Department of Analytical Chemistry, University of Córdoba, E-14071 Córdoba, Spain.
Anal Chim Acta. 2013 Jul 25;788:122-8. doi: 10.1016/j.aca.2013.06.008. Epub 2013 Jun 19.
The paper proposes a simple and portable approach for the surface enhanced Raman scattering (SERS) spectroscopy in situ determination of carboxylated single walled carbon nanotubes (SWNTs) in river water samples. The method is based on the subsequent microfiltration of a bare gold nanoparticles solution and the water sample containing soluble carbon nanotubes by using a home-made filtration device with a small filtration diameter. An acetate cellulose membrane with a pore size of 0.2 μm first traps gold nanoparticles to form the SERS-active substrate and then concentrates the carbon nanotubes. The measured SERS intensity data were closely fit with a Langmuir isotherm. A portable Raman spectrometer was employed to measure SERS spectra, which enables in situ determination of SWNTs in river waters. The limit of detection was 10 μg L(-1). The precision, for a 10 mg L(-1) concentration of carbon nanotubes, is 1.19% intra-membrane and 10.5% inter-membrane.
本文提出了一种简单便携的方法，用于通过表面增强拉曼散射（SERS）光谱原位测定河水中羧基化单壁碳纳米管（SWNTs）。该方法基于随后用自制的具有小过滤直径的过滤装置对载金纳米粒子溶液和含有可溶性碳纳米管的水样品进行微滤。具有 0.2μm 孔径的醋酸纤维素膜首先捕获金纳米粒子以形成 SERS 活性基底，然后浓缩碳纳米管。测量的 SERS 强度数据与朗缪尔等温线密切吻合。便携式拉曼光谱仪用于测量 SERS 光谱，从而能够在现场测定河水中的 SWNTs。检测限为 10μg L(-1)。对于 10mg L(-1)浓度的碳纳米管，其精密度为膜内 1.19%和膜间 10.5%。
