Vapor phase SERS sensor for explosives detection

Tamane, Sumedha; Topal, Ç. Özge; Kalkan, A. Kaan

doi:10.1109/nano.2011.6144447

Cited by 6 publications

(7 citation statements)

References 16 publications

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“…101 Ag nanoparticles reduced on silica film were also used for detection of sealed-chamber vapors of TNT, PETN, RDX, and TNB. 102 The results confirmed the low adsorption of nitro-explosives vapors on the silver surface, while these explosives also had a low vapor pressure at room temperature. Alternatively, instead of the so-called "passive" surface plasmon excitation used in 103 They demonstrated that it increased the intensity of the lasing emission and that they could reach a subppm detection.…”

Section: ■ Explosivessupporting

confidence: 56%

“…The detection of triacetotriperoxide (TATP), which does not have nitro groups, has also been documented on a gold nanostructured surface with variable temperatures . Ag nanoparticles reduced on silica film were also used for detection of sealed-chamber vapors of TNT, PETN, RDX, and TNB . The results confirmed the low adsorption of nitro-explosives vapors on the silver surface, while these explosives also had a low vapor pressure at room temperature.…”

Section: Explosivesmentioning

confidence: 84%

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Review of Surface Enhanced Raman Scattering Applications in Forensic Science

2015

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Section: ■ Explosivessupporting

confidence: 56%

Section: Explosivesmentioning

confidence: 84%

Review of Surface Enhanced Raman Scattering Applications in Forensic Science

2015

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“…21 Another study by Tamane et al demonstrated vapour phase detection of nitro-explosives by using AgNPs on Si where they enclosed the substrate in a sealed tube with explosive simulant at thermodynamic equilibrium. 22 They concluded that desorption and decomposition of TNT in the vapour phase hindered detection by SERS, as they observed SERS enhancement after 10 seconds followed by a decreasing signal intensity over time with splitting of several key Raman bands. In previous work, we have measured SERS of TNT in the vapour phase using a fabricated substrate consisting on a TiO 2 thin film decorated with AuNPs.…”

Section: Introductionmentioning

confidence: 99%

Sensitive and specific detection of explosives in solution and vapour by surface-enhanced Raman spectroscopy on silver nanocubes

et al. 2017

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Surface-enhanced Raman spectroscopy (SERS) has been widely utilised as a sensitive analytical technique for the detection of trace levels of organic molecules. The detection of organic compounds in the gas phase is particularly challenging due to the low concentration of adsorbed molecules on the surface of the SERS substrate. This is particularly the case for explosive materials, which typically have very low vapour pressures, limiting the use of SERS for their identification. In this work, silver nanocubes (AgNCs) were developed as a highly sensitive SERS substrate with very low limit-of-detection (LOD) for explosive materials down to the femtomolar (10 M) range. Unlike typical gold-based nanostructures, the AgNCs were found suitable for the detection of both aromatic and aliphatic explosives, enabling detection with high specificity at low concentration. SERS studies were first carried out using a model analyte, Rhodamine-6G (Rh-6G), as a probe molecule. The SERS enhancement factor was estimated as 8.71 × 10 in this case. Further studies involved femtomolar concentrations of 2,4-dinitrotoluene (DNT) and nanomolar concentrations of 1,3,5-trinitroperhydro-1,3,5-triazine (RDX), as well as vapour phase detection of DNT.

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“…Nanosensors are powerful potential sensors for the detection of trace chemical species including nitro‐explosives due to the large surface‐to‐volume ratios and high reaction activities . However, most of the sensors are in the form of chemiresistor or Chem‐field‐effect transistor (Chem‐FET), in which the conductance of the device is changed by the surface‐adsorbed molecules and depends highly on the analyte concentrations .…”

Section: Introductionmentioning

confidence: 99%

A High‐Performance Nitro‐Explosives Schottky Sensor Boosted by Interface Modulation

Yang

Dou

Zhang

et al. 2015

Adv Funct Materials

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4039wileyonlinelibrary.com mole cules and depends highly on the analyte concentrations. [8][9][10][11][12] As a result, the traditional Ohm-contacted nanosensor has diffi culty in realizing the ultrasensitive detection in real circumstances where open environment must be considered. Recently, it was demonstrated that Schottky contact could largely improve the sensitivity of nanosensors due to that Schottky barrier serves as a "gate" controlling the current passing through the barrier, [ 13,14 ] and the value of this current highly depends on the Schottky barrier height (SBH). A small change in SBH will lead to a huge change in current, which is the basis of the Schottky barrier enhanced sensing. [ 13 ] The selection of the components of the Schottky junction is of vital importance to improve the sensor performance, which highly depends on the energy band structure and adsorption characteristics. It is reported that a higher SBH favors a better sensitivity in a Schottky-gated sensor toward electron acceptor analytes detection, while for electron donor analytes detection, the result is opposite. [ 15 ] Thus, the insertion of another semiconductor that could both modulate the SBH and increase the adsorption energy will greatly increase the sensitivity and selectivity in a Schottky junction sensor. Graphene or reduced graphene oxide (rGO) with high charge carrier mobility, atomically thin nature and abundant adsorption sites, [16][17][18][19][20] makes the semiconductor/graphene Schottky heterojunction (Barristor) ultrasensitive for gas sensing. [ 21,22 ] Vertical silicon nanowires (SiNWs) array offers distinct merits in terms of the capability for surface functionalization and the suffi cient gaps for molecules diffusion, and SiNWs array-based sensor has been considered an ideal platform for gas sensing due to the higher signal-to-noise ratios and faster response. [ 23,24 ] The electron affi nity of TiO 2 (4.0 eV) is only a bit smaller than that of silicon (4.05 eV); [ 25 ] thus the insertion of TiO 2 into Si/rGO should be an ideal choice to support the above assertion. As a result, the SiNWs array/TiO 2 /rGO ternary junction will provide a new approach for designing ultrasensitive and selective sensors.Nitro-explosives is one of the most important categories in common explosives, and the detection of them has been a research focus due to plenty of adverse events, increasing threat of terrorism attack, and the need for homeland security. [ 1,9,26,27 ] The sensitive, selective, and rapid detection of nitro-explosives vapors is still a challenge due to the low vapor pressure of

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Vapor phase SERS sensor for explosives detection

Cited by 6 publications

References 16 publications

Review of Surface Enhanced Raman Scattering Applications in Forensic Science

Review of Surface Enhanced Raman Scattering Applications in Forensic Science

Sensitive and specific detection of explosives in solution and vapour by surface-enhanced Raman spectroscopy on silver nanocubes

A High‐Performance Nitro‐Explosives Schottky Sensor Boosted by Interface Modulation

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