Abstract
A patterned Ag structure was grown on a Si nanoporous pillar array (Si-NPA) by animmersion plating method, and its surface-enhanced Raman scattering (SERS) activitytoward adenine was studied. It was shown that two kinds of Ag structures were grown onSi-NPA, a continuous film covering the Si-NPA substrate and composed of Agnanocrystallites (nc-Ag), and a quasi-regular, interconnected network composed ofloop-chains of sub-micron Ag crystallites surrounding the porous Si pillars. The SERSdetection of low-concentration adenine solution was performed by using Ag/Si-NPA asactive substrates, in which significantly enhanced Raman signals were observed. The SERSenhancement was attributed to the active spacing sites formed between the Agparticles and the nc-Ag which met the optimal size for causing a SERS effect. Basedon the measured SERS spectra, the adsorption mode of adenine molecules onAg particles was deduced. These results indicated that Ag/Si-NPA might be apromising active substrate for SERS detection of low-concentration bio-molecules.
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