title: Sequential coating upconversion NaYF4:Yb,Tm nanocrystals with SiO2and ZnO layers for NIR-driven photocatalytic and antibacterial applications.
abstract: ZnO is one of the most promising materials for both photocatalytic and antibacterial applications, but its wide bandgap requires the excitation of UV light which limits their applications under visible and NIR bands. Herein, we demonstrate a facile approach to synthesize core-shell-shell hybrid nanoparticles consisting of hexagonal NaYF4:Yb,Tm, amorphous SiO2and wurtzite ZnO. The upconversion nanocrystals are used as the core seeds and sequentially coated with an insulting shell and a semiconductor layer. Such hybrid nanoparticles can efficiently utilize the NIR light through the upconverting process, and display notable photocatalytic performance and antibacterial activity under NIR irradiation. The developed NaYF4:Yb,Tm@SiO2@ZnO nanoparticles are characterized with TEM, XRD, EDS, XPS and PL spectra, and their working mechanism is also elucidated.
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China.
authors: Meijie
authors: M
authors: Tou
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China.
authors: Zhenguo
authors: Z
authors: Luo
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China.
authors: Song
authors: S
authors: Bai
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China.
authors: Fangying
authors: F
authors: Liu
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China.
authors: Qunxia
authors: Q
authors: Chai
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China.
authors: Sheng
authors: S
authors: Li
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China. Electronic address: zqli@zjnu.edu.cn.
authors: Zhengquan
authors: Z
authors: Li
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D002384:Catalysis / Q000187:drug effects; D020099:Coated Materials, Biocompatible / Q000737:chemistry* / Q000494:pharmacology; D005459:Fluorides / Q000737:chemistry* / Q000494:pharmacology; D008163:Luminescent Measurements; D008826:Microbial Sensitivity Tests; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D017382:Reactive Oxygen Species / Q000032:analysis; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared; D013932:Thulium / Q000737:chemistry; D014961:X-Ray Diffraction; D015019:Yttrium / Q000737:chemistry* / Q000494:pharmacology; D015034:Zinc Oxide / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D020099:Coated Materials, Biocompatible; D017382:Reactive Oxygen Species; C525362:sodium yttriumtetrafluoride; D015019:Yttrium; D012822:Silicon Dioxide; D013932:Thulium; D005459:Fluorides; D015034:Zinc Oxide
keywords: Antibacterial; Core-shell structure; Photocatalysis; Upconversion; ZnO