Nanoporous gold as a highly active substrate for surface-enhanced Raman scattering spectroscopy

Journal Article · Tue Mar 28 00:00:00 EST 2006 · Applied Physics Letters

OSTI ID:900430

Kucheyev, S O; Hayes, J R; Biener, J; Hamza, A V

Colloidal solutions of metal nanoparticles are currently among most studied substrates for sensors based on surface-enhanced Raman scattering (SERS). However, such substrates often suffer from not being cost-effective, reusable, or stable. Here, we develop nanoporous Au as a highly active, tunable, a.ordable, stable, bio-compatible, and reusable SERS substrate. Nanoporous Au is prepared by a facile process of free corrosion of AgAu alloys followed by annealing. Results show that nanofoams with average pore sizes of {approx} 250 nm exhibit the largest SERS signal for 632.8 nm excitation. This is attributed to the electromagnetic SERS enhancement mechanism with additional field localization within pores.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 900430
• Report Number(s): UCRL-JRNL-220317; APPLAB; TRN: US200711%%126
• Journal Information: Applied Physics Letters, Vol. 89, Issue 053102; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ANNEALING
CORROSION
EXCITATION
GOLD
SCATTERING
SPECTROSCOPY
SUBSTRATES