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Deposition and Characterization of Graphene from Solid Carbon Sources

Synthesis of graphene layers by reliable physical vapor deposition techniques (Park et al. [48]) could expand the technology areas in which it is currently applied and open new paths and possibilities in device concepts and design.
Among the direct benefits of Physical Vapour Deposition (PVD) versus cheaper and more productive chemical or mechanical methods, particularly crucial to conform established technologies are:
1. Control and reproducibility of layers’ features and properties;
2. Use of semiconducting or insulating substrates;
3. Compatibility with patterned architectures;
4. Clean and controllable growth environment;
5. Avoid of transfer and fixing processes;
6. Use of in-situ characterization techniques.
Prompted by the work of Lippert et al. [30], we have set up an Ultra-High Vacuum (UHV) evaporation chamber dedicated to the growth of graphene layers in which we have installed two different carbon sources, namely direct heating C-filament cell and Tubo-e® (Createc GmbH), so as to compare their usage, operational parameters and layer properties.
Graphene-like layers on mica substrates have been successfully obtained from solid carbon filament source under UHV conditions, achieving uniform layer deposition over extended macroscopic areas. Layers are composed of graphene nanocrystals homogeneously distributed, as measured by μ-Raman spectroscopy and atomic force microscopy. Ohmic I/V characteristic curves have been obtained by conductive probe AFM.

Mostra/Nascondi contenuto.
Adolfo De Sanctis: Deposition and characterization of Graphene from solid carbon sources. università degli studi dell’aquila facoltà di scienze matematiche, fisiche e naturali corso di laurea in fisica - classe l-30 elaborato - prova finale supervisors: Dr. Luca Ottaviano 1 Dra. Mar García Hernández 2 coordinators: Dra. Ana Ruiz 2 Dr. Federico Mompeán 2 location: 1. Università degli Studi dell’Aquila 2. ICMM - CSIC, Madrid, Spain time frame: Anno Accademico2010/2011 version: 1.0 - March24,2012 at17:19 This work was typeset with L A T E X2 using Hermann Zapf’s Palatino and Euler type faces. The listings are typeset in Bera Mono, originally developed by Bitstream, Inc. as “Bitstream Vera”. The typographic style was inspired by bringhurst’s genius as presented in the elements of typo- graphic style. It is available for L A T E X via CTAN as “classicthesis”. L Y X port by nick mariette and ivo pletikosi. Assembled and compiled with L Y X 2.0.1 under Ubuntu Linux 10.04 LTS “Lucid Lynx”. All pictures and graphics, unless explicitly stated, have been made by the Author from original photographs, modified and elaborated us- ing GIMP image processing software under Ubuntu Linux OS. All Data plots have been made using GNUplot software suite.

Laurea liv.I

Facoltà: Scienze Matematiche, Fisiche e Naturali

Autore: Adolfo De Sanctis Contatta »

Composta da 78 pagine.


Questa tesi ha raggiunto 270 click dal 23/04/2012.

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