Open AccessUCNPs@Zn0.5Cd0.5S Core-Shell and Yolk-Shell Nanostructures: Selective Synthesis, Characterization, and Near-Infrared-Mediated Photocatalytic Reduction of Cr(VI)
Author(s) -
Wanni Wang,
Dong Wang,
Chenxi Huang,
Bo Liu,
Sheng Cheng,
Haisheng Qian
Publication year - 2018
Publication title -
journal of nanomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.463
H-Index - 66
eISSN - 1687-4129
pISSN - 1687-4110
DOI - 10.1155/2018/1293847
Subject(s) - materials science , photocatalysis , nanostructure , calcination , nanoparticle , semiconductor , chemical engineering , nanotechnology , infrared , sulfidation , sulfur , catalysis , optoelectronics , metallurgy , chemistry , physics , optics , engineering , biochemistry
Constructing near-infrared-light-mediated core-shell nanostructures incorporating upconversion nanoparticles (UCNPs) and semiconductors is of great importance for potential applications in photocatalysis, nano-biomedical engineering, solar cell, etc. In this work, we have demonstrated a two-step solution process to synthesize UCNPs@Zn 0.5 Cd 0.5 S core-shell nanoparticles (CSN). Firstly, a layer of AA-Zn(Cd)[OH] 4− composites was coated on UCNPs to form UCNPs@AA-Zn(Cd)[OH] 4− composites, which has been converted to UCNPs@Zn 0.5 Cd 0.5 S CSN via sulfidation reaction process using thioacetamide (TAA) as the sulfur source. Moreover, the UCNPs@Zn 0.5 Cd 0.5 S yolk-shell nanoparticles (YSN) have been obtained from the UCNPs@Zn 0.5 Cd 0.5 S CSN after calcination at 400°C, which show significantly photocatalytic activity for reduction of Cr(VI) under near-infrared light. All these can be attributed to the enhanced crystallization degree, resulting in enhanced energy transfer efficiency and separation efficiency of the photogenerated electrons and holes. An alternative strategy is provided in this study for fabrication of UCNP/semiconductor composites for various applications.