Silver nanoparticles decorated nanoporous gold for surface-enhanced Raman scattering
Silver nanoparticles decorated nanoporous gold for surface-enhanced Raman scattering
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DOI：
10.1088/1361-6528/28/5/055301
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发表时间：
2017-02
期刊：
影响因子：
3.5
通讯作者：
Min Yang;Ling Zhang;Bin Chen;Zheng Wang;Chao Chen;H. Zeng
中科院分区：
文献类型：
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作者：
Min Yang;Ling Zhang;Bin Chen;Zheng Wang;Chao Chen;H. Zeng
拉曼光谱被认为是物质的特征，并已被广泛用于识别几类材料。移动的光谱仪的发展进一步扩展了拉曼光谱的应用，室内/室外和体内/体外测量都已在现场进行了评估。但有限的探测水平限制了它在高密度物质中的应用。在这里，我们报告了一个简单的银纳米粒子修饰的纳米多孔金（NanoAg@NPG）基板，它可以提供高增强的拉曼信号从附近的分子通过785 nm的光激发。这种增强归因于由相邻纳米颗粒以及NPG韧带和粘附的纳米颗粒构建的丰富的拉曼活性纳米间隙。该NanoAg@NPG基底显示出作为用于各种目标的可再现和可定量的近红外表面增强拉曼散射探针的巨大潜力，因为它在所谓的生物窗口中表现良好，该生物窗口可以避免来自可见光区域中的目标或周围环境的自发荧光和吸收。
Raman spectra are considered as signatures of matter and have been widely used to identify several classes of materials. The development of mobile spectrometers further extends applications of Raman spectroscopy, and both indoor/outdoor and in vivo/in vitro measurements have been evaluated on site. However, the finite detection level restricts its application in high density matters. Here we report a facile silver nanoparticle decorated nanoporous gold (NanoAg@NPG) substrate, which can provide high enhancement of the Raman signal from nearby molecules by 785 nm photoexcitation. This enhancement is attributed to the abundant Raman-active nanogaps constructed by adjacent nanoparticles and also by the NPG ligaments and adhered nanoparticles. This NanoAg@NPG substrate shows great potential as a reproducible and quantifiable near infrared surface-enhanced Raman scattering probe for various targets, since it performs well in the so-called biological window which can avoid autofluorescence and absorption either from targets or surroundings in the visible optical region.