期刊
ADVANCED OPTICAL MATERIALS
卷 10, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202102238
关键词
laser direct writing; nanorings; nanowires; plasmonics; surface-enhanced Raman scattering
资金
- National Key Research and Development Program of China [2020YFA0211300]
- National Natural Science Foundation of China (NSFC) [11974265, 21703160]
- Center for Nanoscience and Nanotechnology and Electron Microscope Center at Wuhan University
This study demonstrates a method of light-induced protrusion of gold nanowires (AuNWs) from a solid state substrate, which enables the on-chip fabrication of functional nanodevices. By irradiating gold ion-doped titanium dioxide (TiO2) films with a laser, AuNWs are grown and their morphology can be tuned by irradiation time/power and ion concentration. Nanopillars can also be generated by introducing Au seeds. The surface-enhanced Raman scattering performance of the AuNW bundles is excellent.
Gold nanowires (AuNWs) have been one of the key components for nanoelectronics and optoelectronic devices but the fabrication has been poorly customized for this purpose even though diverse synthetic strategies bloomed over the last decades. Here, the concept of light-induced protrusion of AuNWs directly from solid state substrate is demonstrated, which is highly compatible for on-chip fabrication of functional nanodevices. This is realized by irradiating the Au ion-doped titanium dioxide (TiO2) films with continuous wave laser. The blue laser triggers the reduction and nucleation of Au(0) which grows vertically into AuNW bundles with diffusion-controlled supply of Au ions within the TiO2 matrix. Thus, the morphology of the AuNWs can be tuned with irradiation time/power as well as the ion concentration, which can derive into Au nanorings (NRs) and NR stacks in 1D photonic crystal with reduced plasmon linewidth. Such light-induced protrusion can also generate nanopillars by introducing Au seeds before irradiation. The surface-enhanced Raman scattering performance of the AuNW bundles is excellent with fm detection limit. Such laser-directed solid-state growth technique is facile, versatile, cost-effective site-selective, ligand-free, and wafer-scalable, which opens up many promising applications in (bio)chemical sensing, photovoltaics, photocatalysis, plasmonic displays, and integrated nanoelectronic/optoelectronic devices.
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