PDA modified NIR-II NaEr0.8Yb0.2F4 nanoparticles with high photothermal effect

• Published in: Nanotechnology Vol. 33; no. 38
• Main Authors: Zhan, Weifan, Zhao, Bin, Cui, Xiaoxia, Liu, Junsong, Xiao, Xusheng, Xu, Yantao, She, Shengfei, Hou, Chaoqi, Guo, Haitao
• Format: Journal Article
• Language: English
• Published: England IOP Publishing 17.09.2022
• Subjects: fluorescence imaging; light and heat; near-infrared-secondary; rare earth nanoparticles; NIR-II; Rare earth nanoparticles; Fluorescence imaging; Photothermal
• ISSN: 0957-4484; 1361-6528
• DOI: 10.1088/1361-6528/ac72b3

Polydopamine (PDA) modified NaEr0.8Yb0.2F4 nanoparticles with strong NIR-II emission, high quantum yield (QY) of 29.63% and excellent photothermal performance were synthesized. The crystal phase and microstructure were characterized. The optical properties including absorption, NIR-II emission and photo stability were investigated and the luminescence mechanism were discussed in detail. The key factors of NIR-II imaging including penetration depth, spatial resolution and signal-to-noise ratio (SNR) were especially evaluated in the fresh pork tissues. High penetration depth of 5 mm with high spatial resolution of 1 mm were detected. The photothermal conversion effect of PDA modified NPs is twice as large as the reported materials. These NIR-II nanoparticles possess superior optical properties, high photothermal efficiency and low cytotoxicity，and would be potential fluorescence probes for further disease diagnosis and treatment.