Synthesis of lanthanide-doped NaYF₄@TiO₂ core-shell composites with highly crystalline and tunable TiO₂ shells under mild conditions and their upconversion-based photocatalysis.

NaYF4:Yb,Tm@TiO₂ core-shell composites were synthesized via a facile hydrothermal method. The highly crystalline TiO₂ shell can be uniformly coated onto lanthanide-doped NaYF₄ microrods and nanorods under mild conditions without calcination. The thickness of the TiO₂ shell can be tuned by varying the ratio of fluoride rods and Ti precursors. The microcomposite with a moderate TiO₂ shell shows excellent photocatalytic activity under near-infrared irradiation.

[1]  Z. Lou,et al.  Near-infrared photocatalyst of Er3+/Yb3+ codoped (CaF2@TiO2) nanoparticles with active-core/active-shell structure , 2013 .

[2]  Botao Wu,et al.  Ultrasensitive polarized up-conversion of Tm(3+)-Yb3+ doped β-NaYF4 single nanorod. , 2013, Nano letters.

[3]  Wei Liu,et al.  Highly Uniform, Bifunctional Core/Double‐Shell‐Structured β‐NaYF4:Er3+, Yb3+ @ SiO2@TiO2 Hexagonal Sub‐microprisms for High‐Performance Dye Sensitized Solar Cells , 2013, Advanced materials.

[4]  Tze Chien Sum,et al.  Photon Upconversion in Hetero‐nanostructured Photoanodes for Enhanced Near‐Infrared Light Harvesting , 2013, Advanced materials.

[5]  Wei Guo,et al.  An upconversion NaYF4:Yb3+,Er3+/TiO2 core–shell nanoparticle photoelectrode for improved efficiencies of dye-sensitized solar cells , 2013 .

[6]  G. Du,et al.  Synthesis of rhombic hierarchical YF₃ nanocrystals and their use as upconversion photocatalysts after TiO₂ coating. , 2013, Nanoscale.

[7]  R. Yang,et al.  NIR-Responsive Photocatalytic Activity and Mechanism of NaYF4:Yb,Tm@TiO2 Core–Shell Nanoparticles , 2013 .

[8]  Wei Huang,et al.  Enhancing solar cell efficiency: the search for luminescent materials as spectral converters. , 2013, Chemical Society reviews.

[9]  Xiaoyong Huang,et al.  Finding a single lanthanide ion through upconversion. , 2012, Chemphyschem : a European journal of chemical physics and physical chemistry.

[10]  Ru‐Shi Liu,et al.  The effect of surface coating on energy migration-mediated upconversion. , 2012, Journal of the American Chemical Society.

[11]  Xiaogang Liu,et al.  Photonics: Upconversion goes broadband. , 2012, Nature materials.

[12]  R. Frost,et al.  Decoration of titania nanofibres with anatase nanoparticles as efficient photocatalysts for decomposing pesticides and phenols. , 2012, Journal of colloid and interface science.

[13]  Wei Li,et al.  A versatile kinetics-controlled coating method to construct uniform porous TiO2 shells for multifunctional core-shell structures. , 2012, Journal of the American Chemical Society.

[14]  Yang Liu,et al.  Anti‐cAngptl4 Ab‐Conjugated N‐TiO2/NaYF4:Yb,Tm Nanocomposite for Near Infrared‐Triggered Drug Release and Enhanced Targeted Cancer Cell Ablation , 2012, Advanced healthcare materials.

[15]  Nan Zhang,et al.  Improving the photocatalytic performance of graphene-TiO2 nanocomposites via a combined strategy of decreasing defects of graphene and increasing interfacial contact. , 2012, Physical chemistry chemical physics : PCCP.

[16]  Jun Li,et al.  Upconversion-P25-graphene composite as an advanced sunlight driven photocatalytic hybrid material , 2012 .

[17]  Z. Tang,et al.  Facile synthesis of Au@TiO2 core–shell hollow spheres for dye-sensitized solar cells with remarkably improved efficiency , 2012 .

[18]  Renren Deng,et al.  Tuning upconversion through energy migration in core-shell nanoparticles. , 2011, Nature materials.

[19]  Dan Zhao,et al.  Synthesis and upconversion luminescence of NaYF4:Yb, Tm/TiO2 core/shell nanoparticles with controllable shell thickness. , 2011, Journal of nanoscience and nanotechnology.

[20]  Xianzhi Fu,et al.  Synthesis of M@TiO2 (M = Au, Pd, Pt) Core–Shell Nanocomposites with Tunable Photoreactivity , 2011 .

[21]  Qing Peng,et al.  Lanthanide-doped nanocrystals: synthesis, optical-magnetic properties, and applications. , 2011, Accounts of chemical research.

[22]  K. Miura,et al.  Simultaneous tailoring of phase evolution and dopant distribution in the glassy phase for controllable luminescence. , 2010, Journal of the American Chemical Society.

[23]  Jian Zhu,et al.  NaYF4:Yb,Tm/CdS composite as a novel near-infrared-driven photocatalyst , 2010 .

[24]  G. Demopoulos,et al.  Near‐Infrared Sunlight Harvesting in Dye‐Sensitized Solar Cells Via the Insertion of an Upconverter‐TiO2 Nanocomposite Layer , 2010, Advanced materials.

[25]  Xueyuan Chen,et al.  Upconversion nanoparticles in biological labeling, imaging, and therapy. , 2010, The Analyst.

[26]  C. M. Li,et al.  Constructing hierarchical spheres from large ultrathin anatase TiO2 nanosheets with nearly 100% exposed (001) facets for fast reversible lithium storage. , 2010, Journal of the American Chemical Society.

[27]  Dan Zhao,et al.  Near-infrared photocatalysis based on YF3 : Yb3+,Tm3+/TiO2 core/shell nanoparticles. , 2010, Chemical communications.

[28]  C. S. Lim,et al.  Simultaneous phase and size control of upconversion nanocrystals through lanthanide doping , 2010, Nature.

[29]  Eric R. Waclawik,et al.  An efficient photocatalyst structure: TiO(2)(B) nanofibers with a shell of anatase nanocrystals. , 2009, Journal of the American Chemical Society.

[30]  A. Manivannan,et al.  Origin of photocatalytic activity of nitrogen-doped TiO2 nanobelts. , 2009, Journal of the American Chemical Society.

[31]  Xiaogang Liu,et al.  Recent advances in the chemistry of lanthanide-doped upconversion nanocrystals. , 2009, Chemical Society reviews.

[32]  A. Fujishima,et al.  TiO2 photocatalysis and related surface phenomena , 2008 .

[33]  W. Li,et al.  Enhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber , 2008 .

[34]  Fuqiang Huang,et al.  Synergistic effect of two surface complexes in enhancing visible-light photocatalytic activity of titanium dioxide , 2008 .

[35]  Liang Sun,et al.  Silica-/titania-coated Y2O3:Tm3+, Yb3+ nanoparticles with improvement in upconversion luminescence induced by different thickness shells , 2008 .

[36]  L. Archer,et al.  A General Route to Nonspherical Anatase TiO2 Hollow Colloids and Magnetic Multifunctional Particles , 2008 .

[37]  Ming Li,et al.  One-step solvothermal preparation of TiO2/C composites and their visible-light photocatalytic activities , 2008 .

[38]  Xiaobo Chen,et al.  Titanium dioxide nanomaterials: synthesis, properties, modifications, and applications. , 2007, Chemical reviews.

[39]  Xianping Fan,et al.  Spectroscopic properties of Er3+ doped glass ceramics containing Sr2GdF7 nanocrystals , 2006 .

[40]  Hua Chun Zeng,et al.  Preparation of Hollow Anatase TiO2 Nanospheres via Ostwald Ripening. , 2004, The journal of physical chemistry. B.

[41]  R. Asahi,et al.  Visible-Light Photocatalysis in Nitrogen-Doped Titanium Oxides , 2001, Science.

[42]  J. S. Lees,et al.  A structural investigation of titanium dioxide photocatalysts , 1991 .

[43]  A. Fujishima,et al.  Electrochemical Photolysis of Water at a Semiconductor Electrode , 1972, Nature.

[44]  A. Reller,et al.  Photoinduced reactivity of titanium dioxide , 2004 .