Localized Capture of Bacteria in an Interdigitated Electrode Impedance Biosensor

2022 ◽  
Vol 20 (3) ◽  
pp. 402-408
Author(s):  
Alvaro Zazueta-Gambino ◽  
Claudia Reyes-Betanzo ◽  
Victor Manuel Jimenez-Fernandez
Keyword(s):  
Electrode Impedance ◽  
Interdigitated Electrode

scholarly journals Noise-Reducing Fabric Electrode for ECG Measurement

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4305
Author(s):  
Takamasa Terada ◽  
Masahiro Toyoura ◽  
Takahide Sato ◽  
Xiaoyang Mao
Keyword(s):  
Special Structure ◽  
Electrode Impedance ◽  
Electrode Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Chip Type ◽  
Low Pass ◽  
Filter Fabric

In this work, we propose a fabric electrode with a special structure that can play the role of a noise reduction filter. Fabric electrodes made of the conductive fabric have been used for long-term ECG measurements because of their flexibility and non-invasiveness; however, due to the large impedance between the skin and the fabric electrodes, noise is easily introduced into the ECG signal. In contrast to conventional work, in which chip-type passive elements are glued to the electrode to reduce noise, the proposed electrode can obtain a noise-reduced ECG by changing the structure of fabric. Specifically, the proposed electrode was folded multiple times to form a capacitor with a capacitance of about 3 nF. It is combined with the skin-electrode impedance to form a low-pass filter. In the experiment, we made a prototype of the electrodes and measured ECG at rest and during EMG-induced exercise. As a result, the SNR values at rest and during exercise were improved about 12.02 and 10.29 , respectively, compared with the fabric electrode without special structure. In conclusion, we have shown that changing the fabric electrode structure effectively removes noise in ECG measurement.

Development of a Compact Electrical Impedance Measurement Circuit for Protein Detection Two-electrode Impedance Micro-sensor

2021 ◽  
pp. 1-9
Author(s):  
Tuan Vu Quoc ◽  
Viet Nguyen Ngoc ◽  
Bao-Anh Hoang ◽  
Chun-Ping Jen ◽  
Trinh Chu Duc ◽  
...  
Keyword(s):  
Electrical Impedance ◽  
Impedance Measurement ◽  
Protein Detection ◽  
Electrode Impedance ◽  
Measurement Circuit ◽  
Electrical Impedance Measurement ◽  
Micro Sensor

scholarly journals Electrode impedance analysis of chronic tungsten microwire neural implants: understanding abiotic vs. biotic contributions

2014 ◽  
Vol 7 ◽  
Author(s):  
Viswanath Sankar ◽  
Erin Patrick ◽  
Robert Dieme ◽  
Justin C. Sanchez ◽  
Abhishek Prasad ◽  
...  
Keyword(s):  
Impedance Analysis ◽  
Electrode Impedance ◽  
Neural Implants

Capacitive aptasensor based on interdigitated electrode for breast cancer detection in undiluted human serum

2018 ◽  
Vol 102 ◽  
pp. 106-112 ◽  
Author(s):  
Sunil K. Arya ◽  
Pavel Zhurauski ◽  
Pawan Jolly ◽  
Marina R. Batistuti ◽  
Marcelo Mulato ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Human Serum ◽  
Cancer Detection ◽  
Breast Cancer Detection ◽  
Interdigitated Electrode

Gauging performance of biosynthesized silver nanoparticles loaded polypropylene nonwoven based textile electrodes for 3-lead health monitoring electro cardiogram on analogous system

2021 ◽  
pp. 152808372110256
Author(s):  
Tasnim N Shaikh ◽  
SB Chaudhari ◽  
BH Patel ◽  
Megha Patel
Keyword(s):  
Silver Nanoparticles ◽  
Health Monitoring ◽  
Nonwoven Fabric ◽  
Motion Artifacts ◽  
Ocimum Sanctum ◽  
Testing Time ◽  
Electrode Impedance ◽  
Air Voids ◽  
Textile Electrodes ◽  
Analogous System

This work reports the engineering of textile electrodes, considered safe for humans even if worn next to skin for a longer time. Obliging this phenomenon conductive Silver nanoparticles (AgNPs) were biosynthesized from Silver Sulphate (Ag2SO4) and medicinal values enriched Ocimum Sanctum (Tulsi)leaves extract. These conductive Silver nanoparticles were loaded by spray technique on polypropylene nonwoven fabric having inbuilt antifungal characteristics, to reduce its resistivity (10Ω) for the fabrication of textile electrodes. The adequate skin-electrode impedance values were observed for the fabricated textile electrodes, viz; 1.44 MΩ–1.83 MΩ and 1.01 MΩ–1.18 MΩ, in the dry and wet state respectively. The 3-lead health monitoring electrocardiograms (ECG) were obtained on the Analogous system with the textile electrodes; dry and wet state as well as gel electrodes. The cardiograms were also taken at a smaller triangle than usual, only for the high resistance textile electrodes. The wet electrodes have executed considerably better clarity of PQR wavelets than reference gel electrodes ECG plots, and their performance was found consistent when tested after six months’ time leap. However, higher motion artifacts caused in the case of dry electrodes have resulted in distorted PQR wavelets and the tracing became worsen with increased testing time leap. This was mainly due to the encapsulation of conductive AgNPs in the air voids of the fabric, increased resistivity. The cardiogram quality has not shown peculiar benefit for a higher heart pumping pressure at the smaller triangle in either of the cases.

scholarly journals Mathematical modeling of interdigitated electrode arrays in finite electrochemical cells

2013 ◽  
Vol 705 ◽  
pp. 19-29 ◽  
Author(s):  
Cristian Guajardo ◽  
Sirimarn Ngamchana ◽  
Werasak Surareungchai
Keyword(s):  
Mathematical Modeling ◽  
Electrochemical Cells ◽  
Electrode Arrays ◽  
Interdigitated Electrode

scholarly journals Gold-nanourchin complexed silicon dioxide-probe on gap-fingered interdigitated electrode surface for Parkinson’s Disease determination by current–volt measurement

2021 ◽  
Vol 11 ◽  
pp. 184798042098735
Author(s):  
Xiaohong Li ◽  
Wei Shi ◽  
Wenyan Zhang ◽  
Weiyao Chen ◽  
Dan Cao ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Silicon Dioxide ◽  
Limit Of Detection ◽  
Detection System ◽  
Interdigitated Electrode ◽  
Limit Of Quantification ◽  
Neurofilament Light Chain ◽  
Neurofilament Light ◽  
Detection Range

Parkinson’s disease (PD) is a nervous disorder, affects physical movement, and leads to difficulty in balancing, walking, and coordination. A novel sensor is mandatory to determine PD and monitor the progress of the treatment. Neurofilament light chain (NfL) has been recognized as a good biomarker for PD and also helps to distinguish between PD and atypical PD syndromes. Immunosensor was generated by current–volt measurement on gap-fingered interdigitated electrode with silicon dioxide surface to determine NfL level. To enhance the detection, anti-NfL antibody was complexed with gold-nanourchin and immobilized on the sensing electrode. The current–volt response was gradually increased at the linear detection range from 100 fM to 1 nM. Limit of detection and sensitivity were 100 fM with the signal-to-noise ratio at n = 3 on a linear curve ( y = 0.081 x + 1.593; R 2 = 0.9983). Limit of quantification falls at 1 pM and high performance of the sensor was demonstrated by discriminating against other neurogenerative disease markers, in addition, it was reproducible even in serum-spiked samples. This method of detection system aids to measure the level of NfL and leads to determine the condition with PD.

scholarly journals H2S-Sensing Studies Using Interdigitated Electrode with Spin-Coated Carbon Aerogel-Polyaniline Composites

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1457
Author(s):  
Aamna Bibi ◽  
Yuola Rose M. Rubio ◽  
Karen S. Santiago ◽  
His-Wei Jia ◽  
Mahmoud M. M. Ahmed ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Carbon Aerogel ◽  
Average Response Time ◽  
Interdigitated Electrode ◽  
Gas Sensing Properties ◽  
Increased Sensitivity ◽  
Good Repeatability ◽  
Polyaniline Composites ◽  
Coated Carbon ◽  
Better Than

In this paper, carbon aerogel (CA)-polyaniline (PANI) composites were prepared and first applied in the study of H2S gas sensing. Here, 1 and 3 wt% of as-obtained CA powder were blended with PANI to produce composites, which are denoted by PANI-CA-1 and PANI-CA-3, respectively. For the H2S gas-sensing studies, the interdigitated electrode (IDE) was spin-coated by performing PANI and PANI-CA composite dispersion. The H2S gas-sensing properties were studied in terms of the sensor’s sensitivity, selectivity and repeatability. IDE coated with PANI-CA composites, as compared with pristine PANI, achieved higher sensor sensitivity, higher selectivity and good repeatability. Moreover, composites that contain higher loading of CA (e.g., 3 wt%) perform better than composites with lower loading of CA. At 1 ppm, PANI-CA-3 displayed increased sensitivity of 452% at relative humidity of 60% with a fast average response time of 1 s compared to PANI.

Micromolding Fabrication of Biocompatible Dry Micro-Pyramid Array Electrodes for Wearable Biopotential Monitoring

2021 ◽  
Author(s):  
Marco Vinicio Alban ◽  
Haechang Lee ◽  
Hanul Moon ◽  
Seunghyup Yoo
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Skin Irritation ◽  
Electrode Impedance ◽  
Non Invasive ◽  
Solution Processes ◽  
Dry Electrodes ◽  
Array Electrode ◽  
Low Cost Manufacturing ◽  
Electromyography Signals

Abstract Thin dry electrodes are promising components in wearable healthcare devices. Assessing the condition of the human body by monitoring biopotentials facilitates the early diagnosis of diseases as well as their prevention, treatment, and therapy. Existing clinical-use electrodes have limited wearable-device usage because they use gels, require preparation steps, and are uncomfortable to wear. While dry electrodes can improve these issues and have demonstrated performance on par with gel-based electrodes, providing advantages in mobile and wearable applications; the materials and fabrication methods used are not yet at the level of disposable gel electrodes for low-cost mass manufacturing and wide adoption. Here, a low-cost manufacturing process for thin dry electrodes with a conductive micro-pyramidal array is presented for large-scale on-skin wearable applications. The electrode is fabricated using micromolding techniques in conjunction with solution processes in order to guarantee ease of fabrication, high device yield, and the possibility of mass production compatible with current semiconductor production processes. Fabricated using a conductive paste and an epoxy resin that are both biocompatible, the developed micro-pyramidal array electrode operates in a conformal, non-invasive manner, with low skin irritation, which ensures improved comfort for brief or extended use. The operation of the developed electrode was examined by analyzing electrode-skin-electrode impedance, electroencephalography, electrocardiography, and electromyography signals and comparing them with those measured simultaneously using gel electrodes.

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