Spinach Ferredoxin (Fdx) as an Organic Material to Improve Optical Band Gap of Chitosan (Cs) Biofilm

2015 ◽  
Vol 754-755 ◽  
pp. 939-943
Author(s):  
Devi Shantini Chandrasakaran ◽  
Irwana Nainggolan ◽  
Mohd Nazree Derman ◽  
Tulus Ikhsan Nasution
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Spin Coating ◽  
Organic Material ◽  
Optical Band Gap ◽  
Band Gaps ◽  
Coating Technique ◽  
Optical Band Gaps ◽  
Chitosan Matrix ◽  
Straight Line

In this study, the effect of spinach-ferredoxin addition in chitosan matrix towards optical band gap was investigated. 5 distinct solutions were prepared by blending chitosan and spinach-ferredoxin (Cs-Fdx) with the volume to volume ratios of 100:0, 95:5, 90:10, 85:15 and 80:20 respectively. The solutions were cast into film via spin coating technique. The optical properties in terms of absorbance for these films were investigated using UV-Vis Spectrometer. UV-Vis result showed that the absorbance increased as the spinach-ferredoxin content increases. Finally, the optical band gaps of the films were determined by extrapolating a straight line of (αhν)2vs. hν curves. Band gap value of 3.48 eV, 3.25 eV, 3.2 eV, 3.0 eV, and 2.8 eV were observed for (Cs-Fdx) films with 100:0, 95:5, 90:10, 85:15 and 80:20 respectively.

scholarly journals Effects of the Argon Pressure on the Optical Band Gap of Zinc Oxide Thin Films Grown by Nonreactive RF Sputtering

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
M. Acosta ◽  
I. Riech ◽  
E. Martín-Tovar
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Band Gap ◽  
Room Temperature ◽  
Optical Band Gap ◽  
Rf Sputtering ◽  
Argon Pressure ◽  
Band Gaps ◽  
Zno Thin Films ◽  
Optical Band Gaps

Zinc oxide (ZnO) thin films were grown by nonreactive RF sputtering at room temperature under varying argon pressures (PAr). Their optical band gap was found to increase from 3.58 to 4.34 eV when the argon pressure increases from 2.67 to 10.66 Pa. After annealing at 200°C and 500°C, optical band gaps decrease considerably. The observed widening of the band gap with increasingPArcan be understood as being a consequence of the poorer crystallinity of films grown at higher pressures. Measurements of morphological and electrical properties of these films correlate well with this picture. Our main aim is to understand the effects ofPAron several physical properties of the films, and most importantly on its optical band gap.

Investigation of optical band gap and device parameters of rubrene thin film prepared using spin coating technique

2014 ◽  
Vol 582 ◽  
pp. 696-702 ◽  
Author(s):  
Nihat Tuğluoğlu ◽  
Behzad Barış ◽  
Hatice Gürel ◽  
Serdar Karadeniz ◽  
Ömer Faruk Yüksel
Keyword(s):  
Thin Film ◽  
Band Gap ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Spin Coating Technique ◽  
Coating Technique

Optical Properties of CuZn0.8Cd0.2SnS4 Quinternary Alloy Nanostructures

2015 ◽  
Author(s):  
A. S. Ibraheam ◽  
Y. Al-Douri ◽  
U. Hashim ◽  
Waleed K. Ahmed
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Spin Coating ◽  
Band Gap Energy ◽  
Direct Band Gap ◽  
Gap Energy ◽  
Coating Technique ◽  
Cu Content ◽  
Direct Band ◽  
Alloy Nanostructures

Cu2Zn0.8Cd0.2SnS4 quinternary alloy nanostructures were prepared with different copper (Cu) concentrations; 0.3, 0.5, 0.7 and 0.9 mol/L using the spin coating technique. The direct band gap energy of Cu2Zn0.8Cd0.2SnS4 quinternary alloy nanostructures is investigated to decrease as Cu increases. The transmittance value in the range 63–49% is depending on Cu content.

Morphological and Optical Properties of Different Mg Percentage of ZnO/Mg Thin Films Prepared by Sol-Gel Spin-Coating and Immersion Method

2015 ◽  
Vol 1107 ◽  
pp. 637-642 ◽  
Author(s):  
Aadila Aziz ◽  
R. Mohamed ◽  
A.N. Afaah ◽  
N.A.M. Asib ◽  
M. Rusop ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Immersion Method ◽  
Weight Percentage ◽  
Tauc Plot ◽  
Vis Spectroscopy

We have successfully demonstrated ZnO/Mg thin films on Mg seeded-template by using sol-gel spin-coating and immersion technique. By increasing weight percentage of Mg, zinc particles become agglomerate and displayed flower formed as displayed in FESEM characterization. It was observed that the morphology of the zinc particles on Mg seeded-template change from inconsistently distribution for 1 and 3 % into cluster flower-like of zinc particles for 5 and 7 % weight percentage of Mg. The optical properties of the ZnO/Mg thin films were examined by UV-Vis spectroscopy and the Tauc plot methods was used to estimate the optical band gap. The study reveals that, 7 % weight percentage of Mg was recorded as the highest transmittance which is more than 60 % in visible wavelength compared to others. With the rise weight percentage of Mg, the transmittance of the thin films was increased except for 5 %. This gradually downgraded to below 60 % of transmission most probably due to the grain size that becomes bigger. The optical band gap can be tuned by using different Mg percentage to the ZnO/Mg thin films.

Structural and Optical Properties of Nanohybrid PMMA/TiO2

2013 ◽  
Vol 667 ◽  
pp. 63-67 ◽  
Author(s):  
N.A.A. Aziz ◽  
M.F. Achoi ◽  
Saifollah Abdullah ◽  
Mohamad Rusop Mahmood
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Molar Concentration ◽  
Structural And Optical Properties ◽  
Tio2 Particles ◽  
Coating Method ◽  
Uv Range

Preparation of nanohybrid PMMA/TiO2 hybrid was reported by using mixture sol-gel spin coating method. This studied involve modification band gap of TiO2 at different molar concentration of TTiB precursor. AFM image show TiO2 particles encapsulated with PMMA matrix. From UV-Vis spectroscope, we have found as increase of TTiB precursor molar concentration, optical band gap is 3.34 eV, increase in UV-range from 3.25 eV. This study suggested for improvement of optical band gap TiO2 coated glass.

Sol-gel growth of Ni doped CdS on glass substrates: effect of spin coating speed and dopant concentration

2020 ◽  
Vol 10 ◽  
Author(s):  
Atefeh Nazari Setayesh ◽  
Hassan Sedghi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Dopant Concentration ◽  
Rotation Speed ◽  
Sol Gel ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Glass Substrates

Background: In this work, CdS thin films were synthesized by sol-gel method (spin coating technique) on glass substrates to investigate the optical behavior of the film. Methods: Different substrate spin coating speeds of 2400, 3000, 3600 rpm and different Ni dopant concentrations of 0 wt.%, 2.5 wt.%, 5 wt.%) were investigated. The optical properties of thin films such as refraction index, extinction coefficient, dielectric constant and optical band gap energy of the layers were discussed using spectroscopic ellipsometry method in the wavelength range of 300 to 900 nm. Results: It can be deduced that substrate rotation speed and dopant concentration has influenced the optical properties of thin films. By decreasing rotation speed of the substrate which results in films with more thicknesses, more optical interferences were appeared in the results. Conclusion: The samples doped with Ni comparing to pure ones have had more optical band gap energy.

Structural, electrical and optical properties of Mg-doped CuAlO2 films by pulsed laser deposition

RSC Advances ◽  
2014 ◽  
Vol 4 (78) ◽  
pp. 41294-41300 ◽  
Author(s):  
Y. S. Zou ◽  
H. P. Wang ◽  
S. L. Zhang ◽  
D. Lou ◽  
Y. H. Dong ◽  
...  
Keyword(s):  
Optical Properties ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Band Gaps ◽  
Laser Deposition ◽  
Electrical And Optical Properties ◽  
Optical Band Gaps ◽  
P Type ◽  
Enhanced Conductivity ◽  
Mg Doped

P-type Mg doped CuAlO2 films with high crystallinity are prepared by pulsed laser deposition followed by annealing, and exhibit enhanced conductivity and tunable optical band gaps.

Electrical and optical properties of reduced graphene oxide thin film deposited onto polyethylene terephthalate by spin coating technique

2017 ◽  
Vol 56 (28) ◽  
pp. 7774 ◽  
Author(s):  
Harry Anderson Rivera Tito ◽  
Anne Habermehl ◽  
Christian Müller ◽  
Sebastian Beck ◽  
Carlos Romero Nieto ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Polyethylene Terephthalate ◽  
Spin Coating ◽  
Oxide Thin Film ◽  
Electrical And Optical Properties ◽  
Coating Technique ◽  
Reduced Graphene

Optical Properties of Alq3/TiO2 BDR Structure Processed by Spin Coating Technique

MRS Advances ◽  
2019 ◽  
Vol 4 (11-12) ◽  
pp. 661-666
Author(s):  
L. Ajith DeSilva ◽  
Sarahn Nazaret ◽  
A. G. U. Perera ◽  
T. M. W. J. Bandara
Keyword(s):  
Thin Films ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Band Gap ◽  
Spin Coating ◽  
Light Emission ◽  
Wide Band ◽  
Bragg Reflector ◽  
Distributed Bragg Reflector ◽  
Pl Quenching

ABSTRACTOne-dimensional hybrid Distributed Bragg Reflector (DBR) is constructed using Tris (8-hydroxy) quinoline aluminum (Alq3) molecules and Titanium dioxide (TiO2) nanoparticles via spin coating process. Light emission from thin films of low molecular weight organic semiconductor of Alq3 is dominated by excitons. This material has been widely used as a superior emitter for organic light emitting diodes. Titanium dioxide (TiO2) is an inorganic semiconductor with a high band gap. Photoluminescence (PL) of thin films of Alq3 showed a broad PL peak at 530 nm. In DBR structures, PL quenching is observed but there is no shift in the PL peak of the Alq3. The PL quenching is tentatively attributed to energy transfer via sensitization to wide band gap TiO2 layers. A simple excitonic model is suggested to explain the observation. Fabrication process and optical properties of the structure are presented.

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