Liquid‐Metal‐Based Stretchable Dual‐Parameter Sensor for Simultaneous Detection of Deformation and Temperature

Abstract

Multiparameter sensors that can individually monitor mechanical and thermal signals from multiple stimuli have attracted immense attention. Due to interferences caused by signal crosstalk, it is a challenge for multiparameter sensors to simultaneously differentiate mechanic and thermal stimuli within a broad working range. Herein, a liquid‐metal‐based stretchable dual‐parameter sensor that can simultaneously detect deformation (0–4.5 mm) and temperature (0–60 °C) is fabricated. The sensor adopts a multilayer structure in which a capacitive deformation‐sensing unit is stacked on top of a resistive temperature‐sensing unit. The deformation unit possesses excellent linear responses (R2 = 0.999) and ultralow detection limit (0.04 mm, ≈0.02%). Attributed to these merits, the deformation unit can be used to monitor physiological actions (e.g., finger bending, swallowing, and speaking). The temperature unit exhibits strong stability under multiple stimuli. With the cooperation of the two units, the dual‐parameter sensor can accurately differentiate deformation and temperature stimuli with an average error of 0.04 mm and 0.82 °C. Because of these remarkable performances, the sensor can achieve real‐time acquisition of the deformation and temperature change during finger movements. The dual‐parameter sensing abilities of the sensor indicate its promising potential in human motion monitoring and wearable devices.

The low temperature liquid metal pressure sensors

“…In addition, table 9 shows the comparison of the performance of the present liquid metal sensors in this work with the previous liquid metal sensors in the literature [21,28,30,40,41]. It is found from table 9 that the present sensor in this work can work at low temperature, and it still maintains good working performance in low temperature environment.…”

Biphasic Liquid Metal Composite for Strain Sensor with High Stretchability and Sensitivity

“…In contrast, in the case of the pure LM-based sensor without Ni microparticles, because the pure LM can deform and can retain its conductive percolation with the applied stretch, the rise in the resistance originates only from the dimension change. [55,56] In addition, Table 2 shows the comparison of the performance of the LMN composite-based sensor in this work and in the literatures. [29,[57][58][59][60][61][62][63][64] It is found from Table 2 that for the sensor in this work, the addition of Ni microparticles in the LM matrix enables the LMN composite-based sensors to have high sensitivity and large stretchability.…”

Micro‐Casting/Assembly Technology Based on Bismuth‐Based Liquid Metal

“…Room-temperature liquid metals offers their unique advantages in preparation. Recently, gallium-based [8][9][10][11] and bismuth-based [12][13][14] alloys are very popular room temperature liquid metal for all kinds of applications. The absence of additional heating allows for easier operation in a more convenient experimental environment, making production costs much lower.…”