3D Particle Assembly in Micro-Scale by Using Electrophoretic Micro-Fabrication Technique

Abstract:

A novel micro-fabrication technique for particle assembly has been performed by an electrophoretic deposition (EPD) method using a local electric field in a colloidal suspension generated by a microelectrode. This unique EPD technique was called a “μ-EPD process”. Monodispersed polystyrene microspheres with diameters of 204, 290, and 320 nm were used in this study. A 50 μm Pt wire embedded into a polytetrafluoroethylene tube and an ITO glass slide were employed as the micro-counter electrode and the substrate, respectively. A slow deposition rate in the μ-EPD process was preferable to form a high quality micro-deposit consisting of a three-dimensional periodic polystyrene array. Under the optimized μ-EPD conditions, three-dimensionally ordered polystyrene particles were deposited in front of the micro-counter electrode. This micro-deposit constructed from polystyrene particles with a close-packed structure showed a characteristic optical absorption peak due to Bragg’s law.

• Periodical: Key Engineering Materials (Volume 314)
• Pages: 7-12
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.314.7
• Online since: July 2006
• Authors: Jun Ichi Hamagami, Kazuhiro Hasegawa, Kiyoshi Kanamura
• Keywords: Colloidal Photonic Crystal, Micro-Electrophoretic Deposition Process, Monodispersed Polystyrene Microsphere, Optical Property, Particle Assembly

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