Tunca, Şensu
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.


Highly stable silver–platinum core–shell nanowires for H2O2 detection
Koylan, Serkan; Polat, Gökhan; Durukan, Mete Batuhan; Kalay, Yunus Eren; Ünalan, Hüsnü Emrah (2021-07-01)
Silver nanowire (Ag NW) networks have great potential to replace commercial transparent conducting oxides due to their superior properties in conjunction with their competitive cost, availability and mechanical flexibility. However, there are still challenges to overcome for the large scale utilization of Ag NWs in devices due to oxidation/sulfidation of NWs, which leads to performance loss. Here, we develop a solution-based strategy to deposit a thin platinum (Pt) shell layer (15 nm) onto Ag NWs to improve...
High-performance, bare silver nanowire network transparent heaters
Ergun, Orcun; Coskun, Sahin; Yusufoglu, Yusuf; Ünalan, Hüsnü Emrah (IOP Publishing, 2016-11-04)
Silver nanowire (Ag NW) networks are one of the most promising candidates for the replacement of indium tin oxide (ITO) thin films in many different applications. Recently, Ag-NW-based transparent heaters (THs) showed excellent heating performance. In order to overcome the instability issues of Ag NW networks, researchers have offered different hybrid structures. However, these approaches not only require extra processing, but also decrease the optical performance of Ag NW networks. So, it is important to i...
Core/shell copper nanowire networks for transparent thin film heaters
Tigan, Dogancan; Genlik, Sevim Polat; İmer, Muhsine Bilge; Ünalan, Hüsnü Emrah (IOP Publishing, 2019-08-09)
Copper nanowires (Cu NWs) appear as the strongest alternative to silver nanowires (Ag NWs) in transparent conductors. Cu NWs; however, are more prone to oxidation compared to Ag NWs even at room temperature. This problem becomes more severe when Cu NWs are used as transparent thin film heaters (TTFHs). In this work, we have utilized ALD deposited zinc oxide (ZnO) shell layers, and provide a comparison with typically used aluminum oxide (Al2O3) shell layers to improve the TTFH performance. While Cu NW networ...
Optimization of silver nanowire networks for polymer light emitting diode electrodes
Coskun, Sahin; Ates, Elif Selen; Ünalan, Hüsnü Emrah (IOP Publishing, 2013-03-29)
Silver nanowire (Ag NW) networks are promising candidates for replacement of indium tin oxide (ITO). However, transparent conductors based on Ag NW networks often suffer from 'haziness' resulting from surface roughness. Thus, in addition to achieving suitable transparency and conductivity, surface roughness must be minimized if realistic implementation of Ag NW networks as transparent conductors is to be realized. In this work, we have reduced the surface roughness of Ag NW networks to below 5 nm as compare...
Stable and efficient colour enrichment powders of nonpolar nanocrystals in LiCl
Erdem, Talha; SORAN ERDEM, ZELİHA; Sharma, Vijay Kumar; Keleştemur, Yusuf; Adam, Marcus; Gaponik, Nikolai; Demir, Hilmi Volkan (2015-01-01)
In this work, we propose and develop the inorganic salt encapsulation of semiconductor nanocrystal (NC) dispersion in a nonpolar phase to make a highly stable and highly efficient colour converting powder for colour enrichment in light-emitting diode backlighting. Here the wrapping of the as-synthesized green-emitting CdSe/CdZnSeS/ZnS nanocrystals into a salt matrix without ligand exchange is uniquely enabled by using a LiCl ionic host dissolved in tetrahydrofuran (THF), which simultaneously disperses these...
Citation Formats
Ş. Tunca, “SILVER-PLATINUM CORE-SHELL NANOWIRES FOR ELECTROCHEMICAL APPLICATIONS,” M.S. - Master of Science, Middle East Technical University, 2021.