Laser-induced breakdown spectroscopy 2d distribution mapping of quantum dots
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| Year of publication | 2016 |
| Type | Appeared in Conference without Proceedings |
| MU Faculty or unit | |
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| Description | Laser-Induced Breakdown Spectroscopy (LIBS) has been widely used in modern analytical chemistry, it shown the growing number of users in different fields of element study from using at cultural heritage, geochemistry, remote sensing, industrial process monitoring, the analysis of bio-samples and recycling to environmental monitoring. This method is so popular because it offers a series of advantages such as fast response, applicability to any type of sample, practically no sample preparation, remote sensing capability, speed of analysis and the main advantage is the possibility of investigation of the elemental spatial distribution. The use of quantum dots (QDs) as probes for bioanalytical applications is a highly promising technique because fluorescence-based techniques are very sensitive. QDs seem to show the greatest promise as labels for tagging and imaging in biological systems. In our study suitable procedure for injection of QDs onto a different substrate and optimization of these particles detection using LIBS was focused to achieve the best spatial resolution and the lowest detection limits. Dependence of the LIBS signal intensity on the different parameters was investigated. The technique described in this poster presentation allows detection of QDs injected on the silica gel spread on aluminum foil or filtration paper. Commercially available table-top LIBS system with software controlled stages in x and y directions was used. The prepared substrates with injected QDs were placed into a lab-made holder. Experimental conditions, as gate delay, gate width, used energy of the laser, volume of applied suspension of QDs and their proper pretreatment and drying were studied. The feasibility of their 2D distribution mapping on the substrate by LIBS was examined in connection with the separation (or pre concentration) possibilities. LIBS can serve not only for detection of fluorescent QDs but also for nanoparticles which do not show any visible luminescence. |
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