Focused-ion-beam-fabricated Au nanorods coupled with Ag nanoparticles used as surface-enhanced Raman scattering-active substrate for analyzing trace melamine constituents in solution

摘要: A well-ordered Au-nanorod array with a controlled tip ring diameter (Au_NRsd) was fabricated using the focused ion beam method. Au_NRsd then coupled Ag nanoparticles (Ag NPs) to bridge gaps among Au nanorods. The effect of surface-enhanced Raman scattering (SERS) on and NPs/Au_NRsd particularly verified crystal violet (CV) as molecular probe. intensity obtained from characteristic peak CV estimated by an enhancement factor ≈10(7) in magnitude, which increased ≈10(12) magnitude for that NPs/Au_NRsd. highly SERS-active furthermore applied detection melamine (MEL) at very low concentrations. Raman-active peaks MEL (10(-3) 10(-12)M) water or milk solution upon were well distinguished. 680 702 cm(-1) molecules found suitable be used index sensing low-concentration varied solution, while 1051 practical interpret bonded (i.e., Au_NRsd) NPs/Au_NRsd) surface. At interface laser-induced electromagnetic field hotspot produced competent sense interacting surfaces. Accordingly, is promising fast sensitive tool screening complex matrices such adulteration e.g., food pharmaceutical products.