使用种子生长法合成出两种双金属核壳结构的纳米银方块:银包金棒纳米长方块(AuNR@Ag NCs)和银包金颗粒纳米方块(AuNS@Ag NCs),并将两种材料作为表面增强拉曼散射光谱(SERS)基底。随后利用结晶紫(CV)作为拉曼探针分子和塑化剂邻苯二甲酸丁基苄酯(BBP)分别考察两组材料的SERS性能,优选出AuNR@Ag NCs为检测塑化剂的最优基底。结果表明:两组材料形貌均匀规则,壳层厚度相近。AuNR@Ag NCs基底因其独特的结构从而产生了横向与纵向的局域表面等离子体共振(LSPR),相较于AuNR@Ag NCs基底能够产生更多的热点,拥有更强的SERS性能。同时,AuNR@Ag NCs基底具有良好的灵敏度与重复性,对BBP的检测限可达到10-9mol/L,并且白酒中添加中毒剂量(1.3mg/kg)的BBP也能够成功检测出,该基底与SERS的结合有望实现酒水中塑化剂的快速灵敏检测。
It was proposed to synthesize two kinds of core-shell nano-silver cubes by seed growth method:Au nanorod@Ag nanocubes (AuNR@Ag NCs) and Au nanosphere@Ag nanocubes (AuNS@Ag NCs),and used two materials as the substrate for surface enhanced raman scattering spectroscopy (SERS).Subsequently,the crystal violet (CV) was used as the raman probe molecule and the plasticizer butyl benzyl phthalate (BBP) to investigate the sensitivity and repeatability of the two materials.Finally,The AuNR@Ag NCs was selected as the better substrate to detect the plasticizer.The results shown that the materials of the two groups were uniform,and the thickness of the shell was similar.The AuNR@Ag NCs substrate produced lateral and longitudinal localized surface plasmon resonance (LSPR) due to its unique structure,which produced more hot spots and stronger SERS performance than the AuNR@Ag NCs substrate.the AuNR@Ag NCs substrate had good sensitivity and repeatability,and the detection limit of BBP can reach 10-9mol/L.A poisoning dose (1.3mg/kg) BBP was added can also be successfully detected in the wine.The combination of the substrate and SERS was expected to achieve detecting plasticizer in the wine in fast and sensitive way.
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基金资助
2016年国家自然基金(51672004);2016年安徽省自然基金(1608085MH176);2018年安徽省科技攻关项目(1804h08020252)
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