Silver nanowires functionalized with gold nanoparticles using a polyacrylic acid linker exhibit pH-modulated optical properties, including a shift in localized surface plasmon resonance, and triggered surface-enhanced Raman scattering (SERS) effects. The tunable optical properties are exhibited as a result of changes in particle coupling caused by the swelling response of polyacrylic acid.
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Gupta et al. (2011) studied this question.
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