Oxidative chemical vapor deposition (oCVD) of patterned and functional grafted conducting polymer nanostructures

Journal of Materials Chemistry (Impact Factor: 6.63). 01/2010; 20:3968--3972. DOI: 10.1039/B925736E

ABSTRACT We present a simple one-step process to simultaneously create patterned and amine functionalized biocompatible conducting polymer nanostructures, using grafting reactions between oxidative chemical vapor deposition (oCVD) PEDOT conducting polymers and amine functionalized polystyrene (PS) colloidal templates. The functionality of the colloidal template is directly transferred to the surface of the grafted PEDOT, which is patterned as nanobowls, while preserving the advantageous electrical properties of the bulk conducting polymer. This surface functionality affords the ability to couple bioactive molecules or sensing elements for various applications, which we demonstrate by immobilizing fluorescent ligands onto the PEDOT nanopatterns. Nanoscale substructure is introduced into the patterned oCVD layer by replacing the FeCl3 oxidizing agent with CuCl2.

1 Follower
  • [Show abstract] [Hide abstract]
    ABSTRACT: Three-dimensional (3D) poly(3,4-ethylenedioxythiophene) (PEDOT) films were demonstrated as an efficient Pt-free catalyst in dye-sensitized solar cells (DSSCs). The 3D PEDOT films were fabricated by the deposition of a polystyrene (PS) bead (diameter = 1 mu m) monolayer on fluorine-doped tin oxide (FTO) glass, followed by electrochemical polymerization (EP) of ethylenedioxythiophene (EDOT) monomer. For comparison, a flat PEDOT film and Pt counter electrodes were additionally prepared by solution casting polymerization (SCP) and the thermal reduction of a spin-coated H2PtCl6 solution, respectively. When these films were implemented as counter electrodes in quasi-solid-state DSSCs with a nanogel electrolyte, the cell efficiency of the 3D PEDOT film prepared by EP for 30sec reached 5.05%, which is higher than those of the flat PEDOT (4.11%) and Pt counter electrode (4.59%). The improved efficiency of the 3D PEDOT-based cell is attributed to its higher electrocatalytic performance and improved light reflectance, as determined by cyclic voltammogram (CV), incident photon-to-current efficiency (IPCE), and electrochemical impedance spectroscopy (EIS) analyses.
    Electrochimica Acta 08/2014; 137:34–40. DOI:10.1016/j.electacta.2014.05.134 · 4.09 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Chemical vapor deposition (CVD) of polymer films represent the marriage of two of the most important technological innovations of the modern age. CVD as a mature technology for growing inorganic thin films is already a workhorse technology of the microfabrication industry and easily scalable from bench to plant. The low cost, mechanical flexibility, and varied functionality offered by polymer thin films make them attractive for both macro and micro scale applications. This review article focuses on two energy and resource efficient CVD polymerization methods, initiated Chemical Vapor Deposition (iCVD) and oxidative Chemical Vapor Deposition (oCVD). These solvent-free, substrate independent techniques engineer multi-scale, multi-functional and conformal polymer thin film surfaces and interfaces for applications that can address the main sustainability challenges faced by the world today.
    Advanced Materials Interfaces 07/2014; 1(4). DOI:10.1002/admi.201400117
  • [Show abstract] [Hide abstract]
    ABSTRACT: We establish, for the first time, the concept that the morphology of deposited polymer nanomaterials is highly affected by substrate curvature, as well as synthetic conditions. Nanonodules and nanorods can be grown on a nanofiber surface by controlling critical kinetic factors (temperature and pressure) during vapor deposition polymerization, leading to the formation of multidimensional polymer nanostructures. On the other hand, no remarkable nanostructures were generated on bulk flat substrate under the same conditions. Multidimensional poly(3,4-ethylenedioxythiophene) (PEDOT) nanofibers were fabricated successfully, and their hollow nanostructures, namely nanotubes, were also obtained by a core-etching process. It is expected that the multidimensional conducting polymer nanomaterials will have advantages when used as structures for superhydrophobic coatings, adhesion enhancement, separation, and energy conversion/storage.
    Chemistry of Materials 10/2012; 24(21):4088–4092. DOI:10.1021/cm301972f · 8.54 Impact Factor