[1
]UNAM—National Nanotechnology Research CenterInstitute of Materials Science and NanotechnologyBilkent
University 6800 Ankara Turkey
[2
]Department of Electrical and Electronics EngineeringBilkent University 06800 Ankara
Turkey
[3
]NANOTAM—Nanotechnology Research CenterBilkent University 06800 Ankara Turkey
[4
]Chemistry DepartmentKoc University Istanbul 34450 Turkey
[5
]TUPRAS Energy Center (KUTEM)Koc University Istanbul 34450 Turkey
[6
]Department of ChemistryFaculty of ScienceBilkent University 06800 Ankara Turkey
[7
]Department of PhysicsFaculty of ScienceBilkent University 06800 Ankara Turkey