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Unwrapping the compositional mystery of Eumeninae nest: A laser-induced breakdown spectroscopic study
1Department of Optoelectronics, University of Kerala, Trivandrum, 695581, Kerala, India.
Abstract:
The nest of Eumeninae wasp is one of nature's creations, revealing the mysterious architectural beauty through its composition and nanostructuring. The present study unveils the compositional mystery of Eumeninae nest through the signal processing of the laser-induced breakdown spectrum (LIBS). The structure, morphological, and optical characterisations of the nest sample shows nanoparticles of oxides of silicon, aluminium, and iron with an optical bandgap of 2.5 eV, giving a fluorescence emission in the blue region upon ultraviolet excitation. Though, the energy dispersive spectroscopic study confirms the major elements present in the sample, the more elements are revealed through LIBS analysis. The intriguing properties of nest is attributed to the elemental compositions - oxygen, silicon, iron, manganese, chromium, cobalt, calcium and carbon - which necessitate deconvolution of peaks in the spectra for estimating the plasma temperature (4300-5045 K) and electron density (1.13 × 10-19 cm-3).
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