Bioinspired Luminescent HOF‐Based Foam as Ultrafast and Ultrasensitive Pressure and Acoustic Bimodal Sensor for Human–Machine Interactive Object and Information Recognition

Abstract

Bionic sensors have extensively served smart robots, medical equipment, and flexible wearable devices. The luminescent pressure‐acoustic bimodal sensor can be treated as a remarkable, multifunctional, integrated bionic device. Here, a blue‐emitting hydrogen‐bonded organic framework (HOF‐TTA) as luminogen combines with melamine foam (MF), generating the flexible and elastic HOF‐TTA@MF (1 and 2) as a pressure–auditory bimodal sensor. In the luminescent pressure sensing process, 1 has excellent maximum sensitivity (132.02 kPa−1), low minimum detection limit (0.0 1333 Pa), fast response time (20 ms), high precision and great recyclability. 2 as a luminescent auditory sensor exhibits the highest response to the 520 Hz sound at 255−1453 Hz. In the process of sensing sound at 520 Hz, 2 possesses high sensitivity (1 648 441.3 cps Pa−1 cm−2), low detection limit (0.36 dB) and ultrafast response time (10 ms) within 11.47−91.77 dB. The sensing mechanisms toward pressure and auditory are analyzed in detail by finite element simulation. Furthermore, 1 and 2, as a human–machine interactive bimodal sensor, can recognize nine different objects and word information of “Health”, “Phone”, and “TongJi” with high accuracy and strong robustness. This work provides a facile fabricated method of luminescent HOF‐based pressure–auditory bimodal sensors and endows them with new recognition functions and dimensions.

Recent Progress in Wearable Near-Sensor and In-Sensor Intelligent Perception Systems

“…An electromagnetic material is a typical component of an auditory sensor with a high sensitivity and fast response. Additionally, high-sensitivity pressure sensor can be used as auditory sensors due to their ability to detect of micro vibrations [135][136][137][138]. Liu et al [139] designed a triboelectric nanogenerator (TENG) with an Au/fluorinated ethylene propylene (FEP) film/Kapton film for acoustic signal detection.…”

A selectively bimodal flexible sensor based on IL/SWCNTs/PEDOT:PSS nanocomposites for materials and shape recognition

“…8–11 However, flexible sensors and their derived arrays currently used still lack the ability to selectively detect multiple types of signals simultaneously, such as response to force and temperature with severe mutual interference, resulting in the very troublesome to effectively convert the mixed outputs into independent electrical signals unless they are decoupled via a bulk circuit processing system, which is unamiable for artificial equipment. 12–16 Therefore, there will be an urgent demand to fabricate multifunctional flexible tactile sensors, especially a single device, to accurately achieve multiple and independent sensing functions with low-coupling, further completing effective recognition of the target objects like human hands, which is of great significance for the lightweight and low-power consumption of intelligent equipment.…”

High-Performance Graphene Flexible Sensors for Pulse Monitoring and Human–Machine Interaction

“…In recent years, flexible pressure sensors have gradually integrated into modern life in medical health monitoring, − electronic skin, , and human–machine interaction. , Among them, flexible sensors are the best option for the next generation in a variety of wearable electronics due to their high sensitivity, − fast signal response, , low production cost, , and stable stability. , The sensing materials of flexible sensors are usually nanomaterials with excellent electrical conductivity, including nanoparticles, , carbon nanotubes, , graphene, − metal nanowires, and porous silicon . Among the aforementioned materials, graphene exhibits a number of advantageous properties, including high carrier mobility, excellent mechanical strength, high conductivity, and thermal properties.…”