Optimized CNT-PDMS Flexible Composite for Attachable Health-Care Device

Du, Jian; Wang, Li; Shi, Yanchao; Zhang, Feng; Hu, Shiheng; Liu, Pengbo; Li, Anqing

doi:10.3390/s20164523

Cited by 55 publications

(23 citation statements)

References 55 publications

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“…PDMS has high flexibility, good chemical and thermal stability and biocompatibility with easy fabrication steps which makes it a popular choice for realizing bio-flexible devices [42] . In addition, CNTs have also been a popular choice for sensors and wearable devices due to its tunable electrical, mechanical and sensing properties [43] , [44] . Screen printing technique was used for coating MWCNT/PDMS composite interdigitated electrode over a paper substrate and silver glue for contact territory on the same.…”

Section: Introductionmentioning

confidence: 99%

Flexible, Highly Sensitive Paper-Based Screen Printed MWCNT/PDMS Composite Breath Sensor for Human Respiration Monitoring

2021

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Accurate measurement and monitoring of respiration is vital in patients affected by severe acute respiratory syndrome coronavirus -2 (SARS-CoV-2). Patients with severe chronic diseases and pneumonia need continuous respiration monitoring and oxygenation support. Existing respiratory sensing techniques require direct contact with the human body along with expensive and heavy Holter monitors for continuous real-time monitoring. In this work, we propose a low-cost, non-invasive and reliable paper-based wearable screen printed sensor for human respiration monitoring as an effective alternative of existing sensing systems. The proposed sensor was fabricated using traditional screen printing of multi-walled carbon nanotubes (MWCNTs) and polydimethylsiloxane (PDMS) composite based interdigitated electrodes on paper substrate. The paper substrate was used as humidity sensing material of the sensor. The hygroscopic nature of paper during inhalation and exhalation causes a change in dielectric constant, which in turn changes the capacitance of the sensor. The composite interdigitated electrode configuration exhibited better response times with a rise time of 1.178s being recorded during exhalation and fall time of 0.88s during inhalation periods. The respiration rate of sensor was successfully examined under various breathing conditions such as normal breathing, deep breathing, workout, oral breathing, nasal breathing, fast breathing and slow breathing by employing it in a wearable mask, a mandatory wearable product during the current COVID-19 pandemic situation.Thus, the above proposed sensor may hold tremendous potential in wearable/flexible healthcare technology with good sensitivity, stability, biodegradability and flexibility at this time of need.

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Section: Introductionmentioning

confidence: 99%

Flexible, Highly Sensitive Paper-Based Screen Printed MWCNT/PDMS Composite Breath Sensor for Human Respiration Monitoring

2021

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“…The three working electrodes and counter electrode were fabricated from an MWCNT-PDMS paste, which was a mixture of MWCNT and PDMS to form a screen-printable dough. Because the size and surface area of the CNTs vary depending on the manufacturer, their proportion may change 22 . The MWCNT-PDMS dough was printed on the stencil mask and baked at 70 ℃ for 2 h, followed by cooling at room temperature (25 ℃) and removal of the stencil mask.…”

Section: Methodsmentioning

confidence: 99%

“…In the present study, multi-walled (MW) CNTs and polydimethylsiloxane (PDMS) were mixed to produce a MWCNT-PDMS paste for screen-printing flexible electrodes on paper substrate. The CNT-PDMS composite is physically robust and flexible, with good reproducible electrical resistance 22 . This composite has been generally used for pressure or tactile sensors, but rarely used for electrochemical biosensors despite the advantages for the paper-based sensors.…”

Section: Introductionmentioning

confidence: 99%

Paper-based electrochemical immunosensor for label-free detection of multiple avian influenza virus antigens using flexible screen-printed carbon nanotube-polydimethylsiloxane electrodes

Lee

Bhardwaj

Jang

2022

Sci Rep

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Many studies have been conducted on measuring avian influenza viruses and their hemagglutinin (HA) antigens via electrochemical principles; most of these studies have used gold electrodes on ceramic, glass, or silicon substrates, and/or labeling for signal enhancement. Herein, we present a paper-based immunosensor for label-free measurement of multiple avian influenza virus (H5N1, H7N9, and H9N2) antigens using flexible screen-printed carbon nanotube-polydimethylsiloxane electrodes. These flexible electrodes on a paper substrate can complement the physical weakness of the paper-based sensors when wetted, without affecting flexibility. The relative standard deviation of the peak currents was 1.88% when the electrodes were repeatedly bent and unfolded twenty times with deionized water provided each cycle, showing the stability of the electrodes. For the detection of HA antigens, approximately 10-μl samples (concentration: 100 pg/ml–100 ng/ml) were needed to form the antigen–antibody complexes during 20–30 min incubation, and the immune responses were measured via differential pulse voltammetry. The limits of detections were 55.7 pg/ml (0.95 pM) for H5N1 HA, 99.6 pg/ml (1.69 pM) for H7N9 HA, and 54.0 pg/ml (0.72 pM) for H9N2 HA antigens in phosphate buffered saline, and the sensors showed good selectivity and reproducibility. Such paper-based sensors are economical, flexible, robust, and easy-to-manufacture, with the ability to detect several avian influenza viruses.

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“…The electrical and electromechanical properties of MWCNT‐PDMS composites were reported in a previous research. [ 59 ] For fabricating a bare electrode, MWCNTs and PDMS with a weight ratio of 8 wt.% were first dispersed by the dry blending method at a speed of 150 rpm for 24 h. Then, the prepolymer MWCNT‐PDMS composites were vacuum treated for 30 min under the absolute pressure of ≈80 Pa. Subsequently, the curing agent of PDMS was added into the MWCNT‐PDMS composites with a weight ratio of 1:10 and was blended for 2 min.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of a Free‐Standing MWCNT Electrode by Electric Field Force for an Ultra‐Sensitive MicroRNA‐21 Nano‐Genosensor

Wang

et al. 2022

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Abnormal expression of microRNA‐21 (miR‐21) is considered to be closely associated with the pathogenesis of colorectal cancer. However, great challenges do exist for the development of ultra‐sensitive biosensors to detect the abnormal expression of miR‐21 due to the low concentration in serum (fm level) at the early stage of colorectal cancer. Therefore, electric field force is used to rotate and rearrange random multi‐walled carbon nanotubes (MWCNTs) at the microscale to improve the active sites of the electrode in this study. The free‐standing MWCNTs are densely and high‐orderly embedded into the bare electrode along the direction of the electric field. Compared to the bare electrode, the peak‐current response of the free‐standing MWCNT electrode improves by 150 times in cyclic voltammetric measurement. A nano‐genosensor based on the free‐standing MWCNT electrode is developed for measuring miR‐21. The nano‐genosensor for miR‐21 shows an ultra‐high sensitivity of 48.24 µA µm−1, a wide linear range from 0.01 × 10−15 to 100 × 10−12 m, and a low detection limit of 1.2 × 10−18 m. The present nano‐genosensor shows superior performance for miR‐21 in human serum samples and demonstrates a potential application for the diagnosis of early stage colorectal cancer.

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Optimized CNT-PDMS Flexible Composite for Attachable Health-Care Device

Cited by 55 publications

References 55 publications

Flexible, Highly Sensitive Paper-Based Screen Printed MWCNT/PDMS Composite Breath Sensor for Human Respiration Monitoring

Flexible, Highly Sensitive Paper-Based Screen Printed MWCNT/PDMS Composite Breath Sensor for Human Respiration Monitoring

Paper-based electrochemical immunosensor for label-free detection of multiple avian influenza virus antigens using flexible screen-printed carbon nanotube-polydimethylsiloxane electrodes

Fabrication of a Free‐Standing MWCNT Electrode by Electric Field Force for an Ultra‐Sensitive MicroRNA‐21 Nano‐Genosensor

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