Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Solution-based synthesis of silver-platinum core-shell nanowires with enhanced stability
Download
index.pdf
Date
2019
Author
Koylan, Serkan
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
291
views
185
downloads
Cite This
This work describes a facile route for the synthesis of silver (Ag)-platinum (Pt) core-shell nanowires (NWs) with controlled diameter in the range of 63-96 nm. Optimum synthesis conditions were determined to obtain conformal and galvanic replacement free deposition of Pt on Ag NWs. Synthesized Ag-Pt core-shell NWs were examined using SEM, TEM and XPS. Further studies were conducted to compare the performances of Ag-Pt core-shell NW networks to those of pristine Ag NW networks. In this regard, electrochemical, chemical and environmental stabilities were elaborated. Electrochemical stability tests were conducted in three electrode configuration comprised of Ag/AgCl reference, Pt plate counter and nanowire network working electrodes. In chemical stability tests, resistance change upon hydrogen peroxide exposure was monitored. The environmental stability tests were carried out under different relative humidity levels and temperatures. The humidity levels and temperatures were selected as 43, 75 and 84 %RH and 150 oC, 75 oC and room temperature, respectively. In all cases, clear improvement of stability for Ag-Pt core-shell NW networks were obtained. All in all, this highly effective and simple strategy to improve the stability vi of Ag NWs will certainly open new avenues for their large scale utilization in various optoelectronic devices.
Subject Keywords
Silver.
,
Silver-Platinum Core-Shell Nanowires
,
Environmental Stability
,
Electrochemical Stability .
URI
http://etd.lib.metu.edu.tr/upload/12623797/index.pdf
https://hdl.handle.net/11511/44082
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Laboratory determination of multicomponent effective diffusion coefficients for heavy metals in a compacted clay
Çamur, Mehmet Zeki; Yazıcıgil, Hasan (2005-01-01)
Diffusion and sorption of heavy-metal ions (Cd, Cr, Cu, Fe, K, Mn, Ni, Plb, and Zn) through an Ankara clay liner were studied experimentally. The Ankara clay consists of calcite, quartz, smectite and illite, and is a highly plastic inorganic clay with optimum weight water content of 32% and corresponding dry density of 1.413 g/cm(3). U nder optimum compaction conditions, effective porosity (volumetric water content) and hydraulic conductivity in the material were determined as 0.45 and 1.3 to 2.6x10(-9) cm/...
Thermal Analysis and Rheological Study of Ocma Type Bentonite Used in Drilling Fluids
Kök, Mustafa Verşan (2013-01-01)
In this research, Ocma type of bentonite sample was studied by x-ray diffraction, Fourier transform spectrophotometer, viscometer, differential scanning calorimeter, and thermogravimetry. It was observed that the major clay mineral was smectite and montmorillonite. Different band intervals were studied by Fourier transform spectrophotometer. The weight loss regions related to the dehydration and de-hydroxylation process were determined by differential scanning calorimeter and thermogravimetry at different h...
Numerical Solution and Stability Analysis of Transient MHD Duct Flow
Tezer, Münevver (2018-11-01)
This paper simulates the 2D transient magnetohydrodynamic (MHD) flow in a rectangular duct in terms of the velocity of the fluid and the induced magnetic field by using the radial basis function (RBF) approximation. The inhomogeneities in the Poisson’s type MHD equations are approximated using the polynomial functions (1+r) and the particular solution is found satisfying both the equations and the boundary conditions (no-slip and insulated walls). The Euler scheme is used for advancing the solution to ste...
Experimental determination of hydrodynamic dispersion coefficients for heavy metals using compacted clay
Camur, MZ; Yazıcıgil, Hasan (2001-07-27)
Mass transport of ions through the Ankara clay liner, which was prepared under three different compaction conditions, was studied experimentally on the basis of sorption, advection and hydrodynamic dispersion processes. Under optimum compaction conditions, effective porosity and hydraulic conductivity of the material were 0.32 and 0. 13-0.26 x 10(-8) cm s(-1), respectively. Effective diffusion coefficients of Cd, Cl, Cr, Cu, Fe, K, Mg, Mn, Ni, Pb and Zn ions were, respectively, 2.54, 9.51, 2.22, 2.85, 2.22,...
Ion implantation in confined, pinching metallic plasmas
Demokan, O; Marji, E (1999-02-15)
A series of preliminary experiments have been carried out to obtain a metallic arc discharge, in the form of an annular cylindrical column, carrying a current in the axial direction. To assert this geometry, a ring-shaped cathode is adopted and an arc formation is triggered by heating the cathode externally. The plasma, initially in the form of a cylindrical shell, is seen to be confined and pinched by its own magnetic field. The resulting, radially inward flux is observed to produce efficient and multidire...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
S. Koylan, “Solution-based synthesis of silver-platinum core-shell nanowires with enhanced stability,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Metallurgical and Materials Engineering., Middle East Technical University, 2019.