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High quality gold nanorods and nanospheres for surface-enhanced Raman scattering detection of 2,4-dichlorophenoxyacetic acid

机译:用于表面增强拉曼散射检测的2,4-二氯苯氧基乙酸的高质量金纳米棒和纳米球

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Nearly monodisperse Au nanorods (NRs) with different aspect ratios were separated from home-synthesized polydisperse samples using a gradient centrifugation method. The morphology, size and its distribution, and photo-absorption property were analyzed by transmission electron microscopy, atomic force microscopy and UV-visible spectroscopy. Subsequently, using colloidal Au NRs (36.2 nm ×10.7 nm) with 97.4% yield after centrifugation and Au nanospheres (NSs) (22.9 ± 1.0 nm in diameter) with 97.6% yield as Au substrates, surface-enhanced Raman scattering (SERS) spectra of 2,4-dichlorophenoxyacetic acid (2,4-D) were recorded using laser excitation at 632.8 nm. Results show that surface enhancement factors (EF) for Au NRs and NSs are 6.2 × 10~5 and 5.7 × 10~4 using 1.0 × 10~(-6) M 2,4-D, respectively, illustrating that EF value is a factor of ~10 greater for Au NRs substrates than for Au NSs substrates. As a result, large EF are a mainly result of chemical enhancement mechanisms. Thus, it is expected that Au NPs can find a comprehensive SERS application in the trace detection of pesticide residues.
机译:使用梯度离心法将具有不同长宽比的几乎单分散的Au纳米棒(NRs)与家庭合成的多分散样品分离。通过透射电子显微镜,原子力显微镜和紫外可见光谱分析了形态,尺寸和分布以及光吸收性能。随后,使用胶体化的Au NRs(36.2 nm×10.7 nm)离心后产率为97.4%,使用Au纳米球(NSs)(直径为22.9±1.0 nm)作为Au底物,其产率为97.6%,表面增强拉曼散射(SERS)光谱使用632.8 nm的激光激发记录了2,4-二氯苯氧基乙酸(2,4-D)的记录。结果表明,使用1.0×10〜(-6)M 2,4-D时,Au NR和NS的表面增强因子(EF)分别为6.2×10〜5和5.7×10〜4,表明EF值为a Au NRs底物比Au NSs底物大约10倍。结果,大EF是化学增强机制的主要结果。因此,预计金纳米颗粒可以在农药残留的痕量检测中找到全面的SERS应用。

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