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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。
Based on the shell-enhanced nanoparticle enhancement technology, a new type of plasmon Raman spectroscopy test system has been developed, which can effectively improve the Raman signal intensity of the measured substance. Shell-Sided Nanoparticle Enhancement Technology Using a single-layer gold nanoparticle encapsulating a very thin layer of silica or alumina can produce a stronger surface-enhanced effect. The hardware part of the test system mainly includes dual-processor (ARM and DSP) main control board, semiconductor laser light source, spectrometer, fiber optic probe and particle application device; software part can automatically obtain the Raman spectrum of the tested substance. Here, the particle application device is used to automatically apply the shell-separated nano-particles to the sample under test. In the experiment, the test system was used to detect melamine and malachite green, a banned additive for foodstuffs, to validate shell-enhanced nanoparticle-enhanced Raman spectroscopy. The experimental results show that the system has high testing sensitivity and short testing time, and is widely applicable to the rapid detection of trace substances in food safety.