Title

Nanoparticle Manipulation with a Laser-Induced Surface Bubble and Its Application

Author

Yuwen Li

Date of Award

1-1-2019

Degree Name

M.S. in Electro-Optics

Department

Department of Electro-Optics

Advisor/Chair

Advisor: Chenglong Zhao

Abstract

In this study, we demonstrated nanoparticle manipulation and its application in advanced nanofabrication and chemical sensing by using a laser-induced surface bubble. A laser-induced surface bubble refers to a bubble that is generated on a liquid-solid interface by using a laser. The laser-induced surface bubble is generated on a gold-coated glass substrate by focusing a continuous-wave (CW) laser on a solid-liquid interface. The laser heats up the solid surface and generates a surface bubble on the solid-liquid interface. We call it a surface bubble because the bubble stick on the surface and is easy to manipulate. Once a surface bubble is generated on the solid-liquid interface, a strong convective flow is induced in the liquid, which can be used to fabricate ring-shaped disk structures for chemical sensing. The size and position of the surface bubble can be dynamically adjusted by changing the power and position of the laser spot. Nanoparticles of different sizes and materials are fabricated on a glass substrate by using the surface bubble. We studied this surface-bubble based fabrication process by investigating different fabrication parameters, such as laser power, laser exposure time, and laser chopping frequency. The possibility of multiple-layer nanofabrication is also investigated by fabricating gold and silver nanoparticles in a layer-upon-layer manner. The final fabricated ring-shaped nanostructure is used as a chemical sensor for the detection of Rhodamine 6G. The nanoparticle manipulation method based on the laser-induced surface bubble enables the possibility of advanced nanofabrication and chemical sensing.

Keywords

Optics, Electrical Engineering, Laser-induced surface bubble, nanofabrication, chemical sensing

Rights Statement

Copyright 2019, author

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