Au Nanorod Decoration on NaYF4:Yb/Tm Nanoparticles for Enhanced Emission and Wavelength-Dependent Biomolecular Sensing
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- 作者：Palanisamy Kannan ; Ferhan Abdul Rahim ; Rui Chen ; Xue Teng ; Ling Huang ; Handong Sun ; Dong-Hwan Kim
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2013
- 出版时间：May 8, 2013
- 年：2013
- 卷：5
- 期：9
- 页码：3508-3513
- 全文大小：301K
- 年卷期：v.5,no.9(May 8, 2013)
- ISSN：1944-8252
文摘
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 鈥渂iological window鈥?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.