To investigate the role of oxygen defects on the photocatalytic activity of TiO2,the TiO2 nanocrystals with/without oxygen defects are successfully synthesized by the hydrothermal and sol‐gel methods,respectively.The...To investigate the role of oxygen defects on the photocatalytic activity of TiO2,the TiO2 nanocrystals with/without oxygen defects are successfully synthesized by the hydrothermal and sol‐gel methods,respectively.The as‐prepared TiO2 nanocrystals with defects are light blue and the absorption edge of light is towards the visible light region(~420 nm).Raman and X‐ray photoelectron spectroscopy(XPS)measurements all confirm that the concentration of oxygen vacancies in the TiO2 synthesized by the sol‐gel method is less than that synthesized through the hydrothermal route.The introduction of oxygen defects contributes to a new state in the band gap that narrows the band gap,which is the reason for the extension of light absorption into the visible light region.The photocurrent results confirm that this band‐gap narrowing enhances the photocurrent response under simulated solar light irradiation.The TiO2 with oxygen defects shows a higher photocatalytic activity for decomposition of a methylene blue solution compared with that of the perfect TiO2 sample.The photocatalytic mechanism is discussed based on the density functional theory calculations and photoluminescence spectroscopy measurements.展开更多
Single-or few-layer black phosphorus(FLBP)has attracted great attentions in scientic community with its excellent properties,including biodegradability,unique puckered lattice conguration,attractive electrical propert...Single-or few-layer black phosphorus(FLBP)has attracted great attentions in scientic community with its excellent properties,including biodegradability,unique puckered lattice conguration,attractive electrical properties and direct and tunable band gap.In recent years,FLBP has been widely studied in bio-photonicelds such as photothermal and photodynamic therapy,drug delivery,bioimaging and biosensor,showing attractive clinical potential.Because of the marked advantages of FLBP nanomaterials in bio-photonicelds,this review article reviews the latest advances of biomaterials based on FLBP in biomedical applications,ranging from biocompatibility,medical diagnosis to treatment.展开更多
基金supported by the National Natural Science Foundation of China(51602207)the Doctoral Scientific Research Foundation of Shenyang Medical College(20174043)+1 种基金the Scientific Research Project for University Students of Shenyang Medical College(20160809)the Doctoral Scientific Research Foundation of Liaoning Province(201601149,20170520011)~~
文摘To investigate the role of oxygen defects on the photocatalytic activity of TiO2,the TiO2 nanocrystals with/without oxygen defects are successfully synthesized by the hydrothermal and sol‐gel methods,respectively.The as‐prepared TiO2 nanocrystals with defects are light blue and the absorption edge of light is towards the visible light region(~420 nm).Raman and X‐ray photoelectron spectroscopy(XPS)measurements all confirm that the concentration of oxygen vacancies in the TiO2 synthesized by the sol‐gel method is less than that synthesized through the hydrothermal route.The introduction of oxygen defects contributes to a new state in the band gap that narrows the band gap,which is the reason for the extension of light absorption into the visible light region.The photocurrent results confirm that this band‐gap narrowing enhances the photocurrent response under simulated solar light irradiation.The TiO2 with oxygen defects shows a higher photocatalytic activity for decomposition of a methylene blue solution compared with that of the perfect TiO2 sample.The photocatalytic mechanism is discussed based on the density functional theory calculations and photoluminescence spectroscopy measurements.
基金the National Natural Science Foundation of China(61435010 and 61575089,H.Z.)the Science and Technology Innovation Commission of Shenzhen(KQTD-2015032416270385 and JCYJ20150625103619275,H.Z.)+2 种基金the China Postdoctoral Science Foundation(2017M610540,2018T110892,M.Q.)the Natural Science Foundation of Shandong Province,China(ZR2016BB33,M.Q.)the Natural Science Foundation of Guangdong Province,China(2018A030310500,M.Q.).
文摘Single-or few-layer black phosphorus(FLBP)has attracted great attentions in scientic community with its excellent properties,including biodegradability,unique puckered lattice conguration,attractive electrical properties and direct and tunable band gap.In recent years,FLBP has been widely studied in bio-photonicelds such as photothermal and photodynamic therapy,drug delivery,bioimaging and biosensor,showing attractive clinical potential.Because of the marked advantages of FLBP nanomaterials in bio-photonicelds,this review article reviews the latest advances of biomaterials based on FLBP in biomedical applications,ranging from biocompatibility,medical diagnosis to treatment.
