All-optical nanoscale pH meter
All-optical nanoscale pH meter
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DOI：
10.1021/nl060865w
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发表时间：
2006-08-09
期刊：
影响因子：
10.8
通讯作者：
Halas, Naomi J.
中科院分区：
文献类型：
--
作者：
Bishnoi, Sandra W.;Rozell, Christopher J.;Halas, Naomi J.
我们发现，具有pH敏感分子吸附质的金纳米壳可以作为一个独立的全光学纳米pH计，通过吸附分子的pH依赖表面增强拉曼散射（SERS）光谱来监测其局部环境。此外，我们还展示了如何定量评估这种功能纳米器件的性能。通过应用局部线性流形近似算法，将复杂的光谱输出简化为简单的器件特性。纳米“米”的平均精度被发现在其工作范围内为+/- 0.10 pH单位。
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.