A hydrogel sensor driven by sodium carboxymethyl starch with synergistic enhancement of toughness and conductivity

Gao, Yiyan; Zhang, Zhixin; Ren, Xiuyan; Jia, Fei; Gao, Guanghui

doi:10.1039/d2tb00839d

Cited by 16 publications

(5 citation statements)

References 45 publications

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“…It could be possibly attributed to the water loss from the hydrogel during a long duration of tensile stretching. Also, during the long-time tensile process, the polymer chains were so fatigued that the network did not have enough time to recover, and hence prevented the electrons from moving rapidly and caused a high resistance. , The stability, repeatability, sensitivity, and broad sensing scale motivated the hydrogel sensor to display enormous potential for sign-to-speech flexible devices.…”

Section: Resultsmentioning

confidence: 99%

Bio-Inspired Homogeneous Conductive Hydrogel with Flexibility and Adhesiveness for Information Transmission and Sign Language Recognition

Wang

Hsu

et al. 2023

ACS Appl. Mater. Interfaces

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The wearable electronic technique is increasingly becoming an effective approach to overcoming the communication obstacles between signers and non-signers. However, the efficacy of conducting hydrogels currently proposed as flexible sensor devices is hindered by their poor processability and matrix mismatch, which frequently results in adhesion failure at the combined interfaces and deterioration of mechanical and electrochemical performance. Herein, we propose a hydrogel composed of a rigid matrix in which the hydrophobic and aggregated polyaniline was homogeneously embedded, while quaternate-functionalized nucleobase moieties endowed the flexible network with adhesiveness. Accordingly, the resulting hydrogel with chitosan-graf tpolyaniline (chi-g-PANI) copolymers exhibited a promising conductivity (4.8 S• m −1 ) because of the uniformly dispersed polyaniline components and a high strain strength (0.84 MPa) because of the chain entanglement of chitosan after soaking. In addition, the modified adenine molecules not only realized synchronization in improving the stretchability (up to 1303%) and exhibiting a skin-like elastic modulus (≈184 kPa), but also provided a durable interfacial contact with various materials. The hydrogel was further fabricated into a strain-monitoring sensor for information encryption and sign language transmission based on its sensing stability and strain sensitivity of up to 2.77. The developed wearable sign language interpreting system provides an innovative strategy to assist auditory or speech-impaired people in communicating with non-signers using visual−gestural patterns including body movements and facial expressions.

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Section: Resultsmentioning

confidence: 99%

Bio-Inspired Homogeneous Conductive Hydrogel with Flexibility and Adhesiveness for Information Transmission and Sign Language Recognition

Wang

Hsu

et al. 2023

ACS Appl. Mater. Interfaces

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“…Compared with other hydrogels in the available literature, the PVA-PHMG-ADSP hydrogel exhibited moderate mechanical performance, conductivity, and sensitivity, which was suitable for serving as a wearable sensor (Table S2). − …”

Section: Resultsmentioning

confidence: 99%

Acetylated Distarch Phosphate-Mediated Tough and Conductive Hydrogel for Antibacterial Wearable Sensors

Gao

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Conductive, stretchable, and flexible hydrogel wearable sensors have attracted extensive attention in the fields of artificial intelligence and electronic equipment. However, it is an enormous challenge to fabricate conductive hydrogel sensors with biocompatibility, antibacterial properties, and toughness. Here, a highly conductive hydrogel with excellent toughness, good biocompatibility, and strong antibacterial properties was prepared by incorporating acetylated distarch phosphate (ADSP) into poly(vinyl alcohol) (PVA)/polyhexamethylene biguanide hydrochloride (PHMG). The addition of ADSP not only ionized sodium ions to make the hydrogel conductive but also provided abundant hydroxyl groups to form hydrogen bonds with PVA to improve the toughness of the hydrogel. Furthermore, PHMG endowed the hydrogel with antibacterial properties toward E. coli (Escherichia coli, Gram-negative bacteria) and S. aureus (Staphylococcus aureus, Gram-positive bacteria). Meanwhile, the hydrogel was implanted in mice for 14 days, and the surrounding tissue remained in good condition. More importantly, the hydrogel could detect ECG signals and electrical signals under different actions. This study affords a novel approach for exploiting wearable sensors with antibacterial properties and biocompatibility.

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“…Similarly, the strong adhesion, durability, and stability of polydopamine (PDA), which is structurally analogous to mussel adhesion proteins, gives the PVA-prGO-PDA hydrogel sensor good electrical properties (conductivity of 0.5 S/m), mechanical stability (tensile stress and fracture strain of 146.5 KPa and 2580%), and self-adhesive capability (adhesion strength of 13.04 KPa) which enables the sensor to detect ECG signals . Furthermore, Gao et al introduced sodium carboxymethyl starch (CMS) similarly, and through electrostatic interactions and hydrogen bonds between the negatively charged CMS and the positively charged P-(Am-DMC) chain, the mechanical properties (toughness and elastic modulus of 430.81 kJ m –3 and 141.73 kPa, respectively) and conductivity (1.5 S/m) of the hydrogel epidermal sensor were simultaneously augmented to allow sensitive recording of ECG signal waveforms and myoelectric signal peaks, thus enabling dual applications on ECG and EMG. Alternatively, biomass materials such as proteins, lignin, and dopamine are gradually becoming available for ECG assays.…”

Section: Sensing Devicesmentioning

confidence: 99%

Conductive and Eco-friendly Biomaterials-based Hydrogels for Noninvasive Epidermal Sensors: A Review

Zhang,

Tang,

Zhou

et al. 2023

ACS Biomater. Sci. Eng.

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As noninvasive wearable electronic devices, epidermal sensors enable continuous, real-time, and remote monitoring of various human physiological parameters. Conductive biomaterials-based hydrogels as sensor matrix materials have good biocompatibility, biodegradability, and efficient stimulus response capabilities and are widely applied in motion monitoring, healthcare, and human−machine interaction. However, biomass hydrogelbased epidermal sensing devices still need excellent mechanical properties, prolonged stability, multifunctionality, and extensive practicality. Therefore, this paper reviews the common biomass hydrogel materials for epidermal sensing (proteins, polysaccharides, polyphenols, etc.) and the various types of noninvasive sensing devices (strain/pressure sensors, temperature sensors, glucose sensors, electrocardiograms, etc.). Moreover, this review focuses on the strategies of scholars to enhance sensor properties, such as strength, conductivity, stability, adhesion, and self-healing ability. This work will guide the preparation and optimization of high-performance biomaterials-based hydrogel epidermal sensors.

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A hydrogel sensor driven by sodium carboxymethyl starch with synergistic enhancement of toughness and conductivity

Abstract: Conductive hydrogels are potential materials for fabricating wearable strain sensors owing to their excellent mechanical property and high conductivity. However, it is a challenge to simultaneously enhance the mechanical property...

Cited by 16 publications

References 45 publications

Bio-Inspired Homogeneous Conductive Hydrogel with Flexibility and Adhesiveness for Information Transmission and Sign Language Recognition

Bio-Inspired Homogeneous Conductive Hydrogel with Flexibility and Adhesiveness for Information Transmission and Sign Language Recognition

Acetylated Distarch Phosphate-Mediated Tough and Conductive Hydrogel for Antibacterial Wearable Sensors

Conductive and Eco-friendly Biomaterials-based Hydrogels for Noninvasive Epidermal Sensors: A Review

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