All-Optical Nanoscale pH Meter
Nano Letters2006Vol. 6(8), pp. 1687–1692
Citations Over TimeTop 10% of 2006 papers
Sandra Whaley Bishnoi, Christopher J. Rozell, Carly S. Levin, Muhammed K. Gheith, Bruce R. Johnson, Don H. Johnson, Naomi J. Halas
Abstract
We show that an Au nanoshell with a pH-sensitive molecular adsorbate functions as a standalone, all-optical nanoscale pH meter that monitors its local environment through the pH-dependent surface-enhanced Raman scattering (SERS) spectra of the adsorbate molecules. Moreover, we also show how the performance of such a functional nanodevice can be assessed quantitatively. The complex spectral output is reduced to a simple device characteristic by application of a locally linear manifold approximation algorithm. The average accuracy of the nano-"meter" was found to be +/-0.10 pH units across its operating range.
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