Porous Pure MXene Fibrous Network for Highly Sensitive Pressure Sensors

Abstract

Wearable and elastic pressure sensors have caused widespread concern due to the popularity of smart terminals and human health monitoring. To obtain a flexible pressure sensor with a wide detection region and outstanding sensitivity, exploring new materials and novel structures has become the first choice for the research. Here, a wearable and flexible MXene fibrous network pressure sensor (MFNS) with a high sensitivity and wide detection region is reported. The holistic fiber network is composed of pure MXene fibers; among them, MXene fibers were prepared by wet-spinning of MXene nanosheets. The MFNS exhibits a high sensitivity in a wide detection region (51 kPa −1 for 14.7 kPa and 427 kPa −1 within the 14.7−19.9 kPa range), a low detection limit (8 Pa), a robust durability (10,000 cycles), and a prompt response (95 ms). Due to the superior performance of MFNS, it also proves prospective applications for human motion signal detection (such as swallowing, pulse beat, and joint motion) and measuring pressure distribution. This work provides an effective way to fabricate a high-performance pressure sensor for human−machine interactions, personal healthcare monitoring, and multitouch devices.

Tunable Ti3C2Tx MXene-Derived TiO2 Nanocrystals at Controlled pH and Temperature

“…MXenes are a family of 2D transition-metal carbides, nitrides, and carbonitrides with the general formula of M n +1 X n T x (T x ; surface functional group: O, −OH, or −F, and n = 1, 2, 3, 4), where M, X, and T x represent a transition metal, carbon and/or nitrogen, and surface terminations (such as −OH, O, and −F), respectively. − Among many possible combinations of each component, Ti 3 C 2 T x has been the most representative MXene for its accessibility and high electrical conductivity. − …”

A high-performance wearable pressure sensor based on an MXene/PVP composite nanofiber membrane for health monitoring

“…2(c)) indicate the hexagonal lattice characteristics of the MXene nanosheet, which is consistent with other reported studies. 40,41 Fig. 2(d) shows the FESEM image of the f(MXene)/ PVP (f ¼ 0.1 wt%) CNM, where the brous scaffolds appear intertwined, forming a ber network.…”

Flexible Multimodal Sensors Based on Fibrous Porous Networks of Multiwalled Carbon Nanotubes and Polydimethylsiloxane for Sensing and Distinguishing Vertical and Shear Force

“…The sensitive layer in the flexible piezoresistive pressure sensor is composed of composite structures which combine conductive materials with flexible matrix like polymers and fibers. Most commonly adopted conductive materials include metal nanowires, reduced graphene oxide (RGO), carbon nanotubes (CNTs), and two-dimensional transition metal carbonitrides (MXene). , The flexible matrix combined to form the sensitive layer that generally involves polydimethylsiloxane (PDMS), polyurethane (PU), and polyimide (PI) . Upon loading external force, the sensitive layer can be compressed, stretched, or twisted, causing a variation in the resistivity of the sensitive layer originating from the spatial redistribution of the conductive substance and the flexible matrix inside the composite.…”