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Self-Assembled Activated Carbon Nanoparticles for Reliable Time-Discretized Quantitative Surface-Enhanced Raman Spectroscopy

Abstract

Quantitative analysis is an important aspect of surface-enhanced Raman spectroscopy (SERS). However, due to change of enhancing performance of SERS substrates, it is difficult to obtain reliable analysis results. In this work, a reliabe quantitative method is introduced to overcome this problem by external standard method. To achieve external standard method, a self-assembled film of activated carbon nanoparticles is firstly prepared by air/liquid (KCl aqueous solution) interface. Next, the activated carbon film transferred onto the surface of Teflon slice (extraction film) is dipped into high concentration of analyte to achieve reliable saturated adsorption and the extraction film under saturated adsorption is called reference (exteranl standard). The uniformity is very good in one extraction film and thus the extraction film is cut into halves (used to prepare determinant and reference) to eliminate deviation of different batches. Saturated adsorption time of extraction film is different for different concentrations of analyte and concentration can be therefore quantified by saturated adsorption time. Because enhancing performance of SERS substrate is almost unchanged in a short time and all SERS measurements are conducted at similar measurement condition (saturated adsorption), SERS intensity of determinant and reference is almost the same under saturated adsorption. SERS intensity of determinant normalized by reference is therefore very stable and uniform (approximately equal to “1” under saturated adsorption). The preparation condition of determinand and reference is the same except concentration of analyte, thus interference can be eliminated by external standard method. Any perturbations caused by performance change of colloids substrates, can be therefore effectively overcome. Moreover, saturated adsorption time of extraction film for different concentrations of analyte has large time margin. This method is very simple and the cost is very low. Based on this method, a concept of time-discretized quantitative SERS (TDQ-SERS) is introduced. Thus, a reliable, simple, economic quantitative SERS technique can be achieved.

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Publication details

The article was received on 20 Sep 2017, accepted on 06 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7AY02254A
Citation: Anal. Methods, 2017, Accepted Manuscript
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    Self-Assembled Activated Carbon Nanoparticles for Reliable Time-Discretized Quantitative Surface-Enhanced Raman Spectroscopy

    Y. Liu, Z. Lu, W. Hasi, H. Zhao, B. lin and F. Yang, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY02254A

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