scholarly journals ITO/Poly(Aniline)/Sol-Gel Glass: An Optically Transparent, pH-Responsive Substrate for Supported Lipid Bilayers

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ahmed Al-Obeidi ◽  
Chenhao Ge ◽  
Kristina S. Orosz ◽  
S. Scott Saavedra
Keyword(s):  
Lipid Bilayers ◽  
Indium Tin Oxide ◽  
Sol Gel ◽  
Pani Film ◽  
Ph Response ◽  
Ito Electrode ◽  
Gel Layer ◽  
Optically Transparent ◽  
Lipid Diffusion ◽  
Poly Aniline

Described here is fabrication of a pH-sensitive, optically transparent transducer composed of a planar indium-tin oxide (ITO) electrode overcoated with a poly(aniline) (PANI) thin film and a porous sol-gel layer. Adsorption of the PANI film renders the ITO electrode sensitive to pH, whereas the sol-gel spin-coated layer makes the upper surface compatible with fusion of phospholipid vesicles to form a planar supported lipid bilayer (PSLB). The response to changes in the pH of the buffer contacting the sol-gel/PANI/ITO electrode is pseudo-Nernstian with a slope of 52 mV/pH over a pH range of 4–9. Vesicle fusion forms a laterally continuous PSLB on the upper sol-gel surface that is fluid with a lateral lipid diffusion coefficient of 2.2 μm2/s measured by fluorescence recovery after photobleaching. Due to its lateral continuity and lack of defects, the PSLB blocks the pH response of the underlying electrode to changes in the pH of the overlying buffer. This architecture is simpler to fabricate than previously reported ITO electrodes derivatized for PSLB formation and should be useful for optical monitoring of proton transport across supported membranes derivatized with ionophores and ion channels.

scholarly journals A Molecularly Imprinted Sol-Gel Electrochemical Sensor for Naloxone Determination

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 631
Author(s):  
Narges Shaabani ◽  
Nora W. C. Chan ◽  
Abebaw B. Jemere
Keyword(s):  
Indium Tin Oxide ◽  
Sol Gel ◽  
Electrochemical Techniques ◽  
Electrochemical Determination ◽  
Multiwall Carbon Nanotube ◽  
Molecularly Imprinted ◽  
Gel Layer ◽  
Sensing Material ◽  
Relative Standard ◽  
Optimized Conditions

A molecularly imprinted sol-gel is reported for selective and sensitive electrochemical determination of the drug naloxone (NLX). The sensor was developed by combining molecular imprinting and sol-gel techniques and electrochemically grafting the sol solution onto a functionalized multiwall carbon nanotube modified indium-tin oxide (ITO) electrode. The sol-gel layer was obtained from acid catalyzed hydrolysis and condensation of a solution composed of triethoxyphenylsilane (TEPS) and tetraethoxysilane (TES). The fabrication, structure and properties of the sensing material were characterized via scanning electron microscopy, spectroscopy and electrochemical techniques. Parameters affecting the sensor’s performance were evaluated and optimized. A sensor fabricated under the optimized conditions responded linearly between 0.0 µM and 12 µM NLX, with a detection limit of 0.02 µM. The sensor also showed good run-to-run repeatability and batch-to-batch performance reproducibility with relative standard deviations (RSD) of 2.5–7.8% (n = 3) and 9.2% (n = 4), respectively. The developed sensor displayed excellent selectivity towards NLX compared to structurally similar compounds (codeine, fentanyl, naltrexone and noroxymorphone), and was successfully used to measure NLX in synthetic urine samples yielding recoveries greater than 88%.

Enhanced open circuit voltage in photovoltaic effect of polycrystalline La and Ni co-doped BiFeO3 film

2015 ◽  
Vol 08 (01) ◽  
pp. 1550002 ◽  
Author(s):  
Zeng-Wei Peng ◽  
Ying-Long Wang ◽  
Bao-Ting Liu
Keyword(s):  
Indium Tin Oxide ◽  
Open Circuit Voltage ◽  
Photovoltaic Effect ◽  
Strong Dependence ◽  
Sol Gel ◽  
Open Circuit ◽  
Pt Electrode ◽  
Barrier Heights ◽  
Ito Electrode ◽  
Bifeo3 Film

Photovoltaic (PV) effect of polycrystalline Bi 0.975 La 0.025 Fe 0.975 Ni 0.025 O 3 (BLFNO) film grown on Pt (111)/ Ti/SiO 2/ Si (001) substrate using sol–gel method has been investigated. The BLFNO film possesses good ferroelectric property and large twice-remanent polarization. It is found that PV response exhibited a strong dependence on the potential of top indium tin oxide (ITO) and bottom Pt electrode. The open circuit voltage is -0.67 V when the potential of ITO electrode is higher than that of Pt electrode and 0.45 V when the potential of ITO electrode is lower than that of Pt electrode. This can be interpreted by the variation of barrier heights at both ITO/BLFNO and BLFNO/ Pt interfaces.

scholarly journals Poly(aniline) Nanowires in Sol–Gel Coated ITO: A pH-Responsive Substrate for Planar Supported Lipid Bilayers

2011 ◽  
Vol 3 (7) ◽  
pp. 2677-2685 ◽  
Author(s):  
Chenhao Ge ◽  
Kristina S. Orosz ◽  
Neal R. Armstrong ◽  
S. Scott Saavedra
Keyword(s):  
Lipid Bilayers ◽  
Sol Gel ◽  
Supported Lipid Bilayers ◽  
Ph Responsive ◽  
Poly Aniline

Electrochemical Immunosensor for Carcinoembryonic Antigen Detection Based on Mo–Mn3O4/MWCNTs/Chits Nanocomposite Modified ITO Electrode

NANO ◽  
2015 ◽  
Vol 10 (08) ◽  
pp. 1550111 ◽  
Author(s):  
Wen-Ting Li ◽  
Yu Wang ◽  
Fen-Fang Deng ◽  
Li-Li Liu ◽  
Hai-Jun Nan ◽  
...  
Keyword(s):  
Carcinoembryonic Antigen ◽  
Indium Tin Oxide ◽  
Incubation Temperature ◽  
Sol Gel ◽  
High Sensitivity ◽  
Electrochemical Immunosensor ◽  
Ito Electrode ◽  
Potential Applications ◽  
Recognition Systems

A novel electrochemical immunosensor for determination of carcinoembryonic antigen (CEA) in human serum was fabricated by depositing Mo–Mn3O4/MWCNTs/Chits nanocomposite onto an indium-tin oxide (ITO) electrode. Mo-doped Mn3O4 (MMO) was synthesized by sol–gel method and the presence of molybdenum improved its electrochemical properties. The MMO/MWCNTs/Chits nanocomposite could accelerate the electron transfer rate and enlarge the surface area to capture a large number of Carcinoembryonic Antigen (CEA). The factors influencing the performance of the immunosensor were investigated, such as incubation time, incubation temperature and pH. Under optimal conditions, the electrochemical immunosensor could detect CEA in a linear range from 0.1[Formula: see text]ng[Formula: see text][Formula: see text][Formula: see text]mL[Formula: see text] to 125[Formula: see text]ng[Formula: see text][Formula: see text][Formula: see text]mL[Formula: see text] with a detection limit of 4.9[Formula: see text]pg[Formula: see text][Formula: see text][Formula: see text]mL[Formula: see text] ([Formula: see text][Formula: see text]). In addition, it exhibited high sensitivity and acceptable stability on a promising immobilization platform for signal amplification, which could be extended to other labeled recognition systems. This electrochemical immunosensor may provide potential applications for the clinical diagnosis.

Influence of Brain Gangliosides on the Formation and Properties of Supported Lipid Bilayers for Binding Kinetics Studies

2018 ◽  
Author(s):  
Luke Jordan ◽  
Nathan Wittenberg
Keyword(s):  
Lipid Bilayers ◽  
Binding Kinetics ◽  
Supported Lipid Bilayers ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Supported Lipid Bilayer ◽  
Head Groups ◽  
Lipid Diffusion ◽  
Kinetics Of ◽  
Brain Gangliosides

This is a comprehensive study of the effects of the four major brain gangliosides (GM1, GD1b, GD1a, and GT1b) on the adsorption and rupture of phospholipid vesicles on SiO2 surfaces for the formation of supported lipid bilayer (SLB) membranes. Using quartz crystal microbalance with dissipation monitoring (QCM-D) we show that gangliosides GD1a and GT1b significantly slow the SLB formation process, whereas GM1 and GD1b have smaller effects. This is likely due to the net ganglioside charge as well as the positions of acidic sugar groups on ganglioside glycan head groups. Data is included that shows calcium can accelerate the formation of ganglioside-rich SLBs. Using fluorescence recovery after photobleaching (FRAP) we also show that the presence of gangliosides significantly reduces lipid diffusion coefficients in SLBs in a concentration-dependent manner. Finally, using QCM-D and GD1a-rich SLB membranes we measure the binding kinetics of an anti-GD1a antibody that has similarities to a monoclonal antibody that is a hallmark of a variant of Guillain-Barre syndrome.

scholarly journals Ferromagnetism in transparent Mn(II)-doped indium tin oxide films prepared by sol–gel coating

2009 ◽  
Vol 469 (4-6) ◽  
pp. 313-317 ◽  
Author(s):  
Susmita Kundu ◽  
Dipten Bhattacharya ◽  
Jiten Ghosh ◽  
Pintu Das ◽  
Prasanta K. Biswas
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Sol Gel ◽  
Oxide Films ◽  
Tin Oxide Films

scholarly journals Performance of GaN-Based LEDs with Nanopatterned Indium Tin Oxide Electrode

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Zhanxu Chen ◽  
Wenjie Liu ◽  
Wei Wan ◽  
Gengyan Chen ◽  
Yongzhu Chen ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Ohmic Contacts ◽  
Three Dimensional ◽  
Light Output ◽  
Light Extraction Efficiency ◽  
Experimental Result ◽  
Indium Tin Oxide Electrode ◽  
Light Emitting ◽  
Ito Electrode

The indium tin oxide (ITO) has been widely applied in light emitting diodes (LEDs) as the transparent current spreading layer. In this work, the performance of GaN-based blue light LEDs with nanopatterned ITO electrode is investigated. Periodic nanopillar ITO arrays are fabricated by inductive coupled plasma etching with the mask of polystyrene nanosphere. The light extraction efficiency (LEE) of LEDs can be improved by nanopatterned ITO ohmic contacts. The light output intensity of the fabricated LEDs with nanopatterned ITO electrode is 17% higher than that of the conventional LEDs at an injection current of 100 mA. Three-dimensional finite difference time domain simulation matches well with the experimental result. This method may serve as a practical approach to improving the LEE of the LEDs.

ITO Thin Films on Silicon Buffer by Sol Gel Method

2006 ◽  
Vol 514-516 ◽  
pp. 1155-1160 ◽  
Author(s):  
Talaat Moussa Hammad
Keyword(s):  
Thin Films ◽  
Indium Tin Oxide ◽  
Optical Transmission ◽  
Sol Gel ◽  
Precursor Solution ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ito Thin Films ◽  
Uv Visible

Sol gel indium tin oxide thin films (In: Sn = 90:10) were prepared by the sol-gel dipcoating process on silicon buffer substrate. The precursor solution was prepared by mixing SnCl2.2H2O and InCl3 dissolved in ethanol and acetic acid. The crystalline structure and grain orientation of ITO films were determined by X-ray diffraction. The surface morphology of the films was characterized by scanning electron microscope (SEM). Optical transmission and reflectance spectra of the films were analyzed by using a UV-visible spectrophotometer. The transport properties of majority charge carriers for these films were studied by Hall measurement. ITO thin film with electrical resistivity of 7.6 ×10-3 3.cm, Hall mobility of approximately 2 cm2(Vs)-1 and free carrier concentration of approximately 4.2 ×1020 cm-3 are obtained for films 100 nm thick films. The I-V curve measurement showed typical I-V characteristic behavior of sol gel ITO thin films.

Effect of coating composition on the anticorrosion performance of a silane sol–gel layer on mild steel

RSC Advances ◽  
2015 ◽  
Vol 5 (129) ◽  
pp. 106485-106491 ◽  
Author(s):  
A. Foroozan E. ◽  
R. Naderi
Keyword(s):  
Mild Steel ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Sol Gel ◽  
Gel Layer ◽  
Gel Film ◽  
Coating Composition ◽  
Anticorrosion Performance ◽  
Protective Performance ◽  
Mild Steel Substrate

In this study, the effect of coating composition on the protective performance of an eco-friendly silane sol–gel film applied on a mild steel substrate was investigated using electrochemical impedance spectroscopy and surface analysis methods.

Aqueous sol-gel routes to conducting films of indium oxide and indium-tin-oxide

2000 ◽  
Author(s):  
Carole C. Perry ◽  
J. K. McGiveron ◽  
Philip G. Harrison
Keyword(s):  
Indium Oxide ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Sol Gel
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