University of Limerick Institutional Repository


It is quite well-known that, deposition of highly-ordered layers of colloidal nanocrystals (mostly semiconductor and metal) onto different types of substrates is a really important aspect for various types of device fabrication and for other applications in many diverse areas. There are various different methods for forming these thin films/coatings of nanocrystals onto different substrates. But, among them, electrophoretic deposition (EPD) technique has attracted a lot of attention in the recent years due to its simplicity, high level of efficiency and cost-effectiveness. In this study, highly-ordered, close-packed, verticallyaligned, multi-layered assemblies of semiconductor nanorods (mainly CdSe) were deposited  successfully by EPD process onto different types of substrates. Also, multi-layered, vertically- aligned, close-packed assemblies of two different types of semiconductor nanorods (CdSe and CdSeS) on the same substrate were obtained by EPD process. Apart from that,  EPD of gold nanorods were also performed and good vertical alignment was obtained as well.

Different parameters related to the EPD process have been studied in this work, which will help us in understanding the process of EPD in depth for various useful applications and device fabrication

Electrophoretic Deposition (EPD)

 … The EPD experimental set-up used in this work consists of the following basic parts: a high-voltage generator, a programmable dip-coater apparatus, a substrate holder and a vial/container containing the colloidal solution of the concerned nanoparticles. The dip-coater apparatus (manufactured by Nadetech Innovations) can be programmed by using a suitable software, using a simple computer.


Experimental Details (EPD OF CdSe  nanorods)

The electrophoretic deposition (EPD) experimental set-up used in this work, is already described in details in section 2.3 of chapter 2 of this thesis.



A programmable dip-coater setup (manufactured by Nadetech Innovations), high-voltage power supply (TECHNIX SR-5-F300, S/N: BU08/04971) and a digital multimeter was used for effectively carrying out EPD.