scholarly journals Influence of the nature of a polysaccharide on the surface-morphological and physicomechanical properties of sol–gel plates

2021 ◽  
Vol 2086 (1) ◽  
pp. 012115
Author(s):  
O N Malinkina ◽  
A B Shipovskaya
Keyword(s):  
Thin Film ◽  
Regenerative Medicine ◽  
Surface Morphology ◽  
Therapeutic Effect ◽  
Surface Relief ◽  
Solid Phase ◽  
Sol Gel ◽  
Aloe Vera ◽  
Physicomechanical Properties ◽  
Wide Range

Abstract Thin-film sol–gel plates based on chitosan and glucomannan polysaccharides in a wide range of compositions were obtained. The effect of the polysaccharide component on the SEM surface morphology and physicomechanical properties was evaluated. It was found that the introduction of the polysaccharide glucomannan (and/or Aloe Vera juice) into the composition of chitosan sol–gel plates increased the elastoplastic characteristics of the samples and had a significant effect on the surface relief of their solid phase. The obtained structures can be used for the design of bioadhesive sensor coatings with a high therapeutic effect, which is an urgent area for theranostics and regenerative medicine.

scholarly journals SCAPS modelling of ZnO/CdS/CdTe/CuO photovoltaic heterosystem

2020 ◽  
Vol 21 (4) ◽  
pp. 660-668
Author(s):  
Z. R. Zapukhlyak ◽  
L.I. Nykyruy ◽  
G. Wisz ◽  
V.M. Rubish ◽  
V.V. Prokopiv ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Surface Morphology ◽  
Low Cost ◽  
Modern Literature ◽  
Vacuum Deposition ◽  
Critical Dimensions ◽  
Technological Improvement ◽  
Wide Range

The authors have developed a simple, cheap and reproducible technology for obtaining thin-film heterostructures based on CdTe with a given surface morphology during vacuum deposition, which contributes to their low cost [1, 2]. The critical dimensions (thicknesses) of individual layers of the heterostructure were substantiated, a simulation was performed and a wide range of optical properties was investigated [3]. It is shown that for the deposited CdS / CdTe heterostructure on glass it is possible to obtain an efficiency of 15.8%. Given that thin films are relatively new systems, their study can offer much wider opportunities for technological improvement of photovoltaic energy converters. According to the analysis of modern literature data, the efficiency can be increased by performing deposition on ITO films and introducing nanoparticles of controlled sizes.

THE SURFACE MORPHOLOGY OF Ba0.65Sr0.35TiO3 THIN FILM BY SOL-GEL METHOD

2005 ◽  
Vol 72 (1) ◽  
pp. 1-11 ◽  
Author(s):  
WENCHENG HU ◽  
CHUANREN YANG ◽  
WANLI ZHANG ◽  
YAN QIU ◽  
LIN ZHU
Keyword(s):  
Thin Film ◽  
Surface Morphology ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Improvements of Electrical Characteristics in Poly-Si Nanowires Thin-Film Transistors with External Connection of a BiFeO3 Capacitor

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 758
Author(s):  
Tsung-Kuei Kang ◽  
Yu-Yu Lin ◽  
Han-Wen Liu ◽  
Che-Li Lin ◽  
Po-Jui Chang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Thin Film Transistor ◽  
Sol Gel ◽  
Potential Candidate ◽  
Electrical Characteristics ◽  
Si Nanowires ◽  
Major Mechanism ◽  
Wide Range ◽  
External Connection

By a sol–gel method, a BiFeO3 (BFO) capacitor is fabricated and connected with the control thin film transistor (TFT). Compared with a control thin-film transistor, the proposed BFO TFT achieves 56% drive current enhancement and 7–28% subthreshold swing (SS) reduction. Moreover, the effect of the proposed BiFeO3 capacitor on IDS-VGS hysteresis in the BFO TFT is 0.1–0.2 V. Because dVint/dVGS > 1 is obtained at a wide range of VGS, it reveals that the incomplete dipole flipping is a major mechanism to obtain improved SS and a small hysteresis effect in the BFO TFT. Experimental results indicate that sol-gel BFO TFT is a potential candidate for digital application.

scholarly journals Polymorphs of Neodymium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

2019 ◽  
Vol 19 (1) ◽  
pp. 34-43
Author(s):  
H. Bruncková ◽  
Ľ. Medvecký ◽  
E. Múdra ◽  
A. Kovalčiková
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Surface Morphology ◽  
Spin Coating ◽  
Sol Gel ◽  
Coating Process ◽  
Spin Coating Process ◽  
Gel Method ◽  
Afm Analysis ◽  
Thin Film Devices

AbstractNeodymium niobate NdNbO4 (NNO) and tantalate NdTaO4 (NTO) thin films (~100 nm) were prepared by sol-gel/spin-coating process on Pb(Zr0.52Ti0.48)O3/Al2O3 substrates with annealing at 1000°C. The precursors of films were synthesized using Nb or Ta tartrate complexes. The XRD results of NNO and NTO films confirmed tetragonal T-NdNbO4 and T-NdTaO4 phases, respectively, with traces of monoclinic MNdNbO4 and M´-NdTaO4. The surface morphology and topography were investigated by SEM and AFM analysis. NTO was smoother with roughness 5.24 nm in comparison with NNO (6.95 nm). In the microstructure of NNO, small spherical (~ 20-50 nm) T-NdNbO4 and larger needle-like particles (~100 nm) of M-NdNbO4 phase were observed. The compact clusters composed of fine spherical T-NdTaO4 particles (~ 50 nm) and cuboidal M´-NdTaO4 particles (~ 100 nm) were found in NTO. The results of this work can contribute to formation of different polymorphs of films for the application in environmental electrolytic thin film devices.

scholarly journals Phase Composition of Samarium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

2017 ◽  
Vol 17 (1) ◽  
pp. 10-20
Author(s):  
H. Bruncková ◽  
Ľ. Medvecký ◽  
E. Múdra ◽  
A. Kovalčiková ◽  
J. Ďurišin ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Composition ◽  
Surface Morphology ◽  
Spin Coating ◽  
Sol Gel ◽  
Coating Process ◽  
Spin Coating Process ◽  
Afm Analysis ◽  
Thin Film Devices

Abstract Samarium niobate SmNbO4 (SNO) and tantalate SmTaO4 (STO) thin films (~100 nm) were prepared by sol-gel/spin-coating process on alumina substrates with PZT interlayer and annealing at 1000°C. The precursors of films were synthesized using Nb or Ta tartrate complexes. The improvement of the crystallinity of monoclinic M′-SmTaO4 phase via heating was observed through the coexistence of small amounts of tetragonal T-SmTa7O19 phase in STO precursor at 1000°C. The XRD results of SNO and STO films confirmed monoclinic M-SmNbO4 and M′-SmTaO4 phases, respectively, with traces of orthorhombic O-SmNbO4 (in SNO). In STO film, the single monoclinic M′-SmTaO4 phase was revealed. The surface morphology and topography of thin films were investigated by SEM and AFM analysis. STO film was smoother with roughness 3.2 nm in comparison with SNO (6.3 nm). In the microstructure of SNO film, small spherical (~50 nm) and larger cuboidal particles (~100 nm) of the SmNbO4 phase were observed. In STO, compact clusters composed of fine spherical SmTaO4 particles (~20-50 nm) were found. Effect of samarium can contribute to the formation different polymorphs of these films for the application to environmental electrolytic thin film devices.

Studies of Photocatalytic Degradation of Trace-Level MC-LR in Water on Thin Film of Titanium Dioxide

2007 ◽  
Vol 121-123 ◽  
pp. 951-954
Author(s):  
X.G. Feng ◽  
F. Rong ◽  
Tao Wei ◽  
Chun Wei Yuan
Keyword(s):  
Thin Film ◽  
Photocatalytic Degradation ◽  
Tio2 Thin Film ◽  
Solid Phase ◽  
Sol Gel ◽  
Kinetic Equations ◽  
Dip Coating ◽  
Hplc Method ◽  
Trace Level ◽  
Coating Method

MCs are produced by cyanobacteria and cause concerns in potable water due to toxicity. Conventional treatments are poor at removing MCs. In the present study, the photocatalytic degradation of MC-LR was conducted using nano-TiO2 thin film, prepared by sol-gel and dip-coating method, with UV 365nm irradiation. According to analysis results from solid-phase extraction combined with HPLC method, the trace-level MC-LR is easily to be removed by photocatalytic system. The degradation efficiency of MC-LR is influenced by the pH conditions, initial concentration due to adsorption of MC-LR on TiO2 thin film. The maximum initial rate of photocatalytic degradation occurs at pH 4 and over 95% of 20μg/L MC-LR is decomposed within 120min. The kinetic equations and parameters revealed that degradation reaction of trace level MC-LR, which depicted by pseudo first order kinetics process in appearance, was in accordance with Langmuir-Hinshelwood kinetics model well, the corresponding rate constant k and Langmuir adsorption constant K were determined to be 19.72μg/l·min-1 and 6.57×10-4l/μg, respectively.

Structural and Optical Characterization of TiO2/ZnO Thin Films Prepared by Sol-Gel Method

2017 ◽  
Vol 888 ◽  
pp. 290-296
Author(s):  
Nur Syahraain Zulkiflee ◽  
Rosniza Hussin ◽  
Hasrul Yahya
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Surface Morphology ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Zno Thin Films ◽  
Gel Method ◽  
Sol Gel Method

Thin film has been extensively study due to better structural, surface morphology, and optical properties. The combination of two materials will enhance the properties of thin film. In this study, TiO2/ZnO thin films were deposited on glass substrates via sol-gel method. TiO2 acts as pre-deposited thin film with calcination temperatures at 400 °C, 500 °C, and 600 °C. The post-deposition of TiO2/ZnO thin films were calcined at 500 °C and 600 °C. TiO2 sol-gel was synthesis from titanium (IV) butoxide and butanol as the precursor, while ZnO sol-gel was synthesis from zinc acetate dehydrate and isopropanol as the precursor. The TiO2/ZnO thin films were characterized by X-ray diffraction (XRD), atomic force microscope (AFM), and ultraviolet visible spectroscopy (UV-Vis). The effect of calcination temperature and pre-deposited TiO2 thin films show difference results of bilayer thin films. The XRD analysis shows all TiO2/ZnO thin films growth with TiO2 anatase crystalline phase at orientation (1 0 1) and ZnO zincite phase at orientation (1 0 1). The structural properties of TiO2/ZnO thin films were improved by controlling the calcination temperature. Based on AFM analysis, the RMS value for TiO2/ZnO decreases as the calcination temperature increased. The compacted and dense surface roughness were controlled by the temperature. Meanwhile, the percentage of thin film ultraviolet transmittance can be enhanced with combination of two materials, TiO2 and ZnO. Therefore, the pre-deposited layer of thin film with influenced by calcination temperature will improve the crystallinity, surface morphology, and optical properties of TiO2/ZnO thin films.

scholarly journals Development, Optimization and Applications of Thin Film Solid Phase Microextraction (TF-SPME) Devices for Thermal Desorption: A Comprehensive Review

Separations ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 39 ◽  
Author(s):  
Ronald V. Emmons ◽  
Ramin Tajali ◽  
Emanuela Gionfriddo
Keyword(s):  
Thin Film ◽  
Thermal Desorption ◽  
Solid Phase Microextraction ◽  
Method Development ◽  
Solid Phase ◽  
Volume Ratio ◽  
Sampling Device ◽  
Wide Range ◽  
Ultra Trace

Through the development of solid phase microextraction (SPME) technologies, thin film solid phase microextraction (TF-SPME) has been repeatedly validated as a novel sampling device well suited for various applications. These applications, encompassing a wide range of sampling methods such as onsite, in vivo and routine analysis, benefit greatly from the convenience and sensitivity TF-SPME offers. TF-SPME, having both an increased extraction phase volume and surface area to volume ratio compared to conventional microextraction techniques, allows high extraction rates and enhanced capacity, making it a convenient and ideal sampling tool for ultra-trace level analysis. This review provides a comprehensive discussion on the development of TF-SPME and the applications it has provided thus far. Emphasis is given on its application to thermal desorption, with method development and optimization for this desorption method discussed in detail. Moreover, a detailed outlook on the current progress of TF-SPME development and its future is also discussed with emphasis on its applications to environmental, food and fragrance analysis.

scholarly journals Systematic Evaluation of Different Coating Chemistries Used in Thin-Film Microextraction

Molecules ◽  
2020 ◽  
Vol 25 (15) ◽  
pp. 3448
Author(s):  
Jia-Wei Liu ◽  
Khaled Murtada ◽  
Nathaly Reyes-Garcés ◽  
Janusz Pawliszyn
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Hydrophobic Interactions ◽  
Solid Phase ◽  
Polar Compounds ◽  
Systematic Evaluation ◽  
Log P ◽  
Wide Range ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Based

A systematic evaluation of eight different coatings made of solid phase extraction (SPE) and carbon-based sorbents immobilized with polyacrylonitrile in the thin-film microextraction (TFME) format using LC-MS/MS was described. The investigated coatings included graphene, graphene oxide, multi-walled carbon nanotubes (MWCNTs), carboxylated MWCNTs, as carbon-based coatings, and polystyrene-divinylbenzene (PS-DVB), octadecyl-silica particles (C18), hydrophilic–hydrophobic balance particles (HLB) and phenyl-boronic acid modified particles (PBA), as SPE-based coatings. A total of 24 compounds of diverse moieties and of a wide range of polarities (log P from −2.99 to 6.98) were selected as probes. The investigated coatings were characterized based on their extraction performance toward the selected probes at different pH values and at optimized desorption conditions. In the case of SPE-based coatings, PS-DVB and HLB exhibited a balanced extraction for compounds within a wide range of polarities, and C18 showed superior extraction recoveries for non-polar analytes. Carbon-based coatings showed high affinity for non-polar compounds given that their main driving force for extraction is hydrophobic interactions. Interestingly, among the studied carbon-based coatings, graphene oxide showed the best extraction capabilities toward polar compounds owing to its oxygen-containing groups. Overall, this work provided important insights about the extraction mechanisms and properties of the investigated coatings, facilitating the coating selection when developing new TFME applications.

Influence of Catalyst in Synthesizing Brookite Thin Film Coating

2017 ◽  
Vol 264 ◽  
pp. 5-8
Author(s):  
Nur Dalilah Johari ◽  
Zulkifli Mohd Rosli ◽  
Jariah Mohamad Juoi ◽  
Muharniza Azinita Musa
Keyword(s):  
Thin Film ◽  
Grain Size ◽  
Surface Morphology ◽  
Sol Gel ◽  
Acid Catalyst ◽  
Film Coating ◽  
Base Catalyst ◽  
Thin Film Coating ◽  
Catalyst Type ◽  
Different Temperatures

Brookite is the least known titanium dioxide (TiO2) crystallographic phases compare to anatase and rutile. In a sol-gel process, very few works are devoted on synthesizing pure brookite as a thin film coating and usually brookite co-exist with anatase and rutile as a byproduct. This study is performed as an attempt to produce brookite thin film coating via sol-gel dipping method. In this study, the influence of catalyst type on TiO2 phases, morphology and grain size were investigated. Hydrochloric acid (HCl) is used for an acid catalyst and sodium hydroxide (NaOH) is used as base catalyst. All of the TiO2 films were deposited on a glass substrate and heated at four different temperatures of 400°C, 450°C, 500°C and 550°C for 3 hours. X-ray diffraction (XRD) is employed to analyze the phases and the grain size acquired. Images on the surface morphology are obtained with Scanning Electron Microscope (SEM). Results showed that brookite phase exist only for base catalyst with a grain size of 27.40 nm for all of the selected temperatures except at 550°C. SEM results revealed that the surface morphology of the deposited TiO2 film with base catalyst comprised of agglomerated particle networks. In contrast, the surface morphology of the deposited TiO2 film with acid catalyst seems more compact and uniform with an XRD pattern of amorphous-like characteristic having grain size of less than 3 nm.

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