Bhavin Parekh

Abstract

Three surface modification techniques: (1) atmospheric oxygen pressure using low-pressure Hg lamps, (2) low oxygen pressure with emission downstream from an Ar microwave plasma, and (3) high pressures of He in a rotating D.C. arc, that was designed to produce a spectral continuum from He excimers ( λ = 58 - 110 nm), were employed to photo-oxidize multiwalled carbon nanotube (MWNT) powder [1], single walled carbon nanotube (SWNT) paper [2], Teflon® polyfluorinated ethylene-propylene (FEP) [3] and Teflon® poly(tetrafluoroethylene-co-perfluropropyl vinyl ether) (PFA) [4]. Results from X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, FT-IR, Scanning Electron Microscopy (SEM) and Contact angle measurements of the oxidized surfaces are presented. Copper, that was sputter-coated onto the modified FEP and PFA, showed adhesion failure occurring within the modified materials (cohesive failure) and not at the Cu-FEP and -PFA interfaces.

[1] B. Parekh, T. Debies, P. Knight, K. S. V. Santhanam and G. A. Takacs, "Photo-oxidation of Multi walled Carbon Nanotubes", six page manuscript accepted for publication in: Proceedings of Fall 2005 National Meeting of the Materials Research Society; Symposium Q Degradation Processes in Nanostructured Materials, Boston MA (2006).

[2] B. Parekh, T. Debies, C. M. Evans, B. J. Landi, R. P. Raffaelle and G. A. Takacs, "Photo-oxidation of Single walled Carbon Nanotubes", six page manuscript accepted for publication in: Proceedings of Fall 2005 National Meeting of the Materials Research Society; Symposium Q Degradation Processes in Nanostructured Materials, Boston MA (2006). 11

[3] B. Parekh, A. Entenberg, T. Debies, and G. A. Takacs, "Cohesive Failure of Sputtered Copper to Teflon^FEP Interface Modified with VUV Helium Excimer Radiation", presented at the Second International Symposium on Adhesion Aspects of Thin Films, Savannah, GA, Nov. 9-11, 2005.

[4] B. Parekh, A. Entenberg, T. Debies, and G. A. Takacs, "Interfacial Adhesion Improvement of Sputtered Cu to TeflonPFA Modified by VUV Helium Excimer Radiation", presented at the Rochester Section of American Chemical Society (ACS) in Rochester, NY, Sept. 29 - 30, 2005.

Library of Congress Subject Headings

Nanotubes; Fluoropolymers--Effect of radiation on; Carbon--Effect of radiation on; Far ultraviolet radiation; Ultraviolet radiation; Surface chemistry

Publication Date

2006

Document Type

Thesis

Student Type

Graduate

Degree Name

Materials Science and Engineering (MS)

Department, Program, or Center

Center for Materials Science and Engineering

Advisor

Gerald Takacs

Advisor/Committee Member

K.S.V. Santhanam

Comments

Physical copy available from RIT's Wallace Library at QC176.8.N35 P37 2006

Campus

RIT – Main Campus

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