SILVER-PLATINUM CORE-SHELL NANOWIRES FOR ELECTROCHEMICAL APPLICATIONS

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2021-7

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Tunca, Şensu

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Silver nanowire (Ag NW) networks are one of the most outstanding candidates for optoelectronic applications to replace the commercial transparent conducting oxides (TCOs). Their high mechanical stability, solution based and scalable, low-cost synthesis and deposition routes make them an advantageous candidate over TCOs for future electronics. However, the integration of NW networks into electronic devices requires high thermal, chemical and electrochemical stability of NWs. This work describes the fabrication of highly stable silver-platinum (Ag-Pt) core-shell NW networks to be utilized in both amperometric hydrogen peroxide (H2O2) sensors and supercapacitors. Detailed morphological and structural characterization of the Ag-Pt core-shell NWs showed that conformal and galvanic replacement free Ag-Pt core-shell NWs were obtained. Ag-Pt core-shell NWs had superior stability in harsh H2O2 environments compared to bare Ag NWs. To examine the use of Ag-Pt core-shell NWs in H2O2 sensors, stability of Ag-Pt core-shell NWs against H2O2 was investigated. Following that, Ag-Pt core-shell NW based H2O2 sensors were fabricated and a sensitivity of 0.167 μA/μM, in the linear range of 8.16-160.60 μM with a detection limit of 4.75 μM in phosphate buffer (pH 7) medium was obtained from the fabricated sensors. For the fabrication of supercapacitors, Ag-Pt core-shell NW networks were electrochemically deposited with nickel hydroxide (Ni(OH)2). The prepared Ag-Pt-Ni(OH)2 nanocomposite electrodes showed high stability during electrochemical measurements and a specific capacitance of 816.7 F/g at a current density of 5 A/g was obtained. Deposition of a conformal Pt shell layer improved the chemical and electrochemical stability of Ag NWs so that they can be used as electrodes for amperometric H2O2 sensors and supercapacitors. The succesfully demonstrated applications of Ag-Pt core-shell NWs herein revealed the potential of these materials for their use in other optoelectronic and energy devices.

Subject Keywords

Silver-Platinum Core-Shell Nanowires, Amperometric H2O2 Sensors, Supercapacitors

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https://hdl.handle.net/11511/91434

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ş. Tunca, “SILVER-PLATINUM CORE-SHELL NANOWIRES FOR ELECTROCHEMICAL APPLICATIONS,” M.S. - Master of Science, Middle East Technical University, 2021.