All-optical nanoscale pH meter

被引：299

作者：

Bishnoi, Sandra W.

Rozell, Christopher J.

Levin, Carly S.

Gheith, Muhammed K.

Johnson, Bruce R.

Johnson, Don H.

Halas, Naomi J.

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Dept Chem, Houston, TX 77251 USA

[2] Rice Univ, Lab Nanophoton, Houston, TX 77251 USA

来源：

NANO LETTERS | 2006年 / 6卷 / 08期

关键词：

D O I：

10.1021/nl060865w

中图分类号：

O6 [化学];

学科分类号：

0703 [化学];

摘要：

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.

引用

收藏

页码：1687 / 1692

页数：6

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