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首页> 外文期刊>Applied Surface Science >Graphene oxide-silver nanocomposite as SERS substrate for dye detection: Effects of silver loading amount and composite dosage
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Graphene oxide-silver nanocomposite as SERS substrate for dye detection: Effects of silver loading amount and composite dosage

机译：氧化石墨烯-银纳米复合材料作为用于染料检测的SERS底物：银负载量和复合剂量的影响

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Hybrid of graphene or graphene oxide (GO) with gold or silver nanoparticles (AgNPs) as substrate for SERS detection often brings large background and low signal to noise ratio, which leads to poor sensitivity. In this study, it is proposed that the silver loading amount on GO and dosage of GO-Ag composite have significant influence on its SERS activity (SERS signal intensity and signal to noise ratio). The adsorption ability and SERS activity of GO-Ag composite for several dye molecules were investigated in detail. It was found increasing the dosage of GO-Ag or AgNPs loading on GO always enhances its absorption to dye molecules, while in both cases the SERS signal first increase and then decrease. The reason for this fluctuation of SERS signal was investigated and discussed, which indicate high silver loading amount leads to enhanced background response, while high composite dosage could decrease the signal of target molecule. Finally, an optimized GO-Ag substrate providing strong SERS signal and high signal to noise ratio was used for the detection of several dye molecules by SERS with the lowest detectable concentration down to 1 mu M. Our results indicated that great caution should be paid on the silver loading amount and dosage of GO-Au/Ag when using GO-Au/Ag as SERS substrate for molecule sensing or comparing different results reported in reference. (C) 2015 Elsevier B.V. All rights reserved.
机译：石墨烯或氧化石墨烯（GO）与作为SERS检测底物的金或银纳米颗粒（AgNPs）的杂种通常带来大背景和低信噪比，导致灵敏度低。在这项研究中，建议GO上的银负载量和GO-Ag复合材料的用量对其SERS活性（SERS信号强度和信噪比）有显着影响。详细研究了GO-Ag复合材料对几种染料分子的吸附能力和SERS活性。发现增加GO上的GO-Ag或AgNPs的剂量总是会增强其对染料分子的吸收，而在两种情况下，SERS信号均先升高然后降低。研究和讨论了SERS信号波动的原因，这表明高银负载量导致增强的背景响应，而高复合剂量可以降低靶分子的信号。最后，使用具有强SERS信号和高信噪比的优化GO-Ag底物，通过SERS检测最低浓度至1μM的几种染料分子。我们的结果表明，应格外小心当使用GO-Au / Ag作为SERS底物进行分子传感或比较参考文献中报道的不同结果时，GO-Au / Ag的银负载量和剂量。 （C）2015 Elsevier B.V.保留所有权利。

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