Gold Bipyramids as a Promising Alternative to Gold Nanorods for Analytical and Biomedical Applications

[2605.20582] Gold Bipyramids as a Promising Alternative to Gold Nanorods for Analytical and Biomedical Applications Skip to main content Search Submit Donate Log in Physics > Optics arXiv:2605.20582 (physics) [Submitted on 20 May 2026 ( v1 ), last revised 25 Aug 2026 (this version, v2)] Title: Gold Bipyramids as a Promising Alternative to Gold Nanorods for Analytical and Biomedical Applications Authors: Andrey M. Burov , Sergey V. Zarkov , Arina V. Drozd , Igor V. Borisov , Elena G. Zavyalova , Nikolai G. Khlebtsov View PDF Abstract: Pentagonal gold bipyramids with dimensions of 75x25 nm and a longitudinal plasmon resonance (PR) at 753 nm are synthesized. For comparison, gold nanorods with a diameter of 20 nm, lengths ranging from 95 to 50 nm, and longitudinal PR from 945 to 644 nm were synthesized by chemical etching. The samples were characterized by UV-vis spectroscopy and transmission electron microscopy (TEM). It is shown that the absorption spectral quality factor of the bipyramids is significantly higher than that of the nanorods. To compare the nanoparticles as platforms for surface-enhanced Raman scattering (SERS), their surface was functionalized with thiolated nitrobenzene molecules (NBT). It is demonstrated that the SERS enhancement factor for the bipyramids is approximately three times higher than that for the nanorods. The red shift of the bipyramids' PR after functionalization with NBT molecules is also about three times greater than for nanorods with the same PR. This agrees with the theoretical estimate of the bipyramids' PR shift being more sensitive to variations in the refractive index of the external medium or the dielectric shell thickness than that of gold nanospheres and nanorods. The high efficiency of the bipyramids as thermosensitizers for converting laser radiation into heat in photothermal therapy is experimentally and theoretically demonstrated. Effective photothermal killing of E. coli was shown upon irradiation with a laser at the plasmon resonance wavelength using nanobipyramids or nanorods. Comments: 37 pages, 7 figures, 65 references Subjects: Optics (physics.optics) Cite as: arXiv:2605.20582 [physics.optics] (or arXiv:2605.20582v2 [physics.optics] for this version) https://doi.org/10.48550/arXiv.2605.20582 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Beilstein J. Nanotechnol. 2026, 17, 1170-1184 Related DOI : https://doi.org/10.3762/bjnano.17.80 Focus to learn more DOI(s) linking to related resources Submission history From: Nikolai Khlebtsov [ view email ] [v1] Wed, 20 May 2026 00:39:39 UTC (1,272 KB) [v2] Tue, 25 Aug 2026 08:51:39 UTC (1,272 KB) Full-text links: Access Paper: View PDF view license Current browse context: physics.optics < prev | next > new | recent | 2026-05 Change to browse by: physics References & Citations SciX Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab)

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