FePt nanoparticle adsorption on a chemically patterned silicon-gold substrate

Chemically modified patterns were used to achieve selective adsorption of magnetic FePt nanoparticles on substrates. In this work, thiol chemistry was used to create chemical patterns on silicon surfaces and gold patterned silicon surfaces. The adsorption of FePt nanoparticles on the silicon and gold patterned surface was studied using FTIR and HRSEM (high-resolution scanning electron microscopy). We have demonstrated in this work that chemical patterning can be used to achieve selective adsorption of magnetic nanoparticles on surfaces. Our results indicate that FePt nanoparticles coated with a 2 nm thick surfactant layer will adsorb when spin-coated onto gold surfaces modified with 11-mercapto-1-undecanol {HS(CH2)(11)OH, MDOL}. The adsorption of nanoparticles was confirmed by FTIR spectra and HRSENI. FTIR spectra revealed the presence of peaks at 3004 cm(-1) and 1709 cm(-1) on MDOL modified gold surfaces, which are indicative of the presence of the FePt nanoparticles on the surface. Adsorption of FePt nanoparticles was not observed on I-octadecanethiol {CH3(CH2)(17)SH, ODT} modified gold surfaces. (c) 2006 Elsevier B.V. All rights reserved.