M.F. Achoi

Synthesis of TiO2 Nanowires via Hydrothermal Method

Titanium dioxide (TiO2) nanowires have been successfully synthesized by a simple, rapid, inexpensive, and novel approach based on a hydrothermal method. The use of hydrothermal treatment on TiO2 nanopowder as a precursor with highly concentrated sodium hydroxide for 6 h produced a novel nanostructure of TiO2 nanowires. The field-emission scanning electron microscopy (FESEM) image shows that the synthesized TiO2 nanowires are very abundant in quantity with diameters ranging from 8.0–14 nm and are extra long. X-ray diffraction (XRD) result indicates that the synthesized TiO2 nanowires are mainly composed of anatase phase with a minor of rutile phase. These properties of nanowires promise a broad range of applications in electronic devices.

Preparation and Characterizations of Nano-Hybrid TiO2/ZnO

This paper will present on preparation and characterizations of hybrid nanoTiO2/ZnO using sol-gel spin coating techniques. The study involved of modification band-gap energy of Titanium Dioxide (TiO2) at different precursor molecular concentration of Zinc oxide (ZnO). The FESEM (Field emission scanning electron microscope) morphological characterize shows TiO2 and ZnO particle produced at nanoscale size. The compositional of both particles confirmed using EDAX (Energy Disperse Analyzer X-ray) analysis. The XRD (X-Ray diffraction) characterize measured the structural properties of anatase and rutile for TiO2 as well as zincite for ZnO. By increasing ZnO molecular concentration, the crystallite size, d were decreased until the optimum sample, ratio of 4 TiO2 : 1 ZnO, with value of 23.71 nm. For UV-VIS (Ultra-Violet/Visible Spectroscopy) measurement, we found the optical band-gap increased with increasing ZnO molecular concentration. The optical band-gap for optimum sample was 3.38 e.V represented this study has successfully improved the optical band-gap of TiO2.

Effect of Concentration TTIP on Size Nano-Powder Titanium Dioxide (TiO2)

In this work, titanium Dioxide (TiO2) powder was prepared by sol gel method using Titanium (IV) Isopropoxide (TTIP) as precursor and Ethanol (C2H5OH) as solvent. The sol-gel was heated at temperature 150°C in 1 hour. Titanium Dioxide (TiO2) powder was milled with constant ball to powder ratio (BPR) of 10:1 with speed 600 rpm. Then the sample was characterized using Particle Size Analyzer, Raman Spectroscopy and Scanning Electron Microscope (SEM). Titanium Dioxide (TiO2) powder was prepared with three different concentration of TTIP to the size of Titanium Dioxide (TTIP) powder. Titanium Dioxide (TTIP) powder was milled with ball milling to produce nanopowder of Titanium Dioxide (TiO2).

Effect of Hydrothermal Growth Temperature on the Morphology and Structural Properties of Synthesized TiO2 Nanowires

Titanium dioxide nanowires have successfully prepared by hydrothermal method. The effect of hydrothermal growth temperature on the morphology and structural properties of TiO2 nanowires have been investigated. It was observed that at low temperature of 100 °C, the formation of nanowires was at early stage, while hydrothermal treatment at 130 °C showed the TiO2 precursor acquired enough energy for formation of the nanowires. Increased the temperature to 200 °C was formed the bundle of nanowires in microsize. The diameter of nanowires increased as the temperature increased. The TiO2 nanowires produced at temperature of 150 °C and annealed at 500 °C showed highest crystallinity with anatase phase.

Solvothermal Synthesized of TiO2 Microspheres and their Characterization

In this paper, we have successfully synthesized TiO2 microsperes by solvothermal method using titanium (IV) isopropoxide as titanium source and ethanol as a solvent. The solution was thermally treated at relatively low temperature of 150 °C for 3 hours. The as-prepared and annealed of TiO2 microsphere were characterized using FESEM, XRD and Raman spectroscopy. The diameter of the microspheres was 1-6 µm. The X-ray diffraction and Raman spectroscopy studies show that the microspheres has anatase phase.

A Comparative Study of TiO2 Nanocoated Mild Steel Surface Properties between Short and Long Sputtering Time of RF Magnetron

TiO2 nanocoated mild steel surface has been successfully prepared via 100 watt of RF magnetron sputtering by using TiO2 target and sputtering condition was performed in 80sccm argon gas. The studied was done in comparing the surface properties of TiO2 nanocoated mild steel between short term and long term sputtering time at 5 and 60 minutes, respectively. From the results, we have found that the long-term sputtering time producing good surface coating with lower surface roughness at 0.033 nm with thickness in nanometer scale is 169 nm via AFM. Through Auger study revealed that the coating attributed Ti and O elements at energy of 383.48 eV and 483.44 eV, respectively. It was also showed that the intensity of that element high at about 100k a.u. in long-term compared to 55k a.u. short-term of sputtering time. It is thus showed that producing coating depends upon manipulation of parameter in RF magnetron sputtering.

Structural and Optical Properties of Nanohybrid PMMA/TiO2

Preparation of nanohybrid PMMA/TiO2 hybrid was reported by using mixture sol-gel spin coating method. This studied involve modification band gap of TiO2 at different molar concentration of TTiB precursor. AFM image show TiO2 particles encapsulated with PMMA matrix. From UV-Vis spectroscope, we have found as increase of TTiB precursor molar concentration, optical band gap is 3.34 eV, increase in UV-range from 3.25 eV. This study suggested for improvement of optical band gap TiO2 coated glass.

Preparation and Characterizations Cotton Coated Titanium Dioxide, TiO2

Cotton coated titanium dioxide, TiO2 was prepared by using immersion method. Three samples with different concentration which are 0.2 M, 0.5 M and 0.6 M of TiO2 solution with fixed value of temperature and time immersion has been used in this project. Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD) and Ultraviolet/Visible (UV-Vis) Spectrophotometer have been used to determine the properties of samples. The surface morphology of the cotton, crystalline phase of TiO2 particles deposited on the cotton fiber and the amount of the TiO2 particles dispersed in the water has been investigated. The existence of TiO2 on the cotton fiber was identified by using SEM and XRD where the immersion method that has been used in this project contributed to the agglomerated TiO2 particles on the surface of cotton fiber. None of the samples showed the formation of anatase crystalline phase of TiO2 particle and UV-Vis showed the released of TiO2 in the water was higher in the first immersion and decreased exponentially for the second, third and fourth immersion.

Atomic Force Microscope (AFM) Studies of TiO2 Nanocoated Glass Surface via Sol-Gel Coating

Atomic Force Microscope (AFM) has been used to study the surface properties of TiO2 nanocoated glass surface at atomic level. TiO2 nanocoated glass surface was prepared by synthesis of titanium butoxide (TTiB) as precursor and was then deposited on glass surface via spin-coating technique. The AFM details studied of TiO2 nanocoated glass surface revealed that the nanoparticle was uniformly distributed throughout glass surface with growth of TiO2 nanostructures below 12 nm via AFM surface morphology and topography characterization, respectively. It was also showed that the cross-sectional view analysis is 5.22 nm and surface roughness, Ra, of coating is 0.858 nm, respectively. The TiO2 nanostructures were successfully seen grew at 0.2 M of sol-gel solution. It confirmed that for the coating application at nanometer scale level on the glass-based material equipment.

Surface Compositional, Structural and Optical Properties of Nanohybrid TiO2/ZnO Coated Silicone Surface

This paper reports on preparation and characterizations of nanohybrid TiO2/ZnO using sol-gel spin-coating techniques. The study involved of modification band-gap energy of Titanium dioxide (TiO2) at different precursor molecular concentration of Zinc oxide (ZnO). The Field Emission Scanning Electron Microscope (FESEM) for morphological characterization showed the existence of TiO2 and ZnO particles at 20 nm scale of magnification. The compositional of both particles were then confirmed using Energy Disperse Analyzer X-Ray (EDAX) analysis which indicates the elements of Ti, O and Zn exhibited EDAX spectras at about 0.5 and 1.0 keV while silicone (Si) at 1.75 keV. The X-Ray diffraction (XRD) characterized the structural properties of anatase and rutile for TiO2, and zincite for ZnO, then crystallite size for both elements. AT optimum molar concentration ratio of nanohybrid TiO2/ZnO is 1:4 (0.20M), the crystallite size, d, is 23.71 nm with peak of anatase found at diffraction angle of 48.05? and 62.50? while at 33.25? and 55.06? is rutile phase, respectively. We have found the distribution of nanohybrid TiO2/ZnO particles dispersed homogeneously since the particles were not bonded together with increasing ZnO molar concentration. From Ultra-Violet/Visible-near-infrared spectroscopy (UV-Vis-NiR), we have found the optical band-gap energy of nanohybrid TiO2/ZnO was increased at 3.38 eV, while the transmittance percentage is 88.67%. This studied was successfully improved the optical band-gap energy of TiO2 and the results suggests for improvement of optical band-gap energy TiO2.