Effect of Concentration and pH of PBS to the Electrocatalytic Performance of Enzymatic Glucose Biosensor

2019 ◽  
Vol 290 ◽  
pp. 193-198
Author(s):  
Mohamad Nor Noorhashimah ◽  
Abdul Razak Khairunisak ◽  
Zainovia Lockman
Keyword(s):  
Modified Electrode ◽  
Indium Tin Oxide ◽  
Glucose Sensor ◽  
Glucose Biosensor ◽  
Glass Electrode ◽  
Ion Concentration ◽  
Glucose Detection ◽  
Buffer Solution ◽  
Electrocatalytic Performance ◽  
Ito Glass

Phosphate buffer saline (PBS) is commonly applied as an electrolyte for glucose sensor application because ion concentration and osmolality of PBS are similar to the human body. Therefore, it is important to study the effect of concentration and pH of PBS to the electrocatalytic performance of the modified electrode in glucose detection. In this study, the modification of indium tin oxide (ITO) glass electrode by utilizing iron oxide nanoparticles (IONP) coated with citric acid (CA), glucose oxidase (GOx) enzyme and Nafion layer (Nafion/Gox/IONP-CA/ITO) were performed. IONP was prepared by using the precipitation technique through formation of colloidal stable IONP in water at physiological pH. The size of IONP-CA precipitates was ~19 nm with maghemite (γ-Fe2O3) phase characterized using transmission electron microscopy (TEM) and X-ray diffraction (XRD), respectively. Increasing the PBS concentration increased the electrocatalytic performance of the bioelectrode whereas pH of PBS buffer solution affected the GOx bioactivity. The modified electrode Nafion/Gox/IONP-CA/ITO displayed good electrochemical and electrocatalytic performance in glucose detection.

scholarly journals Electrical stimulation of cultured neurons using a simply patterned indium-tin-oxide (ITO) glass electrode

2015 ◽  
Vol 253 ◽  
pp. 272-278 ◽  
Author(s):  
Ryo Tanamoto ◽  
Yutaka Shindo ◽  
Norihisa Miki ◽  
Yoshinori Matsumoto ◽  
Kohji Hotta ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Glass Electrode ◽  
Cultured Neurons ◽  
Ito Glass ◽  
Stimulation Of

Metal-Modulated Growth of Au Nanoparticles by Electropolymerized 8-Hydroxyquinoline Films

2012 ◽  
Vol 503-504 ◽  
pp. 334-337
Author(s):  
Hong Cheng Pan ◽  
Wei Hong Liu ◽  
Xue Peng Li ◽  
Yan Bin Ren ◽  
Shan Hu Liu
Keyword(s):  
Indium Tin Oxide ◽  
Au Nanoparticles ◽  
Phosphate Buffer Solution ◽  
Differential Pulse ◽  
Au Nanoparticle ◽  
Buffer Solution ◽  
Ito Electrode ◽  
Glass Slides ◽  
Ito Glass ◽  
Pulse Voltammetry

8-hydroxyquinoline (8-Hq) films were electropolymerized on indium-tin-oxide-coated (ITO) glass slides by using cyclic voltammetry. The 8-Hq electropolymerized on ITO electrode (8-Hq/ITO) was immersed in a 5-mL solution containing 0.01 M phosphate buffer solution (PBS, pH 7.0), 0.8 mM cetyltrimethylammonium chloride, 20 µL of HAuCl4 (1%, w/w), and 50 µL of Au nanoparticle seeds. The mixture was incubated at 57oC for 3 h. Then Au nanoparticles were grown and deposited onto the 8-Hq/ITO electrode. It was found that some metal ions (Zn2+, Cd2+, Mg2+, and Pb2+) could inhibit the growth of Au nanoparticles. The metal-modulated growth of Au nanoparticles was studied by UV-vis spectra and differential pulse voltammetry.

Hierarchical Au nanoclusters electrodeposited on amine-terminated ITO glass as a SERS-active substrate for the reliable and sensitive detection of serotonin in a Tris-HCl buffer solution

2019 ◽  
Vol 48 (42) ◽  
pp. 16026-16033 ◽  
Author(s):  
Viet-Duc Phung ◽  
Jeong-Keun Kook ◽  
Do Yeung Koh ◽  
Sang-Wha Lee
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Oxide Glass ◽  
Raman Signal ◽  
Buffer Solution ◽  
Au Nanoclusters ◽  
Ito Glass ◽  
Active Substrate ◽  
Indium Tin Oxide Glass ◽  
Sers Active Substrate

In this study, a SERS-active substrate was fabricated by electrodepositing hierarchical Au nanostructures on amine-terminated ITO (indium tin oxide) glass to achieve an enhanced Raman signal of 5-HT.

scholarly journals Switchable window based on electrochromic polymers

2004 ◽  
Vol 19 (7) ◽  
pp. 2072-2080 ◽  
Author(s):  
Chunye Xu ◽  
Lu Liu ◽  
Susan E. Legenski ◽  
Dai Ning ◽  
Minoru Taya
Keyword(s):  
Polymer Film ◽  
Indium Tin Oxide ◽  
Layer Structure ◽  
Contrast Ratio ◽  
Window Size ◽  
Glass Electrode ◽  
Polymer Gel ◽  
Switching Speed ◽  
Ito Glass ◽  
Main Components

A large contrast ratio (>ΔΤ = 60%) and rapid switching (0.3–1 s) electrochromic (EC) polymer device that consists of a laminated two-layer structure between two electrodes was prepared. The new design consists of an indium tin oxide (ITO) glass electrode, a cathodic EC polymer film, a solid electrolyte, and a counterelectrode that replaces the anodic EC polymer and ITO electrode. Four EC polymers including two new EC polymers, Poly[3-methyl-3′-propyl-3,4-dihydro-2H-thieno(3,4-b)(1,4)dioxepine] (PProDOT-MePro) and Poly[3,3-diethyl-3,4-dihydro-2H,7H-(1,4)dioxepino(2,3-c)pyrrole] (PProDOP-Et2), were synthesized as cathodic EC polymers. A carbon-based counterelectrode was prepared for comparison with an Au-based counterelectrode. Several kinds of polymer gel electrolytes were prepared for comparison. The devices (windows) were increased in area from 0.028 × 0.04 in.2, 1 × 1 in.2 to 3 × 3 in.2 Three main components, the EC polymer film, the gel electrolyte, and the counterelectrode, were studied and their optical properties, conductivities, and repeatabilities were compared. The effects of window size on the contrast ratio, switching speed, power usage, and repeatability were studied.

Templating synthesis of hollow CuO polyhedron and its application for nonenzymatic glucose detection

2014 ◽  
Vol 2 (20) ◽  
pp. 7306-7312 ◽  
Author(s):  
Chuncai Kong ◽  
Linli Tang ◽  
Xiaozhe Zhang ◽  
Shaodong Sun ◽  
Shengchun Yang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Modified Electrode ◽  
Glucose Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Good Stability ◽  
Glucose Detection ◽  
Nonenzymatic Glucose Sensor ◽  
Oxidation Of Glucose ◽  
Templating Synthesis

In this paper, we successfully fabricated a novel type of a hollow CuO polyhedron that consists of numerous nanoplates using Cu2O as a template. The hollow CuO polyhedron-modified electrode exhibits high sensitivity, low detection limit, good stability and fast response towards the oxidation of glucose, suggesting it to be a promising nonenzymatic glucose sensor.

A sensitive and selective enzyme-free amperometric glucose biosensor using a composite from multi-walled carbon nanotubes and cobalt phthalocyanine

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 26762-26768 ◽  
Author(s):  
Rajkumar Devasenathipathy ◽  
Chelladurai Karuppiah ◽  
Shen-Ming Chen ◽  
Selvakumar Palanisamy ◽  
Bih-Show Lou ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Modified Electrode ◽  
Glucose Sensor ◽  
Glucose Biosensor ◽  
Cobalt Phthalocyanine ◽  
Multiwalled Carbon ◽  
Multi Walled Carbon Nanotubes ◽  
Free Glucose ◽  
Walled Carbon Nanotubes

In the present study, a simple and sensitive amperometric enzyme-free glucose sensor was developed at a multiwalled carbon nanotube and cobalt phthalocyanine (MWCNT–CoTsPc) modified electrode.

scholarly journals Black Phosphorus-Molybdenum Disulfide Hetero-Junctions Formed with Ink-Jet Printing for Potential Solar Cell Applications with Indium-Tin-Oxide

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 560
Author(s):  
Ravindra Ketan Mehta ◽  
Anupama Bhat Kaul
Keyword(s):  
Electrical Properties ◽  
Molybdenum Disulfide ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Cost Effective ◽  
Contact Materials ◽  
Ito Glass ◽  
The Future ◽  
Potential Applications ◽  
Jet Printing

In this work, we implemented liquid exfoliation to inkjet-print two-dimensional (2D) black phosphorous (BP) and molybdenum disulfide (MoS2) p–n heterojunctions on a standard indium tin oxide (ITO) glass substrate in a vertical architecture. We also compared the optical and electrical properties of the inkjet-printed BP layer with that of the MoS2 and the electrical properties of the mechanically exfoliated MoS2 with that of the inkjet-printed MoS2. We found significant differences in the optical characteristics of the inkjet-printed BP and MoS2 layers attributed to the differences in their underlying crystal structure. The newly demonstrated liquid exfoliated and inkjet-printed BP–MoS2 2D p–n junction was also compared with previous reports where mechanically exfoliated BP–MoS2 2D p–n junction were used. The electronic transport properties of mechanically exfoliated MoS2 membranes are typically better compared to inkjet-printed structures but inkjet printing offers a cost-effective and quicker way to fabricate heterostructures easily. In the future, the performance of inkjet-printed structures can be further improved by employing suitable contact materials, amongst other factors such as modifying the solvent chemistries. The architecture reported in this work has potential applications towards building solar cells with solution processed 2D materials in the future.

Fabrication of Micro-OLEDs by Room-temperature Curing Nanocontact-print Lithography Using DLC Molds

2012 ◽  
Vol 1511 ◽  
Author(s):  
Ippei Ishikawa ◽  
Keisuke Sakurai ◽  
Shuji Kiyohara ◽  
Taisuke Okuno ◽  
Hideto Tanoue ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Nanoimprint Lithography ◽  
Room Temperature ◽  
Hole Transport ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Insulating Layer ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Ito Glass

ABSTRACTThe microfabrication technologiesfor organic light-emitting devices (OLEDs) are essential to the fabrication of the next generation of light-emitting devices. The micro-OLEDs fabricated by room-temperature curing nanoimprint lithography (RTC-NIL) using diamond molds have been investigated. However, light emissions from 10 μm-square-dot OLEDs fabricated by the RTC-NIL method have not been uniform. Therefore, we proposed the fabrication of micro-OLEDs by room-temperature curing nanocontact-print lithography (RTC-NCL) using the diamond-like carbon (DLC) mold. The DLC molds used in RTC-NCL were fabricated by an electron cyclotron resonance (ECR) oxygen ion shower with polysiloxane oxide mask in electron beam (EB) lithography technology. The mold patterns are square and rectangle dots which has 10 µm-width, 10 µm-width and50 µm-length, respectively. The height of the patterns is 500 nm. The DLC molds were used to form the insulating layer of polysiloxane in RTC-NCL. We carried out the RTC-NCL process using the DLC mold under the following optimum conditions: 0.1 MPa-pressure for coating DLC mold with polysiloxane film, 2.1 MPa-pressure for transferring polysiloxane from DLC mold pattern to indium tin oxide (ITO) glass substrate. We deposited N, N'-Diphenyl -N, N'-di (m-tolyl)benzidine (TPD) [40 nm-thickness] as hole transport layer / Tris(8-quinolinolato)aluminum (Alq3) [40 nm-thickness] as electron transport layer / Al [200 nm-thickness] as cathode on ITO glass substrateas anode in this order. We succeeded in formation of the insulating layer with square and rectangle dots which has 10 µm-width,10 µm-width and 50 µm-length, and operation of micro-OLEDs by RTC-NIL using DLC molds.

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