Hui Wang

Graduation Semester and Year

2011

Language

English

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Aerospace Engineering

Department

Mechanical and Aerospace Engineering

First Advisor

Cheng Luo

Abstract

Conventional lithographic approaches are good at fabricating structures on the top surfaces of substrates. They are not suited for 3D surface patterning due to the fact that vertical radiation exposure is employed to transfer patterns. In the meanwhile, patterns generated on 3D surfaces, such as the vertical sidewalls of silicon channels and the irregular surfaces of glass micropipettes may provide valuable applications in microfluidics, 3D circuits, bioengineering and so on. In this work, we developed new approaches to produce metal micropatterns on the vertical sidewalls of silicon channels as well as to fabricate two separated metal microlines on the tips of glass micropipettes. Using these approaches 10 µm Au dots and 20-µm-wide Au lines have been successfully produced on the sidewalls and two separated microlines have been fabricated on the outer surface of a glass micropipette with tip size down to 5 µm. In the meantime, it was found in our experiments that ZnO nanowires may contact each other and become linked during hydrothermal growth. This phenomenon might be useful for building novel nanostructures. Accordingly, we monitored the process of nanowires growth and explained the formation of two types of linked nanowires.

Disciplines

Aerospace Engineering | Engineering | Mechanical Engineering

Comments

Degree granted by The University of Texas at Arlington

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