All-optical nanoscale pH meter |
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Authors: | Bishnoi Sandra W Rozell Christopher J Levin Carly S Gheith Muhammed K Johnson Bruce R Johnson Don H Halas Naomi J |
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Affiliation: | Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, P O Box 1892, Houston, Texas 77251-1892, USA. |
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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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