Integrating the advantages of ultrahigh sensitivity, good breathability, low-cost and large-area fabrication processes, and facile integration with other functional devices is full of challenges for wearable pressure sensors. Here, a novel all-fabric piezoresistive pressure sensor is designed with a bottom interdigitated textile electrode screen-printed using silver paste and a top bridge of AgNW-coated cotton fabric. The entire fabrication process is facile, economical and suitable for large-scale integrated production. Benefiting from the highly porous microstructure, large surface roughness and ultra-low resistance of the conductive fabric, our piezoresistive pressure sensors show excellent detection performance, including an extra-high sensitivity of 2.46 × 10⁴ kPa⁻¹ to 5.65 × 10⁵ kPa⁻¹ over a wide pressure regime (0–30 kPa), a giant on/off ratio of ≈10⁶, a fast response time (6 ms), and a low detection limit (0.76 Pa). Thanks to these merits, the devices not only have the ability to detect various tiny signals of the human body, but also can be widely applied in a human–computer interactive system as a real wearable sensor platform, which was demonstrated by playing the piano and computer games.

A water-based AgNW ink for large-scale flexible transparent conductive films was developed via a systematic research procedure.

Molybdenum (Mo) doped BiVO₄ was fabricated via a simple electrospun method. Morphology, structure, chemical states and optical properties of the obtained catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), N₂ adsorption–desorption isotherms (BET) and photoluminescence spectrum (PL), respectively. The photocatalytic properties indicate that doping Mo into BiVO₄ can enhance the photocatalytic activity and dark adsorption ability. The photocatalytic test suggests that the 1% Mo-BiVO₄ shows the best photocatalytic activity, which is about three times higher than pure BiVO₄. Meanwhile, 3% Mo-BiVO₄ shows stronger dark adsorption than pure BiVO₄ and 1% Mo-BiVO₄. The enhancement in photocatalytic property should be ascribed to that BiVO₄ with small amount of Mo doping could efficiently separate the photogenerated carries and improve the electronic conductivity. The high concentration doping would lead the crystal structure transformation from monoclinic to tetragonal phase, as well as the formation of MoO₃ nanoparticles on the BiVO₄ surface, which could also act as recombination centers to decrease the photocatalytic activity.

Thermally activated delayed fluorescence (TADF) dendrimers have received much attention in solution-processed non-doped organic light-emitting diodes. However, the study of their application as self-host materials in white organic light-emitting diodes (WOLEDs) is quite limited. In this contribution, solution-processed small-molecule WOLEDs were obtained by employing a newly designed blue TADF dendrimer bis(4-(3,6-bis(3,6-di-tert-butylcarbazol-N-yl) carbazole)phenyl)sulfone (G2) with a wide bandgap and a high triplet energy (3.0 eV) as the host and the blue-light-emitting material, combined with an orange iridium complex (bis(2-phenylbenzothiazolato) (acetylacetonate)iridium(III)) (Ir(bt)₂(acac)) as the dopant. The devices achieved a maximum external quantum efficiency of 10.1%, a maximum current efficiency of 17.69 cd A⁻¹ and CIE coordinates of (0.32, 0.33). They also exhibited stable electroluminescence spectra and low efficiency roll-off at a relatively high current density. These improved performances benefit from the advantages of the TADF dendrimer used as the host material. More importantly, the fast rate constant of Förster resonance energy transfer (K_ET > 10⁷ s⁻¹) suppressed intersystem crossing (ISC) on the G2 host from singlet to triplet states, leading to a reduced singlet density and suppressed singlet–triplet annihilation on the G2 host. Therefore, these results indicate that TADF dendrimers have a promising prospect in the application of high-performance solution-processed two complementary color WOLEDs.

Hierarchical micro-mesoporous carbon (denoted as HPC-2 in this study) was synthesized by pre-carbonization of biomass Sichuan pepper followed by KOH activation. It possessed well-developed porosity with the specific surface area of 1823.1 m² g⁻¹ and pore volume of 0.906 cm³ g⁻¹, and exhibited impressive supercapacitive behaviors. For example, the largest specific capacitance of HPC-2 was tested to be ca. 171 F g⁻¹ in a three-electrode setup with outstanding rate capability and stable electrochemical property, whose capacitance retention was near 100% after cycling at rather a high current density of 40 A g⁻¹ for up to 10,000 cycles. Furthermore, a two-electrode symmetric supercapacitor cell of HPC-2//HPC-2 was constructed, which delivered the maximum specific capacitance and energy density of ca. 30 F g⁻¹ and 4.2 Wh kg⁻¹, respectively, had prominent rate performance and cycling stability with negligible capacitance decay after repetitive charge/discharge at a high current density of 10 A g⁻¹ for over 10,000 cycles. Such electrochemical properties of HPC-2 in both three- and two-electrode systems are superior or comparable to those of a great number of porous biomass carbon reported previously, hence making it a promising candidate for the development of high-performance energy storage devices.

As a synthetic renewable and biodegradable material, the application of polylactide (PLA) in the green flexible electronics has attracted intensive attention due to the increasingly serious issue of electronic waste. Unfortunately, the development of PLA-based optoelectronic devices is greatly hindered by the poor heat resistance and mechanical property of PLA. To overcome these limitations, herein, we report a facile and promising route to fabricate silver nanowires/PLA (AgNW/PLA) film with largely improved properties by utilizing the stereocomplex (SC) crystallization between poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA). Through embedding the AgNW networks into the PLLA:PDLA blend matrix via a transfer method, the AgNW/PLLA:PDLA film with both high transparency and excellent conductivity was obtained. Compared with the AgNW/PLLA film, the formation of SC crystallites in the composites matrix could significantly enhance not only heat resistance but also mechanical strength of the AgNW/PLLA:PDLA film. Exceptionally, the AgNW/PLLA:PDLA film exhibited superior flexibility and could maintain excellent electrical conductivity stability even under the condition of 10,000 repeated bending cycles and 100 tape test cycles. In addition, the organic light-emitting diodes (OLEDs) with the AgNW/PLLA:PDLA films as electrodes were successfully fabricated in this work for the first time and they exhibited highly flexible, luminous, as well as hydrolytic degradation properties. This work could provide a low-cost and environment-friendly avenue towards fabricating high-performanced PLA-based biodegradable electronics.