Peeling of Chemical Vapour Deposition Graphene Grown on Platinum and Copper foils using Alkaline Solutions for Reuseable Substrates

2015-04-10
Karamat, Shumaıla
Sonusen, Selda
Çelik, Ümit
Uysallı, Yiğit
Oral, Ahmet
Graphene, the wonder material, has gained worldwide scientific attention since its experimental existence in 2004. Its sp-2 bonded carbon atoms are arranged in a two dimensional honeycomb lattice which exhibits high intrinsic carrier mobility, transparency, and tensile strength. Chemical vapour deposition (CVD) is the most opted technique because of its potential for large area graphene growth. During CVD growth at high temperatures, the surface of the metal catalyst becomes rough due to surface reconstruction and graphene follow the underlying surface. It is advisable to utilize a delicate method for graphene transferring from the metallic catalyst to the appropriate substrate. The etchants like Iron Chloride and Iron Nitrate solutions were mostly used for etching metal catalyst which also leave metal residues and affect the graphene quality. Moreover, metal catalysts can be re-used several times for graphene growth and etching is not required for the graphene transferring procedure. In this work, we will present graphene growth on Pt and Cu foil using CVD method and introduced different alkaline salts suitable for peeling off graphene from metallic substrates using electrolysis process. Sodium hydroxide (NaOH), Potassium hydroxide (KOH), Lithium hydroxide (LiOH) and Barium hydroxide Ba(OH)2 alkaline solutions were electrolyzed. Then, hydrogen bubbles attached to the metal (Cu, Pt) cathode (graphene/Pt/PMMA stack) and as a result of that graphene layer peeled off from the substrate without any damage. It is observed that KOH and LiOH peeled off graphene very efficiently as compared to NaOH and Ba(OH)2. Furthermore, different characterizations techniques like optical microscopy, Raman spectroscopy, scanning electron microscopy (SEM) and atomic force microscopy (AFM) were performed to analyze transferred graphene. A detailed analysis has been made for the single layer and multilayer graphene domains.
MRS Spring Meeting (6-10 Nisan 2015)

Suggestions

Chemical Vapour Deposition of Graphene with Re useable Pt and Cu substrates for Flexible Electronics
Karamat, Shumaıla; Sonusen, Selda; Çelik, Ümit; Uysallı, Yiğit; Oral, Ahmet (null; 2015-03-06)
Graphene has gained the attention of scientific world due to its outstanding physical properties. The future demand of flexible electronics such as solar cells, light emitting diodes, photo-detectors and touch screen technology requires more exploration of graphene properties on flexible substrates. The most interesting application of graphene is in organic light emitting diodes (OLED) where efforts are in progress to replace brittle indium tin oxide (ITO) electrode with a flexible graphene electrode becaus...
Molecular dynamics investigation of Moire Patterns in double-layer graphene
Sökmen, Gökçe; Toffoli, Hande; Toffoli, Daniele; Department of Micro and Nanotechnology (2012)
Before Moire patterns are discovered in graphene, graphene was assumed to be found in only the rhombohedral form in nature. After transfer of graphene layer over another substrate was achieved by Andre Geim and Konstantin Novoselov, studies on graphene gained momentum. Following this, moire paterns were observed by scanning tunelling microscopy (STM) and high resolution transmision electron microscopy (HR-TEM). However, stability of these structures are still unknown. In this thesis, for the first time in l...
Production of boron nitride nanotubes from the reaction of NH₃ with boron and iron powder mixture
Noyan, Selin; Sezgi, Naime Aslı; Department of Chemical Engineering (2012)
Boron nitride nanotubes (BNNTs), which are structurally similar to carbon nanotubes (CNTs), were synthesized in 1995 for the first time. They are made up by folding atom sheets which consist of boron and nitrogen atoms into cylindrical form. After their discovery, BNNTs have been attracting great attention due to their extraordinary mechanical, thermal, electrical, and optical properties. In this study, BNNTs were synthesized from the reaction of ammonia gas with the boron and iron powder mixture in a tubul...
Synthesis and luminescence properties of tetraphenylethene-based small molecules used in organic light emitting diodes
Odabaş, Serhat; Tanyeli, Cihangir; Department of Chemistry (2014)
Organic light emitting diodes (OLED) is an exciting new technology that attracted much attention to scientist for emissive technology. The basic OLED structure consists of a stack of fluorescent organic layers sandwiched between a transparent conducting anode and metallic cathode. The important problems in luminescence is that, molecules aggregate in solid state that leads formation of excimers which results in emission quenching so that most of the luminescent materials show weak emissions in their solid f...
Fabrication and characterization of PEDOT:PSS hole transport layers for silicon solar cells
Türkay, Deniz; Yerci, Selçuk; Department of Micro and Nanotechnology (2019)
Heterojunction silicon solar cells have gained considerable interest in recent years with the demonstration of record-high device performances. However, these devices are typically based on inorganic layers fabricated at high temperatures under vacuum environment, using toxic precursors. The low temperature budget, non-toxic chemical contents, and wide range of adjustability in physical and electrical properties make poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) a promising candidate a...
Citation Formats
S. Karamat, S. Sonusen, Ü. Çelik, Y. Uysallı, and A. Oral, “Peeling of Chemical Vapour Deposition Graphene Grown on Platinum and Copper foils using Alkaline Solutions for Reuseable Substrates,” presented at the MRS Spring Meeting (6-10 Nisan 2015), San Francisco, ABD, 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/86060.