Approaching intrinsic dynamics of MXenes hybrid hydrogel for 3D printed multimodal intelligent devices with ultrahigh superelasticity and temperature sensitivity

Abstract

Hydrogels are investigated broadly in flexible sensors which have been applied into wearable electronics. However, further application of hydrogels is restricted by the ambiguity of the sensing mechanisms, and the multi-functionalization of flexible sensing systems based on hydrogels in terms of cost, difficulty in integration, and device fabrication remains a challenge, obstructing the specific application scenarios. Herein, cost-effective, structure-specialized and scenario-applicable 3D printing of direct ink writing (DIW) technology fabricated two-dimensional (2D) transition metal carbides (MXenes) bonded hydrogel sensor with excellent strain and temperature sensing performance is developed. Gauge factor (GF) of 5.7 (0 − 191% strain) and high temperature sensitivity (−5.27% °C−1) within wide working range (0 − 80 °C) can be achieved. In particular, the corresponding mechanisms are clarified based on finite element analysis and the first use of in situ temperature-dependent Raman technology for hydrogels, and the printed sensor can realize precise temperature indication of shape memory solar array hinge.

High-Sensitivity GNPs/PDMS Flexible Strain Sensor with a Microdome Array

“…In recent years, flexible sensors have increasingly become research hotspots. They have important applications in flexible wearable electronic devices, electronic skin, robotics, medical diagnosis, and other fields. − Most conventional strain sensors have either a narrow sensing range or low sensitivity . Therefore, how to improve the sensitivity and reliability of flexible strain sensors while simplifying the fabrication process and reducing the cost has always been a problem of interest to scholars.…”

Ferroelectric LaxFe0.1–x Codoped ZnO Nanorod Triboelectric Nanogenerators for Electrochemical Rhodamine B Degradation

“…Known from previous works, the dielectric properties of friction layers have great impacts on the output performance of TENG. Various measures have been adopted to improve the dielectric constant of the friction layers and further enhance the output performance, such as reasonable selection in tribo-materials, injection into the surface of electric charges, mosaic of high dielectric materials in polymer matrix, − and so on. Especially, the ferroelectric with spontaneous polarization has a high dielectric constant, and it has been used in the TENGs to enhance the output performance. , Chai et al increased the triboelectric charge density from 17.50 to 105.70 μC/m 2 by using the conductive interlayer modulated by ferroelectric nanocomposites as the negative friction materials, and the corresponding peak power density was also increased from 0.11 to 7.21 W/m 2 .…”

Ultrafine Rh nanocrystals immobilized on 3D boron and nitrogen co-doped graphene–carbon nanotube networks: high-efficiency electrocatalysts towards the methanol oxidation reaction

“…Confronting the rising energy prices and serious environmental degradation, great efforts have been devoted to the development of various advanced energy and environmental technologies. [1][2][3][4] Direct methanol fuel cells (DMFCs), as a green power generation device that can directly convert chemical energy into electrical energy, play an increasingly important role in daily life. 5,6 In particular, DMFCs have been considered to be a very promising power source in the fields of portable electronic devices, electric vehicles, and aerospace crafts because of their high energy conversion efficiency, wide working temperature range, environmental friendliness, and structural safety.…”