Metal oxide semiconductors(MOS)-reduced graphene oxide(rGO)nanocomposites have attracted great attention for room-tempe rature gas sensing applications.The development of novel sensing materials is the key issue for t...Metal oxide semiconductors(MOS)-reduced graphene oxide(rGO)nanocomposites have attracted great attention for room-tempe rature gas sensing applications.The development of novel sensing materials is the key issue for the effective detection of ammoniagas at room temperature.In the present work,the novel reduced graphene oxide(rGO)-In2 O3 nanocubes hybrid materials have been prepared via a simple electrostatic self-assembly strategy.Characterization re sults exhibit that the intimate interfacial contact between In2 O3 nanocubes and the rGO sheets are achieved.Particularly,the as-prepared rGO/In2 O3 nanocomposites displayed high sensitivity,fast response and excellent selectivity towards ammonia(NH3)at room-temperature,which clearly uncovers the merit of structural design and rational integration with rGO sheets.The superior gas sensing performance of the rGO/In2 O3 nanocomposites can be attributed to the synergetic effects of rGO sheets and porous In2 O3 nanocubes.The reported synthesis offers a general approach to rGO/MOS-based semiconductor composites for room-temperature gas sensing applications.展开更多
The heterostructures of In2O3 nanoparticle loaded on anatase TiO2 nanocube with exposed （001） facet （In2O3/TiO2-nanocube） were fabricated via a two-step hydrothermal process. The crystal phase, morphology, mi- cro...The heterostructures of In2O3 nanoparticle loaded on anatase TiO2 nanocube with exposed （001） facet （In2O3/TiO2-nanocube） were fabricated via a two-step hydrothermal process. The crystal phase, morphology, mi- cro-stnmture and photo-absorption property of the products were characterized by FESEM, TEM, XRD, and UV-Vis diffuse reflectance spectroscopy. The results showed that the percentage of exposed （001） facet of TiO2 nanocube was about 33%. In2O3 nanoparticles were successfully decorated on the surface of TiO2 nanocube to form the In2O3/TiO2 heterojtmction. Photocurrent measurements confirmed that （001） faceted surface was advantageous for the charge carrier migration and separation in the composites. In comparison with bare TiO2 nanocube and In2O3/TiO2-nanoparticle, the In2O3/TiO2-nanocube heterostructures exhibited enhanced activity toward the degradation of rhodamine B and tetracycline under visible light irradiation, which was attributed to the synergic effect of In2O3/TiO2 heterojunction and the exposure of （001） facet.展开更多
基金supported by the National Natural Science Foundation of China(No.61102006)Natural Science Foundation of Shandong Province,China(Nos.ZR2015EM019 and ZR2014EL006)。
文摘Metal oxide semiconductors(MOS)-reduced graphene oxide(rGO)nanocomposites have attracted great attention for room-tempe rature gas sensing applications.The development of novel sensing materials is the key issue for the effective detection of ammoniagas at room temperature.In the present work,the novel reduced graphene oxide(rGO)-In2 O3 nanocubes hybrid materials have been prepared via a simple electrostatic self-assembly strategy.Characterization re sults exhibit that the intimate interfacial contact between In2 O3 nanocubes and the rGO sheets are achieved.Particularly,the as-prepared rGO/In2 O3 nanocomposites displayed high sensitivity,fast response and excellent selectivity towards ammonia(NH3)at room-temperature,which clearly uncovers the merit of structural design and rational integration with rGO sheets.The superior gas sensing performance of the rGO/In2 O3 nanocomposites can be attributed to the synergetic effects of rGO sheets and porous In2 O3 nanocubes.The reported synthesis offers a general approach to rGO/MOS-based semiconductor composites for room-temperature gas sensing applications.
基金Supported. by the National Natural Science Foundation of China（No.21103054）, the Natural Science Foundation of Fujian Province of China（Nos.2017J01014, 2012J05024） and the Promotion Program for Young and Middle-aged Teachers in Science and Technology Research of Huaqiao University, China（No.ZQN-PY206）.
文摘The heterostructures of In2O3 nanoparticle loaded on anatase TiO2 nanocube with exposed （001） facet （In2O3/TiO2-nanocube） were fabricated via a two-step hydrothermal process. The crystal phase, morphology, mi- cro-stnmture and photo-absorption property of the products were characterized by FESEM, TEM, XRD, and UV-Vis diffuse reflectance spectroscopy. The results showed that the percentage of exposed （001） facet of TiO2 nanocube was about 33%. In2O3 nanoparticles were successfully decorated on the surface of TiO2 nanocube to form the In2O3/TiO2 heterojtmction. Photocurrent measurements confirmed that （001） faceted surface was advantageous for the charge carrier migration and separation in the composites. In comparison with bare TiO2 nanocube and In2O3/TiO2-nanoparticle, the In2O3/TiO2-nanocube heterostructures exhibited enhanced activity toward the degradation of rhodamine B and tetracycline under visible light irradiation, which was attributed to the synergic effect of In2O3/TiO2 heterojunction and the exposure of （001） facet.
