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You searched for subject:(nanosoldering). Showing records 1 – 2 of 2 total matches.

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University of Illinois – Urbana-Champaign

1. Do, Jae Won. Selective metallization and electronic self-healing for high performance carbon-based nanoelectronics.

Degree: PhD, Electrical & Computer Engr, 2015, University of Illinois – Urbana-Champaign

Carbon-based nanomaterials have great potential to be used in future nanoelectronics due to their unique combinations of electrical, thermal, and mechanical properties. Specifically, carbon nanotubes (CNTs) and graphene have attracted great interest over the past decade in both the scientific and industrial communities for a variety of applications including high-performance thin-film transistors (TFTs) and conductive electrodes on transparent and flexible substrates, heat spreaders, and high-strength applications utilizing CNT macrostructures, such as CNT yarns and sheets. However, presently realized applications usually suffer from the high junction resistances between individual CNTs and graphene grains, which cause the performance and reliability of such applications to be significantly lower than those of individual CNTs and graphene. In this dissertation work, we study novel techniques that take advantage of such high resistances in order to enable selective metallization and self-healing in CNT and graphene based devices. First, we investigate a method to reduce the high CNT junction resistance through a nanoscale chemical vapor deposition (CVD) process. We show that by passing current through the CNT devices in the presence of CVD precursor, localized Joule heating induced at the CNT junctions stimulates selective and self-limiting deposition of metallic nanosolder. We also show that the effectiveness of this nanosoldering process depends on the work function of the deposited metal, which can improve the on/off current ratio of CNT devices by nearly an order of magnitude when the right metal (Pd) is chosen. Then, we introduce a different route to carry out the nanosoldering process by applying the metal precursor using a solution-mediated technique. The new process not only facilitates the selective metallization of Pd nanoparticles at the CNT junctions to improve the device performance, but it also enables a multitude of different precursors to be used to deposit a variety of materials. With the enhanced solution-mediated application technique, we then study the versatility of our nanosoldering process by applying it to graphene devices. We show that the grain boundaries (GBs) formed between individual grains act similarly to CNT junctions by heating up during device operation. We also show that the local temperature increases at the GBs trigger the thermal decomposition of metal precursor to deposit Pd selectively at the GBs, which can result in improvement in the overall resistance of the graphene device as well as redistribution of the temperature. Lastly, the nanosoldering process is investigated with an organic-based precursor to bring about further improvement in the CNT devices. The organic-based precursor composed of halogenated aromatic hydrocarbons can undergo dehalogenation and dehydrogenation processes upon heat treatment, resulting in two-dimensional covalent networks of carbon atoms. Our results from combining our nanosoldering technique with the organic-based precursor show… Advisors/Committee Members: Lyding, Joseph W. (advisor), Lyding, Joseph W. (Committee Chair), Rogers, John A. (committee member), Girolami, Gregory S. (committee member), Li, Xiuling (committee member).

Subjects/Keywords: Carbon Nanotube (CNT); graphene; nanosoldering; intertube junction; electrical resistance; thermal resistance; solution deposition; covalent bonding; local chemical vapor deposition (CVD)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Do, J. W. (2015). Selective metallization and electronic self-healing for high performance carbon-based nanoelectronics. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78758

Chicago Manual of Style (16th Edition):

Do, Jae Won. “Selective metallization and electronic self-healing for high performance carbon-based nanoelectronics.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed August 20, 2019. http://hdl.handle.net/2142/78758.

MLA Handbook (7th Edition):

Do, Jae Won. “Selective metallization and electronic self-healing for high performance carbon-based nanoelectronics.” 2015. Web. 20 Aug 2019.

Vancouver:

Do JW. Selective metallization and electronic self-healing for high performance carbon-based nanoelectronics. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2019 Aug 20]. Available from: http://hdl.handle.net/2142/78758.

Council of Science Editors:

Do JW. Selective metallization and electronic self-healing for high performance carbon-based nanoelectronics. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78758

2. Do, Jae Won. Electrostatic transfer of graphene grown on copper foil and nanosoldering of carbon nanotube junctions.

Degree: MS, 1200, 2012, University of Illinois – Urbana-Champaign

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. Advisors/Committee Members: Lyding, Joseph W. (advisor).

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

…Chapter 3 will detail the experimental technique for nanosoldering the CNT junctions along with… …electrostatic transfer of graphene on copper foils and nanosoldering of CNT junctions. It will also… …conformality. Scale bars are 10 ┬Ám unless otherwise stated. 25 CHAPTER 3 NANOSOLDERING CARBON… …locally deposit metals via chemical vapor deposition (CVD), thereby nanosoldering the… …thus stopping the nanosoldering process. Then, the next-resistive junctions will undergo… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Do, J. W. (2012). Electrostatic transfer of graphene grown on copper foil and nanosoldering of carbon nanotube junctions. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/29553

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Do, Jae Won. “Electrostatic transfer of graphene grown on copper foil and nanosoldering of carbon nanotube junctions.” 2012. Thesis, University of Illinois – Urbana-Champaign. Accessed August 20, 2019. http://hdl.handle.net/2142/29553.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Do, Jae Won. “Electrostatic transfer of graphene grown on copper foil and nanosoldering of carbon nanotube junctions.” 2012. Web. 20 Aug 2019.

Vancouver:

Do JW. Electrostatic transfer of graphene grown on copper foil and nanosoldering of carbon nanotube junctions. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2012. [cited 2019 Aug 20]. Available from: http://hdl.handle.net/2142/29553.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Do JW. Electrostatic transfer of graphene grown on copper foil and nanosoldering of carbon nanotube junctions. [Thesis]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/29553

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.