Abstract GaOOH/reduced graphene oxide (rGO) composites are investigated for UVC photodetection with a defect-controlled photoresponse. The morphology and crystallinity of GaOOH grown on rGO are strongly influenced by the Ga(NO3)3 concentration. Excess precursor induces GaOOH aggregation, reducing the effective GaOOH/rGO interfacial area and generating trap states in GaOOH. These traps act as recombination centers that shorten the carrier lifetime and suppress the photocurrent. The optimized 10% Ga(NO3)3 device shows the best performance, achieving a responsivity of 63.82 mA/W and an external quantum efficiency of 31%, about four times higher than the 30% sample and ∼220 times higher than previously reported GaOOH-based photodetectors....

Abstract The development of sustainable catalytic systems for biomass valorization is of great importance in the transition toward renewable energy and green chemical processes. In this study, a noble-metal-free Bi2O3-Cr2O3 catalyst supported on nitrogen-doped carbon nanotubes (N-CNT) was developed for the aerobic conversion of carbohydrates into 2,5-diformylfuran (DFF) using molecular oxygen as the oxidant. The catalytic system enables a direct one-pot transformation of fructose and sucrose to DFF without intermediate isolation, achieving yields of 68.2% and 51.6%, respectively, under optimized conditions (160 °C, 12 h, O2 atmosphere). The enhanced catalytic performance is attributed to the synergistic interaction between Bi2O3 and Cr2O3, which promotes oxygen activation...