Electrical and Physical Property of TiO2 Films Prepared at Different Deposition Time

Titanium Dioxide film will be deposited on a glass slide substrate by spin coating technique which is the frequently used technique because of its easy operation and cheap due to the sol gel preparation. The deposited films were then characterized by cross section technique using Field Emission Scanning Electron Microscopy (FESEM) to investigate the thickness based on the number of coatings. Then by the same FESEM, the surface morphology was studied to see the grain size and the porosity of each film based on the number of coatings. AFM was used to see the uniformity of the thin film's surface. Then by using current voltage (IV) measurement, the electrical property of the film can be studied, from IV characterization the resistivity of the film will be calculated. In this investigation, it is found that by increasing the coating layer, the resistivity values were decreasing whereas the conductivity of the film is increasing since conductivity is the inverse of resistivity. The porosity of the film also increases with the coating layers.

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Sol-Gel Preparation of HAp-Coated Silica Macrospheres from Water Glass and their Protein Adsorption

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.529-530.637 ◽

2012 ◽

Vol 529-530 ◽

pp. 637-640

Author(s):

Jie Li ◽

Yuki Shirosaki ◽

Satoshi Hayakawa ◽

Artemis Stamboulis ◽

Akiyoshi Osaka

Keyword(s):

Water Glass ◽

Electrostatic Interactions ◽

Coating Layer ◽

Sol Gel ◽

Adsorption Model ◽

Silica Source ◽

Layer Adsorption ◽

Protein Molecules ◽

Gel Preparation ◽

Ca Alginate

Silica gel macrospheres of 2~4 mm in size, and wrapped with Ca-alginate chelate film were prepared as the substrate for hydroxyapatite coating layer, using water glass as the silica source. Those Ca-SiO2 macrospheres were soaked in a 1:1 (volume) mixture of ethanol and 0.1 M Na2HPO4 to deposit hydroxyapatite layer (HAp-SiO2 macrospheres). Adsorption of bovine serum albumin and egg lysozyme on those Ca-SiO2 and HAp-SiO2 macrospheres under physiological pH (7.2) was well correlated to the Langmuir-type adsorption equation. The electrostatic interactions between the protein molecules and those macrospheres well interpret the adsorption isotherms, while the mesopores in the Ca-SiO2 contributed to some extent. A multi-layer adsorption model was proposed.

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Influence of Cubic Structured-ZnSnO3 Immersion Time to the Performance of Humidity Sensor

Nano Hybrids ◽

10.4028/www.scientific.net/nh.2.1 ◽

2012 ◽

Vol 2 ◽

pp. 1-11 ◽

Cited By ~ 5

Author(s):

Nor Diyana Md Sin ◽

Noor Khadijah ◽

Mohamad Hafiz Mamat ◽

Musa Mohamed Zaihidi ◽

Mohamad Rusop

Keyword(s):

Thin Film ◽

Structural Properties ◽

Humidity Sensor ◽

Deposition Time ◽

Sol Gel ◽

Rf Magnetron Sputtering ◽

Immersion Method ◽

Current Voltage ◽

Humidity Chamber

ZnSnO3 thin film was deposited at different deposition time (0.5 h, 2 h, 4 h and 6 h) using sol-gel immersion method and the electrical, optical and structural properties of this film was investigated. This research involved the preparation of nanostructured ZnO thin film by using RF magnetron sputtering, preparation of ZnSnO3 sol-gel solution, metal contact deposition and characterization of humidity sensor. The thin film was characterized using current-voltage (I-V) measurement (Keithley 2400) and field emission scanning electron microscopy (FESEM) (JEOL JSM 6701F) for electrical and structural properties respectively. The sensor was characterized using I-V measurement in a humidity chamber (ESPEC SH-261) and the chamber has been set at room temperature with varied relative humidity (% RH), in the range of 40-90% RH. The film prepared with a deposition time of 2 h shows better sensitivity for humidity sensor. The FESEM investigation shows that crystal size increases with the increasing deposition time.

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UV Photodetector Based on Mg-Doped GaN Thin Films Prepared by Sol-Gel Spin Coating

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.290.208 ◽

2019 ◽

Vol 290 ◽

pp. 208-213

Author(s):

Mohd Amin Nurfahana ◽

Sha Shiong Ng

Keyword(s):

Thin Films ◽

Sol Gel ◽

Thermionic Emission ◽

Phonon Modes ◽

Uv Photodetector ◽

Hall Effects ◽

Current Voltage ◽

Structural Lattice ◽

Deposited Films ◽

Mg Doped

In this work, sol-gel spin coated of magnesium (Mg) doped gallium nitride (GaN) thin films grown on AlN sapphire substrate was reported. The structural, lattice vibrational, and electrical properties of the deposited films were investigated and compared. X-ray diffraction results show that the deposited films composed of wurtzite structure with preferred orientation of GaN(002). The Raman active phonon modes correspond to the E2(high) and A1(LO) at 568 cm-1 and 733 cm-1 phonon modes of the hexagonal GaN were observed, while a broad peak attributed to the Mg-related lattice vibrational mode was detected at 669 cm-1. The Raman phonon modes were detected by using Raman spectroscopy. Hall effects results show that the resistivity, carrier concentration, and hall mobility of the Mg-doped GaN film was 0.1397 Ω cm, 1.77 × 1018 cm3, and 6.04 cm2/Vs, respectively. Besides, the characteristics of the ultraviolet (UV) photoresponse of the fabricated detector were investigated. The current-voltage characteristics of the Mg-doped GaN UV photodetector exhibits Schottky behaviour. The current-voltage measurements were carried out at room temperature with a computer-controlled integrated Source Meter (Keithley 2400). Lastly, the ideality factor and Schottky barrier heights were calculated using thermionic emission theory.

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Fabrication of Nanostructure-Based Copper Oxide Biosensor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1109.376 ◽

2015 ◽

Vol 1109 ◽

pp. 376-380 ◽

Cited By ~ 1

Author(s):

M. Safwan Azmi ◽

Sharipah Nadzirah ◽

Uda Hashim

Keyword(s):

Copper Oxide ◽

Oxidation Process ◽

Sol Gel ◽

Pattern Transfer ◽

Paper Briefly ◽

Wafer Cleaning ◽

Aluminum Metal ◽

Current Voltage ◽

Gel Preparation ◽

Silicon Wafer Cleaning

The purpose of this paper is to give a review of the fabrication of nanostructure-based copper oxide biosensor. This paper briefly covers processes from silicon wafer cleaning, oxidation process, silicon nitride deposition, aluminum metal deposition, pattern transfer, copper oxide sol-gel preparation and coating and lastly IV testing with the results expected from the completed device.Keywords: Nanostruture, copper oxide, biosensor, sol-gel, current-voltage testing.

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Enhanced Performance of Al-Doped Zinc Oxide Nanorods at Different Concentration Using Sol-Gel Preparation Methods towards Humidity Sensing Application

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1109.519 ◽

2015 ◽

Vol 1109 ◽

pp. 519-523

Author(s):

Ahmad Syakirin Ismail ◽

Mohd Firdaus Malek ◽

Muhammad Amir Ridhwan Abdullah ◽

Mohamad Hafiz Mamat ◽

M. Rusop

Keyword(s):

Zinc Oxide ◽

Sol Gel ◽

Zno Nanorods ◽

Zinc Oxide Nanorods ◽

Al Doping ◽

Preparation Methods ◽

Current Voltage ◽

Oxide Nanorods ◽

Sensing Application ◽

Gel Preparation

Zinc oxide (ZnO) nanorods with different Aluminium (Al) – doping concentration (at%) has been deposited on glass substrate. The concentrations of Al were varied from 0 (undoped), 0.2, 0.8, and 3 at %. Field emission scanning electron microscopy (FESEM) was used to study the structural properties of the samples, UV-vis for absorbance and transmittance coefficient, and current voltage (I-V) measurement for electrical properties. From the results, it is observed that the diameter size of nanorods were reduced upon the increasing of Al-concentration. The I-V measurement showed that the 0.8 at% doping sample produced the highest conductivity.

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Preparation and properties of a long time durable superhydrophilic titanium dioxide film obtained by a sol-gel process

Materials Testing ◽

10.3139/120.110969 ◽

2017 ◽

Vol 59 (1) ◽

pp. 81-85

Author(s):

Jianjun Zhang ◽

Hao Zeng ◽

Chun Liu ◽

Chao Li ◽

Sude Ma ◽

...

Keyword(s):

Titanium Dioxide ◽

Sol Gel ◽

Titanium Dioxide Film ◽

Sol Gel Process ◽

Long Time ◽

Dioxide Film

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Efficient Micromixing for Continuous Biodiesel Production from Jatropha Oil

Nanoscience &Nanotechnology-Asia ◽

10.2174/2210681207666170718160304 ◽

2018 ◽

Vol 9 (1) ◽

pp. 133-139

Author(s):

Waleed S. Mohammed ◽

Ahmed H. El-Shazly ◽

Marwa F. Elkady ◽

Masahiro Ohshima

Keyword(s):

Methyl Esters ◽

Continuous Process ◽

Sol Gel ◽

Average Diameter ◽

Biodiesel Production ◽

High Mass ◽

Molar Ratio ◽

Jatropha Oil ◽

Energy Deficiency ◽

Gel Preparation

Introduction: The utilization of biodiesel as an alternative fuel is turning out to be progressively famous these days because of worldwide energy deficiency. The enthusiasm for utilizing Jatropha as a non-edible oil feedstock is quickly developing. The performance of the base catalyzed methanolysis reaction could be improved by a continuous process through a microreactor in view of the high mass transfer coefficient of this technique. Materials & Methods: Nanozirconium tungstovanadate, which was synthetized using sol-gel preparation method, was utilized in a complementary step for biodiesel production process. The prepared material has an average diameter of 0.066 &µm. Results: First, the NaOH catalyzed methanolysis of Jatropha oil was investigated in a continuous microreactor, and the efficient mixing over different mixers and its impact on the biodiesel yield were studied under varied conditions. Second, the effect of adding the nanocatalyst as a second stage was investigated. Conclusion: The maximum percentage of produced methyl esters from Jatropha oil was 98.1% using a methanol/Jatropha oil molar ratio of 11 within 94 s using 1% NaOH at 60 &°C. The same maximum conversion ratio was recorded with the nanocatalyst via only 0.3% NaOH.

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Sol-gel preparation and properties of electroconductive Sn–Al co-doped ZnO coated TiO2 whisker and its applications in textiles

Materials Science in Semiconductor Processing ◽

10.1016/j.mssp.2020.105607 ◽

2021 ◽

Vol 124 ◽

pp. 105607

Author(s):

Ziao Xu ◽

Yanan Zhu ◽

Zengyuan Pang ◽

Mingqiao Ge

Keyword(s):

Sol Gel ◽

Doped Zno ◽

Gel Preparation ◽

Co Doped

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Chemical and Structural Characterization of Amorphous and Crystalline Alumina Obtained by Alternative Sol–Gel Preparation Routes

Materials ◽

10.3390/ma14071761 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1761

Author(s):

Izabela Rutkowska ◽

Jakub Marchewka ◽

Piotr Jeleń ◽

Mateusz Odziomek ◽

Mateusz Korpyś ◽

...

Keyword(s):

Infrared Spectroscopy ◽

Aluminum Oxide ◽

Physicochemical Properties ◽

Sol Gel ◽

Magic Angle Spinning ◽

Magic Angle ◽

Bet Method ◽

Gel Preparation ◽

Angle Spinning ◽

Middle Infrared

Aluminum oxide is one of the most commonly used materials in the industry. It is used in the field of catalysis, refractories, and optics. Despite the fact that there are many techniques available, there is still a great challenge in obtaining a material with desired and designed properties. Nevertheless, there is a great flexibility in making customized alumina materials with desired physicochemical properties synthesized by sol–gel methods. This work consists in characterizing the physicochemical properties of sol–gel synthesized aluminum oxide using different sol–gel preparation routes. Three different sols were obtained by using organic precursors and underwent thermal treatment. The structure (Middle Infrared Spectroscopy, Diffused Reflectance Infrared Spectroscopy, X-ray Diffraction, Magic Angle Spinning Nuclear Magnetic Resonance) and microstructure (Scanning Electron Microscopy with Electron Dispersive Spectroscopy) tests of the materials were carried out. The specific surface area was determined by using the Brunauer–Emmett–Teller (BET) method. Thermal analysis was performed for all the powders, in order to analyze the specific temperature of materials transformation.

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