Toward surface-enhanced Raman scattering using electroless substrate for trace arsenic detection and speciation

被引:7
作者
Adier, Marie [1 ]
Jurdyc, Anne-Marie [1 ]
Hurel, Charlotte [2 ]
Goutaland, Francois [3 ]
Michalon, Jean-Yves [3 ]
Merlen, Alexandre [4 ]
Dussardier, Bernard [2 ]
Vouagner, Dominique [1 ]
机构
[1] Univ Lyon 1, Inst Lumiere Matiere ILM, CNRS, UMR5306, F-69622 Villeurbanne, France
[2] Univ Cote dAzur, Inst Phys Nice INPHYNI, CNRS, UMR 7010, Nice, France
[3] Univ Jean Monnet, Lab Hubert Curien LabHC, UMR 5516, F-42000 St Etienne, France
[4] Univ Toulon & Var, Aix Marseille Univ, Inst Mat Microelect Nanosci Provence IM2NP, UMR 7334, Toulon, France
关键词
METHYLENE-BLUE; PLASMON RESONANCE; SERS; ROUGHNESS; FILMS; FIELD;
D O I
10.1063/5.0126372
中图分类号
O59 [应用物理学];
学科分类号
摘要
Arsenic is one of the most toxic elements present in the environment, especially in water. The World Health Organization (WHO) recommends a maximum concentration of arsenic in drinkable water of 10 mu g/l (10 ppb). Sensors implementing Surface Enhanced Raman Scattering (SERS) can detect chemical species at low concentrations. The aim of this study is to compare two kinds of silver-coated SERS substrates for detection and speciation of trace, trivalent and pentavalent, inorganic arsenic compounds. One type of substrate was prepared by a classical thermal evaporation technique, and the second type by an electroless process. The thermally evaporated substrates allowed the detection of As(III) only, at a limit of detection (LOD) of approximately 50 mg/l, whereas As(V) could not be detected at any analyte concentration. The electroless substrates allow one to differentiate As(III) and As(V) with a LOD 1 mu g/l (1 ppb) equal for each valency, below the WHO recommendation. The electroless substrates show a very large sensitivity across up to five orders of magnitude in terms of analyte concentration. Although the SERS intensity shows a nonlinear behavior over this range of concentrations, these preliminary results are encouraging in the framework of the demonstration of trace As SERS sensors in drinkable water.
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页数:10
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