scholarly journals Control over Vertical Orientation of Liquid Crystal using Spin Coated Silica Nanoparticles Layer on Conductive Substrates

2021 ◽  
Vol 2070 (1) ◽  
pp. 012039
Author(s):  
Ankit Rai Dogra ◽  
Vandna Sharma ◽  
Partha Khanra ◽  
Pankaj Kumar
Keyword(s):  
Indium Tin Oxide ◽  
Self Assembly ◽  
Contrast Ratio ◽  
Chemical Vapour ◽  
Vertical Orientation ◽  
Glass Substrates ◽  
Capillary Method ◽  
Electro Optic ◽  
Ito Glass ◽  
Conductive Substrates

Abstract Recently, various techniques such as self-assembly, chemical vapour deposition and capillary method etc. are used for nanoparticles (NPs) deposition on the conductive substrates for the vertical alignment (VA) of liquid crystals (LCs). The initial VA of LCs in display devices have the potential impact on industry and various electro-optic devices applications. In the present work, vertical orientation of LCs was controlled on silica (SiO2) nanoparticles (NPs) layer deposited on indium tin oxide (ITO) glass substrates using spin coating method. The VA LC cell was also prepared for conventional polyimide coated ITO glass substrates. The morphological images showed the initial darker textures under crossed polarizers and conoscopic image with dark cross confirmed the VA of LC on SiO2 NPs coated substrates analogous to the conventional VA LC cell. Further, electro-optic results revealed the reduction in applied voltage and better contrast ratio for SiO2 NPs coated VA LC cell compared with polyimide coated VA LC cell.

scholarly journals Microwave Spectroscopic Detection of Human Hsp70 Protein on Annealed Gold Nanostructures on ITO Glass Strips

Biosensors ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 118
Author(s):  
Rodica Ionescu ◽  
Raphael Selon ◽  
Nicolas Pocholle ◽  
Lan Zhou ◽  
Anna Rumyantseva ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Stress Disorders ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Conductive Glass ◽  
Hsp70 Protein ◽  
Atomic Force ◽  
Ito Glass ◽  
First Time ◽  
Human Heat Shock Protein

Conductive indium-tin oxide (ITO) and non-conductive glass substrates were successfully modified with embedded gold nanoparticles (AuNPs) formed by controlled thermal annealing at 550 °C for 8 h in a preselected oven. The authors characterized the formation of AuNPs using two microscopic techniques: scanning electron microscopy (SEM) and atomic force microscopy (AFM). The analytical performances of the nanostructured-glasses were compared regarding biosensing of Hsp70, an ATP-driven molecular chaperone. In this work, the human heat-shock protein (Hsp70), was chosen as a model biomarker of body stress disorders for microwave spectroscopic investigations. It was found that microwave screening at 4 GHz allowed for the first time the detection of 12 ng/µL/cm2 of Hsp70.

scholarly journals Opto-Electronic Properties of Epoxy/Silicone Blend Based Thin Films

2021 ◽  
Author(s):  
Younes Ziat ◽  
Hamza Belkhanchi ◽  
Maryama Hammi ◽  
Charaf Laghlimi ◽  
A Moutcine
Keyword(s):  
Thin Films ◽  
Indium Tin Oxide ◽  
Optical Transition ◽  
Sol Gel ◽  
Glass Substrates ◽  
Nanostructured Thin Films ◽  
Ito Glass ◽  
Potential Applications ◽  
Optical Applications ◽  
Nitrogen Doped Carbon

Abstract Recently, the rise of two dimensional amorphous nanostructured thin films have ignited a big interest because of their intriguingly isotropic structural and physical properties leading to potential applications in the nano-optoelectronics. However, according to literature, most of optoelectronic properties are investigated on chalcogenides related heterostructures. This has motivated the present work aiming to provide a new platform for the fabrication, examination of the properties and the applications of 2D nanostructured thin films based on epoxy/silicone blend. Thin films of Epoxy/Silicone loaded with nitrogen doped carbon nanotubes (N-CNTs) were prepared by sol-gel method and deposited on Indium Tin Oxide (ITO) glass substrates at room temperature. Further examination of optical properties aimed the investigation of optical pseudo-gap and Urbach energy and enabled the determination of processed films thickness based on Manifacier and Swanepol method. The results indicated that the unloaded thin films have a direct optical transition with a value of 3.61 eV followed by noticeable shift towards narrowing gaps depending on the loading rate. Urbach's energy is 0.19 eV for the unloaded thin films, and varies from 0.43 to 1.33 eV for the loaded thin films with increasing the rate of N-CNTs. It is inversely variable with the optical pseudo-gap. Finally, Epoxy/Silicone loaded with N-CNTs nanocomposites films can be developed as active layers with specific optical characteristics, giving the possibility to be used in electro-optical applications.

Spectroscopic Ellipsometry of the Optical Functions of Some Widely Used Organic Light Emitting Diodes (OLEDs) Materials.

2005 ◽  
Vol 871 ◽  
Author(s):  
Z. T. Liu ◽  
C. C. Oey ◽  
A. B. Djuriši ◽  
C. Y. Kwong ◽  
C. H. Cheung ◽  
...  
Keyword(s):  
Spectroscopic Ellipsometry ◽  
Indium Tin Oxide ◽  
High Vacuum ◽  
Light Emitting ◽  
Glass Substrates ◽  
Optical Functions ◽  
Conducting Materials ◽  
Ito Glass ◽  
Polystyrene Sulfonic Acid

AbstractIn this work, optical functions of some widely used OLEDs materials 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), tris (8-hydroxyquinoline) aluminum (Alq3), (N,N′-di(naphthalene-1-yl)-N,N′- diphenylbenzidine (NPB),poly(3,4,-ethylene dioxythiophene):polystyrene sulfonic acid (PEDOT:PSS) and indium tin oxide (ITO)) were studied using spectroscopic ellipsometry (SE) in the spectral range from 1.55 eV to 4.1 eV (wavelength range of 300 nm to 800 nm). The samples were prepared either by thermal evaporation in high vacuum or spin-coating of thin films onto glass substrates. For determination of the optical functions of ITO, commercial ITO glass was used. Measurements at different incident angles were performed to determine whether the samples can be considered isotropic. The SE data were modeled using an oscillator model (Lorentz for semiconducting and Lorentz-Drude for conducting materials). The absorption spectra were also measured, and the comparison with the data determined by SE is given.

An efficient urea biosensor based on laser ablated ZnO thin film

2013 ◽  
Vol 1530 ◽  
Author(s):  
Neha Batra ◽  
Monika Tomar ◽  
Vinay Gupta
Keyword(s):  
Thin Film ◽  
Indium Tin Oxide ◽  
High Electron ◽  
Zno Thin Film ◽  
Detection Range ◽  
Response Characteristics ◽  
Glass Substrates ◽  
Enhanced Sensitivity ◽  
Ito Glass ◽  
The Matrix

ABSTRACTZinc oxide (ZnO) thin film deposited onto indium tin oxide (ITO) coated Corning glass substrates using pulsed laser deposition (PLD) technique has been used as a matrix for realization of an efficient urea biosensor after immobilization of urease (Urs) enzyme onto the surface of ZnO. The bioelectrode (Urs/ZnO/ITO/glass) is found to be exhibiting an enhanced sensitivity of 22μΑmΜ−1cm−2 towards urea over a wide detection range of 5-200 mg/dl. The relatively low value of Michaelis menten constant (Km= 0.94mM) indicates high affinity of the immobilized urease towards the analyte (urea). The prepared biosensor retains 90% of its activity for more than 10 weeks. The observed enhanced response characteristics of bioelectrode are attributed to the growth of the matrix (highly c-axis oriented ZnO thin film) with desired surface morphology and high electron communication feature. The results confirm the promising application of PLD grown ZnO thin film as an efficient matrix for urea detection.

scholarly journals Preparation of vertically aligned ZnO crystal rods in aqueous solution at external electric field

2014 ◽  
Vol 32 (2) ◽  
pp. 157-163 ◽  
Author(s):  
B. Prijamboedi ◽  
E. Maryanti ◽  
T. Haryati
Keyword(s):  
Aqueous Solution ◽  
Electric Field ◽  
External Electric Field ◽  
Indium Tin Oxide ◽  
Room Temperature ◽  
Negative Electrode ◽  
Glass Substrates ◽  
Ito Glass ◽  
Vertically Aligned ◽  
Zno Crystal

AbstractIn this study, an external electric field was used to facilitate the growth of vertically aligned ZnO crystal rods on the surface of indium tin oxide (ITO) glass substrates in an aqueous solution. We used Zn(NO3) and C6H12N4 as precursor and reagent. We found that the external electric field generated by DC potential of 5 kV between two electrodes that were placed outside the bottle could facilitate the growth of homogeneous, high density and vertically aligned ZnO crystal rods. Position of the substrate during the growth of crystal was found to be important to obtain well aligned crystal. The crystals that were grown near the negative electrode had the best properties. Photoluminescence measurement at room temperature revealed sharp peaks at around 360 and 380 nm and a broad peak around 420 nm that indicated good properties of ZnO crystals grown with external electric field.

Different Photoresponses for Positive and Negative Biases of CuPc/C60 Heterojunction Nanostructures

2015 ◽  
Vol 1103 ◽  
pp. 61-68 ◽  
Author(s):  
Theerasak Juagwon ◽  
Kittitat Subannajui ◽  
Tanakorn Osotchan
Keyword(s):  
Indium Tin Oxide ◽  
Copper Phthalocyanine ◽  
Monochromatic Light ◽  
Positive Bias ◽  
Response Characteristics ◽  
Glass Substrates ◽  
Double Peaks ◽  
Ito Glass ◽  
Current Characteristics ◽  
Response Current

Photoresponse characteristic from efficient exciton dissociated heterojunction based on copper phthalocyanine (CuPc) and fullerene (C60) layers was observed the different spectrum responses under positive and negative biases. The nanostructures of CuPc and C60 thin films were fabricated between transparent indium tin oxide (ITO) and aluminum (Al) electrodes. The 100 nm thick of CuPc and C60 layers were deposited on patterned ITO glass substrates by thermal evaporation with quartz thickness monitor. Photoresponses of the fabricated devices were investigated by current measuring as a function of wavelength in range of 400 to 700 nm. Measured current in Al/C60/CuPc/ITO structure when applied negative voltage to ITO electrode is higher than that of positive voltage case. Under monochromatic light, the photoresponse characteristic of Al/C60/CuPc/ITO structure under negative bias shows dominate response current peak at around 450 nm and double peaks in range of 500-700 nm originated from C60 and CuPc layers, respectively. These two response characteristics can be described by the combination of responses from Al/C60/ITO and Al/CuPc/ITO structures. The response current characteristics of Al/C60/ITO and Al/CuPc/ITO structures also agree with the optical absorptions of C60 and CuPc layers, respectively. By applying positive bias to Al/C60/CuPc/ITO structure, the photoresponse characteristic has only one peak at about 450 nm that is similar to the response in Al/C60/ITO structure only. This indicates that under positive bias, the photocurrent only from C60 layer can be observed.

Controlled Fabrication of the CdS Nanocrystals Films and its Application in Hybrid Solar Cells

2013 ◽  
Vol 742 ◽  
pp. 139-142
Author(s):  
Wei Wei He ◽  
Hui Min Jia ◽  
Yan Lei
Keyword(s):  
Indium Tin Oxide ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Glass Substrates ◽  
Cds Nanocrystals ◽  
Ito Glass ◽  
One Step ◽  
Cds Film

In this paper, we fabricated the CdS nanocrystals film on indium-tin oxide (ITO) glass substrates through one-step solvothermal treatment of cadmium nanocrystals layer and sulfur powder in the presence of absolute ethanol. And then we spin-coated a poly (3-hexylthiophene) (P3HT) layer in the CdS film, and finally evaporated an Au electrode through a shadow mask. The resulting products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscope (AFM). A photovoltaic performance measurement of the fabricated device (ITO/CdS:P3HT/Au) shows a short circuit current density (Jsc) of 0.82 mA cm2, and a power conversion efficiency (η) of 0.03% under an illumination of 100 mW/cm2.

Comparison of processing parameter effects during magnetron sputtering and electrochemical anodization of TiO2 nanotubes on ITO/glass and glass substrates

2021 ◽  
Vol 63 (3) ◽  
pp. 245-252
Author(s):  
Emine Başalan ◽  
Mustafa Erol ◽  
Orkut Sancakoğlu ◽  
Tuncay Dikici ◽  
Erdal Çelik
Keyword(s):  
Magnetron Sputtering ◽  
Crystalline Structure ◽  
Indium Tin Oxide ◽  
Rf Magnetron Sputtering ◽  
Electrochemical Anodization ◽  
Processing Parameter ◽  
Crystalline Structures ◽  
Glass Substrates ◽  
Texture Coefficients ◽  
Ito Glass

Abstract Titanium thin films were deposited on glass and indium tin oxide (ITO) coated glass substrates by radio-frequency (RF) magnetron sputtering under varying sputtering parameters as: power, pressure, substrate temperature and target-substrate distance. The crystalline structure, crystallite size and texture coefficients of the films were evaluated in detail. As the evaluation points out, 100 W, 1.33 Pa ambient temperature and 70 mm were determined as the optimum sputtering parameters for intended crystalline structures. Subsequently, electrochemical anodization experiments were performed via varied electrolytes and under various anodization parameters (voltage, time and electrolyte type) in a two-electrode electrochemical cell using the films obtained through the optimized sputtering parameters. The anodized samples were annealed at 450 °C for 1 h in air in order to obtain anatase transformation and the desired crystalline structure. The surface morphologies and the crystalline structures of the anodized films were evaluated through x-ray diffractometer (XRD) and scanning electron microscope (SEM), respectively. Finally, the anodization parameters for the formation of TiO2 nanotube arrays were determined as: 35 V and 35 min. in an electrolyte composed of 0.3 wt.-% NH4F – 2 wt.-% water – ethylene glycol.

Room Temperature Laser Deposited Indium Tin Oxide Films for Display Applications

1994 ◽  
Vol 345 ◽  
Author(s):  
W. C. Yip ◽  
A. Gururaj Bhat ◽  
H. S. Kwok
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Room Temperature ◽  
Transparent Electrode ◽  
Thermally Induced ◽  
Strong Current ◽  
Electro Optic ◽  
Ito Glass ◽  
Ito Thin Films ◽  
Display Technology

AbstractIndium tin oxide is the most basic transparent electrode material for all flat panel displays. Commercial ITO glass is manufactured mostly by sputtering. Here, we report the use of pulsed laser deposition to produce ITO thin films on glass at room temperature. Several interesting properties of such films were observed. (1) It was found that the resistivity of 0.5mΩ-cm compared very well with the best published values produced at high deposition temperatures. Room temperature deposition affords the possibility of using plastics and other flexible substrates for displays. (2) The microstructure of these ITO films were quite different from those of commercial ITO glasses. (3) By passing a strong current through the film, a large thermally induced Δnl could be observed. This change was due to lateral stress and could be as large as 1μ m for a 1-μm thick film. An electro-optic shutter can easily be designed with such films. Applications of this electronically controlled Δnl to display technology are discussed.

PH SENSITIVITY DEPENDENCY ON THE ANNEALING TEMPERATURE OF SPIN-COATED TITANIUM DIOXIDE THIN FILMS

2016 ◽  
Vol 78 (5-8) ◽  
Author(s):  
Khairul Aimi Yusof ◽  
Rohanieza Abdul Rahman ◽  
Muhammad AlHadi Zulkefle ◽  
Sukreen Hana Herman ◽  
Wan Fazlida Hanim Abdullah
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Titanium Dioxide ◽  
Indium Tin Oxide ◽  
Ph Sensor ◽  
Tio2 Thin Films ◽  
Glass Substrates ◽  
Ito Glass ◽  
Ito Thin Films ◽  
Sensing Membrane

Titanium dioxide (TiO2) thin films were fabricated on indium tin oxide (ITO) glass substrates using the spin coating technique and further were implemented as sensing membranes of the extended gate field effect transistor (EGFET) based pH sensor. The as-deposited thin films were annealed at different temperatures from 200 - 600 °C in room ambient for 20 min. The effects of different annealing temperatures on electrical and crystalline properties were analyzed by I-V two point probes measurement and X-ray diffraction respectively. Meanwhile, the surface morphology of thin films was observed by field emission scanning electron microscope (FESEM). We then measured the transfer characteristics (ID-VG) of the TiO2/ITO sensing membrane using a semiconductor parametric device analyzer for sensor characterization. It was found that, TiO2/ITO sensing membrane annealed at 300 °C achieved higher sensitivity and good linearity of 51.48 mV/pH and 0.99415, respectively in the pH buffer solutions of 4, 7, 10, and 12. Thin film annealed at 300 °C gives higher conductivity thin film of 384.62 S/m. We found that the conductivity of TiO2/ITO thin films was proportional with the sensitivity of sensing membrane.  

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