壳层隔绝纳米粒子增强拉曼光谱测试系统设计

Design of Raman spectroscopy measurement system based on SHINERS

  • 摘要: 基于壳层隔绝纳米粒子增强技术,开发了一种新型的等离激元拉曼光谱测试系统,该系统能够有效地提高被测物质的拉曼反射信号强度。壳层隔绝纳米粒子增强技术采用包裹了极薄的二氧化硅或者氧化铝壳层的单层金纳米粒子,能够产生较强的表面增强效应。整个测试系统的硬件部分主要包括双处理器(ARM和DSP)主控板、半导体激光光源、光谱仪、光纤探头和粒子施加装置;软件部分能够自动获取被测物质的拉曼谱图。这里,粒子施加装置用于自动地将壳层隔绝纳米粒子施加到被测样本中。在实验中,将测试系统用于检测食品违禁添加物三聚氰胺和孔雀石绿,以验证壳层隔绝纳米粒子增强拉曼光谱技术。实验结果表明,该测试系统具有较高的测试灵敏度和较短的测试时间,广泛地适用于食品安全中痕量物质快速检测。

     

    Abstract: In this paper, the Raman spectroscopy measurement system was presented, where Shell-isolated Nanoparticle Enhanced Raman Spectroscopy(SHINERS) technique was used to amplify the Raman signal. This technique used gold nanoparticles coated with a thin, uniform, fully enclosed and optically transparent shell of silica or alumina so that the gold core generated a large surface enhancement. Based on this technique, the hardware framework of this measurement system was mainly composed of double central control chips(ARM and DSP), a laser diode source, a spectrometer, a fiber probe and a nanoparticle giving device; and the software of this system can achieve the Raman spectrogram automatically. The giving device was used to spread the SHINERS particle into the samples for improving automation. The experiments were performed to detect the food added melamine and malachite green for verifying the effectiveness of SHINERS. The results show that the measurement system is of high detection sensitivity and short testing time effectively, which can be widely adopted in the rapid detection of trace substances in food safety.

     

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