Covalent functionalization of polycrystalline silicon nanoribbons applied to Pb(II) electrical detection

Brice Le Borgne (1) , Aurelie Girard (2) , Christophe Cardinaud (2) , Anne-Claire Salaün (1) , Laurent Pichon (1) , Florence Geneste (3)

1 IETR - Institut d'Électronique et des Technologies du numéRique
2 IMN - Institut des Matériaux Jean Rouxel
3 ISCR - Institut des Sciences Chimiques de Rennes

Although recent studies in the field of nanomaterials have allowed the realization of highly sensitive sensors, research regarding new types of functionalization of nanostructures to reach high selectivity are still missing. Here, a simple electronic device based on polycrystalline silicon (poly-Si) nanoribbons used for lead detection is presented. This device is functionalized by reduction of aryl diazonium salts in order to detect heavy metals. The effectiveness of the grafting process and thickness homogeneity of the coating layer were evaluated by XPS and NanoSIMS techniques. The preconcentration of lead (Pb2+) at the surface of the functionalized nanostructures was substantially verified. Finally, electrical characterization of the resistors based on the functionalized nanoribbons, showed that the sensitivity to these species is increased in the concentration ranging from 10−7 to 10−5 mol L−1. This technique could pave the way for use of complexing agents to enhance heavy metal detection.

Keywords: Functionalization; Silicon nanoribbons; Aryl-diazonium salts; Chemical sensors

Domains: Chemical Sciences; Material chemistry; Chemical Sciences; Analytical chemistry

Brice Le Borgne, Aurelie Girard, Christophe Cardinaud, Anne-Claire Salaün, Laurent Pichon, et al.. Covalent functionalization of polycrystalline silicon nanoribbons applied to Pb(II) electrical detection. Sensors and Actuators B: Chemical, 2018, 268, pp.368-375. ⟨10.1016/j.snb.2018.04.138⟩. ⟨hal-01808899v2⟩