Nanotechnology-Based Detection of Explosives and Biological Agents Simulants

Primera-Pedrozo, Oliva M.; Jerez-Rozo, Jackeline I.; Cruz-Montoya, Edwin De La; Luna-Pineda, Tatiana; Pacheco‐Londoño, Leonardo C.; Hernández‐Rivera, Samuel P.

doi:10.1109/jsen.2008.923936

Cited by 47 publications

(35 citation statements)

References 33 publications

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“…This property has resulted in LSPRs being applied to sensing and detection of chemicals, biological agents, phase transitions and chemical reactions [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

et al. 2015

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The localized surface plasmon resonance (LSPR) of nanoparticles can be a powerful and sensitive probe of chemical changes in nanoscale volumes. Here we have used the LSPR of silver (Ag) to study the oxidation kinetics of nanoscopic volumes of cobalt (Co) metal. Bimetal nanoparticles of the immiscible Co-Ag system prepared by pulsed laser dewetting were aged in ambient air and the resulting changes to the LSPR signal and bandwidth were used to probe the oxidation kinetics. Co was found to preferentially oxidize first. This resulted in a significant enhancement by a factor of 8 or more in the lifetime of stable Ag plasmons over that of pure Ag. Theoretical modeling based on optical mean field approximation was able to predict the oxidation lifetimes and could help design stable Ag-based plasmonic nanoparticles for sensing applications.

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“…This property has resulted in LSPRs being applied to sensing and detection of chemicals, biological agents, phase transitions and chemical reactions [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

et al. 2015

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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%

“…The potential of SERS for trace analysis of explosives has been explored in recent years 7, 8, 11, 19. In an early study, Kneipp et al 7 reported a minimum detection limit of 10 −7 M for trinitrotoluene (TNT) adsorbed on gold and silver nanoparticles in laboratory‐prepared solutions.…”

Section: Introductionmentioning

confidence: 99%

“…In an early study, Kneipp et al 7 reported a minimum detection limit of 10 −7 M for trinitrotoluene (TNT) adsorbed on gold and silver nanoparticles in laboratory‐prepared solutions. More recently, a detection limit of 10 −12 M for TNT was achieved by using synthesized Ag nanoparticles as SERS substrates and by adjusting the pH of the TNT aqueous solution 11. SERS was also found to be applicable for detecting the chemical vapor signature emanating from buried TNT‐based landmines at a concentration level of 5 µg/l using a flow‐through probe head design and electrochemically etched gold substrates 8.…”

Section: Introductionmentioning

confidence: 99%

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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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“…As a general purpose analytical method, the applications for Raman spectroscopy span a broad range of fields that includes protein-protein interaction analysis, DNA/RNA hybridization, aptamer conformational change, viral particle detection, bacteria identification, and detection of explosives [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Surface-enhanced Raman scattering nanodomes fabricated by nanoreplica molding

Choi

et al. 2010

2010 IEEE Sensors

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We demonstrate a surface-enhanced Raman scattering substrate consisting of a closely spaced metal nanodome array fabricated on flexible plastic film. We used a low cost, large area replica molding process to produce a 2-dimensional periodic array of cylinders that is subsequently overcoated with SiO 2 and silver thin films to form dome-shaped structures. Finite element modeling was used to investigate the electromagnetic field distribution of the nanodome array structure and the effect of the nanodome separation distance on the electromagnetic field enhancement. The SERS enhancement from the nanodome array substrates was experimentally verified using rhodamine 6G as the analyte. With a separation distance of 17 nm achieved between adjacent domes using a process that is precisely controlled during thin film deposition, a reproducible SERS enhancement factor of 1.37×10 8 was demonstrated.The nanoreplica molding process presented in this work allows for simple, low cost, high-throughput fabrication of uniform nanoscale SERS substrates over large surface areas without the requirement for high resolution lithography or defect-free deposition of spherical microparticle monolayer templates.

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Nanotechnology-Based Detection of Explosives and Biological Agents Simulants

Cited by 47 publications

References 33 publications

Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

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

Surface-enhanced Raman scattering nanodomes fabricated by nanoreplica molding

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