Effect of Silver Content on the Crystalline Phase and Microstructure of TiO2 Coating Deposited on Unglazed Ceramics Tile

2020 ◽  
Vol 17 (3) ◽  
pp. 8179-8185
Author(s):  
N.Z. Hafizah ◽  
J. M. Juoi ◽  
M.R. Zulkifli ◽  
M.A. Musa
Keyword(s):  
Particle Growth ◽  
Dip Coating ◽  
Tio2 Coating ◽  
High Concentration ◽  
Ceramic Tiles ◽  
Soaking Time ◽  
Heat Treated ◽  
Ag Particles ◽  
Tio2 Sol ◽  
Almost All

The synthesis of Ag-TiO2 coating using AgNO3 precursor is expected to give the properties as pure as Ag nanoparticles. Commonly, high concentration of Ag attributed to agglomeration of silver species and reduction to Ag0 particles on TiO2 surface. In contrast, at lower concentration, Ag species exist as AgO, Ag2O and Ag0. Hence, the exact amount of Ag, which can effectively control the particle growth and agglomeration, surface area, thermal stability and band gap of the TiO2 coating, are still vague and stated differently. In the present study, the effect of Ag content on the phase transformation and surface morphology of Ag-TiO2 coating were reported. TiO2 sol were prepared by incorporating Ag at 2.5, 5 and 7.5 mol % and deposited on unglazed ceramic tiles thru five times dip coating. The deposited Ag-TiO2 coatings were heat treated at 500 °C for 1 hour soaking time. XRD analyses revealed that the deposited Ag-TiO2 coating consists of anatase, rutile, Ag2O and metallic Ag. Almost all the coating surfaces illustrated cracks. Increased Ag content lead to presence of tiny particles on the surfaces and EDX spectrum revealed the presence of Ti, O and metallic Ag particles. However, at the addition of 5 mol % Ag, there was no metallic Ag presence and a dense coating with the lowest thickness of ±11.4µm is observed.

Characterization of TiO2 Coating Deposited on Ceramic Substrate

2017 ◽  
Vol 264 ◽  
pp. 38-41
Author(s):  
Muharniza Azinita Musa ◽  
Jariah Mohamad Juoi ◽  
Zulkifli Mohd Rosli ◽  
Nur Dalilah Johari
Keyword(s):  
High Surface ◽  
Sol Gel ◽  
Antimicrobial Properties ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Ceramic Tiles ◽  
Ceramic Substrates ◽  
Heat Treated ◽  
Glancing Angle

The deposition of titanium dioxide, TiO2, films on ceramic tiles was studied in order to take benefit of its antimicrobial properties for suitable application in related fields. In this paper, the characteristics of TiO2 coating deposited on unglazed ceramic substrates with high surface roughness were investigated. TiO2 films were deposited several times via dip coating sol-gel technique and heat treated at 500oC for 1 hour. The coating morphologies and thickness were analyzed using Scanning electron microscope (SEM), while the crystalline phases were characterized using Glancing angle X-ray Diffraction (GAXRD). Results show that it produces coating with homogeneous morphology, thicker film and with the presence of anatase and rutile phases. It was also observed that one dipping time is sufficient to produce a continuous coating with thickness of ~ 12 μm on average.

Effects of heat treatment on Ag particle growth and optical properties in Ag/SiO2 glass composite thin films

1995 ◽  
Vol 10 (2) ◽  
pp. 362-365 ◽  
Author(s):  
I. Tanahashi ◽  
M. Yoshida ◽  
Y. Manabe ◽  
T. Tohda
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Treatment Time ◽  
Particle Growth ◽  
Cube Root ◽  
Heat Treated ◽  
Ag Particles ◽  
The Mean ◽  
Ag Particle ◽  
Deposited Film

Small Ag particles were embedded in SiO2 glass thin films by a multi-target sputtering method. The mean diameter of Ag particles in the as-deposited film with 28.0 at. % of Ag was estimated to be 4.4 nm and it was increased to 24.0 nm when the film was heat-treated at 700 °C for 3 h. The diameter was proportional to the cube root of the heat-treatment time, suggesting that the Ag particles grew in the supersaturated solid solution. In the optical absorption spectra of the heat-treated films, the absorption peak due to the surface plasmon resonance of Ag particles was observed about 410 nm. The peak intensity became large and the full width at half maximum of the absorption band was decreased with increasing the diameter of Ag particles.

Effect of Degussa P25 on the Morphology, Thickness and Crystallinity of Sol-Gel TiO2 Coating

2017 ◽  
Vol 268 ◽  
pp. 224-228 ◽  
Author(s):  
Muharniza Azinita Musa ◽  
Jariah Mohamad Juoi ◽  
Zulkifli Mohd Rosli ◽  
Nur Dalilah Johari
Keyword(s):  
Sol Gel ◽  
Antimicrobial Properties ◽  
Dip Coating ◽  
Ceramic Tiles ◽  
Glass Slides ◽  
Heat Treated ◽  
Coating Morphology ◽  
Sol Gel Process ◽  
Degussa P25 ◽  
Dip Coating Technique

The deposition of titanium dioxide, TiO2, films on various substrates was studied in order to take benefit of its antimicrobial properties for suitable application in related fields. In this paper, the effect of Degussa P25 (a commercial TiO2 nanoparticles additive in the sol) on the morphology, thickness and crystallinity of the deposited TiO2 was investigated. TiO2 films, without and with Degussa P25, were deposited on glass slides and unglazed ceramic tiles via sol-gel process. Films were deposited ten times using dip coating technique and heat treated at 500°C for 1 hour. The coating morphologies and thickness were analyzed using Scanning electron microscope (SEM), while the crystalline phases were characterized using Glancing angle X-ray Diffraction (GAXRD). Results show that the addition of Degussa P25 produces coating with homogeneous morphology and less cracks, thicker film and promotes the presence of anatase and rutile phases. It was also observed that the deposition of TiO2 with Degussa P25 on unglazed ceramic tile produced thicker film (~120mm) as compared to the film deposited on glass slide (~7mm). Thus, it can be concluded that the addition of Degussa P25 affect the morphology, thickness and crystallinity of the TiO2 coatings, whereas the type of substrate only affects the coating morphology and thickness, but not the crystallization of the TiO2 coating.

scholarly journals Heterogeneous Photo-Fenton Catalytic Degradation of Practical Pharmaceutical Wastewater by Modified Attapulgite Supported Multi-Metal Oxides

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 156
Author(s):  
Manjing Lu ◽  
Jiaqi Wang ◽  
Yuzhong Wang ◽  
Zhengguang He
Keyword(s):  
Photocatalytic Oxidation ◽  
Removal Rate ◽  
Catalytic Degradation ◽  
Gas Chromatography Mass Spectrometry ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Modified Attapulgite ◽  
Cod Removal Rate ◽  
Pre Treatment ◽  
Almost All

Chemical synthetic pharmaceutical wastewater has characteristics of high concentration, high toxicity and poor biodegradability, so it is difficult to directly biodegrade. We used acid modified attapulgite (ATP) supported Fe-Mn-Cu polymetallic oxide as catalyst for multi-phase Fenton-like ultraviolet photocatalytic oxidation (photo-Fenton) treatment with actual chemical synthetic pharmaceutical wastewater as the treatment object. The results showed that at the initial pH of 2.0, light distance of 20 cm, and catalyst dosage and hydrogen peroxide concentration of 10.0 g/L and 0.5 mol/L respectively, the COD removal rate of wastewater reached 65% and BOD5/COD increased to 0.387 when the reaction lasted for 180 min. The results of gas chromatography-mass spectrometry (GC-MS) indicated that Fenton-like reaction with Fe-Mn-Cu@ATP had good catalytic potential and significant synergistic effect, and could remove almost all heterocycle compounds well. 3D-EEM (3D electron microscope) fluorescence spectra showed that the fluorescence intensity decreased significantly during catalytic degradation, and the UV humus-like and fulvic acid were effectively removed. The degradation efficiency of the nanocomposite only decreased by 5.8% after repeated use for 6 cycles. It seems appropriate to use this process as a pre-treatment for actual pharmaceutical wastewater to facilitate further biological treatment.

Synthesis of WO3 Electrochromic Sensor by Sol-Gel Method and Characterization of Its Electrochemical and Optical Properties

2006 ◽  
Vol 317-318 ◽  
pp. 807-810 ◽  
Author(s):  
Chang Yeoul Kim ◽  
Jin Wook Choi ◽  
Tae Yeoung Lim ◽  
Duck Kyun Choi
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Dip Coating ◽  
Xrd Pattern ◽  
Starting Solution ◽  
Oxide Crystal ◽  
Heat Treated ◽  
Coating Method ◽  
Dip Coating Method

Electrochromic WO3 thin film was prepared by using tungsten metal solution in hydrogen peroxide as a starting solution and by sol-gel dip coating method. XRD pattern showed that tungsten oxide crystal phase formed at 400. In the view of electrochemical property, WO3 thin film which was heat-treated at 300 and was amorphous had better than that of the crystalline phase.

Decomposition of Dioxins in Gas and Water Using Photocatalytic Silica-Gel

2005 ◽  
Vol 486-487 ◽  
pp. 41-44 ◽  
Author(s):  
Hiroshi Taoda
Keyword(s):  
Surface Area ◽  
Silica Gel ◽  
Catalyst Layer ◽  
Dip Coating ◽  
Organic Substances ◽  
Titanium Tetraisopropoxide ◽  
Oxidative Potential ◽  
Uv Lamp ◽  
Waste Incinerators ◽  
Almost All

Dioxins are extremely toxic, and it is difficult to treat them with the conventional method. When irradiated by light, photocatalysts generate strong oxidative potential and decomposes almost all organic substances containing dioxins to water, carbon dioxide and others. Silica-gel has high adsorptive activity as well as large surface area, and it is transparent to ultraviolet light. Photocatalytic silica-gel was prepared by a dip coating method using TiO2 sol obtained by hydrolyzing titanium tetraisopropoxide on silica-gel bead (about 3mm in diameter) and heat-treated at 550°C. Since the surface area of the photocatalytic silica-gel is 300m2/g, the reaction area is large and allows the highly efficient decomposition of harmful organic substances, unpleasant odors and colored matters contained in waste water. The photocatalytic apparatus for decomposition of dioxins in emission gas from waste incinerators is composed of the catalyst layer consisting of 95dm3 photocatalytic silica-gel and 16 units of UV lamp. The photocatalytic apparatus was connected to the bypass line led from the outlet duct of cyclone, and the concentration of dioxins in the exhaust gas was measured. Decomposition test of dioxins in scrubber water was also performed using a photocatalytic apparatus with 150g photocatalytic silica-gel and 8 units of UV lamp. After 0.5dm3 of scrubber water containing dioxins was circulated in the photocatalytic apparatus for 1, 2 and 24 hour, each concentration of dioxins in the water was measured. As a result, the removal efficiency over 99% of dioxins in emission gas and scrubber water from waste incinerators has been obtained.

Process Design for Non-Alloyed Contacts to InP-Based Laser Devices

1990 ◽  
Vol 181 ◽  
Author(s):  
A. Katz ◽  
W. C. Dautremont-Smith ◽  
S. N. G. Chu ◽  
S. J. Pearton ◽  
M. Geva ◽  
...  
Keyword(s):  
Process Design ◽  
Ohmic Contacts ◽  
Electron Gun ◽  
Deposition Parameters ◽  
Heat Treated ◽  
Single Side ◽  
Almost All ◽  
P Type ◽  
Laser Devices ◽  
Potential Use

ABSTRACTPl/Ti and W thin films on n- and p- type InP and related materials have been investigated for potential use as a refractory ohmic contacts for conventional, single-side coplanar contacted and self-aligned barrier hetcrostructurc laser devices. Pt and Ti films were deposited sequentially by electron gun evaporation, while the W layer was rf sputtered, both onto p+ -In0.53Ga0.47As (Zn doped 5×l018cm−3) and n−- InP (S doped, 5×l018cm−3). The deposition parameters of the two metal systems were optimized to produce adherent films with the lowest possible induced stress. Almost all the studied systems performed as ohmic contacts already as-deposited and were heat treated by means of rapid thermal processing in the temperature range of 300–900°C. The final contact processing conditions were tuned to provide the lowest possible contact resistance values accompanied by low mechanical stress and stable microstructure.

Dlts-Studies on the “New Oxygen Donor” in Heat Treated and Hydrogenated CZ-Grown SI

1985 ◽  
Vol 59 ◽  
Author(s):  
Karlheinz Hölzlein ◽  
G. Pensl ◽  
M. Schulz ◽  
N. M. Johnson
Keyword(s):  
Low Temperature ◽  
Heat Treatments ◽  
Experimental Results ◽  
Interface Model ◽  
Trap States ◽  
High Concentration ◽  
Oxygen Donor ◽  
Heat Treated ◽  
Processing Steps

ABSTRACTCz-grown Si samples containing a high concentration of oxygen are investigated after various processing steps by DLTS. Heat treatments ranging from 500°C–1000°C are performed to study the formation and annihilation of the “New Oxygen Donor” (ND) traps. Hydrogenation at low temperature leads to a reduction of the ND trap states. The experimental results confirm the “SiOx Interface Model” which assumes two differing types of interfacerelated states.

scholarly journals Sol-derived Hydroxyapatite Ddip-coating of a Porous Ti6Al4V Powder Compact

2016 ◽  
Vol 11 (2) ◽  
pp. 12
Author(s):  
Mustafa Altındiş ◽  
Mustafa Güden ◽  
Chaoying Ni
Keyword(s):  
Pore Size ◽  
Coating Thickness ◽  
Powder Compact ◽  
Coating Layer ◽  
Compact Surface ◽  
Soaking Time ◽  
Porous Ti ◽  
Heat Treated ◽  
Average Porosity

<p>A sintered porous Ti<sub>6</sub>Al<sub>4</sub>V powder compact with a mean pore size of 63 μm and an average porosity of 37±1% was dip-coated at soaking times varying between 1- and 5-minute using a sol-derived calcium Hydrooxyapatite (HA) powder. The coated compacts were heat-treated at 840 <sup>o</sup>C. The coating thickness was found to increase with increasing soaking time, from 1.87 μm at 1-minute soaking to 9 μm at 5-minute soaking on the average. It was shown that at increasing soaking times, the originally open pores started to close, while at low soaking times the Ti<sub>6</sub>Al<sub>4</sub>V particles were partially coated. The coating layer was shown to be nanoporous and the depth of coating was observed to be relatively shallow: only few particles near the compact surface were HA-coated.</p>

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