Tunable plasmon resonance of molybdenum oxide nanoparticles synthesized in non-aqueous media

Abstract

Plasmonic compound nanoparticles (NPs) have attracted great interest because they are prepared at lower cost and show unique optical properties. However, full replacement of the plasmonic noble metal NPs with the compound NPs has been difficult because most of the compound NPs exhibit plasmon resonance in the infrared range owing to low free carrier density and mobility. In order to overcome this limitation, we developed a new synthetic method for plasmonic MoO and MoO NPs. Those NPs exhibit plasmon resonance at ∼500 nm and 600-1000 nm, respectively, likely because of high carrier densities. The plasmonic properties of the NPs are tunable by changing the synthetic conditions or oxidizing and reducing the NPs. Their refractive index sensitivities are 115-260 nm RIU. Those molybdenum oxide NPs are expected to substitute for plasmonic noble metal NPs in optical, electronic, sensing and light harvesting devices and materials.

Stable and tunable plasmon resonance of molybdenum oxide nanosheets from the ultraviolet to the near-infrared region for ultrasensitive surface-enhanced Raman analysis

“…The red shift of the observed peak takes place when the solvent refractive index is increased, and a linear relationship between absorption peaks and solvent refractive index is achieved (Fig. 3b and S7†), testifying that this absorption peak is attributed to the LSPR 34…”

Unprecedented Surface Plasmon Modes in Monoclinic MoO2 Nanostructures

“…These features make MoO 2 a promising candidate for SPR‐related practical applications due to its strong and stable SPR effect. [ 32,33 ] Nevertheless, to the best of our knowledge, specific SPR modes possibly supported by the 2D MoO 2 ‐based nanostructures have not been studied before, neither their shape‐ nor their size‐dependence, let alone their spatial variability over the nanostructures.…”

Advances in Applications of Metal Oxide Nanomaterials as Imaging Contrast Agents

“…Recently, formation of MoO 2 nanocrystals with LSPR in 800–1000 nm was proposed and demonstrated for PTT . LSPR tuning of MoO 2 and MoO 3‐x in visible and NIR wavelengths was also demonstrated by controlling oxygenation of the nanoparticles …”