Ferhan Oktobriadi Putra Abdul Rahim, Singapore finalist
Ferhan is in the second year of his PhD in Bioengineering at Nanyang Technological University in Singapore, having received his BEng in Chemical and Biomolecular Engineering from the same institution in 2009. His research has focused on biosensors, biodevices, bioelectronics and bioMEMs at the Institute of Microelectronics and the Institute of Bioengineering and Biotechnology at A*STAR, Singapore. He has also studied natural substitutes for hydroquinone (which was recently banned for skin whitening purposes), and aspects of the feasibility of human hibernation and preservation for future space travel.
Tunable Surfacial Assembly of Gold Nanorods on Glass for Biosensor Applications
Gold nanoparticles have recently attracted much attention due to their shape- and size-dependent properties originating from localised surface plasmon resonance. Gold nanorods (GNRs) are especially attractive for biosensor applications owing to a tunable aspect ratio and relatively high sensitivity.
To develop a convenient and reliable diagnostic device, it is desirable to assemble nanorods on surfaces of appropriate substrates. I have adopted a full-immersion method for convenient coating of large areas of substrates in a predictable and uniformed fashion. The co-influence of ionic strength and surfactant concentration on the assembly based on the full-immersion method were studied. I proposed an extended mechanism which reveals the existence of a two-tiered shielding effect in nanorod solution at slightly higher surfactant concentrations. By varying the ionic strength at three fixed surfactant concentrations of the GNR solution, I achieved GNR assemblies of tunable densities on fully-immersed glass.