Enhanced Raman Scattering of 2,4,6-TNT Using Metallic Colloids

Jerez-Rozo, Jackeline I.; Primera-Pedrozo, Oliva M.; Barreto-Cabán, Marcos A.; Hernández‐Rivera, Samuel P.

doi:10.1109/jsen.2008.923229

Cited by 29 publications

(37 citation statements)

References 25 publications

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“…For this reason, few studies related to these issues are found in the literature. Most of them deal with SERS studies of these species in aqueous solutions [27,28]. Figure 5 shows normal Raman spectrum of solid TNT, 2,4-DNT, and 1,3,5-TNB obtained with the R-3000QE Raman 785 nm spectrometer.…”

Section: Resultsmentioning

confidence: 99%

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Highly Sensitive Filter Paper Substrate for SERS Trace Explosives Detection

Fierro-Mercado

Hernández‐Rivera

2012

International Journal of Spectroscopy

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We report on a novel and extremely low-cost surface-enhanced Raman spectroscopy (SERS) substrate fabricated depositing gold nanoparticles on common lab filter paper using thermal inkjet technology. The paper-based substrate combines all advantages of other plasmonic structures fabricated by more elaborate techniques with the dynamic flexibility given by the inherent nature of the paper for an efficient sample collection, robustness, and stability. We describe the fabrication, characterization, and SERS activity of our substrate using 2,4,6-trinitrotoluene, 2,4-dinitrotoluene, and 1,3,5-trinitrobenzene as analytes. The paper-based SERS substrates presented a high sensitivity and excellent reproducibility for analytes employed, demonstrating a direct application in forensic science and homeland security.

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Section: Resultsmentioning

confidence: 99%

“…These observations suggest a change in the molecular symmetry of TNT when it is adsorbed on the substrate. The enhancement of the in-plane deformation mode implies that TNT molecules lie perpendicular on the gold nanoparticles surface [27].…”

Section: Resultsmentioning

confidence: 99%

Highly Sensitive Filter Paper Substrate for SERS Trace Explosives Detection

Fierro-Mercado

Hernández‐Rivera

2012

International Journal of Spectroscopy

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“…Surface‐enhanced Raman scattering (SERS) spectroscopy has the potential to serve as a rapid screening tool for detecting many different chemical and biological agents. For example, SERS has been demonstrated to be a useful technique for the identification of explosives,6–10 chemical warfare agents,11, 12 and bacteria 13–15. The vibrational spectrum generated using this technique provides a ‘fingerprint’ of the chemical composition of each agent.…”

Section: Introductionmentioning

confidence: 99%

Determination of Band Structure Parameters and the Quasi‐Particle Gap of CdSe Quantum Dots by Cyclic Voltammetry

2008

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Band structure parameters such as the conduction band edge, the valence band edge and the quasi-particle gap of diffusing CdSe quantum dots (Q-dots) of various sizes were determined using cyclic voltammetry. These parameters are strongly dependent on the size of the Q-dots. The results obtained from voltammetric measurements are compared to spectroscopic and theoretical data. The fit obtained to the reported calculations based on the semi-empirical pseudopotential method (SEPM)-especially in the strong size-confinement region, is the best reported so far, according to our knowledge. For the smallest CdSe Q-dots, the difference between the quasi-particle gap and the optical band gap gives the electron-hole Coulombic interaction energy (J(e1,h1)). Interband states seen in the photoluminescence spectra were verified with cyclic voltammetry measurements.

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“…In recent years SERS on nanoparticulate colloids has been heavily applied to the detection of illicit materials, such as explosives [ 16 , 17 ]. The technique has been shown to be capable of detecting a range of high explosives, with good detection limits (into the nanomolar region or below), even with raw colloidal solutions of Au and AgNPs, such as those applied by the group of Hernández-Rivera [ 18 , 19 ]. By aggregating AuNPs at an interface, Edel et al created a regular monolayer array, which showed enhanced sensitivity to a range of compounds, including some explosives [ 20 ].…”

Section: Example 1 - Gold Nanoparticlesmentioning

confidence: 99%