An Ultrahigh Sensitive Paper-Based Pressure Sensor with Intelligent Thermotherapy for Skin-Integrated Electronics

Abstract

Porous microstructure pressure sensors that are highly sensitive, reliable, low-cost, and environment-friendly have aroused wide attention in intelligent biomedical diagnostics, human–machine interactions, and soft robots. Here, an all-tissue-based piezoresistive pressure sensor with ultrahigh sensitivity and reliability based on the bottom interdigitated tissue electrode and the top bridge of a microporous tissue/carbon nanotube composite was proposed. Such pressure sensors exhibited ultrahigh sensitivity (≈1911.4 kPa−1), fast response time (<5 ms), low fatigue of over 2000 loading/unloading cycles, and robust environmental degradability. These enabled sensors can not only monitor the critical physiological signals of the human body but also realize electrothermal conversion at a specific voltage, which enhances the possibility of creating wearable thermotherapy electronics for protecting against rheumatoid arthritis and cervical spondylosis. Furthermore, the sensor successfully transmitted wireless signals to smartphones via Bluetooth, indicating its potential as reliable skin-integrated electronics. This work provides a highly feasible strategy for promoting high-performance wearable thermotherapy electronics for the next-generation artificial skin.

Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles

“…The squared correlation coefficient (R 2 ) of the Langmuir model was closer to 1, which was much higher than the R 2 of the Freundlich model. This phenomenon indicates that the process of Cr(VI) removal by Cu/Fe bimetallic nanoparticles is a monolayer adsorption, with Cr(VI) homogeneously distributed on the adsorption sites on the material surface 50 , 53 . The separation factor R L is an important parameter of the Langmuir model, defining by the following equation: where K L is the Langmuir constant (L mg −1 ), and C 0 is the initial concentration of Cr(VI) solution.…”

“…In our experiment, the values of R L with different initial Cr(VI) concentrations were close to zero and decreased with increasing initial concentrations. This indicated that the adsorption process was favorable, and there was a strong affinity between Cr(VI) ions and Cu/Fe bimetallic nanoparticles 43 , 53 .…”

A smart functional surfactant activated conductive polymer coated on paper with ultra-sensitive humidity sensing characteristics

“…However, the synthesized PANI can be further explored by stacking the multiple layers of the sensor, which could spontaneously form microstructure air gaps between the layers, forming a conductive network between the layers. Since we have explored PANI/SLS for humidity sensing performance using a single layer of the sensor, we restricted the investigation to a single sensor layer for pressure sensing [75][76][77]. The poor sensitivity of the sensor against different pressure conditions suggests excellent selectivity of the sensor for humidity sensing.…”

“…Since we have explored PANI/SLS for humidity sensing performance using a single layer of the sensor, we restricted the investigation to a single sensor layer for pressure sensing. [75][76][77] The poor sensitivity of the sensor against different pressure conditions suggests excellent selectivity of the sensor for humidity sensing. High sensitivity, selectivity, repeatability, lightweight, ease of fabrication, improved electrical properties and quick response along with low hysteresis could make the PANI/SLS coated paper sensor a potential material for humidity sensing application.…”

All Paper‐Based, Multilayered, Inkjet‐Printed Tactile Sensor in Wide Pressure Detection Range with High Sensitivity

“…Taehoon Lee, Yunsung Kang, Kwanhun Kim, Sangjun Sim, Kyubin Bae, Yeunjun Kwak, Wonkeun Park, Minhyeong Kim, and Jongbaeg Kim* DOI: 10.1002/admt.202100428 and supercapacitors [10] that apply the aforementioned properties of paper have been proposed and experimentally verified. Among various applications, paperbased tactile sensors that detect applied pressure have also garnered significant attention, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] regardless of their sensing principles based on changes in piezoresistivity, capacitance, and contact resistance. This is because paper can be utilized as a pressure-sensing structure owing to its high porosity and deformability.…”