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Abstract: Binding features found in biological systems can be implemented into man-made materials to design nano-structured artificial receptor matrices suitable e.g. for chemical sensing applications. A range of different non-covalent interactions can be utilized based on the chemical properties of the respective analyte. One example is the formation of coordinative bonds between a polymerizable ligand (e.g. N-vinyl-2-pyrrolidone) and a metal ion (e.g. Cu(II)). Optimized molecularly imprinted sensor layers lead to selectivity factors of at least two compared to other bivalent ions. In the same way, H-bonds can be utilized for such sensing purposes, as shown in the case of E.coli. The respective MIP leads to the selectivity factor of more than five between W and B strain respectively. Furthermore, nanoparticles with optimized Pearson hardness allow for designing sensors to detect organic thiols in air. The "harder" MoS2 yields only about 40% of the signals towards octane thiol as compared to the "softer" Cu2S. However, both materials strongly prefer molecules with -SH functionality over others, such as hydrocarbon chains. Finally, selectivity studies with wheat germ agglutinin (WGA) reveal that artificial receptors yield selectivities between WGA and bovine serum albumin that are only about a factor of two smaller than natural ligands.
Template and target information: Review - biomimetic materials for sensing