Preparation and characterization of Ag@C composites with hexagon silver core and controllable carbon shell for surface-enhanced Raman scattering

Nanoporous silver fabricated with pretreated Ag–Al alloy toward surface enhanced Raman sensing

“…Recent reports have shown that the stability of carbon materials can enhance the antioxidant capacity of silver, thereby improving its stability. For example, Liu et al [22] utilized carbon coating for encapsulation, while Gao et al [23] adopted graphene oxide coating, both methods utilize the properties of carbon materials to enhance the antioxidant capacity of silver. Here,we successfully fabricated NPS with α-terpineol pretreated Ag 55 Al 45 alloy thin films by a dealloying in both acid and alkaline solution.…”

Facile fabrication of Ag@C@C8 nanoparticles as a SERS substrate and their environmental applications

“…The hexagonal shape of the Ag core and the substrate's outstanding SERS performance and long-term stability enable it to be used in a wide variety of applications. 8 Wang et al synthesized carbon-coated silver (Ag@C) nanocubes with a cubic silver core and an ultrathin amorphous carbon coating (∼4 nm); the carbon layer shields the Ag nanocubes from oxidation and stabilizes the structure of the Ag cores. 9 While the use of a core-shell structure resolves the issue of silver substrate instability, another concern is relatively low sensitivity.…”

Improved Stability of Metal Nanowires via Electron Beam Irradiation Induced Surface Passivation

“…9,10 Noble metals are conductive but require relatively thick thickness to achieve a pore-free layer for sufficient protection 11,12 and their cost needs to be concerned for mass production. 13 Carbon materials, especially graphene and graphene oxide with highly impermeable to gases and excellent chemical inert, 14,15 have also been used as anticorrosion barriers. 16,17 However, ensuring uniform and well-defined coverage of these 2D carbon sheets on the whole nanowires is required to avoid accelerated corrosion on the uncovered area but remains a challenge.…”

“…Specifically, dense and stable metal oxide shells provide satisfactory protection but at the expense of electrical conductivity along the radial direction limiting their applications in optoelectronic devices. , Noble metals are conductive but require relatively thick thickness to achieve a pore-free layer for sufficient protection , and their cost needs to be concerned for mass production . Carbon materials, especially graphene and graphene oxide with highly impermeable to gases and excellent chemical inert, , have also been used as anticorrosion barriers. , However, ensuring uniform and well-defined coverage of these 2D carbon sheets on the whole nanowires is required to avoid accelerated corrosion on the uncovered area but remains a challenge . Organic precursors such as glucose have been introduced for carbon layer encapsulation during metal nanowires synthesis but are always thick and porous .…”