福瑞姆
纳米棒
检出限
二硫代氨基甲酸盐
表面等离子共振
分析化学(期刊)
胶体金
拉曼光谱
化学
材料科学
核化学
纳米颗粒
纳米技术
色谱法
杀虫剂
光学
有机化学
物理
生物
农学
作者
Benjamin Saute,Ranjith Premasiri,L. D. Ziegler,Radha Narayanan
出处
期刊:Analyst
[The Royal Society of Chemistry]
日期:2012-01-01
卷期号:137 (21): 5082-5082
被引量:139
摘要
We report the use of gold nanorods as solution-based SERS substrates for the detection of ultralow-levels of three different dithiocarbamate fungicides: thiram, ferbam and ziram. Gold nanorods are attractive to use as SERS substrates due to the ability to tune the surface plasmon resonance of the nanoparticles to the laser excitation wavelength of the Raman spectrometer equipped with a 785 nm diode laser. The gold nanorods are synthesized using a seed-mediated growth method and characterized using UV-Visible spectroscopy, zeta potential, and TEM. The gold nanorods have an aspect ratio of 2.19 ± 0.21 and have an average length of 37.81 ± 4.83 nm. SERS spectra are acquired at different concentrations of each fungicide and calibration curves are obtained by monitoring the intensity of the band arising from the ν(C–N) stretching mode coupled to the symmetric δ(CH3) motion. The limits of detection and limits of quantitation are obtained for each fungicide. The limits of detection are 11.00 ± 0.95 nM, 8.00 ± 1.01 nM, and 4.20 ± 1.22 nM for thiram, ferbam, and ziram respectively. The limits of quantitation are 34.43 ± 0.95 nM, 25.61 ± 1.01 nM, and 12.94 ± 1.22 nM for thiram, ferbam, and ziram respectively. It can be seen that the three different dithiocarbamates can be detected in the low nM range based on the limits of detection that are achieved.
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