Abstract
A generic electrochemical approach has been employed to synthesize, fabricate, and characterize 2-D/3-D anorod/nanowire bundles of semiconducting/magnetic Fe[TCNQ](2)(H2O)(2) material. The redox-based TCNQ/Fe[TCNQ](2)(H2O)(2) solid-solid phase transformation utilizes the one-electron reduction of TCNQ-modified electrodes coupled with ingress of Fe-(aq)(2+) ions, from bulk. solution, into the reduced TCNQ crystal lattice via a nucleation-growth process. The reverse oxidation process, involving Fe[TCNQ](2)(H2O)(2)/TCNQ transformation, also proceeds via an analogous nucleation-growth mechanism. The overall chemically reversible solid-solid transformation therefore can be represented by the reaction TCNQ((S))(0) + 2e(-) + Fe-(aq)(2+) + 2H(2)O reversible arrow {Fe[TCNQ](2)(H2O)(2)}(S). SEM monitoring of the transformation process revealed substantial differences in both the morphology and crystal size of electrochemically produced Fe[TCNQ](2)(H2O)(2) material and the parent TCNQ crystals. Importantly, this electrochemical approach provides facile access to fabricate and manipulate the morphology of Fe[TCNQ](2)(H2O)(2) on conducting (Au, Pt, glassy carbon) and semiconducting (indium tin oxide) surfaces. Other aspects of the solid-solid electrochemical conversion have been probed by voltammetric, spectroscopic, and other surface science techniques.