Open Access2-D Study of Near-field Generated by Surface Plasmon Resonance of Short Axis of Gold Nano-rods on SiO2 and CeO2/SiO2 Substrates for Optimisation of Water Splitting Reaction
Author(s) -
Muhammad Nur Syafi’ie Md Idris,
HaiPang Chiang,
Yuan-Fong Chou Chau,
Abdul Hanif Mahadi,
Chee Ming Lim
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1127/1/012005
Subject(s) - surface plasmon resonance , materials science , plasmon , refractive index , surface plasmon , localized surface plasmon , resonance (particle physics) , substrate (aquarium) , electric field , analytical chemistry (journal) , optoelectronics , optics , nanoparticle , nanotechnology , chemistry , atomic physics , oceanography , physics , chromatography , geology , quantum mechanics
Distinguishing near-field intensity distribution and plasmon resonance peak wavelength of surface plasmon resonance of gold nano-rods (AuNRs) can provide information for the optimisation of localised surface plasmon and gap plasmon resonances of gold nano-rods. This work, shows the influence of how refractive indexes of the surrounding medium and adjacent surface, as well as, AuNRs pair inter-particle gap contributes to the generation of surface plasmon resonances. The simulation model presented consists of AuNRs pair situated on silicon dioxide (SiO 2 ) and cerium dioxide/silicon dioxide (CeO 2 /SiO 2 ) substrates with air and water as the surrounding media. The results show high near-field intensities at AuNRs/CeO 2 interfaces with CeO 2 refractive index (n = 2.38), and the near-field intensities contributed by the gap resonance is minimal between the AuNRs of inter-particle gap of 10 nm, however, the near-field intensities become significant near to the AuNRs/CeO 2 interfaces because of reduced near-field interference. The simulation set-up provides the conditions for water splitting in thermochemical redox reaction of CeO 2 /CeO 2-x resulting in the production of hydrogen. AuNRs pair with inter-particle gap of 5 nm situated on 10 nm thick CeO 2 of CeO 2 /SiO 2 substrate shows the most favorable conditions for water splitting.