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Aluminum Nanocrystals Form Voids under Their Native Oxide

https://doi.org/10.1021/acs.nanolett.5c02981

Jacobson, Christian R; Ahmad, Aliyu; Tao, Ang; Qi, Xu; Bayles, Aaron; Ogundare, Adebola; Han, Yimo; Everitt, Henry O; Halas, Naomi J (August 2025, Nano Letters)

Free, publicly-accessible full text available August 6, 2026
Reduced-Dimensionality Al Nanocrystals: Nanowires, Nanobars, and Nanomoustaches

https://doi.org/10.1021/acs.nanolett.4c00895

Solti, David; Jacobson, Christian R; Yates, J_Alexander Orion; Hammel, Benjamin Franklin; Naidu, Gopal Narmada; Arndt, Catherine E; Bayles, Aaron; Yuan, Yigao; Dhindsa, Parmeet; Luu, Jessica T; et al (June 2024, Nano Letters)

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Tailoring the aluminum nanocrystal surface oxide for all-aluminum-based antenna-reactor plasmonic photocatalysts

https://doi.org/10.1073/pnas.2321852121

Bayles, Aaron; Fabiano, Catherine J.; Shi, Chuqiao; Yuan, Lin; Yuan, Yigao; Craft, Nolan; Jacobson, Christian R.; Dhindsa, Parmeet; Ogundare, Adebola; Mendez Camacho, Yelsin; et al (March 2024, Proceedings of the National Academy of Sciences)

Aluminum nanocrystals (AlNCs) are of increasing interest as sustainable, earth-abundant nanoparticles for visible wavelength plasmonics and as versatile nanoantennas for energy-efficient plasmonic photocatalysis. Here, we show that annealing AlNCs under various gases and thermal conditions induces substantial, systematic changes in their surface oxide, modifying crystalline phase, surface morphology, density, and defect type and concentration. Tailoring the surface oxide properties enables AlNCs to function as all-aluminum-based antenna-reactor plasmonic photocatalysts, with the modified surface oxides providing varying reactivities and selectivities for several chemical reactions.
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Observing Metallic Carriers in Highly Faceted Plasmonic Cd ₂ SnO ₄ Inverse Spinel Nanocrystals

https://doi.org/10.1002/adom.202400388

Ortega, Raul_E; Smith, Robert_B; Kuszynski, Jason_E; Bayles, Aaron; McGill, Stephen_A; Halas, Naomi_J; Schurko, Robert_W; Strouse, Geoffrey_F (June 2024, Advanced Optical Materials)

Abstract Correlating data from optical, structural, and theoretical methods allows the properties of highly faceted Cd₂SnO₄(CTO) inverted spinel plasmonic semiconductor nanocrystals (PSNCs) to be fully evaluated. The use of Sn(II) in the colloidal reaction for CTO results in reproducible octahedral PSNCs with an aspect ratio of 1.30. Correlating extinction spectra with magnetic circular dichroism yields a carrier density (n = 5.19 × 10¹⁹cm⁻³) and carrier effective mass (m* = 0.022m_e) respectively.¹¹³Cd and¹¹⁹Sn solid‐state NMR experiments show clear evidence of metallic‐like carriers in CTO NCs based upon the observation of Knight shifts. These data suggest that carrier formation in CTO arises from Sn antisite occupation of octahedral Cd sites (Sn_Cd)_.From a broader perspective, the results point to wide‐bandgap spinels as being an important but understudied class of plasmonic PSNCs.
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