Nano Archive

All-optical nanoscale pH meter

Bishnoi, Sandra W. and Rozell, Christopher J. and Levin, Carly S. and Gheith, Muhammed K. and Johnson, Bruce R. and Johnson, Don H. and Halas, Naomi J. (2006) All-optical nanoscale pH meter. NANO LETTERS, 6 (8). pp. 1687-1692.

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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.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Functional and hybrid materials
ID Code:3711
Deposited By:Farnush Anwar
Deposited On:22 Jan 2009 13:30
Last Modified:29 Jan 2009 12:43

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