scholarly journals Manufacturing Process of Polymeric Microneedle Sensors for Mass Production

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1364
Author(s):  
Jae Yun Baek ◽  
Kyung Mook Kang ◽  
Hyeong Jun Kim ◽  
Ju Hyeon Kim ◽  
Ju Hwan Lee ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Detection ◽  
Mass Production ◽  
Interstitial Fluid ◽  
Linear Sweep Voltammetry ◽  
Sensor Surface ◽  
Linear Sweep ◽  
Thermal Compression ◽  
Stencil Mask ◽  
Sensor Fabrication

In this work, we present a fabrication process for microneedle sensors made of polylactic acid (PLA), which can be utilized for the electrochemical detection of various biomarkers in interstitial fluid. Microneedles were fabricated by the thermal compression molding of PLA into a laser machined polytetrafluoroethylene (PTFE) mold. Sensor fabrication was completed by forming working, counter, and reference electrodes on each sensor surface by Au sputtering through a stencil mask, followed by laser dicing to separate individual sensors from the substrate. The devised series of processes was designed to be suitable for mass production, where multiple microneedle sensors can be produced at once on a 4-inch wafer. The operational stability of the fabricated sensors was confirmed by linear sweep voltammetry and cyclic voltammetry at the range of working potentials of various biochemical molecules in interstitial fluid.

scholarly journals Electrode Mechanism Analysis by Linear Sweep Voltammetry. II. Application of Derivative Cyclic Voltammetry.

1981 ◽  
Vol 35b ◽  
pp. 117-121 ◽  
Author(s):  
Elisabet Ahlberg ◽  
Vernon D. Parker ◽  
Klaus Mosbach ◽  
Gian Maria Pacifici ◽  
Anders Rane
Keyword(s):  
Cyclic Voltammetry ◽  
Linear Sweep Voltammetry ◽  
Mechanism Analysis ◽  
Linear Sweep

The Effect of Boric Acid Addition on the Performance of a Gelled Electrolyte

2013 ◽  
Vol 712-715 ◽  
pp. 321-324
Author(s):  
Dong Liang Lu ◽  
Dang Jun Zhang ◽  
Chun Yan Duan ◽  
Tao Lin
Keyword(s):  
Cyclic Voltammetry ◽  
Electron Microscope ◽  
Boric Acid ◽  
Electrical Resistance ◽  
Corrosion Test ◽  
Electrochemical Impedance ◽  
Linear Sweep Voltammetry ◽  
Linear Sweep ◽  
Equivalent Circuit Analysis ◽  
Scanning Electron

The aim of this study is to evaluate the effect of boric acid as an additive for gelled electrolytes. Cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and an equivalent circuit analysis were employed to study the electrochemical performance of the gelled electrolyte with the addition of varying amounts of boric acid. Scanning electron microscope (SEM) was employed to observe the grid corrosion in corrosion test. For moderate contents of boric acid, the electrode capacity improved, as well as the oxygen evolution profermance. However, the adverse effects of boric acid were found to include increased electrical resistance, decreased hydrogen evolution overpotential and promote the corrosion of the grid. The experimental results indicates that the optimum content was 0.4wt.%.

scholarly journals A Screen-Printed Electrode Modified With Graphene/Co3O4 Nanocomposite for Electrochemical Detection of Tramadol

2020 ◽  
Vol 8 ◽  
Author(s):  
Mohammad Reza Aflatoonian ◽  
Somayeh Tajik ◽  
Behnaz Aflatoonian ◽  
Hadi Beitollahi ◽  
Kaiqiang Zhang ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Linear Sweep Voltammetry ◽  
Differential Pulse ◽  
Linear Sweep ◽  
Screen Printed Electrode ◽  
Pulse Voltammetry ◽  
Phosphate Buffered Saline ◽  
Urine Specimens ◽  
Screen Printed

In this paper, graphene (Gr)/Co3O4 nanocomposite was synthesized and utilized for the development of a novel electrochemical sensor to detect tramadol. Tramadol determination was examined by linear sweep voltammetry, differential pulse voltammetry, cyclic voltammetry, and chronoamperometry on Gr/Co3O4 nanocomposite-modified screen-printed electrode (Gr/Co3O4/SPE) in phosphate-buffered saline (PBS). Under the optimized condition, the detection limit of tramadol is 0.03 μM (S/N = 3) in the linear ranges of 0.1–500.0 μM. Furthermore, Gr/Co3O4/SPE was satisfactorily utilized to detect tramadol in tramadol tablet and urine specimens.

scholarly journals CELLULOSE PHỦ NICKEL ỨNG DỤNG CHO QUÁ TRÌNH OXI HÓA ĐIỆN HÓA ETHANOL

2021 ◽  
Vol 50 (02) ◽  
Author(s):  
TRAN THAO QUYNH NGAN ◽  
PHAM HAI DINH ◽  
NGUYEN DANG NAM
Keyword(s):  
Cyclic Voltammetry ◽  
Hydrazine Hydrate ◽  
Linear Sweep Voltammetry ◽  
Viet Nam ◽  
Linear Sweep

Vật liệu cellulose và nickel (Ni/cellulose) được ứng dụng tham gia vào phản ứng xúc tác điện hóa đối với ethanol. Cellulose được tổng hợp từ phế thải của nông nghiệp như vỏ cam ở miền nam Việt Nam thông qua phương pháp thủy nhiệt trong môi trường kiềm. Nickel đã được kết tủa thành công trên bề mặt cellulose bằng cách khử hydrazine hydrate. Hình thái học, tham số mạng và trạng thái bề mặt của hỗn hợp Ni/cellulose được xác định bằng phương pháp nhiễu xạ tia X (XRD), phổ hồng ngoại biến đổi Fourier (FTIR), kính hiển vi điện tử quét (SEM). Hoạt tính điện hóa của xúc tác Ni/cellulose cũng được khảo sát bằng phương pháp quét thế vòng tuần hoàn (cyclic voltammetry - CV), quét thế tuyến tính (linear sweep voltammetry – LSV) và chronoamperometry - CA. Kết quả đặc tính cho thấy các hạt Ni kích thước nano phân bố không đồng đều trên mạch cellulose, xúc tác Ni/cellulose cho thấy hoạt tính điện hóa cao và ổn định đối với quá trình điện hóa ethanol. Mật độ dòng điện cực đại của xúc tác Ni/cellulose là gần 1.2 mA.cm-2 khi xuất hiện 0,1M ethanol trong môi trường kiềm. Kết quả cho thấy rằng vật liệu Ni/cellulose hứa hẹn sẽ đóng gớp tích cực như tiếp cận mới cho lĩnh vực xúc tác điện hóa và pin nhiên liệu ethanol.

scholarly journals Novel Aminosilane (APTES)-Grafted Polyaniline@Graphene Oxide (PANI-GO) Nanocomposite for Electrochemical Sensor

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2562
Author(s):  
Raja Saad Alruwais ◽  
Waheed A. Adeosun ◽  
Hadi M. Marwani ◽  
Mohammad Jawaid ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Chemical Method ◽  
Limit Of Detection ◽  
Anthropogenic Activities ◽  
Linear Sweep Voltammetry ◽  
Toxic Element ◽  
Current Response ◽  
Sample Analysis ◽  
Linear Sweep ◽  
Real Sample Analysis

Lead is a potentially toxic element (PTE) that has several adverse medical effects in humans. Its presence in the environment became prominent due to anthropogenic activities. The current study explores the use of newly developed composite materials (organic–inorganic hybrid) based on PANI-GO-APTES for electrochemical detection of Pb2+ in aqueous solution. The composite material (PANI-GO-APTES) was synthesized by chemical method and was characterized with SEM, XPS, XEDS, XRD, TGA, FTIR, EIS and CV. The result of characterization indicates the successful synthesis of the intended material. The PANI-GO-APTES was successfully applied for electrochemical detection of Pb2+ using cyclic voltammetry and linear sweep voltammetry method. The limit of detection of Pb2+ was 0.0053 µM in the linear range of 0.01 µM to 0.4 µM. The current response produced during the electrochemical reduction of Pb2+ catalyzed by PANI-GO-APTES was also very repeatable, reproducible and rapid. The application of PANI-GO-APTES-modified GCE in real sample analysis was also established. Therefore, PANI-GO-APTES is presented as a potential Pb2+ sensor for environmental and human health safety.

scholarly journals Evaluating the Effect of Varying the Metal Precursor in The Colloidal Synthesis of MoSe2 Nanomaterials and Their Application as Electrodes in The Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Zakhele Ndala ◽  
Ndivhuwo Shumbula ◽  
Siyabonga Nkabinde ◽  
Tshwarela Kolokoto ◽  
Obakeng Nchoe ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Impedance Spectroscopy ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Linear Sweep Voltammetry ◽  
Colloidal Synthesis ◽  
Electrochemical Surface Area ◽  
Linear Sweep ◽  
Metal Precursor ◽  
Metal Precursors

Herein we report on the use of different metal precursors in the synthesis of MoSe2 nanomaterials in order to control their morphology. The use of Mo(CO)6 as the metal precursor resulted in the formation of wrinkled few-layer nanosheets, while the use of H2MoO4 as the metal precursor resulted in the formation of nanoflowers. To investigate the effect of the morphologies on their performance as catalysts in the hydrogen evolution reaction, electrochemical characterization was done using linear sweep voltammetry, cyclic voltammetry and impedance spectroscopy. The MoSe2 nanomaterials were found to have superior electrochemical performance towards the hydrogen evolution reaction with a lower Tafel slope, on-set potential and potential at 10 mA/cm2 compared to the wrinkled few-layer nanosheets. This was found to be due to the higher effective electrochemical surface area of the nanoflowers compared to the nanosheets which suggests a higher number of exposed edge sites in the nanoflowers.

scholarly journals Electrochemical Studies of o- and p- Anisidine

2015 ◽  
Vol 3 (2) ◽  
pp. 267-271
Author(s):  
Richa Sharma ◽  
Sushma Dave
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Oxidation ◽  
Platinum Electrode ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Studies ◽  
Oxidation Peak ◽  
Cathodic Peak ◽  
Linear Sweep ◽  
And Diffusion ◽  
Sensitive Method

Electrochemical oxidation of methyl substituted aniline (anisidine) has been done on both gold and platinum electrode using cyclic voltammetry. The results were compared in different supporting electrolytes such as KCl, KNO3, H2SO4, HCl. Effect of pH was observed on electrochemical oxidation of o- & p- anisidine at gold and platinum electrode. During various scan single oxidation peak during first forward scan with no corresponding cathodic peak was obtained while a new anodic cathodic couple peak appears in subsequent scan obtained. Kinetic parameters like heterogeneous rate constant, transfer co-efficient and diffusion co-efficient were also calculated. A sensitive method was developed for estimation of micro quantities of anisidine by linear sweep voltammetry and hydrodynamic voltammetry.Int J Appl Sci Biotechnol, Vol 3(2): 267-271 DOI: http://dx.doi.org/10.3126/ijasbt.v3i2.12615 

Effect of cetyltrimethylammonium bromide on the electrochemiluminiscence and electrooxidation of luminol

1983 ◽  
Vol 48 (2) ◽  
pp. 477-483 ◽  
Author(s):  
Jan Lasovský ◽  
František Grambal
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Linear Sweep Voltammetry ◽  
Critical Micellar Concentration ◽  
Peak Height ◽  
Anodic Peak ◽  
Alkaline Solutions ◽  
Platinum Electrodes ◽  
Micellar Solutions ◽  
Linear Sweep ◽  
Low Concentrations

The electrooxidation of luminol in alkaline solutions in the presence of cetyltrimethylammonium bromide (I) was studied by linear sweep voltammetry on fixed and vibrating platinum electrodes. The presence of I in low concentrations (below the critical micellar concentration) brings about aggregation of the luminol, which is manifested by an increase in the anodic peak height and its shift towards lower potentials. In micellar solutions the peak height decreases owing to the slower diffusion of the bulkier micelles, the shift to lower potentials being preserved. The light-voltage curves correspond with the voltammetric curves, exhibiting identical shifts of the peak potentials in dependence on the concentration of the surfactant.

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