Abstract
We demonstrated flower-like 3D Ag-Au hetero-nanostructures on an indium tin oxide glass (ITO glass) for surface enhanced Raman scattering (SERS) applications. The flower-like 3D Ag nanostructures were obtained through electrodeposition with liquid crystalline soft template which is simple, controllable and cost effective. The flower-like 3D Ag-Au hetero-nanostructures were further fabricated by galvanic replacement reaction of gold (III) chloride trihydrate (HAuCl4·3H2O) solution and flower-like Ag. The flower-like Ag-Au hetero-nanostructure exhibited stronger SERS effects and better chemical stability compared with flower-like Ag nanostructure. The localized surface plasmon resonance (LSPR) spectra, field emission scanning electron microscope (FESEM) photos and Ag-Au ratios were studied which show that the surface morphology and shape of the flower-like Ag-Au hetero-nanostructure play significant roles in enhancing SERS. The flower-like 3D Ag-Au hetero-nanostructures fabricated by electrodeposition in liquid crystalline template and galvanic replacement reaction are simple, cheap, controllable and chemical stable. It is a good candidate for applications in SERS detection and imaging.
Highlights
Surface enhanced Raman scattering (SERS) is a technique for enhancing the Raman scattering intensity which rapidly becomes a powerful method for applications in fundamental and applied research such as medicine[1,2,3], biotechnology[4,5,6], catalysis[7], imaging[8] and sensing[9,10,11]
The morphology was observed by a field emission scanning electron microscope (FESEM)
We have demonstrated the highly effective surface enhanced Raman scattering substrate with flower-like 3D Ag-Au hetero-nanostructures fabricated by electrodeposition in liquid crystalline phase and galvanic replacement reaction
Summary
Surface enhanced Raman scattering (SERS) is a technique for enhancing the Raman scattering intensity which rapidly becomes a powerful method for applications in fundamental and applied research such as medicine[1,2,3], biotechnology[4,5,6], catalysis[7], imaging[8] and sensing[9,10,11]. The effective solution for improving the chemical stability of silver nanostructures is to form an alloy or hetero-nanostructures with a more stable metal such as Au15,21 Such method may reduce the SERS enhancement effect because the electrons in Au are less sensitive to the electric field[22]. The flower-like metal nanostructure substrates with large scale uniformity, high enhancement factor and high chemical stability still need to be studied. We investigated the flower-like Ag-Au hetero-nanostructures on an ITO glass substrate for SERS applications by electrodeposition with liquid crystal template and galvanic replacement reaction which is simple and cost-effective. The chemical stability was studied which shows that the flower-like Ag-Au hetero-nanostructures is better than the flower-like Ag nanostructures Such Ag-Au hetero-nanostructures fabricated by liquid crystal template and galvanic replacement reaction are good candidate for applications in SERS detection and imaging
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