The Interface Reaction between an Ag+-Doped TiO2 Film and Stainless Steel Substrate

2007 ◽  
Vol 336-338 ◽  
pp. 1559-1562 ◽  
Author(s):  
Xin Geng Ding ◽  
Ji Wei Gao ◽  
Qian Hong Shen ◽  
Jian Xiang Liu ◽  
Li Li
Keyword(s):  
Stainless Steel ◽  
Tio2 Film ◽  
Photoelectron Spectroscopy ◽  
Antibacterial Property ◽  
Steel Substrate ◽  
Sol Gel ◽  
Interface Reaction ◽  
Crystal Form ◽  
Acicular Crystal ◽  
X Ray

Ag+-doped TiO2 films on stainless steel were prepared by a sol-gel method and their microstructures and compositions were studied with X-Ray Diffractometer, Scanning Electron Microscope (SEM) and X-ray Photoelectron Spectroscopy. It was shown that Fe atoms in untreated stainless steel react with Ag+ in the TiO2 film and form FeTiO3, which has an acicular crystal form under SEM observation. As a result, Ag+ in the film is reduced to the silver atom, which degrades the antibacterial property of the film. However, after an oxidization of the substrate, a layer of ferric oxide is formed, which reacts with Fe atoms that would otherwise react with and reduce Ag+, and then forms FeTiO3. Thus, the penetration of Fe atoms is stopped and Ag+ in the anatase-structure TiO2 film is protected from the reduction, which enhanced antibacterial property of the film.

scholarly journals Silica-Copper Oxide Composite Thin Films as Solar Selective Coatings Prepared by Dipping Sol Gel

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
E. Barrera-Calva ◽  
J. Méndez-Vivar ◽  
M. Ortega-López ◽  
L. Huerta-Arcos ◽  
J. Morales-Corona ◽  
...  
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Copper Oxide ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Silica Matrix ◽  
Composite Thin Films ◽  
X Ray ◽  
Molar Ratios ◽  
Steel Substrates

Silica-copper oxide (silica-CuO) composite thin films were prepared by a dipping sol-gel route using ethanolic solutions comprised TEOS and a copper-propionate complex. Sols with different TEOS/Cu-propionate (Si/Cu) molar ratios were prepared and applied on stainless steel substrates using dipping process. During the annealing process, copper-propionate complexes developed into particulate polycrystalline CuO dispersed in a partially crystallized silica matrix, as indicated by the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses. The gel thermal analysis revealed that the prepared material might be stable up to400°C. The silica-CuO/stainless steel system was characterized as a selective absorber surface and its solar selectivity parameters, absorptance (α), and emittance (ε) were evaluated from UV-NIR reflectance data. The solar parameters of such a system were mostly affected by the thickness and phase composition of theSiO2-CuO film. Interestingly, the best solar parameters (α= 0.92 andε= 0.2) were associated to the thinnest films, which comprised a CuO-Cu2Omixture immersed in the silica matrix, as indicated by XPS.

Characteristics and Photocatalytic Activity of TiO2 Films Immobilized on Ceramic, Glass and Stainless Steel

2013 ◽  
Vol 295-298 ◽  
pp. 413-417 ◽  
Author(s):  
Zai Feng Shi ◽  
Su Min Zhang ◽  
Su Guo
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Photocatalytic Activity ◽  
Rate Constants ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Film Coating ◽  
Initial Concentration ◽  
X Ray ◽  
Ceramic Glass

To study the effects of substrate materials on the photocatalytic activity, TiO2films were immobilized on the inner wall surface of ceramic, glass and stainless steel tubes by sol-gel method. X-ray diffraction (XRD) results indicated that the crystal form of TiO2were all anatase type with theoretical particle size of 15 nm. According to the X-ray photoelectron spectroscopy (XPS) results, appearance of the element Na was observed which would decrease the photocatalytic activity. Scanning electron microscope (SEM) photos showed that the film coating on the ceramic and glass were even and uniform with thickness of about 300 nm and practical particle size of 20 nm to 100 nm. However, the film coating on stainless steel was hackly which would lead to diffraction of lights. The degradation rate constants of methylene blue (MB) with initial concentration of 5 mg.L-1were 0.049 min-1、0.029 min-1and 0.023 min-1with films coating on ceramic, stainless steel and glass tubes respectively. Degraded with TiO2film coating on ceramic tube, the according rate constants of phenol were 0.37, 0.14, 0.04 and 0.02 min-1for initial concentration of 2, 10, 50 and 100 mg.L-1respectively.

scholarly journals Characteristics of Carbide Interfacial Layer Formed During Deposition of DLC Films on 316L Stainless Steel Substrate

2017 ◽  
Vol 62 (4) ◽  
pp. 2211-2216 ◽  
Author(s):  
M. Dudek
Keyword(s):  
Stainless Steel ◽  
Photoelectron Spectroscopy ◽  
Interfacial Layer ◽  
316L Stainless Steel ◽  
Steel Substrate ◽  
Carbon Film ◽  
Ex Situ ◽  
Second Phase ◽  
X Ray ◽  
Dlc Film

AbstractThe paper presents the analysis of formation of interfacial layer during deposition of diamond like carbon film (DLC) on the 316L stainless steel by capacitive plasma discharge in the CH4atmosphere. The structure of the interfacial layer of DLC film was strongly affected by the temperature increase during the initial stages of the process. Initially, thin interfacial layer of 5 nm has been formed. As the temperature had reached 210°C, the second phase of the process was marked by the onset of carbon atoms diffusion into the steel and by the interface thickness increase. Finally, the growth of chromium carbide interface, the upward diffusion of chromium and nickel atoms to film, the etching and the decrease of the DLC film thickness were observed at 233°C. These investigations were carried out ex-situ by spectroscopic ellipsometry, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy.

Ag-Enhanced Antibacterial Property of MgO Film

2016 ◽  
Vol 859 ◽  
pp. 90-95 ◽  
Author(s):  
Zafer Alajmi ◽  
Tao Fu ◽  
Yan Tao Zhao ◽  
Shui Yun Yang ◽  
Jia Mao Sun
Keyword(s):  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Antibacterial Property ◽  
Thermal Analyses ◽  
Sol Gel ◽  
Inhibition Zone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Antibacterial Surface ◽  
Modification Of Titanium

MgO and silver-containing MgO (AgMgO, 3.3, 9.1 at% Ag) films were sol-gel coated on titanium to improve its antibacterial property. Thermal analyses of MgAc2·4H2O powder revealed that MgO was crystallized at 400 °C. X-ray diffraction analysis showed that MgO was converted to Mg(OH)2 or Mg5(CO3)4(OH)2·4H2O during the ageing in air. Silver nanoparticles at the surface of AgMgO films were identified by scanning electron microscopy and x-ray photoelectron spectroscopy. The MgO film was about 1.5 um thick. The potentiodynamic polarization test in the Ca-free Hank’s balanced salt solution showed that the coated titanium samples had better corrosion resistance than the polished one. The dissolution of silver nanoparticles resulted in a current peak in the polarization plots. In the antibacterial test against E. Coli, the inhibition zone width was 0.3, 1.6, 2.0 mm for the films with 0, 3.3, 9.1 at% Ag, respectively. The bactericidal mechanisms of the MgO and AgMgO films were discussed. The present work would provide a facile method for antibacterial surface modification of titanium based osteo-implants.

Photocathode Protection Properties of TiO2/V2O5 Coating

2009 ◽  
Vol 79-82 ◽  
pp. 651-654 ◽  
Author(s):  
Min Jie Zhou ◽  
Li Zhong
Keyword(s):  
Stainless Steel ◽  
Steel Substrate ◽  
Sol Gel ◽  
304 Stainless Steel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Illumination ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
Cathode Protection

Nano-sized TiO2/V2O5 bilayer coatings were prepared on type304 stainless steel substrate by sol-gel method and were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD). The performance of photocathode protection of the coating was investigated by the electrochemical method. SEM results indicate that the coating surface is continuous, uniform and dense, XRD spectra show that the coating is of anatase TiO2 and V2O5. The experimental results demonstrate that type 304 stainless steel with the bilayer coating can maintain cathode protection for 6h in the dark after irradiation by UV illumination for 1 h.

scholarly journals Hydrophobicity and Photocatalytic Activity of a Wood Surface Coated with a Fe3+-Doped SiO2/TiO2 Film

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2594 ◽  
Author(s):  
Luning Xuan ◽  
Yunlin Fu ◽  
Zhigao Liu ◽  
Penglian Wei ◽  
Lihong Wu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Composite Film ◽  
Wood Surface ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Crystal Form ◽  
Hydrophobic Property ◽  
X Ray

A Fe3+-doped SiO2/TiO2 composite film (Fe3+-doped STCF) was prepared on a wood surface via a sol–gel method to improve its photocatalytic activity and hydrophobicity. The structure of the composite film was analyzed by Fourier Transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity toward degradation of methyl orange and its hydrophobic nature were investigated. The results showed that the composite film was anatase TiO2 crystal form, and the addition of Fe3+ ions and SiO2 enhanced the diffraction peaks for the anatase crystal form. The photocatalytic activity of the wood coated with the composite film was enhanced. The highest degradation percentage was at 1 wt % Fe3+ (40.37%), and the degradation ability of the wood towards methyl orange solution was further improved under acidic conditions. In addition, the composite film was hydrophobic, and the hydrophobic property was enhanced as the immersion time in the sol increased. The wood surface coated with Fe3+-doped STCF exhibited strong hydrophobicity and photocatalytic activity, which could effectively prevent moisture from adhering to the surface and degrade organic pollutants; thus, the modified wood surface had good self-cleaning function.

scholarly journals Growth of MWCNTs on Flexible Stainless Steels without Additional Catalysts

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Udomdej Pakdee ◽  
Surasak Chiangga ◽  
Suchat Suwannatus ◽  
Pichet Limsuwan
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
Photoelectron Spectroscopy ◽  
Steel Substrate ◽  
Carbon Film ◽  
Chemical Vapor ◽  
Multiwalled Carbon ◽  
Sem Images ◽  
X Ray ◽  
Steel Substrates

Multiwalled carbon nanotubes (MWCNTs) were synthesized on austenitic stainless steel foils (Type 304) using a home-built thermal chemical vapor deposition (CVD) under atmospheric pressure of hydrogen (H2) and acetylene (C2H2). During the growth, the stainless steel substrates were heated at different temperatures of 600, 700, 800, and 900°C. It was found that MWCNTs were grown on the stainless steel substrates heated at 600, 700, and 800°C while amorphous carbon film was grown at 900°C. The diameters of MWCNTs, as identified by scanning electron microscope (SEM) images together with ImageJ software program, were found to be 67.7, 43.0, and 33.1 nm, respectively. The crystallinity of MWCNTs was investigated by an X-ray diffractometer. The number of graphitic walled layers and the inner diameter of MWCNTs were investigated using a transmission electron microscope (TEM). The occurrence of Fe3O4 nanoparticles associated with carbon element can be used to reveal the behavior of Fe in stainless steel as catalyst. Raman spectroscopy was used to confirm the growth and quality of MWCNTs. The results obtained in this work showed that the optimum heated stainless steel substrate temperature for the growth of effective MWCNTs is 700°C. Chemical states of MWCNTs were investigated by X-ray photoelectron spectroscopy (XPS) using synchrotron light.

The Physical and Antibacterial Properties of Argentine-Doped TiO2 Film on Stainless Steel Substrate

2007 ◽  
Vol 280-283 ◽  
pp. 801-804 ◽  
Author(s):  
Xin Geng Ding ◽  
Li Li
Keyword(s):  
Stainless Steel ◽  
Tio2 Film ◽  
Steel Substrate ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Abrasive Resistance ◽  
Doped Tio2 ◽  
Tio2 Anatase ◽  
Antibacterial Performance ◽  
Surface Oxidization

The aim of the present study is to investigate the physical properties and antibacterial performances of Ag+-doped TiO2 film on stainless steel and effects of surface oxidization. In the experiment, the surface of stainless steel was been oxidized by heat treatment (550°C, 1 hour) before the Ag+-doped TiO2 (anatase) film being formed by sol-gel method. Sample A (filmed after surface oxidization), B (filmed without surface oxidization), C (only surface oxidization) and D (neither oxidized nor filmed) were respectively tested for corrosive resistance, abrasive resistance and adhesiveness, and the samples with different content of argentine was tested for antibacterial performance. Results: 1) Corrosion rates of sample A, B, C and D in 10% FeCl3 solution are respectively 1.65%, 1.87%, 2.02% and 3.28%, suggesting that the film has protected the stainless steel from the corrosion; 2) Scratching using a loaded (150 g) pin makes no crack on surface of sample A, while it results a slight scuffing on surface of sample B, suggesting that the surface oxidization has enhanced the abrasive resistance and adhesiveness of the TiO2 film, which may be due to the bridge-like function of the oxidation film; 3)Antibacterial performance is enhanced as the content of doping argentine increases, exceeding 90% when the argentine reached 3%, and the TiO2 film on the oxidized stainless steel performs better in antibacterial test than untreated one.

scholarly journals CeOx/Al2O3 thin films on stainless steel substrate — Dynamical X-ray photoelectron spectroscopy investigations

2013 ◽  
Vol 536 ◽  
pp. 63-67 ◽  
Author(s):  
Ivalina Avramova ◽  
Sefik Suzer ◽  
Desislava Guergova ◽  
Dimitar Stoychev ◽  
Plamen Stefanov
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Photoelectron Spectroscopy ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
X Ray

Diamond deposition on Ni/Ni-diamond coated stainless steel substrate

1999 ◽  
Vol 14 (3) ◽  
pp. 1148-1152 ◽  
Author(s):  
A. K. Sikder ◽  
T. Sharda ◽  
D. S. Misra ◽  
D. Chandrasekaram ◽  
P. Veluchamy ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Photoelectron Spectroscopy ◽  
Steel Substrate ◽  
Chemical Vapor ◽  
Unit Cell ◽  
Diamond Growth ◽  
X Ray ◽  
Composite Layers ◽  
Spectroscopy Studies ◽  
Steel Substrates

Electrodeposited Ni and Ni-diamond composite layers were used as diffusion barriers for Fe to facilitate the diamond growth on stainless steel substrates. Raman spectroscopy and scanning electron microscopy show the formation of good quality diamond crystallites by chemical vapor deposition. X-ray diffraction results indicate that the expansion of Ni unit cell has taken place due to the formation of the Ni–C solid solution. This observation is also well supported by x-ray photoelectron spectroscopy studies. The lattice constant of the expanded Ni unit cell matches closely with the diamond, and this may be helpful in explaining the epitaxial growth of diamond on single-crystal Ni observed by others.

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