| Title: | Controlling Atomic-Scale Restructuring and Cleaning of Gold Nanogap Multilayers for Surface-Enhanced Raman Scattering Sensing |
| Author(s): | Grys DB; Niihori M; Arul R; Sibug-Torres SM; Wyatt EW; de Nijs B; Baumberg JJ; |
| Address: | "NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, U.K" |
| DOI: | 10.1021/acssensors.3c00967 |
| ISSN/ISBN: | 2379-3694 (Electronic) 2379-3694 (Linking) |
| Abstract: | "We demonstrate the reliable creation of multiple layers of Au nanoparticles in random close-packed arrays with sub-nm gaps as a sensitive surface-enhanced Raman scattering substrate. Using oxygen plasma etching, all the original molecules creating the nanogaps can be removed and replaced with scaffolding ligands that deliver extremely consistent gap sizes below 1 nm. This allows precision tailoring of the chemical environment of the nanogaps which is crucial for practical Raman sensing applications. Because the resulting aggregate layers are easily accessible from opposite sides by fluids and by light, high-performance fluidic sensing cells are enabled. The ability to cyclically clean off analytes and reuse these films is shown, exemplified by sensing of toluene, volatile organic compounds, and paracetamol, among others" |
| Keywords: | "*Metal Nanoparticles/chemistry Gold/chemistry Spectrum Analysis, Raman/methods AuNP aggregates Sers cleaning nanogap sensing;" |
| Notes: | "MedlineGrys, David-Benjamin Niihori, Marika Arul, Rakesh Sibug-Torres, Sarah May Wyatt, Elle W de Nijs, Bart Baumberg, Jeremy J eng Research Support, Non-U.S. Gov't 2023/07/06 ACS Sens. 2023 Jul 28; 8(7):2879-2888. doi: 10.1021/acssensors.3c00967. Epub 2023 Jul 6" |
