Controlled synthesis of hierarchically assembled titanium dioxide （TiO2） nano- structures is important for practical applications in environmental purification and solar energy conversion. We present here the fabric...Controlled synthesis of hierarchically assembled titanium dioxide （TiO2） nano- structures is important for practical applications in environmental purification and solar energy conversion. We present here the fabrication of interconnected TiO2 nanotubes as a macroscopic bulk material by using a porous carbon nanotube （CNT） sponge as a template. The basic idea is to uniformly coat an amorphous titania layer onto the CNT surface by the infiltration of a TiO2 precursor into the sponge followed by a subsequent hydrolysis process. After calcination, the CNTs are completely removed and the titania is simultaneously crystallized, which results in a porous macrostructure composed of interconnected anatase TiO2 nanotubes. The TiO2 nanotube macrostructures show comparable photocatalytic activities to commercial products （AEROXIDE TiO2 P25） for the degradation of rhodamine B （RhB）. Moreover, the TiO2 nanotube macrostructures can be settled and separated from water within 12 h after photocatalysis, whereas P25 remains suspended in solution after weeks. Thus the TiO2 nanotube macrostructures offer the advantage of easy catalyst separation and recycle and can be a promising candidate for wastewater treatment.展开更多
Advances in neural electrode technologies can have a significant impact on both fundamental and applied neuroscience. Here, we report the development of flexible and biocompatible neural electrode arrays based on a na...Advances in neural electrode technologies can have a significant impact on both fundamental and applied neuroscience. Here, we report the development of flexible and biocompatible neural electrode arrays based on a nanopaper substrate. Nanopaper has important advantages with respect to polymers such as hydrophilicity and water wettability, which result in significantly enhanced biocompatibility, as confirmed by both in vitro viability assays and in vivo histological analysis. In addition, nanopaper exhibits high flexibility and good shape stability. Hence, nanopaper-based neural electrode arrays can conform to the convoluted cortical surface of a rat brain and allow stable multisite recording of epileptiform activity in vivo. Our results show that nanopaper-based electrode arrays represent promising candidates for the flexible and biocompatible recording of the neural activity.展开更多
Photomultiplication(PM)type all-polymer photodetectors(all-PPDs)are first demonstrated with the sandwich structure of ITO/PEDOT:PSS/PBDB-T:PZ1(100:x,wt/wt)/Al.The optimal PM type all-PPDs with PBDB-T:PZ1(100:3,wt/wt)a...Photomultiplication(PM)type all-polymer photodetectors(all-PPDs)are first demonstrated with the sandwich structure of ITO/PEDOT:PSS/PBDB-T:PZ1(100:x,wt/wt)/Al.The optimal PM type all-PPDs with PBDB-T:PZ1(100:3,wt/wt)as active layers exhibit external quantum efficiency(EQE)of>100%in the spectral range from 310 to 790 nm.Under 675 nm light illumination,the champion EQE value arrives to 1,470%at-20 V bias and the specific detectivity approaches 1×10^12 Jones at-10 V bias.The PM phenomenon in all-PPDs results from hole tunneling injection assisted by interfacial band bending induced by trapped electrons in PZ1 near Al electrode.The EQE values of optimal PM type all-PPDs still remained over 90%of the original value after 60 d of the storage in a high-purity nitrogen-filled glove box.展开更多
文摘Controlled synthesis of hierarchically assembled titanium dioxide （TiO2） nano- structures is important for practical applications in environmental purification and solar energy conversion. We present here the fabrication of interconnected TiO2 nanotubes as a macroscopic bulk material by using a porous carbon nanotube （CNT） sponge as a template. The basic idea is to uniformly coat an amorphous titania layer onto the CNT surface by the infiltration of a TiO2 precursor into the sponge followed by a subsequent hydrolysis process. After calcination, the CNTs are completely removed and the titania is simultaneously crystallized, which results in a porous macrostructure composed of interconnected anatase TiO2 nanotubes. The TiO2 nanotube macrostructures show comparable photocatalytic activities to commercial products （AEROXIDE TiO2 P25） for the degradation of rhodamine B （RhB）. Moreover, the TiO2 nanotube macrostructures can be settled and separated from water within 12 h after photocatalysis, whereas P25 remains suspended in solution after weeks. Thus the TiO2 nanotube macrostructures offer the advantage of easy catalyst separation and recycle and can be a promising candidate for wastewater treatment.
基金We thank Prof. Qingfei Liu from School of Pharmaceutical Sciences in Tsinghua University for his kind help in cellulose homogenization. We thank Yuchen Lin for his help in AFM analysis. Y. F. thanks to the support from the National Natural Science Foundation of China （Nos. 21673057 and 31600868） and Beijing Science and Technology Program （No. Z161100002116010）. H. B. L. thanks to the support from BOE Technology Group Co., Ltd. under the project of nanopaper-based multifunctional flexible sensors and the National Key R＆D Program of China （No. 2017YFF0209901）.
文摘Advances in neural electrode technologies can have a significant impact on both fundamental and applied neuroscience. Here, we report the development of flexible and biocompatible neural electrode arrays based on a nanopaper substrate. Nanopaper has important advantages with respect to polymers such as hydrophilicity and water wettability, which result in significantly enhanced biocompatibility, as confirmed by both in vitro viability assays and in vivo histological analysis. In addition, nanopaper exhibits high flexibility and good shape stability. Hence, nanopaper-based neural electrode arrays can conform to the convoluted cortical surface of a rat brain and allow stable multisite recording of epileptiform activity in vivo. Our results show that nanopaper-based electrode arrays represent promising candidates for the flexible and biocompatible recording of the neural activity.
基金supported by the Fundamental Research Funds for the Central Universities (2019YJS207)
文摘Photomultiplication(PM)type all-polymer photodetectors(all-PPDs)are first demonstrated with the sandwich structure of ITO/PEDOT:PSS/PBDB-T:PZ1(100:x,wt/wt)/Al.The optimal PM type all-PPDs with PBDB-T:PZ1(100:3,wt/wt)as active layers exhibit external quantum efficiency(EQE)of>100%in the spectral range from 310 to 790 nm.Under 675 nm light illumination,the champion EQE value arrives to 1,470%at-20 V bias and the specific detectivity approaches 1×10^12 Jones at-10 V bias.The PM phenomenon in all-PPDs results from hole tunneling injection assisted by interfacial band bending induced by trapped electrons in PZ1 near Al electrode.The EQE values of optimal PM type all-PPDs still remained over 90%of the original value after 60 d of the storage in a high-purity nitrogen-filled glove box.
