Qiu Guangyu, Hong Kong

Qiu Guangyu has an MSc (Hons) in Materials Engineering and Nanotechnology from the Department of Physics and Materials Science at City University of Hong Kong, continuing his PhD studies this September. Guangyu is currently focused on surface plasmon sensing devices fabricated by thermal annealing self-assembly methods. His research achieved the low-cost and high-sensitivity biosensing device, presented at international conferences. He believes his work and manufacture methods have a great potential in future commercial high-sensing applications.

Evanescently excited localized surface plasmon resonance biosensor based on self-assembly gold nanoislands

Bio-sensors are required to be sensitive and capable to detect small molecules. One method using light-electron interaction to achieve such detection is localized surface plasmon resonance (LSPR), incorporating a metal layer with nano-scale roughness. In this presentation, the development of a low cost, randomly distributed self-assembly gold nanoislands (SAM-AuNIs) ultrathin film is described. The size and nanoislands gaps between them were controlled via thermal annealing. Using this nanostructure as the sensing medium in the LSPR setup, extraordinary sensitivity has been achieved. Our trial demonstrates excellent detection limit for bio-molecules.

It is noted that the present SAM-AuNIs need less gold consumption than conventional SPR sensor on gold film and the fabrication procedure is quite straightforward. Thus we envision that these SAM-AuNIs LSPR bio-sensor with evanescently excitation will be a promising candidate for future bio-sensing applications.