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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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl060865w
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.
|Subjects:||Analytical Science > Microscopy and probe methods|
Material Science > Functional and hybrid materials
|Deposited By:||Farnush Anwar|
|Deposited On:||22 Jan 2009 13:30|
|Last Modified:||29 Jan 2009 12:43|
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