Abstract
A nanoparticle-coated graphite target (NCGT) is presented to improve the analysis accuracy and stability of laser-induced breakdown spectroscopy (LIBS). A stable, relatively homogeneous, and close to optically thin laser-induced breakdown plasma was obtained by dispersing sample nanoparticles on a high-purity graphite substrate. Spectral structures dominated by the characteristic lines of carbon and the samples can greatly simplify spectral identification and avoid line interference. To maximize the analysis accuracy and stability, a series of experimental conditions were optimized step by step according to the spectral intensity and signal-to-noise ratio of the lines. Based on the final optimized conditions, the relative standard deviation values of Mg, Fe, and Sr elemental content in Chinese medicinal material (CMM) samples were reduced from 17.7, 16.6, 12.1% of the pressed target to 4.8, 9.5, and 4.5% of the NCGT, respectively. Comparisons with the inductively coupled plasma mass spectrometry (ICP-MS) results demonstrated that the present method has great potential for detection of LIBS.
Highlights
In recent decades, there has been a burst of enthusiasm for the fundamental studies of laserinduced breakdown spectroscopy (LIBS) and its applications to many analytical fields because of its advantages of limited sample preparation, multi-elemental analysis, and its capability for remote and in-situ analysis of materials in any phase [1–3]
Our aim is to develop an analytical procedure to promote analysis efficiency of elements contained in the Chinese medicinal material (CMM) samples based on the high-purity graphite targets
High-purity graphite targets are considered to be an ideal matrix for nanoparticle-enhanced laser-induced breakdown spectroscopy (LIBS) due to their simple spectral structure
Summary
There has been a burst of enthusiasm for the fundamental studies of laserinduced breakdown spectroscopy (LIBS) and its applications to many analytical fields because of its advantages of limited sample preparation, multi-elemental analysis, and its capability for remote and in-situ analysis of materials in any phase [1–3]. Benefit from the advantages of sensitive and rapid spectral technology [4–7], LIBS as a rapid analytical tool with great potential for determining the elemental composition of materials in the solid, liquid, and gaseous states, many investigations on the spectral stability [8, 9], data processing [10, 11, 12] have recently been developed and reported. Nanoparticle Enhanced LIBS just requires a minimum sample preparation that is the deposition of nanoparticle on the sample surface [17, 18]. Only few investigations have focused on the effect of this phenomenon due to the influence of various factors such as matrix effect.
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