Spontaneous emergence of optically polarizing nanoscale structures by co-deposition of aluminum with refractory metals: implications for high-temperature polarizers

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dc.contributor.authorTai, MCen_AU
dc.contributor.authorArnold, MDen_AU
dc.contributor.authorEstherby, Cen_AU
dc.contributor.authorde Silva, KSBen_AU
dc.contributor.authorGentle, ARen_AU
dc.contributor.authorCortie, DLen_AU
dc.contributor.authorMitchell, DRGen_AU
dc.contributor.authorWesterhausen, MTen_AU
dc.contributor.authorCortie, MBen_AU
dc.date.accessioned2024-02-27T01:01:05Zen_AU
dc.date.available2024-02-27T01:01:05Zen_AU
dc.date.issued2022-03-25en_AU
dc.description.abstractThe unexpected growth of highly aligned and optically polarizing metallic fins during physical vapor deposition under modestly oblique conditions is investigated. The fins exhibit nanoscale dimensions and are formed when Al is co-sputtered with any of V, Cr, Nb, Mo, Ta, W, Ru, Fe, Ni, Pt, Zr, Mg, and Ti. It is proposed that the phenomenon is caused by anomalously low atomic mobility in the alloys and intermetallic compounds formed by co-depositing with Al. In contrast, when Cu, Ag, and Au (which diffuse more rapidly in Al) are deposited, no fins form. There is a sharp visible transition in optical properties as the ratio of Al to other element is decreased: the color of the sample changes from black to silver-white for compositions containing less than about 55 atom % Al. The region over which the color change occurs is associated with a very strongly polarized reflectance. Cross-sectional elemental mapping and Monte Carlo simulations suggest that growth of the fins may be nucleated by Al hillocks and enhanced by shadowing effects. The diversity of suitable metals makes this a versatile technique for producing nanoscale polarizing surfaces suitable for high-flux and high-temperature applications. © American Chemical Societyen_AU
dc.description.sponsorshipThis research was supported by Australian Government Research Training Program Scholarships and by an Australian Research Council Discovery Project Grant DP140102003. The authors thank Dr Annette Dowd for helpful advice regarding STEM and Dr Mitchell Nancarrow (UoW EMC) for the preparation of the FIB lamellae. This research used the following tools funded by the Australian Research Council (ARC): FEI NanoLab G3 CX (LIEF grant LE160100063) and JEOL ARM200F (LIEF grant LE120100104), both located at UoW EMC.en_AU
dc.identifier.citationTai, M. C., Arnold, M. D., Estherby, C., de Silva, K. S. B., Gentle, A. R., Cortie, D. L., Mitchell, D. R. G., Westerhausen, M. T., & Cortie, M. B. (2022). Spontaneous emergence of optically polarizing nanoscale structures by co-deposition of aluminum with refractory metals: implications for high-temperature polarizers. ACS Applied Nano Materials, 5(3), 4316-4324. doi:10.1021/acsanm.2c00262en_AU
dc.identifier.issn2574-0970en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleACS Applied Nano Materialsen_AU
dc.identifier.pagination4316-4324en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/acsanm.2c00262en_AU
dc.identifier.urihttps://doi.org/10.1021/acsanm.2c00262en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15441en_AU
dc.identifier.volume5en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectAluminiumen_AU
dc.subjectNanostructuresen_AU
dc.subjectRefractory metalsen_AU
dc.subjectPolarizationen_AU
dc.subjectVaporsen_AU
dc.subjectIntermetallic compoundsen_AU
dc.subjectMonte Carlo Methoden_AU
dc.subjectFinsen_AU
dc.subjectMetalsen_AU
dc.titleSpontaneous emergence of optically polarizing nanoscale structures by co-deposition of aluminum with refractory metals: implications for high-temperature polarizersen_AU
dc.typeJournal Articleen_AU
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