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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >A simple and highly efficient route to the synthesis of NaLnF _4-Ag hybrid nanorice with excellent SERS performances
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A simple and highly efficient route to the synthesis of NaLnF _4-Ag hybrid nanorice with excellent SERS performances

机译：具有优异SERS性能的合成NaLnF _4-Ag杂化纳米粒子的简单高效途径

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摘要

This paper reports the synthesis of a new class of NaLnF _4-Ag (Ln = Nd, Sm, Eu, Tb, Ho) hybrid nanorice and its application as a surface-enhanced Raman scattering (SERS) substrate in chemical analyses. Rice-shaped NaLnF _4 nanoparticles as templates are prepared by a modified hydrothermal method. Then, the NaLnF _4 nanorice particles are decorated with Ag nanoparticles by magnetron sputtering method to form NaLnF _4-Ag hybrid nanostructures. The high-density Ag nanogaps on NaLnF _4 can be obtained by the prolonging sputtering times or increasing the sputtering powers. These nanogaps can serve as Raman 'hot spots', leading to dramatic enhancement of the Raman signal. The NaLnF _4-Ag hybrid nanorice is found to be robust and is an efficient SERS substrate for the vibrational spectroscopic characterization of molecular adsorbates; the Raman enhancement factor of Rhodamine 6G (R6G) absorbed on NaLnF _4-Ag nanorice is estimated to be about 10 ~(13). Since the produced NaLnF _4-Ag hybrid nanorice particles are firmly fastened on a silicon wafer, they can serve as universal SERS substrates to detect target analytes. We also evaluate their SERS performances using 4-mercaptopyridine (Mpy), and 4-mercaptobenzoic acid (MBA) molecules, and the detection limit for Mpy and MBA is as low as 10 ~(-12) M and 10 ~(-10) M, respectively, which meets the requirements of the ultratrace detection of analytes. This simple and highly efficient approach to the large-scale synthesis of NaLnF _4-Ag nanorice with high SERS activity and sensitivity makes it a perfect choice for practical SERS detection applications.
机译：本文报道了新型NaLnF _4-Ag（Ln = Nd，Sm，Eu，Tb，Ho）杂化纳米粒子的合成及其在化学分析中作为表面增强拉曼散射（SERS）底物的应用。采用改进的水热法制备了稻米状NaLnF_4纳米颗粒作为模板。然后，通过磁控溅射方法用Ag纳米粒子修饰NaLnF _4纳米粒子，形成NaLnF _4-Ag杂化纳米结构。可以通过延长溅射时间或增加溅射功率来获得NaLnF _4上的高密度Ag纳米间隙。这些纳米间隙可以用作拉曼的“热点”，从而极大地增强了拉曼信号。已发现NaLnF _4-Ag杂化纳米颗粒很结实，是分子吸附物振动光谱表征的有效SERS底物。据估计，罗丹明6G（R6G）在NaLnF _4-Ag纳米米上的拉曼增强因子约为10〜（13）。由于产生的NaLnF _4-Ag杂化纳米颗粒牢固地固定在硅晶片上，因此它们可以用作通用SERS衬底来检测目标分析物。我们还使用4-巯基吡啶（Mpy）和4-巯基苯甲酸（MBA）分子评估了它们的SERS性能，并且Mpy和MBA的检出限低至10〜（-12）M和10〜（-10） M，分别满足分析物超痕量检测的要求。这种简单高效的大规模合成具有高SERS活性和灵敏度的NaLnF _4-Ag纳米粉的方法，使其成为实际SERS检测应用的理想选择。

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