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首页> 外文期刊>Micro and Nano Systems Letters >Polyethyleneglycol diacrylate hydrogels with plasmonic gold nanospheres incorporated via functional group optimization
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Polyethyleneglycol diacrylate hydrogels with plasmonic gold nanospheres incorporated via functional group optimization

机译：聚乙二醇二丙烯酸酯水凝胶，具有通过官能团优化引入的等离激元金纳米球

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摘要

We present a facile method for the preparation of polyethyleneglycol diacrylate (PEG-DA) hydrogels with plasmonic gold (Au) nanospheres incorporated for various biological and chemical sensing applications. Plasmonic Au nanospheres were prepared ex situ using the standard citrate reduction method with an average diameter of 3.5?nm and a standard deviation of 0.5?nm, and evaluated for their surface functionalization process intended for uniform dispersion in polymer matrices. UV–Visible spectroscopy reveals the existence of plasmonic properties for pristine Au nanospheres, functionalized Au nanospheres, and PEG-DA with uniformly dispersed functionalized Au nanospheres (hybrid Au/PEG-DA hydrogels). Hybrid Au/PEG-DA hydrogels examined by using Fourier transform infra-red spectroscopy (FT-IR) exhibit the characteristic bands at 1635, 1732 and 2882?cm?1 corresponding to reaction products of OH? originating from oxidized product of citrate, –C=O stretching from ester bond, and C–H stretching of PEG-DA, respectively. Thermal studies of hybrid Au/PEG-DA hydrogels show three-stage decomposition with their stabilities up to 500?°C. Optical properties and thermal stabilities associated with the uniform dispersion of Au nanospheres within hydrogels reported herein will facilitate various biological and chemical sensing applications.
机译：我们提供了一种简便的方法来制备聚乙二醇二丙烯酸酯（PEG-DA）水凝胶，并结合了等离子体金（Au）纳米球用于各种生物和化学传感应用。使用标准柠檬酸盐还原法异位制备等离子金纳米球，平均直径为3.5？nm，标准偏差为0.5？nm，并对其表面官能化过程进行评估，以使其均匀地分散在聚合物基质中。紫外可见光谱揭示了原始Au纳米球，功能化Au纳米球和具有均匀分散的功能化Au纳米球（混合Au / PEG-DA水凝胶）的PEG-DA的等离激元性质。用傅里叶变换红外光谱法（FT-IR）检测的金/ PEG-DA杂化水凝胶在1635、1732和2882Ωcm？1处显示出与OH？的反应产物相对应的特征谱带。源自柠檬酸盐的氧化产物，–C = O从酯键延伸，以及PEG-DA的C–H延伸。混合Au / PEG-DA水凝胶的热学研究表明，三阶段分解的稳定性高达500？C。本文报道的与金纳米球在水凝胶中均匀分散有关的光学性质和热稳定性将促进各种生物和化学传感应用。

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