Au Nanorod Decoration on NaYF4:Yb/Tm Nanoparticles for Enhanced Emission and Wavelength-Dependent Biomolecular Sensing
Au Nanorod Decoration on NaYF4:Yb/Tm Nanoparticles for Enhanced Emission and Wavelength-Dependent Biomolecular Sensing
复制标题
DOI：
10.1021/am4007758
复制
发表时间：
2013-05-08
影响因子：
9.5
通讯作者：
Kim, Dong-Hwan
中科院分区：
文献类型：
--
作者：
Kannan, Palanisamy;Rahim, Ferhan Abdul;Kim, Dong-Hwan
我们在NaYF4：Yb/TM上转换纳米晶(UCNCs)表面引入了金纳米棒(GNRs)修饰，方法是用第一代聚酰胺胺(PamAm G1)树枝状大分子对UCNCs进行功能化处理，然后通过种子一步法生长长程GNRs，以增强“生物窗口”上转换发光。GNR修饰的UCNCs的上转换发射可以增强到通常使用壳状结构所能获得的水平，最高可提高27倍。此外，通过改变GNR的纵横比，可以在不同的波长区域调谐增强。GNR修饰的Ucnc进一步用2-硫氧嘧啶修饰，用于尿酸的非酶检测，检测下限为1 pm。
We introduce gold nanorods (GNRs) decoration on NaYF4:Yb/Tm upconversion nanocrystals (UCNCs) by functionalizing the UCNCs with polyamidoamine generation 1 (PAMAM G1) dendrimer, followed by a single-step seed-mediated growth of long-range GNRs to enhance "biological window" upconversion emission. The up-conversion emission of GNR-decorated UCNCs can be enhanced beyond the level typically obtainable using shell-like structures up to 27-fold enhancement. Also, the enhancement can be tuned at different wavelength regions by varying the GNR aspect ratio. The GNR-decorated UCNC is further modified with 2-thiouracil for nonenzymatic detection of uric acid, revealing a detection limit as 1 pM.