%0 Journal Article %T Voltammetric determination of 4-nitrophenol using a modiļ¬ed carbon paste electrode based on a new synthetic crown ether/silver nanoparticles %A Ronaghi, Gholam Hossein %A Mohammadzadekakhki, Roya %A Azizi Toupkanloo, Hossein %J Materials Science and Engineering C %@ 0928-4931 %D 2012