Marine anti-fouling coatings represent an efficient approach to prevent and control the marine biofouling. However, a significant amount of antifouling agent is added to improve the static antifouling performance of the coatings, which leads to an issue whereby static antifouling performance conflicts with eco-friendly traits. Herein, this work reports an in situ reduction synthesis of silver nanoparticles (AgNPs) within polymers to produce composite coatings, aiming to solve the aforementioned issue. Firstly, urushiol-based benzoxazine monomers were synthesized by the Mannich reaction, using an eco-friendly natural product urushiol and n-octylamine and paraformaldehyde as the reactants. Additionally, AgNPs were obtained through the employment of free radicals formed by phenolic hydroxyl groups in the urushiol-based benzoxazine monomers, achieved by the in situ reduction of silver nitrate in benzoxazine. Then, the urushiol-based benzoxazine/AgNPs composite coatings were prepared by the thermosetting method. AgNPs exhibit broad-spectrum and highly efficient antimicrobial properties, with a low risk to human health and a minimal environmental impact. The composite coating containing a small amount of AgNPs (≤1 wt%) exhibits effective inhibition against various types of bacteria and marine microalgae in static immersion, thereby displaying outstanding antifouling properties. This organic polymer and inorganic nanoparticle composite marine antifouling coating, with its simple preparation method and eco-friendliness, presents an effective solution to the conflict between static antifouling effectiveness and environmental sustainability in marine antifouling coatings.

$P$ -poly(9, 9-diethylfluorene)/$n$ -silicon nanowire (SiNW) heterojunctions were prepared by spin coating $p$ -type conductive organic polymer on as-prepared $n\text{-}\mathrm{Si}\mathrm{NWs}$ , which were fabricated by electroless metal deposition method. This hybrid nanowire $p\text{-}n$ heterojunction shows good rectifying behavior with turn-on voltage of about $1\mathrm{V}$ at room temperature. Temperature-dependent current-voltage properties in the range of $253–413\mathrm{K}$ were investigated and they follow the standard $p\text{-}n$ heterojunction electron transport mechanism. The hybrid nanowire heterojunction shows good photovoltaic properties and good sensitivity toward visible light, and a responsivity of $3.23\mathrm{mA}∕\mathrm{W}$ under a reverse bias of $10\mathrm{V}$ was obtained. These results present potential applications in the future nanoelectronic and photonic devices based on organic and inorganic $p\text{-}n$ heterojunction arrays.