Hollow and nanoporous Ag sub-microcubes as SERS substrates.

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Silver ammonia complex solutions can be used to synthesize materials.
• Sacrificial templating is a viable method for creating nanostructures.
• Surface-enhanced Raman scattering (SERS) requires nanostructured substrates.

Purpose of the Study:

• To develop a new method for synthesizing silver sub-microcages.
• To evaluate the SERS performance of the synthesized silver sub-microcages.

Main Methods:

• Direct evaporation of silver ammonia complex solution to form Ag(NH3)2NO3 microcubes.
• Controlled crumbling of microcubes in Na3Cit solution to create Ag3Cit sub-microcubes.
• Formation of Ag sub-microcages using Ag3Cit sub-microcubes as sacrificial templates.

Main Results:

• Uniform Ag(NH3)2NO3 microcubes were successfully synthesized.
• Ag3Cit sub-microcubes were obtained by crumbling the microcubes.
• Ag sub-microcages were fabricated with high uniformity.
• The resulting Ag cages demonstrated ultra-high SERS sensitivity for R6G and thiram detection.

Conclusions:

• A facile method for producing Ag sub-microcages was established.
• The synthesized Ag sub-microcages show great potential as SERS substrates.
• This work contributes to the development of sensitive detection platforms.