Observation of tunable surface plasmon resonances and surface enhanced infrared absorption (SEIRA) based on indium tin oxide (ITO) nanoparticle substrates

Recent advances in nanostructured substrates for surface-enhanced infrared absorption spectroscopy

“…Different to the other preparation approaches, organometallic compounds are selected as the starting material in the thermal decomposition method. Nanoparticles are obtained after decomposition, nucleation, and the growth process of organometallic compounds [129,[200][201][202]. The thermal decomposition method has an edge in synthesizing nanostructured materials with uniform size and narrow particles distribution (figure 5(c)).…”

“…The thermal decomposition method has an edge in synthesizing nanostructured materials with uniform size and narrow particles distribution (figure 5(c)). Sndoped In 2 O 3 spherical nanomaterials were prepared using the thermal decomposition method and served as a SEIRA-active substrate [129]. It is worth noting that the growth of ITO nanoparticles was affected by kinetics and thermodynamics.…”

“…Different to metal nanomaterials, the charge carrier density of metallic oxide nanomaterials can be regulated by chemical doping, post-synthesis chemical, and electrochemical reactions to modulate the density of charge carriers in the preparation process, hence the absorption range and coefficient of the LSPR band will be affected [126][127][128], and will finally change the properties of the SEIRA. For example, Ma et al found that indium tin oxide (ITO) nanocrystals could be used as a novel and economic SEIRA-active substrate [129] (figure 3(a)). It was shown that ITO nanocrystals with a 5% Sn atomic doping ratio exhibited the highest SEIRA effect with a low detection limit (10 −5 mol L −1 ) of probe 1,1′dicarboxyferrocene (figure 3(b)).…”

“…Da Silva et al successfully prepared colloidal Cu 2−X Se nanomaterials using mercaptosuccinic acid (MSA) as the stabilizing agent [135]. By adjusting the Cu/Se Reproduced from [129] with permission from Elsevier, copyright 2022. (c) LSPR mode of a single FITO nanocube extracted from spectrum images acquired by scanning transmission electron microscopy-electron energy loss spectroscopy [130].…”

Mechanically Induced Anisotropic Fragments in Sn-Doped In2O3 Nanoparticle Films for Flexible Strain Sensing Based on Surface Plasmons

“…In this study, we investigated the strain sensing performance and working mechanism of an assembled thin film consisting of Sn-doped In 2 O 3 NPs (ITO NP film) for fabricating plasmonic strain sensors. ITO NP films function as plasmonic metamaterials in the infrared (IR) range and are strongly affected by structural and chemical control of interparticle gaps. , Therefore, ITO NP films have piqued interest in various IR-related applications, such as energy, thermal, and biological fields. − Furthermore, the SPR behavior of ITO NP films has been dynamically tuned in different external fields. The electrochemical fields on ITO NP surfaces exhibit reversible SPR responses in IR range, , resulting in the development of smart window applications.…”