Speech recognition often relies on visual stereo images and videos, but it is often limited by light intensity and opaque occlusions such as mask (the coronavirus disease 2019 (COVID-19) pandemic)....
Flexible surface-enhanced Raman scattering (SERS) substrates
offer
advantages over traditional rigid substrates for efficient extraction
of target molecules from complex surfaces, which is critical for technical
applications ranging from pesticide residue analysis to environmental
pollutant monitoring and forensic science detection. Herein, flexible
sandwich-structured silver nanowires with laser-induced graphene and
polydimethylsiloxane (PDMS) (Ag NWs@LIG@PDMS) with high SERS activity,
flexibility, and stability were prepared by a simple method. Its detection
limit is as high as 10–14 M, which is significantly
higher than that of silver nanowires embedded in PDMS (Ag NWs/PDMS)
and silver nanowire adhesive PDMS (Ag NWs@PDMS) with bilayer structure,
due to the efficacy of interlayer laser-induced graphene (LIG). Moreover,
compared with similar structures, the sophisticated structural design
of silver nanowires with laser-induced graphene embedded in PDMS (Ag
NWs/LIG@PDMS) enables higher SERS activity. Apart from this, the Ag
NWs@LIG@PDMS film maintains excellent SERS performance even under
10% tensile deformation and extreme operating temperature (−80
to 80 °C). In view of the above-mentioned advantages, SERS substrates
have been successfully used for fast, efficient, low-cost, and nondestructive
extraction and detection of peel surface and fingerprint residues
in real scenes, providing avenues for molecular trace extraction and
detection in food safety and forensics science.
Flexible strain sensors with highly similar effects to human skin have been given great attention due to their potential application in personal health monitoring, human–computer interaction systems and artificial electronic skin fields. In particular, the self-healing properties of the sensors are important for their long-term and repeated use during the actual operation. Herein, a flexible strain sensor with complete self-healing function is proposed by combining self-healable PDMS film with rich hydrogen bonds and conductive ink based on recoverable liquid metal. By adjusting the contents of different components of self-healing PDMS film and the relative mass fraction of the liquid metal ink in the strain sensor, the tensile stress and resistance of flexible sensor can be changed to match different usage scenarios. The sensor can achieve a maximum tensile stress of 0.83 MPa and an elongation at break of 843%. After self-healing for 24 h at room temperature, its tensile stress can revert to 82% of the original value, while the electrical connection can instantaneously recover to initial situation after fracture surface contacts. This hints its potential advantage as wearable sensors for motion monitoring of the human body and developable applications in medical monitoring, recyclable electronics and artificial skin.
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