https://scholars.lib.ntu.edu.tw/handle/123456789/641758
標題: | Preparation of Amphiphilic Ag-Polyethylenimine Dendritic Polymer Nanocapsules for Surface-Enhanced Raman Scattering Detection | 作者: | Xu, Qi Yang Lin, Gong De Wang, Kuan Syun Huang, Ying Chi Huang, Yu Xuan Lin, Chen Yang Wu, Chien Hsin RU-JONG JENG Liu, Ting Yu |
關鍵字: | dendritic polymer | polyethylenimine | silver nanoparticles | surface-enhanced Raman scattering detection | 公開日期: | 22-三月-2024 | 卷: | 6 | 期: | 6 | 來源出版物: | ACS Applied Polymer Materials | 摘要: | According to recent research, amphiphilic surfactants can stabilize metal nanoparticles because of their excellent dispersibility. Therefore, herein, amphiphilic polyethylenimine (PEI) dendritic polymer nanocapsules were synthesized by using PEI and poly(urea/malonamide) dendrons of different generations. Then, silver nanoparticles (AgNPs) were immobilized on PEI dendritic polymer nanocapsules for surface-enhanced Raman scattering (SERS) detection. Well-designed amphiphilic PEI dendrons possessed abundant nucleation sites for AgNP reduction, which could directly reduce silver ions to AgNPs without additional reducing agents at room temperature, showing the stronger reducing capability than pristine PEI. The size and interparticle gap of AgNPs were manipulated by varying the size of the PEI dendritic polymer and the ratio of PEI dendritic nanocapsules/AgNO3. As a result, the Ag-PEI-dendritic polymer was able to perform Raman enhancing capability. Especially, a sample, namely, Ag-PEI-G0.5, exhibited the strongest Raman enhancement effect, due to the optimal size and interparticle gap of AgNPs. The Ag-PEI dendritic SERS nanocapsules could rapidly and reproducibly detect many kinds of biomolecules (adenine, methylene blue, and beta-carotene) with a linear calibration curve. The limit of detection (LOD) of adenine was lower than 10-7 M. Therefore, this facile method to in situ prepare Ag-PEI dendritic SERS nanocapsules (reducing agent free) possesses high potential to be applied in rapid SERS detection for the quantitative analysis of biomolecules. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/641758 | ISSN: | 2637-6105 2637-6105 |
DOI: | 10.1021/acsapm.3c02978 |
顯示於: | 高分子科學與工程學研究所 |
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