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首页> 外文期刊>Nanotechnology >Photoacoustic spectroscopy of surface adsorbed molecules using a nanostructured coupled resonator array
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Photoacoustic spectroscopy of surface adsorbed molecules using a nanostructured coupled resonator array

机译：使用纳米结构耦合谐振器阵列的表面吸附分子的光声光谱

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摘要

A rapid method of obtaining photoacoustic spectroscopic signals for trace amounts of surface adsorbed molecules using a nanostructured coupled resonator array is described. Explosive molecules adsorbed on a nanoporous anodic aluminum oxide cantilever, which has hexagonally ordered nanowells with diameters and well-to-well distances of 35 nm and 100 nm, respectively, are excited using pulsed infrared (IR) light with a frequency matching the common mode resonance frequency of the coupled resonator. The common mode resonance amplitudes of the coupled resonator as a function of illuminating IR wavelength present a photoacoustic IR absorption spectrum representing the chemical signatures of the adsorbed explosive molecules. In addition, the mass of the adsorbed molecules as an orthogonal signal for quantitative analysis is determined by measuring the variation of the localized, individual mode resonance frequency of a cantilever on the array. The limit of detection of the ternary mixture of explosive molecules (1:1:1 of trinitrotoluene (TNT), cyclotrimethylene trinitramine (RDX) and pentaerythritol tetranitrate (PETN)) is estimated to be ~100 ng cm~(-2). These multi-modal signals enable us to perform quantitative and rapid chemical sensing and analysis in ambient conditions.
机译：描述了一种使用纳米结构耦合谐振器阵列快速获得痕量表面吸附分子的光声光谱信号的方法。使用脉冲红外（IR）光激发吸附在纳米多孔阳极氧化铝悬臂上的爆炸性分子，该纳米悬臂具有直径分别为35 nm和100 nm的六角形有序纳米孔，并通过脉冲红外（IR）光激发频率耦合谐振器的谐振频率。耦合谐振器的共模谐振幅度随照明IR波长的变化而呈现出光声IR吸收光谱，该光谱代表了所吸附炸药分子的化学特征。此外，通过测量阵列上悬臂的局部，单模共振频率的变化，可以确定作为定量分析正交信号的吸附分子的质量。爆炸性分子（三硝基甲苯（TNT），环三亚甲基三硝胺（RDX）和季戊四醇四硝酸酯（PETN）的1：1）的三元混合物的检出限估计为〜100 ng cm〜（-2）。这些多模式信号使我们能够在环境条件下进行定量和快速的化学感测和分析。

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