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Epidermal Sensors Constructed by a Stabilized Nanosilver Hydrogel with Self-Healing, Antimicrobial, and Temperature-Responsive Properties. | LitMetric

AI Article Synopsis

  • - The study introduces a new conductive hydrogel called PHCB, created using a gentle method and showcasing impressive features like electrical conductivity, self-healing, antimicrobial properties, and temperature sensitivity.
  • - PHCB's strong mechanical performance comes from the combination of hydroxypropylmethylcellulose (HPMC) and carboxylated carbon nanotubes, providing a healing efficiency of 74.1% due to special bonds within the material.
  • - Successfully integrated into wearable sensors, PHCB can detect human movements, including subtle actions like speaking, and also functions as a pressure sensor for monitoring skin pressure changes.

Article Abstract

The development of conductive hydrogels has garnered significant attention in the field of wearable devices and smart sensors. However, the fabrication of hydrogels that possess both multifunctionality and structural stability remains a challenging task. In this study, a novel hydrogel, PHCB, was synthesized using a mild method and exhibited outstanding characteristics such as electrical conductivity, self-healing capability, antimicrobial activity, dimensional stability, and temperature sensitivity. The exceptional mechanical performance (∼120 kPa at a strain of 450%) of PHCB is attributed to the incorporation of hydroxypropylmethylcellulose (HPMC) and the mechanical reinforcement of the gel network by carboxylated carbon nanotubes (CNT-COOH). The borate bonds between or within poly(vinyl alcohol) (PVA) chains confer self-healing capabilities upon PHCB, with a healing efficiency of 74.1%. The in situ reduction of silver nanoparticles through ultraviolet irradiation imparts antimicrobial characteristics to the hydrogel [against , zone of inhibition (ZOI) = 3.7 mm; against , ZOI = 6.3 mm]. The linear temperature responsiveness of the PHCB hydrogel ( = -3.99 + 608.84 and COD = 0.9988) arises from the migration of silver ions within the gel matrix and the dissociation of borate bonds. Furthermore, PHCB was seamlessly integrated into sensors designed for monitoring human motion. The gel-based sensors exhibited three distinct sensing strain ranges corresponding to three different gauge factors (GF = 2.976, GF = 1.063, and GF = 2.97). Notably, PHCB gel sensors demonstrated the capability to detect electrical signals generated by finger and wrist joint movements and even discerned signals arising from subtle deformations induced by activities such as speaking. Additionally, the PHCB gel was utilized as a pressure sensor to detect external pressures applied to the skin (from 0.373 to 15.776 kPa). This work expands the avenues for designing and synthesizing multifunctional conductive hydrogels, promoting the application of hydrogel sensors with comfortable wear and high sensitivity.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11656214PMC
http://dx.doi.org/10.1021/acsomega.3c10135DOI Listing

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