Microscopic electrochemical control of Ag nanoparticles into mesoporous TiO2 thin films

Sem informaçãoConductive-tip atomic force microscopy (CAFM) was used to explore the effects of high electric fields on silver nanoparticle (NP) arrays embedded inside the pores of mesoporous TiO2 thin films (MTF). A controlled local modification of the distribution of Ag nanoparticles inside the MTF and their electronic transport properties was carried out. The process is driven by strong electrochemically induced Ag+ migration and reduction inside the pores localized around the CAFM tip. Depending on the experimental parameters, we were able to induce drastic and violent changes, both at the surface and at the MTF/Si interface, that is, through the whole scanned region. Therefore, the results reported in this work contribute to the design and development of novel metal NP-based devices at the micro- and nanoscale.123635793587Sem informaçãoSem informaçãoSem informaçãoThe authors acknowledge financial support received from ANPCyT (PICT 2008-1345 and PICT 2012-1506) and UNSAM (SJ10/20). We thank A. Wolosiuk for fruitful discussions and S. J. Luduena and M. C. Marchi for the SEM images obtained at CMA belonging to the Sistema Nacional de Microscopia (MINCYT). M.C.F., A.Z., F.G., P.E.L., G.J.A.A.S.I., and L.P.G. are CONICET staff members