scholarly journals Synthesis and Characterization of Polymeric (PMMA-PVA) Hybrid Thin Films Doped with TiO2 Nanoparticles Using Dip-Coating Technique

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 99
Author(s):  
Ahmad Alsaad ◽  
Abdul Raouf Al Dairy ◽  
Ahmad Ahmad ◽  
Issam A. Qattan ◽  
Shatha Al Fawares ◽  
...  
Keyword(s):  
Thin Films ◽  
Titanium Dioxide Nanoparticles ◽  
Dip Coating ◽  
Optical Bandgap ◽  
Bandgap Energy ◽  
Bandgap Engineering ◽  
Tio2 Nps ◽  
Polymeric Thin Films ◽  
Wide Range ◽  
Hybrid Thin Films

We report the synthesis of hybrid thin films based on Poly(MethylMethAcrylate) (PMMA) and Poly(VinylAlcohol) (PVA), doped with different concentrations of titanium dioxide nanoparticles (TiO2 NPs). As-prepared thin films of (PMMA-PVA) doped by TiO2 NPs (wt.% = 2%, 4%, 8%, and 16%) are deposited on glass substrate. Transmittance (T%), reflectance (R%), absorption coefficient (α), optical constants (n and k), and optical dielectric functions (ε1 and ε2) are deduced using the experimental transmittance and reflectance spectra. Furthermore, a combination of classical models such as Tauc, Urbach, Spitzer-Fan, and Drude models are applied to calculate the optical and optoelectronic parameters and the energy gaps of the prepared nanocomposite thin films. The optical bandgap energy of PMMA-PVA thin film is found to be 4.101 eV. Incorporation of TiO2 NPs into PMMA-PVA polymeric thin films leads to a decrease in the optical bandgap and thus bandgap engineering is possible. Fourier-transform infrared spectroscopy (FTIR) transmittance spectra of thin films are measured and interpreted to identify the vibrational modes. To elucidate the chemical stability, thermogravimetric (TGA) curves are measured. We found that (PMMA-PVA)/TiO2 NPs polymeric thin films are thermally stable below 110 °C enable them to be attractive for a wide range of optical and optoelectronic applications.

scholarly journals Characterization of As-Prepared (PMMA-PVA)/CuO-NPs Hybrid Nanocomposite Thin Films

2021 ◽  
Author(s):  
Ahmad Alsaad ◽  
Ahmad Ahmad ◽  
Abdul Raouf Al Dairy ◽  
Issam A. Qattan ◽  
Shatha Al Fawares ◽  
...  
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Optical Bandgap ◽  
Bandgap Energy ◽  
Polymeric Thin Films ◽  
Cuo Nps ◽  
Wide Range ◽  
Nanocomposite Thin Films ◽  
Optical Bandgap Energy

We report the synthesis and characterization of Poly Methyl-Meth-Acrylate (PMMA)/Poly vinylalcohol (PVA) polymeric blend doped with different concentrations of Copper oxide (CuO) nanoparticles (NPs). The (PMMA-PVA)/CuO nanocomposite hybrid thin films (wt. % = 0%, 2%, 4%, 8%, and 16%) of CuO NPs are deposited on glass substrates via dip-coating technique. The transmittance (T%), reflectance (R%), the absorption coefficient (α), the optical constants [refractive index (n), extinction coefficient (k)], optical dielectric functions [ɛ',ɛ''] are investigated and interpreted. Tauc, Urbach, Spitzer-Fan, and Drude models are employed to calculate the optical bandgap energy (Eg) and the optoelectronic parameters of the nanocomposite thin films. The refractive index and optical bandgap energy of of (PMMA-PVA) polymeric thin film are found to be (1.5 to 1.85) and 4.101 eV, respectively. Incorporation of specific concentrations of CuO-NPs in (PMMA-PVA) polymeric thin films leads to a noticeable decrease in the optical bandgap energy and to an increase of the refractive index. Moreover, Fourier Transform Infrared Spectroscopy (FTIR) transmittance spectra are measured and analyzed for undoped and doped polymeric thin films to pinpoint the major vibrational modes in the spectral range (500 and 4000 cm-1), as well as, the nature of network bonding in both systems. Thermal stability of thin films is investigated by performing thermogravimetric analysis (TGA). The TGA thermograms confirm that both doped polymeric thin films are thermally stable at temperatures below 110°C which enables them to be attractive for a wide range of optical and optoelectronic applications. Our results indicate that optical, vibrational and thermal properties of both polymeric thin films can be tuned for specific applications by the appropriate corporation of particular concentrations of CuO-NPs.

scholarly journals Synthesis of Optically Tunable and Thermally Stable PMMA–PVA/CuO NPs Hybrid Nanocomposite Thin Films

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1715
Author(s):  
Ahmad M. Alsaad ◽  
Ahmad A. Ahmad ◽  
Issam A. Qattan ◽  
Abdul-Raouf El-Ali ◽  
Shatha A. Al Fawares ◽  
...  
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Dip Coating ◽  
Bandgap Energy ◽  
Optical Parameters ◽  
Thermally Stable ◽  
Polymeric Thin Films ◽  
Glass Substrates ◽  
Cuo Nps ◽  
Hybrid Thin Films

We report the synthesis and comprehensive characterization of polymethylmethacrylate (PMMA)/polyvinylalcohol (PVA) polymeric blend doped with different concentrations of Copper oxide (CuO) nanoparticles (NPs). The PMMA–PVA/CuO nanocomposite hybrid thin films containing wt.% = 0%, 2%, 4%, 8%, and 16% of CuO NPs are deposited on glass substrates via dip-coating technique. Key optical parameters are measured, analyzed, and interpreted. Tauc, Urbach, Spitzer–Fan, and Drude models are employed to calculate the optical bandgap energy (Eg) and the optoelectronic parameters of PMMA–PVA/CuO nanocomposites. The refractive index and Eg of undoped PMMA–PVA are found to be (1.5–1.85) and 4.101 eV, respectively. Incorporation of specific concentrations of CuO NPs into PMMA–PVA blend leads to a considerable decrease in Eg and to an increase of the refractive index. Moreover, Fourier Transform Infrared Spectroscopy (FTIR) transmittance spectra are measured and analyzed for undoped and doped polymeric thin films to pinpoint the major vibrational modes in the spectral range (500 and 4000 cm−1) as well as to elucidate the nature of chemical network bonding. Thermogravimetric analysis (TGA) is conducted under appropriate conditions to ensure the thermal stability of thin films. Doped polymeric thin films are found to be thermally stable below 105 °C. Therefore, controlled tuning of optoelectronic and thermal properties of doped polymeric thin films by introducing an appropriate concentration of inorganic fillers leads to a smart design of scaled multifunctional devices.

scholarly journals Effect of various additives on aluminum oxide thin films prepared by dip coating, thermal behavior, kinetics and optical properties

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Mohammed Bouzbib ◽  
Maryam El Marouani ◽  
Katalin Sinkó
Keyword(s):  
Thin Films ◽  
Acetic Acid ◽  
Aluminum Oxide ◽  
Degradation Kinetics ◽  
Grazing Incidence ◽  
Dip Coating ◽  
Bandgap Energy ◽  
Oxide Thin Films ◽  
Wide Range ◽  
Optical Applications

AbstractAluminum oxide thin films attract research interest due to their properties. Aluminum acetate was used as an Al source with acetic acid, oxalic acid, and nitric acid as additives. The transmittance and the thickness of the films strongly depend on the additives, with the approximate bandgap energy changing from 5 ev to 5.4 ev. The aluminum oxide film deposited by dip-coating is presented great uniform surface morphology. The knowledge of the degradation kinetics of materials is essential for investigating the thermal stability of compounds. The acetic acid thin film proved to be the most efficient additive by demonstrating interesting optoelectronic properties. The thin films deposited by dip-coating were characterized by using X-ray grazing incidence diffraction, SEM, UV-Visible spectroscopy. Gamma aluminum oxide thin films prepared by acetic acid can be a good candidate for a wide range of optical applications.

Thickness Dependent Structural and Optical Properties of Cadmium Selenide Thin Films

2013 ◽  
Vol 665 ◽  
pp. 159-167
Author(s):  
M.S. Jani ◽  
H.S. Patel ◽  
J.R. Rathod ◽  
K.D. Patel ◽  
V.M. Pathak ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Hexagonal Wurtzite Structure ◽  
Optical Bandgap ◽  
Bandgap Energy ◽  
Structural And Optical Properties ◽  
Structural Investigations ◽  
Glass Substrates ◽  
Optical Bandgap Energy ◽  
Different Thickness

In this paper structural and optical properties of CdSe thin films with different thickness deposited by thermal evaporation under vacuum onto glass substrates are presented. The structural investigations performed by means of XRD technique showed that the films have a polycrystalline and hexagonal (würtzite) structure. The values of some important parameters of the studied films (absorption coefficient and optical bandgap energy) are determined from transmission spectra. The values of the optical bandgap energy (Eg) calculated from the absorption spectra, ranged between 1.67 - 1.74 eV.

Effects the Surface of Solar-light Photocatalytic Activity of Ag-doped TiO2 Nanohybrid Material prepared with a Novel Approach

2021 ◽  
Author(s):  
G. Nagaraj ◽  
Mustafa K. A. Mohammed ◽  
Haider G. Abdulzahraa ◽  
S. Tamilarasu
Keyword(s):  
Visible Light ◽  
Degradation Rate ◽  
Titanium Dioxide Nanoparticles ◽  
Resonance Phenomenon ◽  
Bandgap Energy ◽  
Effective Strategy ◽  
Tio2 Nps ◽  
Photodegradation Efficiency ◽  
Novel Approach ◽  
Nanohybrid Material

Abstract Surface modification with a nanomaterial has been confirmed to be an effective strategy to enhance the visible-light photodegradation efficiency of titanium dioxide nanoparticles (TiO2-NPs). In this regard, we used silver as an additive into TiO2-NPs to improve their photodegradation activity under visible light irradiation. Herein, a novel and eco-friendly process was developed to prepare the Ag-doped TiO2 nanohybrid and named as photon-induced method (PIM). The XRD technique showed that the prepared Ag-doped TiO2 has mixed phases of anatase and rutile. However, the rutile-only phase was detected for the pure TiO2-NPs at 700°C of calcination. Ultraviolet-visible (UV-vis) absorption spectra revealed a reduction in the bandgap energy of TiO2 after Ag doping. Besides, the addition of Ag resulted in a significant improvement of TiO2 morphology. Methlyene blue (MB) dye was chosen to be an organic target to investigate the photocatalyst activity of the TiO2-NPs. In this regard, the degradation rate of MB was found to be 100% for the Ag-doped TiO2, which is higher than that of pure rutile TiO2. The incorporation of Ag additive plays a significant role in the improvement of TiO2 stability and photodegradation performance due to the surface plasmon resonance phenomenon.

Doping and Annealing Effects on the Optical Bandgap of the Nickel Doped Copper Oxide Thin Films

2021 ◽  
Vol 16 (2) ◽  
pp. 243-248
Author(s):  
Fatmah S. Bahabri ◽  
Alaa Y. Mahmoud ◽  
Wafa A. Alghameeti
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Doping Concentration ◽  
Cupric Oxide ◽  
Optical Bandgap ◽  
Visible Range ◽  
Bandgap Energy ◽  
Direct Bandgap ◽  
Annealing Temperatures ◽  
Annealing Effects

In this work, we study the optical properties of the Nickel doped cupric oxide Ni-CuO thin films with Ni various doping concentrations (0, 20, 30, 50, 70, and 80%), at two different annealing temperatures; 200 and 400 °C. The absorbance and optical bandgap for the films are calculated and compared. We find that all films exhibit clear peaks in the visible range, with the increase in the absorptivity via increasing both annealing and Ni concentration. We also find that the annealing affects the shape of the absorbance peaks to be narrowed and blue shifted. Investigation on the direct bandgap energy shows that all films exhibit large direct gap; ranging from 3.87 to 4.01 eV. For non-annealed films, direct bandgap increases with increasing the Ni concentration, while for the annealed samples, the direct bandgap generally decreases by annealing, and with increasing the doping concentration. For the indirect bandgap analysis, the calculated values of the bandgap are ranging from 0.62 to 1.96 eV. We find that for non-annealed films, the indirect bandgap increases with increasing the doping concentration, while after annealing, the bandgap decreases with increasing the doping concentration for the annealing at 200 and 400 °C, with more decreasing in the gap at 400 °C.

scholarly journals Titanium Dioxide Nanoparticles – Prospects and Applications in Medicine

2020 ◽  
Author(s):  
Daniel Ziental ◽  
Beata Czarczynska-Goslinska ◽  
Dariusz T. Mlynarczyk ◽  
Arleta Glowacka-Sobotta ◽  
Beata Stanisz ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Metallic Nanoparticles ◽  
Malignant Tumors ◽  
Uv Light ◽  
Titanium Dioxide Nanoparticles ◽  
Aqueous Media ◽  
Resistant Bacteria ◽  
Antibiotic Resistant ◽  
Tio2 Nps ◽  
Wide Range

Metallic nanoparticles (NPs), among polymeric NPs, liposomes, micelles, quantum dots, dendrimers, or fullerenes, are becoming more and more important due to their potential use in the novel medical therapies. Titanium dioxide (titanium(IV) oxide, titania, TiO2) is an inorganic compound that owes its recent rise in scientific interest to photoactivity. After the illumination in aqueous media with UV light, TiO2 produces an array of reactive oxygen species (ROS). The capability to produce ROS and thus induce cell death has found application in the photodynamic therapy (PDT) for the treatment of a wide range of maladies, from psoriasis to cancer. Titanium dioxide NPs were studied as photosensitizing agents in the treatment of malignant tumors as well as in photodynamic inactivation of antibiotic-resistant bacteria. Both TiO2 NPs themselves, as well as their composites with other molecules, can be successfully used as photosensitizers in PDT. Moreover, various organic compounds can be grafted on TiO2 NPs, leading to hybrid materials. These nanostructures can reveal increased light absorption allowing their further use in targeted therapy in medicine. In order to improve efficient anticancer therapy, many approaches utilizing titanium dioxide were tested. The most significant studies are discussed in this review.

CADMIUM-DOPED Co3O4 THIN FILMS: SYNTHESIS AND CHARACTERIZATION

2019 ◽  
Vol 26 (01) ◽  
pp. 1850134 ◽  
Author(s):  
CHERIFA DALACHE ◽  
HADJ BENHEBAL ◽  
BEDHIAF BENRABAH ◽  
AEK AMMARI ◽  
ABDELMALEK KHARROUBI ◽  
...  
Keyword(s):  
Thin Films ◽  
Impedance Spectroscopy ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Thin Layers ◽  
Bandgap Energy ◽  
Molar Ratios ◽  
Glass Substrates ◽  
Vis Spectroscopy

This paper contains the results of the structural and spectroscopic characterizations of undoped and Cadmium-doped cobalt oxide thin films with different Co/Cd molar ratios (3%, 5%, 7% and 9%). The nanosized undoped and cadmium-doped Co3O4 thin layers were prepared using sol–gel process and deposited on glass substrates by dip coating. The changes caused by the incorporation of cadmium at different levels of doping have been highlighted by the techniques UV–Visible (UV–Vis) spectroscopy, Infrared (IR) spectroscopy, X-ray diffraction (XRD) measurements, SEM coupled EDX and impedance spectroscopy. From the UV–Vis spectroscopy analysis, it was found that all the films are two direct bandgap energies. The optical transmittance and the bandgap energy decrease with increase in Cd concentration. The XRD spectra confirm the films were polycrystalline with a cubic spinel structure. The results of the impedance spectroscopy show that the equivalent circuit of the synthesized samples is an RC parallel circuit.

scholarly journals Enhancing the insulation of wide-range spectrum in the PVA/N thin film by doping ZnO nanowires

RSC Advances ◽  
2014 ◽  
Vol 4 (85) ◽  
pp. 45419-45424 ◽  
Author(s):  
Yu-Chen Lin ◽  
Ching-Hsiang Chen ◽  
Liang-Yih Chen ◽  
Shih-Chieh Hsu ◽  
Shizhi Qian
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Zno Nanowires ◽  
Wide Range ◽  
Hybrid Thin Films ◽  
Doped Zno

PVA/N doped ZnO hybrid thin films provide protection against harmful UV and IR rays.

scholarly journals Nanostructured CeO2 Thin Films Prepared by the Sol-Gel Dip-Coating Method with Anomalous Behavior of Crystallite Size and Bandgap

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Y. J. Acosta-Silva ◽  
M. Toledano-Ayala ◽  
G. Torres-Delgado ◽  
I. Torres-Pacheco ◽  
A. Méndez-López ◽  
...  
Keyword(s):  
Thin Films ◽  
Crystallite Size ◽  
Sol Gel ◽  
Precursor Solution ◽  
Dip Coating ◽  
Anomalous Behavior ◽  
Bandgap Energy ◽  
Coating Method ◽  
Cubic Structure ◽  
Dip Coating Method

Amorphous CeO2 thin films were deposited by a dip-coating method on Corning glass substrates and annealed for one hour at the temperatures (T) of 250, 450, and 550°C in air for crystallization. The precursor solution was prepared by dissolving cerium acetate in methanol, lactic acid, glycerol, and trimethylamine at 55°C. X-ray diffraction (XRD) patterns showed the cubic structure of CeO2. From XRD data and employing the Scherrer formula, the crystallite size (CS) was calculated to be within the 4.0±0.5 to 10±1 nm interval. SEM micrographs revealed cracks of the films annealed at 250 and 450°C, even though for 550°C, the film shows a homogeneous morphology free of cracks. CS increases (from 4.0 to 10 nm) and thickness decreases (from 217 to 182 nm) when T increases. The UV-vis spectra exhibited an average transmittance of 80% in the 300 to 2000 nm wavelength range. Also, from XRD, it was observed that the lattice shrinks and from transmittance that the bandgap energy increases with T. The Raman spectra exhibit 461 cm-1 assigned to F2g mode of the fluorite cubic structure, where F2g hardens when T increases as an effect of the shrinkage of the lattice.

Sign in / Sign up

Export Citation Format

Share Document