Self-assembled core-shell structured organic nanofibers fabricated by single-nozzle electrospinning for highly sensitive ammonia sensors

Electrospinning is a unique method to prepare 1-dimentional nanofiber for largescalemanufacturing. Here in, we demonstrated chemical sensors based on thesemiconducting nanofibers with core-shell structure by simple single-nozzleelectrospinning with the spontaneous phase separation. The core-shell structurenanofiber has large active sites which make it highly sensitive to chemical analytes.The thickness of the sensing shell can be tuned by controlling the mass ratio ofcore and shell components. As a demonstration, the nanofiber-based sensorexhibits high sensitivity to low-concentration ammonia (ppb level), as well as stabilityand reversibility. This unique fast single-nozzle electrospinning techniqueused to fabricate semiconducting nanofibers with core-shell structure provides afacile and designable process for the integration of multifunctional organic semiconductinglayer into the organic electronic system.

SrTiO_(3)-CaCr_(0.5)Nb_(0.5)O_(3) solid solutions as p-type photocatalysts for Z-scheme water splitting under visible light illumination

P-type semiconductivity has been observed in solid solution series(SrTiO_(3))_(1-x)(CaCr_(0.5)Nb_(0.5)O_(3))x(0.0≤x≤0.15),which all adopt cubic symmetry and own intense absorption in the visible light region.These solid solutions are superior H2 evolution photocatalysts under visible light illumination(λ≥400 nm).An AQE as high as 1.02%at 420±20 nm has been achieved at optimal composition(SrTiO_(3))_(0.85)(CaCr_(0.5)Nb_(0.5)O_(3))0.15 which significantly surpasses the parent compounds.Stoichiometric H_(2)/O_(2) production under visible light illumination has been successfully realized using Z-scheme system containing(SrTiO_(3))_(0.85)(CaCr_(0.5) Nb_(0.5) O_(3))_(0.15),WO_(3) and I^(-)/IO_(3)^(-)redox couple.