Abstract Ultra-thin two-dimensional (2D) nanosheets of Zn-based metal -organic framework (MOF) were prepared from the precursor [Zn(bpydc) (H2O)·H2O]n (bpydc = 2,2′-bipyridine-5,5′-dicarboxylate), by using a liquid phase ultrasonic stripping technique. The atomic thickness and the abundant oxygen atoms making the nanosheets are well dispersed in various solvents, exhibiting unique fluorescence responses to solvents of different polarities. Adding on, by loading on the ytterbium ion (Yb3+)-sensitized hexagonal phase up-converting nanoparticles (UCNPs, sodium yttrium fluoride (NaYF4): 20 mol% Yb3+, 1 mol% erbium (Er3+ ions)) on the surfaces of nanosheets, the in-situ near infrared (NIR) light (980 nm) triggered luminescence enhancement has been observed, suggesting the favorable application foreground in biomedical science, super-capacitors, and electronic devices.

中文翻译：

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用于原位 NIR 光触发荧光增强的超薄二维纳米片

摘要 以 [Zn(bpydc) (H2O)·H2O]n (bpydc = 2,2'-bipyridine-5) 为前驱体制备了超薄二维 (2D) Zn 基金属有机骨架 (MOF) 纳米片,5'-二羧酸盐），通过使用液相超声剥离技术。纳米片的原子厚度和丰富的氧原子很好地分散在各种溶剂中，对不同极性的溶剂表现出独特的荧光响应。此外，通过在纳米片表面加载镱离子 (Yb3+) 敏化的六方相上转换纳米粒子（UCNP、氟化钇钠（NaYF4）：20 mol% Yb3+、1 mol% 铒（Er3+ 离子）），已观察到原位近红外（NIR）光（980 nm）触发的发光增强，表明在生物医学科学、超级电容器、