title: Green synthesis and characterization of novel gold nanocomposites for electrochemical sensing applications.
abstract: Synthesis, characterization and application of Au-PANI-Calix and Au-PANI-Nap nanocomposites, is reported herein. An easy template free green synthesis is proposed and discussed for easy expediency. A variety of analytical techniques were used to characterize the nanocomposites: UV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Dynamic light scattering (DLS), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS) were used to characterize the nanocomposites. Surface morphology was studied by transmission electron microscopy (TEM). The nanocomposites were immobilized on screen-printed electrode and showed electroactivity in neutral pH, making them promising candidates for various analytical applications. A sensitive and selective detection of Cu(2+) was perceived on the Au-PANI-Calix modified electrode with no interference from ions K(+), Ni(2+), Co(2+), Pb(2+), Cr(3+) with a detection limit of 10nM. The copper detection is facilitated for accessible ligation with 4-sulfocalix[4]arene, so as the Cu(II)-Calix complex formed. The electrode modified with Au-PANI-Nap showed sensing application towards H2O2 with a detection limit of 1 μM. The modified electrodes were reproducible and stable for 2 months.
authors.affiliation: BioAnalytical and Nanobiomedicinal Laboratory, Department of Biochemical Science and Technology, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan; Department of Chemistry and Industrial Chemistry, University of Genoa, via Dodecaneso 31, Genoa 16146, Italy. Electronic address: shivani.shivani@edu.unige.it.
authors.forename: Shivani
authors.initials: S
authors.lastname: Tanwar
authors.forename: Ja-an Annie
authors.initials: JA
authors.lastname: Ho
authors.forename: Emanuele
authors.initials: E
authors.lastname: Magi
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D002021:Buffers; D047250:Calixarenes / Q000737:chemistry; D003300:Copper / Q000032:analysis*; D055664:Electrochemical Techniques; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D055772:Green Chemistry Technology; D006861:Hydrogen Peroxide / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D053761:Nanocomposites / Q000737:chemistry*; D009288:Naproxen / Q000737:chemistry
chemical_list: D000814:Aniline Compounds; D002021:Buffers; C416807:polyaniline; D047250:Calixarenes; D009288:Naproxen; D006046:Gold; D003300:Copper; D006861:Hydrogen Peroxide
keywords: Copper; Cyclic voltametry; Electrochemical sensor; Gold nanocomposite; Green synthesis; Hydrogen peroxide