Flexible Strain-Sensitive Silicone-CNT Sensor for Human Motion Detection

Demidenko, Natalia; Kuksin, Artem V.; Molodykh, Victoria V.; Pyankov, Evgeny S.; Ичкитидзе, Л. П.; Zaborova, Victoria; Цымбал, А. А.; Tkachenko, Svetlana A.; Shafaei, Hassan; Diachkova, Ekaterina; Gerasimenko, Alexander Yu.

doi:10.3390/bioengineering9010036

Cited by 21 publications

(12 citation statements)

References 65 publications

(62 reference statements)

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“…The PDMS/CNT@MXene-based adjustable strain sensor only offers the GF of 16 for the strain range between 0 and 40% . Ecoflex silicone and CNT-based strain sensor demonstrated a maximum of 4.9 as the GF in the range between 0 and 100% . The GF noted in this work has been compared to different materials reported in the literature and is shown in Table S4.…”

Section: Resultsmentioning

confidence: 79%

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Printable Carbon Nanotube-Liquid Elastomer-Based Multifunctional Adhesive Sensors for Monitoring Physiological Parameters

Sharma

Naskar

et al. 2022

ACS Appl. Mater. Interfaces

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Developing a printed elastomeric wearable sensor with good conformity and proper adhesion to skin, coupled with the capability of monitoring various physiological parameters, is very crucial for the development of point-of-care sensing devices with high precision and sensitivity. While there have been previous reports on the fabrication of elastomeric multifunctional sensors, research on the printable elastomeric multifunctional adhesive sensor is not very well explored. Herein, we report the development of a stencil printable multifunctional adhesive sensor fabricated in a solvent-free condition, which demonstrated the capability of having good contact with skin and its ability to function as a temperature and strain sensor. Functionalized liquid isoprene rubber was selected as the matrix while carboxylated multiwalled carbon nanotubes (c-CNTs) were used as the nanofiller. The selection of the above model compounds facilitated the printability and also helped the same composition to demonstrate stretchability and adhesiveness. A realistic three-dimensional microstructure (representative volume element model) was generated through a computational framework for the current c-CNT-liquid elastomer. Further computational simulations were performed to test and validate the correlation between electrical responses to that of experimental studies. Various physiological parameters like motion sensing, pulse, respiratory rate, and phonetics detection were detected by leveraging the electrically resistive nature of the sensor. This development route can be extended toward developing different innovative adhesives for point-of-care sensing applications.

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Section: Resultsmentioning

confidence: 79%

“…52 Ecoflex silicone and CNT-based strain sensor demonstrated a maximum of 4.9 as the GF in the range between 0 and 100%. 53 The GF noted in this work has been compared to different materials reported in the literature and is shown in Table S4.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Printable Carbon Nanotube-Liquid Elastomer-Based Multifunctional Adhesive Sensors for Monitoring Physiological Parameters

Sharma

Naskar

et al. 2022

ACS Appl. Mater. Interfaces

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“…The laser-induced SWCNT framework provides an increased strength of the biopolymer material [ 46 , 47 ]. The strength is highly dependent on the formed composite structure morphology of the biopolymers and nanotube network [ 48 ]. In this regard, the morphology of solders both with and without nanotubes was analyzed by SEM ( Figure 3 ).…”

Section: Resultsmentioning

confidence: 99%

Reconstruction of Soft Biological Tissues Using Laser Soldering Technology with Temperature Control and Biopolymer Nanocomposites

et al. 2022

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Laser soldering is a current biophotonic technique for the surgical recovery of the integrity of soft tissues. This technology involves the use of a device providing laser exposure to the cut edges of the wound with a solder applied. The proposed solder consisted of an aqueous dispersion of biopolymer albumin (25 wt.%), single-walled carbon nanotubes (0.1 wt.%) and exogenous indocyanine green chromophore (0.1 wt.%). Under laser exposure, the dispersion transforms into a nanocomposite due to the absorption of radiation and its conversion into heat. The nanocomposite is a frame structure of carbon nanotubes in a biopolymer matrix, which provides adhesion of the wound edges and the formation of a strong laser weld. A new laser device based on a diode laser (808 nm) has been developed to implement the method. The device has a temperature feedback system based on a bolometric infrared matrix sensor. The system determines the hottest area of the laser weld and adjusts the current supplied to the diode laser to maintain the preset laser heating temperature. The laser soldering technology made it possible to heal linear defects (cuts) in the skin of laboratory animals (rabbits) without the formation of a fibrotic scar compared to the control (suture material). The combined use of a biopolymer nanocomposite solder and a laser device made it possible to achieve a tensile strength of the laser welds of 4 ± 0.4 MPa. The results of the experiment demonstrated that the addition of single-walled carbon nanotubes to the solder composition leads to an increase in the ultimate tensile strength of the laser welds by 80%. The analysis of regenerative and morphological features in the early stages (1–3 days) after surgery revealed small wound gaps, a decrease in inflammation, the absence of microcirculatory disorders and an earlier epithelization of laser welds compared to the control. On the 10th day after the surgical operation, the laser weld was characterized by a thin cosmetic scar and a continuous epidermis covering the defect. An immunohistochemical analysis proved the absence of myofibroblasts in the area of the laser welds.

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“…Various fabrication methods according to matrix materials are being studied for the carbon nanotube-based composites [ 19 , 20 ]. In this study, the CNT/EP coating was fabricated based on the previous study [ 8 , 9 , 10 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

Temperature Detectable Surface Coating with Carbon Nanotube/Epoxy Composites

et al. 2022

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In the construction and machinery industry, heat is a major factor causing damage and destruction. The safety and efficiency of most machines and structures are greatly affected by temperature, and temperature management and control are essential. In this study, a carbon nanotube (CNT) based temperature sensing coating that can be applied to machines and structures having various structural types was fabricated, and characteristics analysis and temperature sensing performance were evaluated. The surface coating, which detects temperature through resistance change is made of a nanocomposite composed of carbon nanotubes (CNT) and epoxy (EP). We investigated the electrical properties by CNT concentration and temperature sensing performance of CNT/EP coating against static and cyclic temperatures. In addition, the applicability of the CNT/EP coating was investigated through a partially heating and cooling experiment. As a result of the experiment, the CNT/EP coating showed higher electrical conductivity as the CNT concentration increased. In addition, the CNT/EP coating exhibits high sensing performance in the high and sub−zero temperature ranges with a negative temperature coefficient of resistance. Therefore, the proposed CNT/EP coatings are promising for use as multi-functional coating materials for the detection of high and freezing temperatures.

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Flexible Strain-Sensitive Silicone-CNT Sensor for Human Motion Detection

Cited by 21 publications

References 65 publications

Printable Carbon Nanotube-Liquid Elastomer-Based Multifunctional Adhesive Sensors for Monitoring Physiological Parameters

Printable Carbon Nanotube-Liquid Elastomer-Based Multifunctional Adhesive Sensors for Monitoring Physiological Parameters

Reconstruction of Soft Biological Tissues Using Laser Soldering Technology with Temperature Control and Biopolymer Nanocomposites

Temperature Detectable Surface Coating with Carbon Nanotube/Epoxy Composites

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