Abstract
The advancement of nanoenabled wafer-based devices requires the establishment of core competencies related to the deterministic positioning of nanometric building blocks over large areas. Within this realm, plasmonic single-crystal gold nanotriangles represent one of the most attractive nanoscale components but where the formation of addressable arrays at scale has heretofore proven impracticable. Herein, a benchtop process is presented for the formation of large-area periodic arrays of gold nanotriangles. The devised growth pathway sees the formation of an array of defect-laden seeds using lithographic and vapor-phase assembly processes followed by their placement in a growth solution promoting planar growth and threefold symmetric side-faceting. The nanotriangles formed in this high-yield synthesis distinguish themselves in that they are epitaxially aligned with the underlying substrate, grown to thicknesses that are not readily obtainable in colloidal syntheses, and present atomically flat pristine surfaces exhibiting gold atoms with a close-packed structure. As such, they express crisp and unambiguous plasmonic modes and form photoactive surfaces with highly tunable and readily modeled plasmon resonances. The devised methods, hence, advance the integration of single-crystal gold nanotriangles into device platforms and provide an overall fabrication strategy that is adaptable to other nanomaterials.
| Original language | English |
|---|---|
| Article number | 2205780 |
| Journal | Small |
| Volume | 18 |
| Issue number | 52 |
| DOIs | |
| State | Published - Dec 28 2022 |
Funding
R.D.N., Z.R.L., and W.J.T. contributed equally to this work. This work was supported by the National Science Foundation, Division of Chemistry, Macromolecular, Supramolecular, and Nanochemistry (MSN) Program under Grant No. CHE−2107728 to S.N. The computational calculations (J.A., M.T.K.) were conducted with support of the UCloud services provided by the eScience Center at SDU. The EELS work (V.K., J.P.C.) was supported by the Air Force Office of Scientific Research under Award FA9550‐21‐1‐0282. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the United States Air Force. The STEM‐EELS experiments were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This research was conducted, in part, using instrumentation within ORNL's Materials Characterization Core provided by UT‐Battelle, LLC, under Contract No. DE‐AC05‐00OR22725 with the DOE, and sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT‐Battelle, LLC, for the U.S. Department of Energy. W.J.T. acknowledges support received through a Notre Dame Materials Science and Engineering Fellowship. The work has benefitted from the facilities available through the Notre Dame Integrated Imaging Facility (NDIIF) and the expertise of F. T. Limpoco (Oxford Instruments Asylum Research) in AFM imaging. R.D.N., Z.R.L., and W.J.T. contributed equally to this work. This work was supported by the National Science Foundation, Division of Chemistry, Macromolecular, Supramolecular, and Nanochemistry (MSN) Program under Grant No. CHE−2107728 to S.N. The computational calculations (J.A., M.T.K.) were conducted with support of the UCloud services provided by the eScience Center at SDU. The EELS work (V.K., J.P.C.) was supported by the Air Force Office of Scientific Research under Award FA9550-21-1-0282. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the United States Air Force. The STEM-EELS experiments were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This research was conducted, in part, using instrumentation within ORNL's Materials Characterization Core provided by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the DOE, and sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. W.J.T. acknowledges support received through a Notre Dame Materials Science and Engineering Fellowship. The work has benefitted from the facilities available through the Notre Dame Integrated Imaging Facility (NDIIF) and the expertise of F. T. Limpoco (Oxford Instruments Asylum Research) in AFM imaging.
| Funders | Funder number |
|---|---|
| National Science Foundation | |
| U.S. Department of Energy | |
| Division of Chemistry | CHE−2107728 |
| Air Force Office of Scientific Research | FA9550‐21‐1‐0282 |
| Office of Science | DE-AC05-00OR22725 |
| Oak Ridge National Laboratory | |
| Notre Dame Integrated Imaging Facility, University of Notre Dame | |
| Shanxi Datong University |
Keywords
- Brij-700
- epitaxy
- gold
- nanoplates
- nanotriangles
- periodic arrays