Detection of nitroaromatic compounds on functionalized silicon nanotextures. A.Yu. MIRONENKO, M.V. TUTOV, S.O. GURBATOV, A.A. KUCHMIZHAK

Abstract

Detection of nitroaromatic compounds on functionalized silicon nanotextures. A.Yu. MIRONENKO, M.V. TUTOV (Institute of Chemistry, FEB RAS, Vladivostok), S.O. GURBATOV, A.A. KUCHMIZHAK (Institute of Automation and Control Processes, FEB RAS, Vladivostok).

This paper confirms the hypothesis that direct laser processing of silicon substrate using nano- and femtosecond (fs) laser pulses in an anhydrous non-oxidizing medium containing a functionalizing agent (fluorophore with a vinyl functional group) allows simultaneous texturing and covalent functionalization of its surface. This idea was implemented in the creation of so-called laser-induced periodic surface structures (LIPSS) as a result of direct ablation of bulk crystalline silicon in the solution of N-vinylcarbazole in toluene. It has been shown that laser processing using linearly polarized fs laser pulses makes it possible to obtain LIPSS with a covalently functionalized surface due to the occurrence of a photoinduced hydrosilylation reaction. Unique structures with hierarchical roughness (and, as a consequence, antireflective properties), functionalized with a sensory fluorophore, exhibit excellent sensory characteristics due to the realization of surface-enhanced fluorescence. Using N-vinylcarbazole as a functionalizing agent, we demonstrate a one-step fabrication of a highly sensitive (detection limit 40 nM) sensor for the detection of nitrobenzene in water.