Ligand Tuning of Localized Surface Plasmon Resonances in Antimony-Doped Tin Oxide Nanocrystals

Abstract

Aliovalent-doped metal oxide nanocrystals exhibiting localized surface plasmons (LSPRs) are applied in systems that require reflection/scattering/absorption in infrared and optical transparency in visible. Indium tin oxide (ITO) is currently leading the field, but indium resources are known to be very restricted. Antimony-doped tin oxide (ATO) is a cheap candidate to substitute the ITO, but it exhibits less advantageous electronic properties and limited control of the LSPRs. To date, LSPR tuning in ATO NCs has been achieved electrochemically and by aliovalent doping, with a significant decrease in doping efficiency with an increasing doping level. Here, we synthesize plasmonic ATO nanocrystals (NCs) via a solvothermal route and demonstrate ligand exchange to tune the LSPR energies. Attachment of ligands acting as Lewis acids and bases results in LSPR peak shifts with a doping efficiency overcoming those by aliovalent doping. Thus, this strategy is of potential interest for plasmon implementations, which are of potential interest for infrared upconversion, smart glazing, heat absorbers, or thermal barriers.

Dipolar Ligands Tune Plasmonic Properties of Tin-Doped Indium Oxide Nanocrystals

“…Considering the two known mechanisms that can explain how a molecular layer influences band bending, our data suggest that the static field mechanism based on electrostatics is dominant in this case. In future studies, direct observations of the surface state energies, e.g., with energy-resolved electrochemical impedance spectroscopy, , and direct analysis of the band bending, e.g., with angle-resolved photoemission spectroscopy, may be used to further analyze the influence of dipolar ligands, ligands with different binding groups, , and other surface chemical modifications. Furthermore, the influence of dipolar ligands on plasmonic properties of other semiconductor NCs, such as doped ZnO, , CdO, and p-type copper chalcogenide NCs, each having distinct electronic structure and band bending characteristics, would broaden understanding of the properties and phenomena we observed here for ITO NCs …”

Solar Interfacial Evaporation at the Water–Energy Nexus: Bottlenecks, Approaches, and Opportunities

“…When the incident solar frequency is consistent with the materials oscillation frequency, can produce hot electron excitation, and then with the incident field have a resonance effect, heat generated subsequently. [74][75][76][77] Zhu et al [78] studied and designed a new type of plasma material, which was made by evenly adding fine metal nanoparticles Pb, Au, and Ag into a 3D mesoporous matrix of natural wood. The designed evaporation device exhibited high solar radiation absorption capacity (about 99%) over a wide wavelength range of 200-2500 nm while transporting water from the bottom up efficiently.…”

Femtosecond Autocorrelation of Localized Surface Plasmons

“…The blue curves are the simulation results with AuNPs involved in autocorrelation processes. The plasmonic dephasing lifetime was justified by fitting the measured autocorrelation data using our model in (1)(2)(3)(4)(5)(6). In Figure 5a, the upper glass plate was coated with AuNPs for the rotator, corresponding to scheme .…”

“…Localized surface plasmons (LSPs) are essentially understood as collective oscillations of free electrons in nanostructured metals [1][2][3] and other conductive materials [4][5][6], which have been extensively investigated and applied in optoelectronic devices [7][8][9][10][11][12] and sensors [13][14][15][16]. Local-field and light-scattering enhancement by LSPs have been utilized in photovoltaic diodes [7,8], light-emitting devices [9,10], and various type of lasers [11,12].…”