期刊
ACS NANO
卷 16, 期 11, 页码 19305-19318出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c08760
关键词
liquid metal; EGaIn; PEDOT; PSS; electric field; noncontact sensing
类别
资金
- National Natural Science Foundation of China
- [51972064]
Electric field-based noncontact flexible electronics (EF-NFEs) enable noncontact human-machine interactions, but current technologies lack high spatial resolution. This study introduces a versatile material, Ga-PP, for EF-NFE devices with high spatial resolution. Ga-PP, composed of EGaIn and PEDOT:PSS, improves electron storage and sensing ability. It shows outstanding performance in noncontact sensing and can even monitor movement signals of athletes in water. Ga-PP can also be used to construct noncontact sensing conductive circuits, showing potential for smart electronics integration.
Electric field-based noncontact flexible electronics (EF-NFEs) allow people to communicate with intelligent devices through noncontact human-machine interactions, but current EF-NFEs with limited detections (usually <20 cm) distance often lack a high spatial resolution. Here, we report a versatile material for preparing EF-NFE devices with a high spatial resolution to realize everyday human activity detection. Eutectic gallium-indium alloy (EGaIn) was introduced into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) chains to fabricate this material, named Ga-PP. The introduction of EGaIn successfully regulates the intra-and interchain interactions of PEDOT chains and thus increases the pi-electron accumulation on GaPP chains, which facilitates improvement of the electron storage of Ga-PP and its noncontact sensing ability. The water solubility of the obtained Ga-PP can reach approximately 15 mg/mL, comparable to that of commercial PEDOT:PSS, thus making Ga-PP suitable for various design strategies to prepare EF-NFE devices. We demonstrate that a conductive textile with a noncontact sensing ability can be achieved by immersing a commercial silk fabric into a Ga-PP solution for 5 min. With a detection distance exceeding 1 m, the prepared Ga-PP-based conductive textile (Ga-PP-CT) possesses outstanding noncontact sensing sensitivity, showing advantages in tracing the locations of signal sources and distinguishing motion states. Surprisingly, even when placed in water, Ga-PP-CT can be used to monitor the movement signals of athletes in different sporting events and output specific noncontact response signals for different sports. Intriguingly, the Ga-PP solution itself can be used to construct noncontact sensing conductive circuits, displaying the potential to be incorporated into smart electronics.
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