xMg(1−x)O materials synthesized by the sol–gel method

2013 ◽  
Vol 362 ◽  
pp. 268-270 ◽  
Author(s):  
Nor Fadilah Chayed ◽  
Nurhanna Badar ◽  
Roshidah Rusdi ◽  
Azira Azahidi ◽  
Norlida Kamarulzaman
Keyword(s):  
Band Gap ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

Band Gap Energies of Magnesium Oxide Nanomaterials Synthesized by the Sol-Gel Method

2012 ◽  
Vol 545 ◽  
pp. 157-160 ◽  
Author(s):  
Nurhanna Badar ◽  
Nor Fadilah Chayed ◽  
Rusdi Roshidah ◽  
Norashikin Kamarudin ◽  
Norlida Kamarulzaman
Keyword(s):  
Band Gap ◽  
Magnesium Oxide ◽  
Sol Gel ◽  
Nir Spectroscopy ◽  
Band Gap Energy ◽  
Heating Time ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method

In this work, the band gap energies of magnesium oxide (MgO) were investigated to see if calcination time affects the band gap energies of the MgO. MgO nanomaterials have been prepared by a sol-gel method. MgO precursors produced were calcined at a temperature of 600 °C for 24 hours and 48 hours. The structural characterization of samples is achieved using X-Ray Diffraction (XRD) and the morphology as well as particle size of MgO were examined by Field Emission Scanning Electron Microscopy (FESEM). UV-Vis NIR spectroscopy was used to determine the band gap energies of the materials. From the results, the band gap energy of the MgO with a longer heating time exhibited a higher value.

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.

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