Cavitand-Decorated Silicon Columnar Nanostructures for the Surface Recognition of Volatile Nitroaromatic Compounds

Tudisco, Cristina; Motta, Alessandro; Barboza, Tahnie; Massera, Chiara; Giuffrida, Alessandro; Pinalli, Roberta; Dalcanale, Enrico; Condorelli, Guglielmo G.

doi:10.1021/acsomega.8b01018

Cited by 6 publications

(12 citation statements)

References 56 publications

(125 reference statements)

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“…of 285.0 eV is typically associated to hydrocarbon atoms (aliphatic and aromatic) ,, as well as to the adventitious carbon. ,, The second component at the B.E. of 286.5–286.6 eV is associated to oxidized carbons of the adventitious C–O species often found on oxidized silicon surfaces ,,, and to C–N-containing species (aminoterephthalate and DMF) . A third component at 288.8 and 288.5 eV for NH 2 -Mil-101 and Mil-101, respectively, is typical of carboxylate groups (COO – ), , and it is a clear indication of the presence of the terephthalate species.…”

Section: Resultsmentioning

confidence: 99%

“…The first component at the binding energy (B.E.) of 285.0 eV is typically associated to hydrocarbon atoms (aliphatic and aromatic) ,, as well as to the adventitious carbon. ,, The second component at the B.E. of 286.5–286.6 eV is associated to oxidized carbons of the adventitious C–O species often found on oxidized silicon surfaces ,,, and to C–N-containing species (aminoterephthalate and DMF) .…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption/desorption behaviors of nitrobenzene (NB) and toluene (Tol) vapors on Mil-101 and NH 2 -Mil-101 layers were evaluated and compared to their adsorption/desorption on the analogous Mil-101 and NH 2 -Mil-101 powders. The adopted aromatic vapors (NB and Tol) are two toxic and carcinogenic pollutants produced during industrial processes. , In particular, Tol is a typical VOC, , while NB has mainly been considered a water contaminant . However, the presence of NB in air is also relevant due to its non-negligible volatility and its release in air as undried exhaust gases from industrial plants. , The adsorption of NB vapors is also important for the detection of explosives. , The use of these two compounds that are both monosubstituted benzenes allowed for a comparison between polar and nonpolar aromatic molecules with similar structures.…”

Section: Introductionmentioning

confidence: 99%

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Direct Growth on Si(100) of Isolated Octahedral Mil-101(Fe) Crystals for the Separation of Aromatic Vapors

et al. 2019

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Octahedral crystals of Fe(III)-based Mil-101 and amino-functionalized Mil-101 are directly grown on Si(100) using easy solution routes under mild conditions. Images from microscopy analyses show that samples consist of a layer of isolated octahedral crystals in which the [111]direction develops vertically with respect to the Si(100) substrate. Structural and chemical characterizations indicate that crystals consist of Mil-101(Fe) with the following stoichiometry: Fe 3 (O)Cl-(DMF) 2 (Terepht) 3 (DMF = dimethylformamide and Terepht = terephthalate or aminoterephthalate). Both Si-grown Mil-101(Fe) and NH 2 -Mil-101(Fe) layers are capable of adsorbing two aromatic gases with different polarities, toluene and nitrobenzene. Their characteristic thermal desorption profiles depend on the aminofunctionalization of the terephthalate ligand as well as on the mutual interactions between the two guests when adsorbed from a mixture. It is also shown that, by adapting suitable experimental conditions, Mil-101(Fe) layers are capable of separating a toluene/nitrobenzene gas mixture through selective thermal desorption. A model based on the evaluation of the involved host−guest interactions through the density functional theory (DFT) approach is proposed to explain the observed selective desorption and to account for the key parameters involved in the desorption process of aromatic vapors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct Growth on Si(100) of Isolated Octahedral Mil-101(Fe) Crystals for the Separation of Aromatic Vapors

et al. 2019

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“…Gas adsorption was evaluated by exposing samples to vapors of aromatic compounds according to previously reported approaches [44,45]. Briefly, vapor adsorption was obtained by placing a-Si grown ZIF-8 films for 30 min in a closed chamber saturated at 25°C with toluene, nitrobenzene and water vapors (vapor pressures of about 3x10 3 Pa, 30 Pa and 3x10 3 Pa, respectively, calculated according to the Antoine equation [46]).…”

Section: Sample Characterizationmentioning

confidence: 99%

Heterogeneous growth of continuous ZIF-8 films on low-temperature amorphous silicon

Monforte

Mannino

Alberti

et al. 2019

Applied Surface Science

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Thin amorphous silicon films, deposited at low temperature by Inductively Coupled Plasma Chemical Vapor Deposition, have, for the first time, been employed as substrate for ZIF-8 growth. In order to investigate the role of the surface chemistry on the nucleation process, films have also been grown on other silicon-based substrates such as H-terminated Si(100), SiO 2 and quartz. Film preparation was carried out at room temperature using a mixed Zn nitrate and imidazole solution in methanol or ethanol. Using methanol, continuous ZIF-8 films were obtained on amorphous Si and Hterminated Si(100), while less homogeneous films were formed on the other surfaces. In ethanol, slower growth rates occurred and thinner films, compared to the ones in methanol, were obtained.These slower rates highlight the different effects of the four surfaces on the growth process. These differences have been related to the silanol density of the surfaces and to the Lewis basic strength which affect imidazole moiety deprotonation. H-terminated Si(100) and amorphous Si turned out to be the most reactive surfaces, whereas on quartz and, especially, on SiO 2 reactivity was much lower.Experimental results have been validated by the DFT modelling of the proton exchange, which takes place between the imidazole group and the surface. Finally, the VOCs adsorption capability of ZIF-8 films grown on amorphous silicon has been evaluated through temperature desorption experiments.

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“…Although this material seems promising, it has not yet been developed into a preconcentrator or integrated into a sensor system. 15 …”

Section: Introductionmentioning

confidence: 99%

Nanoporous Silica Preconcentrator for Vapor-Phase DMNB, a Detection Taggant for Explosives

2020

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The detection of trace amounts of explosives in the vapor phase is of great importance. Preconcentration of the analyte is a useful technique to lower the detection limit of existing sensors. A nanoporous silica (pSiO 2 ) substrate was evaluated as a preconcentrator for gas-phase 2,3-dimethyl-2,3-dinitrobutane (DMNB), a volatile detection taggant added by law to plastic explosives. After collection in pSiO 2 , the DMNB vapor was thermally desorbed at 70 °C into a gas chromatography–mass spectrometry sorbent tube. This was analyzed for the total mass of DMNB collected in pSiO 2 . The loading time and loading temperature of pSiO 2 were varied systematically between 15 and 60 min and 5–20 °C, respectively. The preconcentrator’s performance was compared to that of a nonporous substrate of the same material as a control. The collection efficiency of pSiO 2 was calculated as approximately 20% of the total DMNB that passed over it in 30 min, at a concentration of 0.5 ppm in N 2 carrier gas. It had enhancement factors compared to the nonporous substrate of 12 and 16 for 0.5 and 4.1 ppm DMNB, respectively, under the same conditions. No advantage was found with cooling pSiO 2 below room temperature during the loading phase, which removes any need for a cooling system to aid preconcentration. The low desorption temperature of 70 °C is an advantage over other preconcentration systems, although a higher temperature could decrease the desorption time.

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Cavitand-Decorated Silicon Columnar Nanostructures for the Surface Recognition of Volatile Nitroaromatic Compounds

Cited by 6 publications

References 56 publications

Direct Growth on Si(100) of Isolated Octahedral Mil-101(Fe) Crystals for the Separation of Aromatic Vapors

Direct Growth on Si(100) of Isolated Octahedral Mil-101(Fe) Crystals for the Separation of Aromatic Vapors

Heterogeneous growth of continuous ZIF-8 films on low-temperature amorphous silicon

Nanoporous Silica Preconcentrator for Vapor-Phase DMNB, a Detection Taggant for Explosives

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