A Dual‐Function Sensor for Highly Sensitive Detection of Flame and Humidity

Zhang, Zuocai; Lu, Tianyun; Yang, Dan; Lu, Shaorong; Cai, Ren; Tan, Weihong

doi:10.1002/smll.202203334

Cited by 24 publications

(11 citation statements)

References 41 publications

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“…This circuit can be regarded as a simple strain sensor for recording the relative resistance of the hydrogels under different strains and times. Eq was used to calculate the relative resistance change (Δ R / R 0 ) normalΔ R / R 0 .25em ( % ) = ( R − R 0 ) / R 0 × 100 % where R 0 and R are the resistance of the original sample and the sample under applied strain, respectively.…”

Section: Methodsmentioning

confidence: 99%

Self-Healing and Freeze-Resistant Boat-Fruited Sterculia Seed Polysaccharide/Silk Fiber Hydrogel for Wearable Strain Sensors

Han,

Lu,

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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This study introduces a sustainable bio-based hydrogel crafted from boat-fruited Sterculia seed polysaccharide (BF), silk fiber (SF), calcium chloride (CaCl2), and borax. The inherent hydrophilic groups and natural network structure of BF are conducive to the formation of a hydrogel with a high water content and a porous structure. The SF serves a dual role, providing structural support and acting as an antifreezing agent. The unique structure of this hydrogel is characterized by reversible dynamic cross-links, including hydrogen, borate ester, and Ca2+/–COOH coordination bonds, which endow it with excellent self-healing, mechanical, thermoreversible, and freeze-resistant properties. The bio-based hydrogel successfully adheres to various surfaces, including skin, and provides stable, repeatable electrical signals for the monitoring of diverse human movements (e.g., elbow and wrist movement) and subtle facial expressions. Moreover, the hydrogel exhibits excellent stability and reusability. Our study thus provides a convenient and environmentally friendly strategy for fabricating self-healing hydrogels with promising applications in healthcare monitoring or human–computer interactions.

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Section: Methodsmentioning

confidence: 99%

Self-Healing and Freeze-Resistant Boat-Fruited Sterculia Seed Polysaccharide/Silk Fiber Hydrogel for Wearable Strain Sensors

Han,

Lu,

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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“…After turning off the light power, the temperature quickly falls down to 29 °C within 40 s. Therefore, the composite foam, by the virtue of lightweight and broadband high-efficiency photothermal features, can also be used to convert light into heat and apply in various complex and harsh conditions. [58,65,66]…”

Section: Light Absorption and Light-driven Shape Memory Properties Of...mentioning

confidence: 99%

Triple Stimuli‐Responsive Flexible Shape Memory Foams with Super‐Amphiphilicity

Ding

Shi

et al. 2022

Small

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source. Ko et al. construct a temperature-responsive SMP film by integrating polylactic acid (PLA) and thermoplastic polyurethane (TPU). [15] Ni et al. simply adjust the layers of graphene oxide coating on SMP to design thermal-responsive devices. [16] However, the single responsive ability cannot meet the requirement of increasingly complex and changeable application environment. [17][18][19] On the other hand, the solid planar or strip geometries of traditional SMPs limit the expansion of new horizons. [20][21][22][23] Thus, it is urgent and important to fabricate 3D porous and flexible SMPs with multiresponsive function.Recent advances have progressed to use a 3D porous material as the framework added with functional fillers to construct electrical/thermal conductive networks for achieving multi-responsive SME. [24,25] MS has aroused great interest as the 3D framework for its low cost, low density, high porosity, and great elasticity. [26] Carbonbased fillers including MXene, [27][28][29] carbon nanotubes (CNT), [30][31][32] graphene, [24,[33][34][35] and carbon black (CB) are preferred candidates for their excellent photothermal and electrothermal performance. [32,36] He et al. combine the MS framework with MXene/silver nanowires (AgNWs) to design a thermal/electrical transmissive 3D network. [37] Triple-stimuli responsive shape memory composites are obtained by injecting an SMP into the hybrid framework by vacuum impregnation. Wu et al. prepare graphene nanoplatelet (GNP) hybrid-coated MS (CG@MS) incorporated with polyethylene glycol (PEG) to realize a notable photo/electrostimuli SME. [38] However, complicated and costly methods are challenging for large-scale production. [39][40][41][42][43] Meanwhile, the poor compatibility between the 3D porous framework and the functional fillers, as well as the inhomogeneous dispersion, also pose problems.An alternative method for constructing the 3D electrical/ thermal conductive network is to carbonize the MS. [44] The obtained carbon foams (CFs) actually become brittle or fragile after high-temperature carbonization. The conductivity and photothermal activity of the CFs are also not satisfactory for initiating SME at a safe voltage or realizing photothermal conversion efficiently. [45] Herein, we propose a specific multi-step carbonization protocol for transforming commercial MS to highly porous CF with robust resilience, excellent photothermal and electrothermal properties. Owing to the super-amphiphilicity of Highly porous multi-responsive shape memory foams have unique advantages in designing 3D materials with lightweight for varied applications. Herein, a facile and efficient approach to fabricating a thermo-, electro-, and photo-responsive shape memory composite foam is demonstrated. A specific multi-step carbonization protocol is adopted for transforming commercial melamine sponge (MS) to highly porous carbon foam (CF) with robust elastic resilience, efficient electrothermal/photothermal conversions, and superamphiphilicity. It is a novel proposal for CF to ta...

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“…In recent 5 years, the carbon-based nanomaterials have been widely used to construct smart fire warning sensors by means of their transformation of electric performance under high temperatures. The reported materials include graphene, carbon nanotubes, and Ti 3 C 2 MXene. − For example, Wang et al reported a fire-resistant cotton fabric (CF) that was coated with MXene nanosheets and carboxymethyl chitosan (CCS). Benefiting from the thermoelectric characteristic of the MXene nanosheet, MXene/CCS@CF triggered the fire alarm in 3.8 s upon exposure to the flame.…”

Section: Introductionmentioning

confidence: 99%

DNA-Modified Graphene Oxide Supported on a Fire-Resistant Hydroxyapatite Paper for Timely and Reliable Fire Warning

Chen

et al. 2023

ACS Appl. Nano Mater.

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The traditional fire alarm sensors suffer from sluggish fire warnings. Recently, graphene oxide (GO)-based sensors have attracted much attention due to their ultrafast fire warning. There are two major challenges: (i) the duration time of fire warning is short due to poor flame retardancy of GO and (ii) the response temperature of the GO sensor is high due to the abundant oxygen-containing groups. This work reports the single-stranded deoxyribonucleic acid (ssDNA)-modified GO supported on the hydroxyapatite (HA) nanowire paper. The ssDNA molecules have an action of intumescent flame retardancy, which effectively improves the flame retardancy of GO. Moreover, the thermal degradation of nitrogenous base of ssDNA causes nitrogen doping in GO. Concomitantly, the thermal reduction of GO is promoted, and some oxidative groups are removed. As a result, the period of fire warning of GO increases up to 180 s, and the response temperature decreases to as low as 159 °C. Besides, the HA paper with intrinsic fire resistance ensures the structural integrity of ssDNA–DNA in the flame, contributing to the steady working of the composite paper. This work highlights the critical roles of biomolecules and inorganic materials in synergistically regulating fire warning performance of GO.

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A Dual‐Function Sensor for Highly Sensitive Detection of Flame and Humidity

Cited by 24 publications

References 41 publications

Self-Healing and Freeze-Resistant Boat-Fruited Sterculia Seed Polysaccharide/Silk Fiber Hydrogel for Wearable Strain Sensors

Self-Healing and Freeze-Resistant Boat-Fruited Sterculia Seed Polysaccharide/Silk Fiber Hydrogel for Wearable Strain Sensors

Triple Stimuli‐Responsive Flexible Shape Memory Foams with Super‐Amphiphilicity

DNA-Modified Graphene Oxide Supported on a Fire-Resistant Hydroxyapatite Paper for Timely and Reliable Fire Warning

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