Femtogram-Scale Photothermal Spectroscopy of Explosive Molecules on Nanostrings

Femtogram-Scale Photothermal Spectroscopy of Explosive Molecules on Nanostrings

We demonstrate detection of femtogram-scale quantities of the explosive molecule 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) via combined nanomechanical photothermal spectroscopy and mass desorption. Photothermal spectroscopy provides a spectroscopic fingerprint of the molecule, which is unavailable...

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Veröffentlicht in:Analytical chemistry (Washington) 2014-11, Vol.86 (22), p.11368-11372
Hauptverfasser: Biswas, T. S, Miriyala, N, Doolin, C, Liu, X, Thundat, T, Davis, J. P
Format: Artikel
Sprache:eng
Schlagworte:
Analytical chemistry
Compatibility
Desorption
Explosions
Explosives
Fingerprints
Molecular chemistry
Molecular Structure
Nanoparticles - analysis
Nanostructure
Nanotechnology
Photochemical Processes
RDX
Silicon Compounds - analysis
Silicon nitride
Spectroscopy
Spectrum Analysis
Temperature
Triazines - analysis
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Beschreibung
Zusammenfassung:We demonstrate detection of femtogram-scale quantities of the explosive molecule 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) via combined nanomechanical photothermal spectroscopy and mass desorption. Photothermal spectroscopy provides a spectroscopic fingerprint of the molecule, which is unavailable using mass adsorption/desorption alone. Our measurement, based on thermomechanical measurement of silicon nitride nanostrings, represents the highest mass resolution ever demonstrated via nanomechanical photothermal spectroscopy. This detection scheme is quick, label-free, and is compatible with parallelized molecular analysis of multicomponent targets.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac503318e