David

Wearable pressure sensors, which can perceive and respond to environmental stimuli, are essential components of smart textiles. Here, large-area all-textile-based pressure-sensor arrays are successfully realized on common fabric substrates. The textile sensor unit achieves high sensitivity (14.4 kPa⁻¹), low detection limit (2 Pa), fast response (≈24 ms), low power consumption (<6 µW), and mechanical stability under harsh deformations. Thanks to these merits, the textile sensor is demonstrated to be able to recognize finger movement, hand gestures, acoustic vibrations, and real-time pulse wave. Furthermore, large-area sensor arrays are successfully fabricated on one textile substrate to spatially map tactile stimuli and can be directly incorporated into a fabric garment for stylish designs without sacrifice of comfort, suggesting great potential in smart textiles or wearable electronics.

Large-area all-textile pressure-sensor arrays are successfully fabricated on a woven fabric substrate for monitoring human motion and personal healthcare. High sensitivity, excellent mechanical flexibility, low detection limit, and power consumption are achieved for applications in wearable electronics or smart textiles.

The evolution of nanomorphology in printed polymeric electrodes is investigated by in situ grazing-incidence wideangle X-ray scattering (in situ GIWAXS). The effect of solvent additives on the PEDOT:PSS film-formation process is analyzed. In situ and static GIWAXS measurements show how co-solvent additives influence conducting polymers in terms of interchain coupling, molecular orientation, and crystallite size.

Stable graphene oxide monoliths (GOMs) have been fabricated by exploiting epoxy groups on the surface of graphene oxide (GO) in a ring opening reaction with amine groups of poly(oxypropylene) diamines (D₄₀₀). This method can rapidly form covalently bonded GOM with D₄₀₀ within 60 s. FTIR and XPS analyses confirm the formation of covalent C-N bonds. Investigation of the GOM formation mechanism reveals that the interaction of GO with a diamine cross-linker can result in 3 different GO assemblies depending on the ratio of D₄₀₀ to GO, which have been proven both by experiment and molecular dynamics calculations. Moreover, XRD results indicate that the interspacial distance between GO sheets can be tuned by varying the diamine chain length and concentration. We demonstrate that the resulting GOM can be moulded into various shapes and behaves like an elastic hydrogel. The fabricated GOM is non-cyctotoxic to L929 cell lines indicating a potential for biomedical applications. It could also be readily converted to graphene monolith upon thermal treatment. This new rapid and facile method to prepare covalently cross-linked GOM may open the door to the synthesis and application of next generation multifunctional 3D graphene structures.

An ultrafast cross-linking method for the fabrication of graphene oxide monoliths (GOM) with poly(oxypropylene) diamines as a cross-linker is reported. This method can form self-assembled 3D GO structures with controllable interlayer spacing. The covalently bonded GOM structure demonstrates high cell viability, could be molded into various shapes, and when hydrated behaves like an elastic hydrogel.