Abstract
Pure Ag nanoparticles (NPs) were synthesized on glass substrates by laser dewetting and then modified with hafnium dioxide (HfO2) by a sputtering process. The optical properties and melamine detection performance of the modified Ag NPs were investigated. The results showed that the Ag NPs produced in the laser dewetting process with accumulated unit volume energies of 0.2–3.67 kJ/mm3s had a size of 51–107 nm. Furthermore, the Ag NPs exhibited an optical absorption peak in the wavelength range of 429–495 nm. A strong Raman signal fingerprint peak was observed at 701 cm−1 in a 10−3 M melamine solution. The corresponding analytical enhancement factor (AEF) was 1.9 × 102. For the Ag@HfO2 NPs, localized surface plasmon resonance (LSPR) occurred at 584–800 nm, with an AEF of 2.3 × 104. The limit of detection for melamine using the Ag@HfO2 NPs was 10−5 M. Moreover, the Ag@HfO2 NPs showed a more stable Raman spectrum than the Ag NPs. Hence, the potential of the Ag@HfO2 NPs for melamine detection was confirmed.
Published Version
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