by S.W. Bishnoi, C.J. Rozell, C.S. Levin, M.K. Gheith, B.R. Johnson, D.H. Johnson and N.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 quantitatively assessed. 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.
Reference:
All-optical nanoscale pH meterS.W. Bishnoi, C.J. Rozell, C.S. Levin, M.K. Gheith, B.R. Johnson, D.H. Johnson and N.J Halas. Nano Letters, 6(8), pp. 1687–1692, August 2006.
Bibtex Entry:
@ARTICLE{bishnoi.06,
author = {Bishnoi,S.W. and Rozell,C.J. and Levin,C.S. and Gheith,M.K. and Johnson,B.R. and Johnson,D.H. and Halas, N.J},
title = {All-optical nanoscale {pH} meter},
journal = {Nano Letters},
year = {2006},
volume = {6},
number = {8},
pages = {1687--1692},
month = {August},
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 quantitatively assessed. 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.},
url = {http://pubs.acs.org/doi/abs/10.1021/nl060865w}
}