Controlled etching and tapering of Au nanorods using cysteamine

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dc.contributor.authorSzychowski, Brian
dc.contributor.authorLeng, Haixu
dc.contributor.authorPelton, Matthew
dc.contributor.authorDaniel, Marie-Christine
dc.date.accessioned2022-07-13T18:44:03Z
dc.date.available2022-07-13T18:44:03Z
dc.date.issued2018-08-31
dc.description.abstractWhile gold nanorods (AuNRs) have found many applications due to their unique optical properties, a few challenges persist in their synthesis. Namely, it is often difficult to reproducibly synthesize AuNRs with specific and monodisperse sizes, especially at shorter aspect ratios. Here, we report a method of post-synthesis precise tailoring of AuNRs by etching with cysteamine. Cysteamine selectively etches AuNRs from their ends while preserving the initial rod shape and monodispersity, making this a viable means of obtaining highly monodisperse short AuNRs down to aspect ratio 2.3. Further, we explore the effect of this etching method on two types of silica-coated AuNRs: silica side-coated and silica end-coated AuNRs. We find that the etching process is cysteamine concentration-dependent and can lead to different degrees of sharpening of the silica-coated AuNRs, forming elongated tips. We also find that cysteamine behaves only as a ligand at concentrations above 200 mM, as no etching of the AuNRs is observed in this condition. Simulations show that excitation of plasmon resonances in these sharpened AuNRs produces local electric fields twice as strong as those produced by conventional AuNRs. Thus, cysteamine etching of AuNRs is shown to be an effective means of tailoring both the size and shape of AuNRs along with their corresponding optical properties. At the same time, the resulting cysteamine coating on the etched AuNRs displays terminal amino groups that allow for further functionalization of the nanorods.en_US
dc.description.sponsorshipThis project was supported by the National Institute of Standards and Technology under Award Number 14D295 and by the National Science Foundation under Award Number CHE 1507462. The authors wish to thank Dr. Tagide deCarvalho for her help with TEM imaging at the UMBC Keith R. Porter Imaging Facility and Dr. Laszlo Takacs for his help with STEM imaging at the UMBC NanoImaging Facility (NIF).en_US
dc.description.urihttps://pubs.rsc.org/en/content/articlelanding/2018/nr/c8nr05325aen_US
dc.format.extent8 pagesen_US
dc.genrejournal articlesen_US
dc.genrepostprintsen_US
dc.identifierdoi:10.13016/m2a9xv-qhfj
dc.identifier.citationSzychowski, Brian, et al. “Controlled etching and tapering of Au nanorods using cysteamine.” Nanoscale 35 (2018): 16830-16838. http://dx.doi.org/10.1039/C8NR05325Aen_US
dc.identifier.urihttps://doi.org/10.1039/C8NR05325A
dc.identifier.urihttp://hdl.handle.net/11603/25149
dc.language.isoen_USen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Student Collection
dc.relation.ispartofUMBC Chemistry & Biochemistry Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.titleControlled etching and tapering of Au nanorods using cysteamineen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-6370-8765en_US
dcterms.creatorhttps://orcid.org/0000-0002-7336-5655en_US

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