The quality factor enhancement on gold nanoparticles film for localized surface plasmonic resonance chip sensor

Gold nanoparticles film as a part of an optical sensor is considered as active support in the development of specific chemical or biological biosensors optically. Well-organized gold nanoparticles can be prepared through inexpensive approaches where gold nanoparticles are easily obtained on a glass substrate. Herein, the authors propose a low-cost thermal synthesis of active plasmonic nanostructures on thin gold layers modified by a short annealing time (1 min and 15 min) at 550 °C and quickly followed by simple quenching. The results proved a good reproducibility of localized surface plasmon resonance (LSPR) optical responses with investigate the effects of modified thermal treatment on the morphology of gold thin films, the extinction LSPR spectra characteristics in the range between 350−1000 nm, and the quality factor (Q-factor) of the plasmonic resonance. The present findings that the proposed method gives evidence enhancement with the enrichment factor (EF-factor) values by about 310 %–460 %. We believe our study may have provided a strategy to enhance the fabrication of gold nanoparticles film based on plasmonic nanostructures for LSPR chip sensor applications.