South China University of Technology

About: South China University of Technology is a education organization based out in Guangzhou, China. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 62343 authors who have published 69468 publications receiving 1251592 citations. The organization is also known as: SCUT & Huánán Lǐgōng Dàxué.

Microfiber-based few-layer black phosphorus saturable absorber for ultra-fast fiber laser

Abstract: Few-layer black phosphorus (BP), as the most alluring graphene analogue owing to its similar structure as graphene and thickness dependent direct band-gap, has now triggered a new wave of research on two-dimensional (2D) materials based photonics and optoelectronics However, a major obstacle of practical applications for few-layer BPs comes from their instabilities of laser-induced optical damage Herein, we demonstrate that, few-layer BPs, fabricated through the liquid exfoliation approach, can be developed as a new and practical saturable absorber (SA) by depositing few-layer BPs with microfiber The saturable absorption property of few-layer BPs had been verified through an open-aperture z-scan measurement at the telecommunication band and the microfiber-based BP device had been found to show a saturable average power of ~45 mW and a modulation depth of 109%, which is further confirmed through a balanced twin detection measurement By further integrating this optical SA device into an erbium-doped fiber laser, it was found that it can deliver the mode-locked pulse with duration down to 940 fs with central wavelength tunable from 1532 nm to 1570 nm The prevention of BP from oxidation through the 'lateral interaction scheme' owing to this microfiber-based few-layer BP SA device might partially mitigate the optical damage problem of BP Our results not only demonstrate that black phosphorus might be another promising SA material for ultrafast photonics, but also provide a practical solution to solve the optical damage problem of black phosphorus by assembling with waveguide structures such as microfiber

Size effect of Pt nanoparticles on the catalytic oxidation of toluene over Pt/CeO2 catalysts

Abstract: The present work elucidated the size effect of Pt nanoparticles on the activity of Pt/CeO2 catalysts toward catalytic oxidation of toluene. Size-controllable Pt nanoparticles, ranging from 1.3 to 2.5 nm, were successfully loaded on CeO2 nanorod support by the adsorption method. The structure and chemical properties of Pt/CeO2 catalysts are much dependent on Pt particle size. As size increases, the Pt dispersion declines while more Pt-O Ce bonds, Ce3+ and oxygen vacancies exist on ceria. The catalytic activity test of toluene oxidation shows that Pt/CeO2-1.8 sample exhibits the best catalytic performance due to the balance of both Pt dispersion and oxygen vacancy concentration of ceria. Three types of TOFs values based on Pt dispersion, oxygen vacancy concentration and both of them are calculated respectively, and the result demonstrates that the reaction rate is controlled by both of the exposed Pt atom and oxygen vacancies. In addition, the Pt/CeO2-1.8 catalyst could work properly for 120 h with various inlet toluene concentration and be completely negligible for 5 vol% water vapour at 155 °C.