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Alloyed Au-Ag nanorods with desired plasmonic property and stability in harsh environment

Photonics Research
  • Yuan Ni, Caixia Kan, Longbing He, Xingzhong Zhu, Mingming Jiang, and Daning Shi
  • received 12/11/2018; accepted 03/10/2019; posted 03/11/2019; Doc. ID 354455
  • Abstract: Bio-chemical molecular detection in nanoscale, based on alloyed nanorods (NRs) with tunable surface plasmon resonance (SPR) properties and high chemical stability, has attracted particular interest. In this work, alloyed Au-Ag NRs with tunable aspect ratios were achieved by annealing Au nanobipyramids directed-Au@Ag core-shell NRs. The core-shell NRs were encapsulated within mesoporous silica outer-shells to avoid the fusion or aggregation. The structural stability of fully alloyed Au-Ag NRs, including chemical and thermal stability, is remarkably improved compared with that of Au@Ag core-shell NRs. The alloyed NRs would maintain the rod-like structure after incubated into etchant solution, while Au@Ag core-shell NRs would decay into nanobipyramids. Additionally, fully alloyed NRs present stable morphology under annealing at high temperatures up to 600 °C in air. Benefiting from excellent structural and chemical stabilities, surface-enhanced Raman scattering effect based on alloyed NRs is stable in harsh environment. Taking advantages of tunable SPR properties (400–2000 nm) and excellent stability, the obtained nanostructures can also be served as drugs carries. Perfect photo-thermal effect induced by the particular SPR of alloyed NRs can improve the release efficiency of drugs.
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