Flexible A-scan rate MHz-OCT: efficient computational downscaling by coherent averaging

AbstractWe studied the initial stages of the electrodeposition of Pb in the presence of chlorine ions on Cu(100), using an oblique-incidence optical reflectivity difference (OIRD) technique. The OI-RD results reveal that immediately following the underpotential deposition (UPD) of the first Pb monolayer, two different types of bulk-phase films grow depending upon the magnitude of overpotential and cyclic voltammetry (CV) scan rate. At low overpotentials and/or slow scan rates, we propose that a bulk-phase Pb film grows on top of the UPD monolayer. At high overpotentials and/or fast scan rates, either a PbO, PbCl2, or a rough Pb bulk-phase layer grows on top of the UPD layer such that the reflectivity difference signal from such a film has an opposite sign.

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Matched scan rate pulse-compression analysis

Proceedings of the IEEE ◽

10.1109/proc.1966.4826 ◽

1966 ◽

Vol 54 (4) ◽

pp. 706-708 ◽

Cited By ~ 1

Author(s):

M.K. Ward

Keyword(s):

Pulse Compression ◽

Scan Rate

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Poly(aniline-co-pyrrole)-coated Ni-doped manganese dioxide as electrode materials for supercapacitors

Functional Materials Letters ◽

10.1142/s1793604720510078 ◽

2020 ◽

Vol 13 (02) ◽

pp. 2051007

Author(s):

Jie Dong ◽

Qinghao Yang ◽

Qiuli Zhao ◽

Zhenzhong Hou ◽

Yue Zhou ◽

...

Keyword(s):

Electrochemical Performance ◽

Manganese Dioxide ◽

Specific Capacitance ◽

Electrode Materials ◽

High Specific Capacitance ◽

Cycle Stability ◽

Mass Ratio ◽

Scan Rate ◽

Poly Aniline ◽

Inorganic And Organic

Electrode materials with a high specific capacitance, outstanding reversibility and excellent cycle stability are constantly pursued for supercapacitors. In this paper, we present an approach to improve the electrochemical performance by combining the advantages of both inorganic and organic. Ni-MnO2/PANi-co-PPy composites are synthesized, with the copolymer of aniline/pyrrole being coated on the surface of Ni-doped manganese dioxide nanospheres. The inorganic–organic composite enables a substantial increase in its specific capacitance and cycle stability. When the mass ratio of Ni-MnO2 to aniline and pyrrole mixed monomer is 1:5, the composite delivers high specific capacitance of 445.49[Formula: see text]F/g at a scan rate of 2[Formula: see text]mV/s and excellent cycle stability of 61.65% retention after 5000 cycles. The results indicate that the Ni-MnO2/PANi-co-PPy composites are promising electrode materials for future supercapacitors application.

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On the theory of cyclic voltammetry for multiple nucleation and growth: Scan rate influence

Journal of Electroanalytical Chemistry ◽

10.1016/j.jelechem.2021.115056 ◽

2021 ◽

Vol 883 ◽

pp. 115056

Author(s):

Alexander V. Kosov ◽

Olga V. Grishenkova ◽

Olga L. Semerikova ◽

Vladimir A. Isaev ◽

Yurii P. Zaikov

Keyword(s):

Cyclic Voltammetry ◽

Nucleation And Growth ◽

Scan Rate

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A Mutual Capacitance Touch Readout IC with Synchronization in Touch and Mobile Display Driving for High Refresh Rate AMOLED Panels

Micromachines ◽

10.3390/mi12080922 ◽

2021 ◽

Vol 12 (8) ◽

pp. 922

Author(s):

Seunghoon Ko

Keyword(s):

System Architecture ◽

Noise Suppression ◽

Touch Screen ◽

Horizontal Line ◽

Time Sharing ◽

Refresh Rate ◽

Front End ◽

Scan Rate ◽

Mutual Capacitance ◽

Analog Voltage

This paper presents a mutual capacitance touch readout IC architecture for 120 Hz high-refresh-rate AMOLED displays. In high-refresh-rate AMOLED panels, whole pixels in a horizontal line should be updated without any time-sharing with each other, leading to an amplified display noise on touch screen panel (TSP) electrodes. The proposed system architecture mitigates severe display noise by synchronizing the driving for the TSP and AMOLED pixel circuits. The proposed differential sensing technique, which is based on noise suppression in reference to mutual capacitance channels, minimizes common-mode display noise. In the front-end circuit, intrinsic circuit offset is cancelled by a chopping scheme, which correlates to the phase of the driving signals in the TSP driver and operating clocks of the front-end. Operating at a 120 Hz scan-rate, it reduces display noise by more than 11.6 dB when compared with the conventional single-ended TSP sensing method. With a built-in 130-nm CMOS, a prototype IC occupies an area of 8.02 mm2 while consuming 6.4-mW power from a 3.3 V analog voltage supply.

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An Electrochemical Strategy for the Simultaneous Detection of Doxorubicin and Simvastatin for Their Potential Use in the Treatment of Cancer

Biosensors ◽

10.3390/bios11010015 ◽

2021 ◽

Vol 11 (1) ◽

pp. 15

Author(s):

Iulia Rus ◽

Mihaela Tertiș ◽

Cristina Barbălată ◽

Alina Porfire ◽

Ioan Tomuță ◽

...

Keyword(s):

Drug Delivery ◽

Electrolyte Solution ◽

Electrode Material ◽

Dynamic Range ◽

Limit Of Detection ◽

Simultaneous Detection ◽

Linear Sweep Voltammetry ◽

Pharmaceutical Formulations ◽

Promising Tool ◽

Scan Rate

The aim of this study was to develop a disposable, simple, fast, and sensitive sensor for the simultaneous electrochemical detection of doxorubicin (DOX) and simvastatin (SMV), which could be used in preclinical studies for the development of new pharmaceutical formulations for drug delivery. Firstly, the electrochemical behavior of each molecule was analyzed regarding the influence of electrode material, electrolyte solution, and scan rate. After this, the proper electrode material, electrolyte solution, and scan rate for both active substances were chosen, and a linear sweep voltammetry procedure was optimized for simultaneous detection. Two chronoamperometry procedures were tested, one for the detection of DOX in the presence of SMV, and the other one for the detection of DOX and SMV together. Finally, calibration curves for DOX and SMV in the presence of each other were obtained using both electrochemical methods and the results were compared. The use of amperometry allowed for a better limit of detection (DOX: 0.1 μg/mL; SMV: 0.7 μg/mL) than the one obtained in voltammetry (1.5 μg/mL for both drugs). The limits of quantification using amperometry were 0.5 μg/mL for DOX (dynamic range: 0.5–65 μg/mL) and 2 μg/mL for SMV (dynamic range: 2–65 μg/mL), while using voltammetry 1 μg/mL was obtained for DOX (dynamic range: 1–100 μg/mL) and 5 μg/mL for SMV (dynamic range: 5–100 μg/mL). This detection strategy represents a promising tool for the analysis of new pharmaceutical formulations for targeted drug delivery containing both drugs, whose association was proven to bring benefits in the treatment of cancer.

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Surfactant-free synthesis of carbon-supported silver (Ag/C) nanobars as an efficient electrocatalyst for alcohol tolerance and oxidation of sodium borohydride in alkaline medium

SN Applied Sciences ◽

10.1007/s42452-021-04601-9 ◽

2021 ◽

Vol 3 (6) ◽

Author(s):

Santanu Dey ◽

Pradipta Chakraborty ◽

Dhiraj Kumar Rana ◽

Subhamay Pramanik ◽

Soumen Basu

Keyword(s):

Cyclic Voltammetry ◽

Ethylene Glycol ◽

Alkaline Medium ◽

Sodium Borohydride ◽

Metallic Silver ◽

Alcohol Tolerance ◽

Current Ratio ◽

X Ray ◽

Scan Rate ◽

Borohydride Oxidation

AbstractWe have synthesized carbon-supported silver (Ag/C) nanobars by a simple surfactant-free hydrothermal method using glucose as the reducing reagent as well as the source of carbon in Ag/C nanobars. Physicochemical characterization of the materials was performed by X-ray Diffraction (XRD), field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The XRD pattern confirmed the presence of a pure metallic silver phase. No carbon phase was detected, which indicates that the carbon exists mainly in the amorphous form. The electrocatalytic activity of Ag/C in different electrolyte solutions such as 0.5 M NaOH, 0.5 M NaOH + 1 M ethanol (EtOH), 0.5 M NaOH + 1 M ethylene glycol (EG), and 0.5 M NaOH + 0.01 M NaBH4 (sodium borohydride) was studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CA) study. Alcohol tolerance of the catalysts was also established in the presence of ethanol and ethylene glycol. The forward-to-backward current ratio from cyclic voltammetry (CV) study of Ag/C-20 (20 h) in 0.5 M NaOH + 1 M ethanol solution at 100 mV s−1 scan rate is 4.13 times higher compared to that of Ag/C-5 (5 h). Hence, Ag/C-20 is a better candidate for the tolerance of ethanol. In the presence of ethylene glycol (1 M) in 0.5 M NaOH solution, it is obtained that the forward-to-backward current ratio at the same scan rate for Ag/C-20 is lower than that in the presence of ethanol. The durability of the catalyst was studied by chronoamperometry measurement. We studied the electrochemical kinetics of Ag/C catalysts for borohydride oxidation in an alkaline medium. The basic electrochemical results for borohydride oxidation show that Ag/C has very well strength and activity for direct borohydride oxidation in an alkaline medium. The reaction of borohydride oxidation with the contemporaneous BH4−. hydrolysis was noticed at the oxidized silver surface. Among all the synthesized Ag/C catalysts, Ag/C-20 exhibited the best electrocatalytic performance for borohydride oxidation in an alkaline medium. The activation energy and the number of exchange electrons at Ag/C-20 electrode surface for borohydride electro-oxidation were estimated as 57.2 kJ mol−1 and 2.27, respectively.

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Exfoliation in a low boiling point solvent and electrochemical applications of MoO3

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.11.52 ◽

2020 ◽

Vol 11 ◽

pp. 662-670

Author(s):

Matangi Sricharan ◽

Bikesh Gupta ◽

Sreejesh Moolayadukkam ◽

H S S Ramakrishna Matte

Keyword(s):

Energy Storage ◽

Electrode Material ◽

Electronic Devices ◽

High Specific Capacitance ◽

Two Dimensional ◽

Energy Storage Devices ◽

Intrinsic Nature ◽

Storage Devices ◽

Scan Rate ◽

First Time

MoO3 is a versatile two-dimensional transition metal oxide having applications in areas such as energy storage devices, electronic devices and catalysis. To efficiently utilize the properties of MoO3 arising from its two-dimensional nature exfoliation is necessary. In this work, the exfoliation of MoO3 is carried out in 2-butanone for the first time. The achieved concentration of the dispersion is about 0.57 mg·mL−1 with a yield of 5.7%, which are the highest values reported to date. These high values of concentration and yield can be attributed to a favorable matching of energies involved in exfoliation and stabilization of MoO3 nanosheets in 2-butanone. Interestingly, the MoO3 dispersion in 2-butanone retains its intrinsic nature even after exposure to sunlight for 24 h. The composites of MoO3 nanosheets were used as an electrode material for supercapacitors and showed a high specific capacitance of 201 F·g−1 in a three-electrode configuration at a scan rate of 50 mV·s−1.

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