ELECTROPHORETIC DEPOSITION OF TITANIUM DIOXIDE NANO-POWDERS FILMS IN ISOPROPANOL AS A SOLVENT

2008 ◽  
Vol 22 (18n19) ◽  
pp. 2989-2994 ◽  
Author(s):  
M. GHORBANI ◽  
M. ROUSHAN AFSHAR
Keyword(s):  
Titanium Dioxide ◽  
Packing Density ◽  
Deposition Time ◽  
Substrate Surface ◽  
Scanning Probe ◽  
Deposition Parameters ◽  
Deposition Voltage ◽  
Probe Microscope ◽  
Deposited Films ◽  
Scanning Electron

In this study, titanium dioxide nano powders were electrophoretically deposited on the stainless steel in Isopropanol and Triethanolamine as a solvent and dispersant, respectively. The effects of deposition parameters including deposition voltage (5 to 20 V) and deposition time (5 to 60 s) on the microstructure and surface topography were examined by scanning electron microscope (SEM) and scanning probe microscope (SPM), respectively. In addition, the effects of these deposition parameters on packing density were investigated. This research revealed that substrate surface is fully covered with increasing deposition voltage and deposition time. Therefore packing density of deposited films is strongly dependent on the deposition parameters and reached its highest value at 20 V and 60 s. In addition, results show that surface roughness is increased by increasing the deposition voltage and deposition time.

Electrophoretic Deposition of Titania Nanopowders

2009 ◽  
Vol 412 ◽  
pp. 77-82 ◽  
Author(s):  
Mohammad Ghorbani ◽  
Milad Roushanafshar
Keyword(s):  
Electrophoretic Deposition ◽  
Steel Sheet ◽  
Scanning Probe ◽  
Deposition Method ◽  
Stainless Steel Sheet ◽  
Deposition Parameters ◽  
Probe Microscope ◽  
The Stability ◽  
Scanning Electron ◽  
Deposition Conditions

Titania Nanopowders were successfully deposited on stainless steel sheet by means of electrophoretic deposition method from titania suspension in which isopropanol was employed as a solvent and Triethanolamine as a dispersant. The effect of TEA addition on the stability of nanopowders in suspensions was examined by sedimentation test; in addition, Malvern zeta sizer was employed for determination their particle size. Electrophoretic Deposition was done at different deposition conditions of voltage (5-20 volts) and time (5-60 sec) and the scanning electron microscopy (SEM) was used to investigate the effect of suspension composition and deposition parameters on the microstructure of coatings. Furthermore, the effect of deposition parameters on the consistencies of different coatings was analyzed by Scanning Probe Microscope (SPM).

Studies on Magnetron-Sputtered NiO/Si3N4 Thin Films

2018 ◽  
Vol 17 (03) ◽  
pp. 1760039
Author(s):  
K. M. Dhanisha ◽  
M. Manoj Christopher ◽  
M. Abinaya ◽  
P. Deepak Raj ◽  
M. Sridharan
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Smooth Surface ◽  
Deposition Time ◽  
Si Substrate ◽  
X Ray ◽  
Coating Time ◽  
Deposited Films ◽  
Nio Films ◽  
Scanning Electron

The present work deals with NiO/Si3N4 layers formed by depositing nickel oxide (NiO) thin films over silicon nitrate (Si3N[Formula: see text] thin films. NiO films were coated on Si3N4-coated Si substrate using magnetron sputtering method by changing duration of coating time and were analyzed using X-ray diffractometer, field emission-scanning electron microscopy, UV–Vis spectrophotometer and four-point probe method to study the influence of thickness on physical properties. Crystallinity of the deposited films increases with increase in thickness. All films exhibited spherical-like structure, and with increase in deposition time, grains are coalesced to form smooth surface morphology. The optical bandgap of NiO films was found to decrease from 3.31[Formula: see text]eV to 3.22[Formula: see text]eV with upsurge in the thickness. The film deposited for 30[Formula: see text]min exhibits temperature coefficient resistance of [Formula: see text]1.77%/[Formula: see text]C as measured at 80[Formula: see text]C.

Electrophoretic Deposition of TiO2 Nanoparticles on Dense TiO2-x Ceramic Electrodes

2016 ◽  
Vol 721 ◽  
pp. 177-181
Author(s):  
Inga Narkevica ◽  
Laura Stradina ◽  
Liga Stipniece ◽  
Jurijs Ozolins
Keyword(s):  
Phase Transformation ◽  
Deposition Time ◽  
Thermal Stresses ◽  
Surface Damage ◽  
Rutile Phase ◽  
Deposition Parameters ◽  
Deposition Voltage ◽  
Deposition Yield ◽  
Ceramic Electrodes

TiO2 nanoparticles were electrophoretically deposited on the dense TiO2-x ceramic electrodes from suspension containing TiO2 nanoparticles, isopropanol as a solvent and triethanolamine as dispersant. The effect of deposition parameters including deposition voltage (10 to 60 V) and deposition time (10 to 40 min) on the microstructure and deposition yield was examined. It was found that the thickness of coating increased with increasing deposition time and deposition voltage. However, it affected the quality of obtained coating e.g. cracks and holes were observed. Optimizing deposition parameters homogeneous coating with smooth microstructure and limited surface damage can be obtained. Thermal treatment of the coating in the temperature range from 700 to 1100 °C causes anatase to rutile phase transformation. Crack formation was noted during sintering due to the phase transformation and thermal stresses.

Carbon-Nanotube Engineering for Probes and Tweezers Operating in Scanning Probe Microscope

2003 ◽  
Vol 772 ◽  
Author(s):  
Yoshikazu Nakayama ◽  
Seiji Akita
Keyword(s):  
Electron Microscope ◽  
Carbon Nanotube ◽  
Scanning Electron Microscope ◽  
Scanning Probe Microscope ◽  
Scanning Probe ◽  
Knife Edge ◽  
Maximum Current ◽  
Probe Microscope ◽  
Carbon Nanotube Devices ◽  
Scanning Electron

AbstractWe have developed a series of processes for preparing carbon nanotube devices of probes and tweezers that operate in scanning probe microscope (SPM). The main developments are a nanotube cartridge where nanotubes are aligned at a knife-edge to be easily picked up one by one and a scanning-electron-microscope manipulator by which a nanotube is transferred from the nanotube cartridge onto a Si tip under observing its view.We have also developed the electron ablation of a nanotube to adjust its length and the sharpening of a multiwall nanotube to have its inner layer with or without an end cap at the tip. For the sharpening process, the free end of a nanotube protruded from the cartridge was attached onto a metal-coated Si tip and the voltage was applied to the nanotube. At a high voltage giving the saturation of current, the current decreased stepwise in the temporal variation, indicating the sequential destruction of individual nanotube layers. The nanotube was finally cut at the middle of the nanotube bridge, and its tip was sharpened to have an inner layer with an opened end. Moving up the cartridge before cutting enables us to extract the inner layer with an end cap.It is evidenced that the maximum current at each layer during the stepwise decrease depends on its circumference, and the force for extracting the inner layer with ∼ 5nm diameter is ∼ 4 nN.

Nanoengineering of Carbon Nanotubes and the Status of its Applications

2001 ◽  
Vol 706 ◽  
Author(s):  
Yoshikazu Nakayama ◽  
Seiji Akita
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Arc Discharge ◽  
Scanning Probe Microscope ◽  
Scanning Probe ◽  
Gas Temperature ◽  
The Status ◽  
Probe Microscope ◽  
Scanning Electron

AbstractWe have developed a well-controlled method for manipulating carbon nanotubes. The first crucial process involved is to prepare a nanotube array, named nanotube cartridge. We have found the ac electrophoresis of nanotubes by which nanotubes are aligned at the knife-edge. The nanotubes used were multiwalled and prepared by an arc discharge with a relatively high gas temperature. The second important process is to transfer a nanotube from the nanotube cartridge onto a substrate in a scanning electron microscope. Using this method, we have developed nanotube tips and nanotube tweezers that operate in a scanning probe microscope. The nanotube probes have been applied for observation of biological samples and industrial samples to clarify their advantages. The nanotube tweezers have demonstrated their motion in scanning-electron-microscope and operated to carry nanomaterials in a scanning probe microscope.

INTEGRATION OF LASER MBE GROWN OXIDE THIN FILMS OF SrTiO3 WITH YBa2Cu3Oy FOR TUNABLE APPLICATIONS

2007 ◽  
Vol 14 (04) ◽  
pp. 833-836 ◽  
Author(s):  
J. H. HAO ◽  
J. GAO
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Frequency Tuning ◽  
Substrate Surface ◽  
Scanning Probe ◽  
Dielectric Measurements ◽  
Dielectric Constant And Loss ◽  
Probe Microscope ◽  
Laser Mbe ◽  
Electrical Bias

The frequency tuning can be achieved by integrating SrTiO 3 (STO) thin films into high-temperature superconducting YBa 2 Cu 3 O y (YBCO) devices and tuning the dielectric constant of the STO films by an electrical bias. We have fabricated epitaxial STO thin films on superconducting YBCO. By the combination of various surface characterizations such as scanning probe microscope, structural and dielectric measurements, we attempted to understand the fundamental mechanisms of dielectric properties in STO thin films. Substrate surface and structural properties of the heterostructure were studied. We have measured the temperature dependence of dielectric constant and loss tangent of STO thin films. The system exhibits 41% dielectric constant tuning over a bias of 4 V at low temperature.

Excimer Laser Induced Deposition of Tungsten from W(CO)6 and WF6

1989 ◽  
Vol 158 ◽  
Author(s):  
Berthold Rager ◽  
Friedrich Bachmann
Keyword(s):  
Deposition Time ◽  
Deposition Process ◽  
Layer Growth ◽  
X Ray Diffraction ◽  
Reflectivity Measurement ◽  
Model Calculations ◽  
Deposition Parameters ◽  
Initial Stage ◽  
Deposited Films

ABSTRACTArF laser induced deposition of W from W(CO)6 and WF6 on Si/SiO2 surfaces was investigated. With an in-situ reflectivity measurement the growth of the layer could be monitored during the deposition process. We find that the initial stage of layer growth as well as the reflectivity as a function of deposition time depends on the laser fluence and on other deposition parameters. Model calculations, using the optical constants of deposited films, determined by ellipsometry, have been performed to compare the measured reflectivity curves with the calculated curves. The deposited layers have been analyzed by XPS, AES, X-ray Diffraction and Raman Spectroscopy. Additionally, experiments of direct pattern transfer deposition (via contact mask) with W(CO)6 show the presence of an involved surface process, which by Fresnel diffraction caused structures smaller than 0.5μm.

scholarly journals The Influence of the Deposition Parameters on the Properties of Ni-Cu Deposition

2019 ◽  
Vol 70 (1) ◽  
pp. 45-49
Author(s):  
Oana Claudia Ciobotea Barbu ◽  
Ioana Alina Ciobotaru ◽  
Florin Mihai Benga ◽  
Danut Ionel Vaireanu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Current Density ◽  
Deposition Time ◽  
Steel Substrate ◽  
Deposition Process ◽  
Deposition Parameters ◽  
Temperature Scanning ◽  
Scanning Electron

This paper discusses the properties of some Ni-Cu deposits obtained on a steel substrate, which may be employed as supercapacitor plates. In order to achieve plates with different properties, one has varied the parameters of the deposition process such as deposition time, current density and temperature. Scanning electron microscopy and dispersive energy spectrometry were employed for the determination of the structure and composition of the Ni-Cu deposits. The plates with the Ni-Cu deposits were used to create supercapacitors and their capacitance values were also determined.

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