High‐performance flexible sensing devices based on polyaniline/MXene nanocomposites

Abstract

Highly active two‐dimensional (2D) nanocomposites, integrating the unique merits of individual components and synergistic effects of composites, are greatly desired for flexible sensing device applications. Although 2D transition metal carbides and nitrides (MXenes) combined with their high metallic conductivity and versatile surface chemistry have shown its huge potential for sensing reactions, it still remains a major challenge to construct functional materials with intriguing sensing performance at room temperature (RT). Herein, we used an integration of density functional theory (DFT) simulations and bulk electrosensitive measurements to show high electrocatalytic sensitivity of polyaniline/MXene (PANI/Ti3C2T x) nanocomposites. Thanks to the synergistic properties of nanocomposites and high catalytic/absorption capacity of Ti3C2T x MXene, PANI nanoparticles are rationally decorated on Ti3C2T x nanosheet surface via in situ polymerization by low temperature approach to induce remarkable detection sensitivity, rapid response/recovery rate, and mechanical stability at RT. This study offers a versatile platform to use MXenes to fabricate 2D nanocomposites materials for high‐performance flexible gas sensors.

Environmentally Robust Memristor Enabled by Lead‐Free Double Perovskite for High‐Performance Information Storage

“…We performed X‐ray diffraction (XRD) pattern tests of our devices, and the crystal structure is found to persist under various harsh conditions (Figure S17, Supporting Information). Such stability allows our devices to work in harsh environments, where most perovskite‐based devices fail to work …”

“…Recently, organic–inorganic lead halide perovskites (APbX 3 , A = organic cations, X: halide ions) have gradually attracted fundamental interest for use in not only photovoltaics and photoelectronics but also memristors, which is attributed to their mixed electronic‐ionic properties . Hybrid lead perovskites are highly defect‐tolerant and thus solution‐processable, rendering their fabrication procedure quite facile and cost‐effective .…”

MXenes and Their Applications in Wearable Sensors

“…The sensor exhibited high sensitivity, good flexibility, and wide sensing range. Zhao et al (2019) utilized polyaniline (PANI) decorated on Ti 3 C 2 T x nanosheet surface via in situ polymerization at low temperature for a PANI/Ti 3 C 2 T x composite. The synergistic properties of composites and highly active Ti 3 C 2 T x endow the sensing material both high ethanol sensitivity (41.1%, 200 ppm) and rapid response/recovery time (0.4/0.5 s) at room temperature.…”

Highly Sensitive and Flexible Pressure Sensor Prepared by Simple Printing Used for Micro Motion Detection

“…The synergistic effect between the Ni NPs, COOH‐MWCNTs, and PANI is obtained to achieve high conductivity, and guar gum is added for adjusting viscosity of paste. The design of this conductive paste which the conductivity is 0.47 S m −1 are based on following reasons: I) The COOH functional groups of MWCNTs can greatly improve its dispersibility; II) PANI has a high specific surface area, multiple oxidation states, doped states, and can rapidly undergo reversible redox reactions, the sensor based on PANI has a fast response time; III) Ni NPs have the merits of low price and high electrical conductivity, which are widely applied to the areas such as sensing . And the prepared paste is printed on one side of the fabric by magnetic screen printing machine.…”