A WSe2@poly(3,4-ethylenedioxythiophene) nanocomposite-based electrochemical sensor for simultaneous detection of dopamine and uric acid

In the present work, a nanocomposite of two-dimensional WSe2 nanosheets with poly(3,4‑ethylenedioxythiophene (WSe2@PEDOT) was prepared by facile hydrothermal method and characterized in terms of structural and morphological analyses. This nano­composite was used to modify glassy carbon electrode for the construction of an electrochemical sen­sing platform for simultaneous determination of dopamine (DA) and uric acid (UA) in the presence of ascorbic acid (AA). It was found that the incorporation of PEDOT into WSe2 nano­sheets exhibited enhanced electrochemical behaviors and electro¬catalytic activity against DA and UA. Using differential pulse voltammetry (DPV) measurements, the WSe2@PEDOT modified electrode displayed wide linear detection ranges of 16 to 466 µM for DA and 20 to 582.5 µM for UA. The electrode also exhibited high selectivity against DA and UA in the presence of major interference of ascorbic acid and other interferent substances

4-Carboxybiphenyl and thiophene substituted porphyrin derivatives for dye-sensitized solar cell

WOS: 000388605400010Porphyrin sensitizer (Por) containing 4-carboxybiphenyl and 2-thienyl and its metallated Zn(II) derivative (ZnPor) were synthesized and investigated. The porphyrin dyes were characterized by MALDI-MS, H-1 NMR, UV-vis, fluorescence and cyclic voltammetry methods. It was found that using of biphenyl bridge between anchoring group and porphyrin core enhanced the conjugation length of the porphyrin macrocycle. The new porphyrin dyes were used as sensitizers in dye-sensitized solar cells (DSSCs). ZnPor-based dye sensitized solar cells yielded a short circuit photocurrent density of 3.98 mA cm(-2), an open circuit voltage of 500 mV, and a fill factor of 0.67, corresponding to an overall conversion efficiency (eta) of 1.33%

Asymmetric phthalocyanine derivatives containing 4-carboxyphenyl substituents for dye-sensitized solar cells

WOS: 000346543200060The synthesis of two asymmetrical zinc (II) phthalocyanines (ZnPcs) containing 4-carboxyphenyl and 3-thienyl or 5'-hexyl-2,2'-bithiophene substituent was described. These Zinc Phthalocyanines were synthesized by a statistical condensation reaction between two different phthalonitriles. Each of the phthalonitrile precursors was accomplished by the Suzuki-Miyaura cross-coupling reactions with the aryliodide and corresponding botanic acids. The ZnPc dyes were characterized by MALDI-MS, FT-IR, H-1 NMR, UV-Vis, fluorescence and cyclic voltammetry methods. Compared with 3-thienyl substituted ZnPc-1 dye, the Q-band absorption of 5'-Hexyl-2,2'-bithiophene substituted ZnPc-2 was red-shifted by 13 nm because of the extension of pi-system. The ZnPc dyes were used as sensitizers in dye-sensitized solar cells (DSSCs). ZnPc-2 sensitized solar cell devices using a 7 (transparent) 5 (scattering) gm thin TiO2 layer yielded a short-circuit photocurrent density of 3.81 mA/cm(2), an open-circuit voltage of 500 mV, and a fill factor of 0.59, corresponding to an overall conversion efficiency of 1.12% under standard AM 1.5 sun light. (C) 2014 Elsevier Ltd. All rights reserved.Suleyman Demirel University, Scientific Research ProjectsSuleyman Demirel University [2950-D-11]This work was supported financially by the grant of Suleyman Demirel University, Scientific Research Projects (2950-D-11)

Polyfuran-based multi-walled carbon nanotubes and graphene nanocomposites as counter electrodes for dye-sensitized solar cells

WOS: 000429485300024The preparation of polyfuran-graphene (PFu/GR) and polyfuran-multi-walled carbon nanotube (PFu/MWCNT) nanocomposites was carried out via a plasma polymerization. The characterizations of the pure GR, MWCNTs and the nanocomposites coated with PFu were performed using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy analyses. Counter electrodes prepared using the nanocomposites were used in dye-sensitized solar cells (DSSCs), demonstrating an enhancement in cell performance. The maximum efficiency of the DSSC with the PFu/GR counter-electrode with a short-circuit photocurrent density of 32.26 mA/cm(2) was 5.06%, which is much higher than that of the short-circuit photocurrent density of 14.11 mA/cm(2) and efficiency of 2.13% in the cell using the GR counter electrode. This was attributed to the enhanced conductivity between the PFu-based counter electrode and the electrolyte.Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [114M867]; bilateral Project SAS-TUBITAK JRP; VEGA 02/0149/14This work was supported by The Scientific and Technological Research Council of Turkey (TUBITAK; Project No. 114M867) and by the bilateral Project SAS-TUBITAK JRP 2014/2. Work was partially supported by the Project VEGA 02/0149/14 (Slovakia). Sule Erten-Ela acknowledges the Alexander von Humboldt foundation and Turkish Academy of Sciences (TUBA)