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Title Electrostatic transfer of graphene grown on copper foil and nanosoldering of carbon nanotube junctions
Publication Date
Date Accessioned
Degree MS
Discipline/Department 1200
Degree Level thesis
University/Publisher University of Illinois – Urbana-Champaign
Abstract This thesis presents novel techniques to enhance the key processing and device issues related to carbon nanoelectronics. Particularly, the presented techniques involve transferring graphene grown on copper foil using electrostatic force and improving the junction resistance of carbon nanotube (CNT) networks by nanosoldering. Typically, transferring graphene grown on metal substrates involves wet etching steps in order to separate graphene from its metal growth substrates. During these wet etching steps, however, residues and wrinkles can be easily introduced in graphene and degrade its quality. By using electrostatic force instead, we attempt to transfer graphene grown on copper foil without involving the wet etching steps, thereby simplifying the transfer technique and improving the quality of transferred graphene. In addition, we further study the interaction between graphene and the copper substrate. For nanosoldering of CNT networks, we propose a novel method to locally deposit metals at the junctions of CNTs in order to lower the junction resistance. As these junctions are the most-resistive regions, we are able to locally heat the junctions by passing currents through the CNT network. In the presence of metal precursors in a vacuum environment, we attempt to deposit metals locally and selectively at these junctions. Our results show that the metals indeed start to form locally at the inter-tube junctions, which indicates that the junctions are the spots of high thermal resistance. The effects of nanosoldering these junctions seem to vary according to the types of metals deposited at the junctions, and are subjects for further study.
Subjects/Keywords graphene; graphene transfer; electrostatics; graphene growth; graphene on copper; carbon nanotubes; nanosoldering; carbon nanotube junctions; carbon nanotube junction resistance; local chemical vapor deposition
Contributors Lyding, Joseph W. (advisor)
Language en
Rights Copyright 2011 Jae Won Do
Country of Publication us
Record ID handle:2142/29553
Repository uiuc
Date Retrieved
Date Indexed 2018-11-19
Grantor University of Illinois at Urbana-Champaign
Issued Date 2012-02-01 00:55:07

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…practical applications. While the growth of graphene on metal substrates, in particular single-layer graphene on copper [20], suggests technological applications based on transferring the graphene onto different substrates, one critical challenge…

…discussed. 1.4 Thesis Structure Chapter 2 will detail the experimental technique for electrostatic transfer of graphene grown on copper foils along with the background information related to such a transfer technique. Optical microscope and scanning…

…currentvoltage characteristics for the carbon nanotube devices for characterization and analysis. Chapter 4 will summarize and discuss the results of electrostatic transfer of graphene on copper foils and nanosoldering of CNT junctions. It will also detail future…

…zoom-in and cross section of energy bands of a metallic (left) and a semiconducting (right) carbon nanotubes [11]. 11 CHAPTER 2 ELECTROSTATIC TRANSFER OF GRAPHENE GROWN ON COPPER FOIL 2.1 Background on Graphene Transfer…

…for graphenebased electronics. As mentioned earlier, graphene grown on metal substrates, in particular singlelayer graphene on copper, has generated much interest due to its low cost and its potential to produce large-area monolayer graphene [20…

…x5D;. A recent study indicates that a certain crystallographic orientation of copper produces pristine monolayer graphene with few defects [35], suggesting technological applications based on transferring the graphene grown on copper onto…

…attractive force. Such a transfer technique avoids the wet etching steps that can incorporate residues and introduce wrinkles in the graphene during the transfer. In this chapter, we further carry out this idea by transferring graphene grown on copper foils…

…by chemical vapor deposition (CVD) onto different substrates using electrostatic force. While the interaction between graphene and its copper growth substrate is not fully understood, Li et al., showed that the graphene growth mechanism on