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Issue 20, 2019
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Self-assembled CeVO4/Ag nanohybrid as photoconversion agents with enhanced solar-driven photocatalysis and NIR-responsive photothermal/photodynamic synergistic therapy performance

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Abstract

The plasmonic cerium vanadate (CeVO4) semiconductor and plasmonic silver (Ag) metal exhibit a localized surface plasmon resonance (LSPR) effect in the visible (Vis)-light region; however, weak absorption in the near-infrared (NIR) region restricts their environmental remediation and biomedical application. Herein, CeVO4/Ag nanohybrids with self-assembled heterostructure and improved Vis/NIR light absorption were synthesized from CeVO4 nanosheets and AgNO3 solution, which could serve as potential solar-driven catalytic agents and near-infrared (NIR) light responsive anticancer agents. Oleic acid-stabilized CeVO4 nanosheets were modified with the HS-PEG1000-OH by the thiol–ene click reaction and presented self-assembly morphology in aqueous solution due to hydrophobic–hydrophobic interactions. Sulfhydryl (–SH) groups provided stable sites for Ag+ ions on the surface of CeVO4, and Ag+ ions could be directly reduced by Ce3+ ions to form CeVO4/Ag heterojunction nanocrystals (NCs). Due to the higher absorption in the Vis/NIR light region than CeVO4 nanosheets, CeVO4/Ag NCs led to the improved solar light responsive photocatalytic degradation of organic dyes. Upon the exposure of these NCs to an 808 nm laser, CeVO4/Ag NCs show high photothermal conversion efficiency, ROS generation ability and photoacoustic (PA) signal for implementing PA imaging-guided photothermal/photodynamic synergistic cancer therapy with better tumor inhibition effect.

Graphical abstract: Self-assembled CeVO4/Ag nanohybrid as photoconversion agents with enhanced solar-driven photocatalysis and NIR-responsive photothermal/photodynamic synergistic therapy performance

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Supplementary files

Article information


Submitted
20 Mar 2019
Accepted
28 Apr 2019
First published
01 May 2019

Nanoscale, 2019,11, 10129-10136
Article type
Paper

Self-assembled CeVO4/Ag nanohybrid as photoconversion agents with enhanced solar-driven photocatalysis and NIR-responsive photothermal/photodynamic synergistic therapy performance

M. Chang, M. Wang, Y. Chen, M. Shu, Y. Zhao, B. Ding, Z. Hou and J. Lin, Nanoscale, 2019, 11, 10129
DOI: 10.1039/C9NR02412C

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