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Rosales-Reina B, Cruz-Quesada G, Pujol P, Reinoso S, Elosúa C, Arzamendi G, López-Ramón MV, Garrido JJ. Determination of hazardous vapors from the thermal decomposition of organochlorinated silica xerogels with adsorptive properties. ENVIRONMENTAL RESEARCH 2024; 256:119247. [PMID: 38815719 DOI: 10.1016/j.envres.2024.119247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 05/19/2024] [Accepted: 05/27/2024] [Indexed: 06/01/2024]
Abstract
The incorporation of organic groups into sol-gel silica materials is known to have a noticeable impact on the properties and structure of the resulting xerogels due to the combination of the properties inherent to the organic fragments (functionality and flexibility) with the mechanical and structural stability of the inorganic matrix. However, the reduction of the inorganic content in the materials could be detrimental to their thermal stability properties, limiting the range of their potential applications. Therefore, this work aims to evaluate the thermal stability of hybrid inorganic-organic silica xerogels prepared from mixtures of tetraethoxysilane and organochlorinated triethoxysilane precursors. To this end, a series of four materials with a molar percentage of organochlorinated precursor fixed at 10%, but differing in the type of organic group (chloroalkyls varying in the alkyl-chain length and chlorophenyl), has been selected as model case study. The gases and vapors released during the thermal decomposition of the samples under N2 atmosphere have been analyzed and their components determined and quantified using a thermogravimetric analyzer coupled to a Fourier-transform infrared spectrophotometer and to a gas chromatography-mass spectrometry unit. These analyses have allowed to identify up to three different thermal events for the pyrolysis of the organochlorinated xerogel materials and to elucidate the reaction pathways associated with such processes. These mechanisms have been found to be strongly dependent on the specific nature of the organic group.
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Affiliation(s)
- Beatriz Rosales-Reina
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - Guillermo Cruz-Quesada
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - Pablo Pujol
- Unidad Científico Técnica de Apoyo a La Investigación (UCTAI), Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - Santiago Reinoso
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - César Elosúa
- Institute of Smart Cities (ISC), Departamento de Ingeniería Eléctrica, Electrónica y de Comunicación, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - Gurutze Arzamendi
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
| | - María Victoria López-Ramón
- Departamento de Química Inorgánica y Orgánica, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071, Jaén, Spain.
| | - Julián J Garrido
- Institute for Advanced Materials and Mathematics (INAMAT(2)), Departamento de Ciencias, Universidad Pública de Navarra (UPNA), Campus de Arrosadía, 31006, Pamplona, Spain.
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Souto FT, Machado VG. Hybrid films composed of ethyl(hydroxyethyl)cellulose and silica xerogel functionalized with a fluorogenic chemosensor for the detection of mercury in water. Carbohydr Polym 2023; 304:120480. [PMID: 36641189 DOI: 10.1016/j.carbpol.2022.120480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 12/06/2022] [Accepted: 12/16/2022] [Indexed: 12/24/2022]
Abstract
Ethyl(hydroxyethyl)cellulose (EHEC) and a silica-based xerogel (SBX) were functionalized with a (18-crown-6)-styrylpyridine precursor (1) to obtain the modified polymers EHEC-1 and SBX-1, respectively. Films were obtained and the resulting materials were used as fluorogenic devices for the detection of Hg2+ in water. The films produced from EHEC-1 showed high water retention, making it difficult to apply as a reusable optical chemosensor. Since SBXs are recognized in the literature for their hydrophobicity, a hybrid film composed of EHEC and SBX-1 which did not show water retention was produced and characterized. This system showed rapid response time, outstanding selectivity compared to several other studied metal ions, and sensitivity for the detection of Hg2+ in water. The detection limit for this material using fluorescence technique was 2 ppb (∼10-8 mol L-1). The reversibility of the complex formed between EHEC-SBX-1 film and Hg2+ was demonstrated by the addition of cysteine to the medium. The result obtained also allowed the assembly of INHIBIT and IMPLICATION molecular logic gates, using Hg2+ and cysteine as inputs. The results described in this article have important significance in the development of novel reversible fluorogenic chemosensors and adsorbent materials for the effective removal of Hg2+ ions.
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Affiliation(s)
- Francielly Thaís Souto
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil
| | - Vanderlei Gageiro Machado
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil.
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Cruz-Quesada G, Espinal-Viguri M, López-Ramón MV, Garrido JJ. Novel Organochlorinated Xerogels: From Microporous Materials to Ordered Domains. Polymers (Basel) 2021; 13:polym13091415. [PMID: 33925564 PMCID: PMC8123792 DOI: 10.3390/polym13091415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 04/22/2021] [Accepted: 04/25/2021] [Indexed: 11/25/2022] Open
Abstract
Hybrid silica xerogels combine the properties of organic and inorganic components in the same material, making them highly promising and versatile candidates for multiple applications. They can be tailored for specific purposes through chemical modifications, and the consequent changes in their structures warrant in-depth investigation. We describe the synthesis of three new series of organochlorinated xerogels prepared by co-condensation of tetraethyl orthosilicate (TEOS) and chloroalkyltriethoxysilane (ClRTEOS; R = methyl [M], ethyl [E], or propyl [P]) at different molar ratios. The influence of the precursors on the morphological and textural properties of the xerogels was studied using 29Si NMR (Nuclear Magnetic Resonance), FTIR (Fourier-Transform Infrared Spectroscopy), N2, and CO2 adsorption, XRD (X-ray Diffraction), and FE-SEM (Field-Emission Scanning Electron Microscopy). The structure and morphology of these materials are closely related to the nature and amount of the precursor, and their microporosity increases proportionally to the molar percentage of ClRTEOS. In addition, the influence of the chlorine atom was investigated through comparison with their non-chlorinated analogues (RTEOS, R = M, E, or P) prepared in previous studies. The results showed that a smaller amount of precursor was needed to detect ordered domains (ladders and T8 cages) in the local structure. The possibility of coupling self-organization with tailored porosity opens the way to novel applications for this type of organically modified silicates.
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Affiliation(s)
- Guillermo Cruz-Quesada
- Departamento de Ciencias, Edif. Los Acebos, Campus Arrosadía, Public University of Navarre, 31006 Pamplona, Spain;
- Institute for Advanced Materials and Mathematics, Edif. Jerónimo de Ayanz, Campus Arrosadía, Public University of Navarre, 31006 Pamplona, Spain
| | - Maialen Espinal-Viguri
- Departamento de Ciencias, Edif. Los Acebos, Campus Arrosadía, Public University of Navarre, 31006 Pamplona, Spain;
- Institute for Advanced Materials and Mathematics, Edif. Jerónimo de Ayanz, Campus Arrosadía, Public University of Navarre, 31006 Pamplona, Spain
- Correspondence: (M.E.-V.); (J.J.G.); Tel.: +34-948-169604 (M.E.-V.); +34-948-168082 (J.J.G.)
| | - María Victoria López-Ramón
- Departamento de Química Inorgánica y Orgánica; Facultad de Ciencias Experimentales, University of Jaén, 23071 Jaen, Spain;
| | - Julián J. Garrido
- Departamento de Ciencias, Edif. Los Acebos, Campus Arrosadía, Public University of Navarre, 31006 Pamplona, Spain;
- Institute for Advanced Materials and Mathematics, Edif. Jerónimo de Ayanz, Campus Arrosadía, Public University of Navarre, 31006 Pamplona, Spain
- Correspondence: (M.E.-V.); (J.J.G.); Tel.: +34-948-169604 (M.E.-V.); +34-948-168082 (J.J.G.)
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Surface Functionalization Utilizing Mesoporous Silica Nanoparticles for Enhanced Evanescent-Field Mid-Infrared Waveguide Gas Sensing. COATINGS 2021. [DOI: 10.3390/coatings11020118] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
This work focuses on the development of nanoparticle-based layer-by-layer (LbL) coatings for enhancing the detection sensitivity and selectivity of volatile organic compounds (VOCs) using on-chip mid-infrared (MIR) waveguides (WGs). First, we demonstrate construction of conformal coatings of polymer/mesoporous silica nanoparticles (MSNs) on the surface of Si-based WGs using the LbL technique and evaluate the coating deposition conditions, such as pH and substrate withdrawal speed, on the thickness and homogeneity of the assemblies. We then use the modified WGs to achieve enhanced sensitivity and selectivity of polar organic compounds, such as ethanol, versus non-polar ones, such as methane, in the MIR region. In addition, using density functional theory calculations, we show that such an improvement in sensing performance is achieved due to preferential adsorption of ethanol molecules within MSNs in the vicinity of the WG evanescent field.
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Moriones P, Arzamendi G, Cornejo A, Garrido JJ, Echeverria JC. Comprehensive Kinetics of Hydrolysis of Organotriethoxysilanes by 29Si NMR. J Phys Chem A 2019; 123:10364-10371. [PMID: 31711291 DOI: 10.1021/acs.jpca.9b08910] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The kinetics of several representative hybrid precursors were studied via 29Si NMR: three alkyl precursors, methyltriethoxysilane, ethyltriethoxysilane, and propyltriethoxysilane; as well as two unsaturated radicals, vinyltriethoxysilane and phenyltriethoxysilane. The reaction rate is related to the chemical shift of 29Si in the NMR spectra, which gives information about the electronic density of the Si atoms and the inductive effects of substituents. The concentration of the precursors decreased exponentially with time, and the intermediate products of hydrolysis and the beginning of the condensation reactions showed curves characteristic of sequential reactions, with a similar distribution of the species as a function of the fractional conversion. For all of the precursors, condensation started when the most hydrolyzed species reached a maximum concentration of 0.30 M, when the precursor had run out. A prediction following the developed mathematical model fits the experimental results in line with a common pathway described by eight parameters.
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Azzouz A, Vikrant K, Kim KH, Ballesteros E, Rhadfi T, Malik AK. Advances in colorimetric and optical sensing for gaseous volatile organic compounds. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.06.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Alimagham F, Platkov M, Prestage J, Basov S, Izakson G, Katzir A, Elliott SR, Hutter T. Mid-IR evanescent-field fiber sensor with enhanced sensitivity for volatile organic compounds. RSC Adv 2019; 9:21186-21191. [PMID: 35521343 PMCID: PMC9066189 DOI: 10.1039/c9ra04104d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 06/28/2019] [Indexed: 11/23/2022] Open
Abstract
The increasing awareness of the harsh environmental and health risks associated with air pollution has placed volatile organic compounds (VOCs) sensor technologies in elevated demand. While the currently available VOC-monitoring technologies are either bulky and expensive, or only capable of measuring a total VOC concentration, the selective detection of VOCs in the gas-phase remains a challenge. To overcome this, a novel method and device based on mid-IR evanescent-wave fiber-optic spectroscopy, which enables enhanced detection of VOCs, is hereby proposed. This is achieved by increasing the number of analyte molecules in the proximity of the evanescent field via capillary condensation inside nano-porous microparticles coated on the fiber surface. The nano-porous structure of the coating allows the VOC analytes to rapidly diffuse into the pores and become concentrated at the surface of the fiber, thereby allowing the utilization of highly sensitive evanescent-wave spectroscopy. To ascertain the effectiveness and performance of the sensor, different VOCs are measured, and the enhanced sensitivity is analyzed using a custom-built gas cell. According to the results presented here, our VOC sensor shows a significantly increased sensitivity compared to that of an uncoated fiber. Increased sensitivity of mid-IR evanescent field sensing for gas-phase volatile organic compound detection using a nano-porous coating of an optical-fibre.![]()
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Affiliation(s)
- Farah Alimagham
- Department of Chemistry, University of Cambridge Cambridge CB2 1EW UK
| | - Max Platkov
- Nuclear Research Center Negev Beer-Sheva 84190 Israel
| | | | - Svetlana Basov
- Department of Biomedical Engineering, The Aby and Aladar Fleischman Faculty of Engineering, Tel-Aviv University Tel-Aviv 69987 Israel
| | - Gregory Izakson
- Raymond and Beverly Sackler Faculty of Exact Science, School of Physics and Astronomy, Tel-Aviv University Tel-Aviv 69987 Israel
| | - Abraham Katzir
- Raymond and Beverly Sackler Faculty of Exact Science, School of Physics and Astronomy, Tel-Aviv University Tel-Aviv 69987 Israel
| | - Stephen R Elliott
- Department of Chemistry, University of Cambridge Cambridge CB2 1EW UK
| | - Tanya Hutter
- Department of Chemistry, University of Cambridge Cambridge CB2 1EW UK .,SensorHut Ltd Cambridge CB2 9DN UK
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8
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Dalstein O, Tabo M, Alvarez E, Roux L, Garuz R, Pasquinelli M, Azzi L, Bendahan M, Aguir K, Loizillon J, Abbarchi M, Grosso D. Method To Detect Ethanol Vapor in High Humidity by Direct Reflection on a Xerogel Coating. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4439-4446. [PMID: 30629407 DOI: 10.1021/acsami.8b20479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A simple double thin-film coating-based device is proposed to quantify the ethanol content in humid air featuring a 10 ppm resolution and spanning a dynamic range from 0 to 1000 ppm. The transduction involves the measurement of the direct optical reflection intensity, changing upon refractive index variations induced by water and ethanol adsorption within the coatings. The first thin-film coating is a microporous methyl-functionalized, silica xerogel material more sensitive to alcohol, and the second one is a microporous pure silica xerogel material more sensitive to water. The precision of the sensor is achieved through a mathematical treatment applied on the time resolved adsorption period. Reflection signals of both the ethanol- and water-sensitive coatings are taken into account in the treatment to correct for differences in ambient conditions (temperature, relative humidity, presence of volatile organic compounds) within the same chamber previous to data analysis, which corresponds to realistic operating conditions. As the adsorption mechanism is governed by molecular dynamic equilibrium, these sensors are fast and instantaneously regenerated in ambient air. The sensor is easy to assemble and was reusable for a period exceeding 1 year (maximal tested time).
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Affiliation(s)
- Olivier Dalstein
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Maxime Tabo
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Elsa Alvarez
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Lucas Roux
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Richard Garuz
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Marcel Pasquinelli
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Lhoucine Azzi
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Marc Bendahan
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Khalifa Aguir
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Jérôme Loizillon
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - Marco Abbarchi
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
| | - David Grosso
- Institut Matériaux Microélectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Université, Faculté des Sciences de Saint Jérôme , 13397 Marseille Cedex 20, France
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9
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Recent development of fiber-optic chemical sensors and biosensors: Mechanisms, materials, micro/nano-fabrications and applications. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.08.001] [Citation(s) in RCA: 133] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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10
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Khristenko I, Panteleimonov A, Iliashenko RY, Doroshenko A, Ivanov V, Tkachenko O, Benvenutti E, Kholin YV. Heterogeneous polarity and surface acidity of silica-organic materials with fixed 1-n-propyl-3-methylimidazolium chloride as probed by solvatochromic and fluorescent dyes. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.11.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Echeverría JC, Calleja I, Moriones P, Garrido JJ. Fiber optic sensors based on hybrid phenyl-silica xerogel films to detect n-hexane: determination of the isosteric enthalpy of adsorption. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:475-484. [PMID: 28326238 PMCID: PMC5331324 DOI: 10.3762/bjnano.8.51] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 01/24/2017] [Indexed: 05/31/2023]
Abstract
We investigated the response of three fiber optic sensing elements prepared at pH 10 from phenyltriethoxysilane (PhTEOS) and tetraethylsilane (TEOS) mixtures with 30, 40, and 50% PhTEOS in the silicon precursor mixture. The sensing elements are referred to as Ph30, Ph40 and Ph50, respectively. The films were synthesized by the sol-gel method and affixed to the end of optical fibers by the dip-coating technique. Fourier transform infrared spectroscopy, N2 adsorption-desorption at 77 K and X-ray diffraction analysis were used to characterize the xerogels. At a given pressure of n-hexane, the response of each sensing element decreased with temperature, indicating an exothermic process that confirmed the role of adsorption in the overall performance of the sensing elements. The isosteric adsorption enthalpies were obtained from the calibration curves at different temperatures. The magnitude of the isosteric enthalpy of n-hexane increased with the relative response and reached a plateau that stabilized at approximately -31 kJ mol-1 for Ph40 and Ph50 and at approximately -37 kJ mol-1 for Ph30. This indicates that the adsorbate-adsorbent interaction was dominant at lower relative pressure and condensation of the adsorbate on the mesopores was dominant at higher relative pressure.
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Affiliation(s)
- Jesús C Echeverría
- Institute for Advanced Materials – Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
- Department of Applied Chemistry – Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
| | - Ignacio Calleja
- Institute for Advanced Materials – Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
| | - Paula Moriones
- Institute for Advanced Materials – Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
| | - Julián J Garrido
- Institute for Advanced Materials – Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
- Department of Applied Chemistry – Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain
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12
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Xiao Y, Yu J, Shun L, Tan S, Cai X, Luo Y, Zhang J, Dong H, Lu H, Guan H, Zhong Y, Tang J, Chen Z. Reduced graphene oxide for fiber-optic toluene gas sensing. OPTICS EXPRESS 2016; 24:28290-28302. [PMID: 27958540 DOI: 10.1364/oe.24.028290] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A fiber-optic toluene gas sensor based on reduced graphene oxide (rGO) is demonstrated and its sensing property is investigated experimentally and theoretically. The rGO film is deposited on a side polished fiber (SPF), allowing the strong interaction between rGO film and propagating field and making the SPF sensitive to toluene gas. It is found that the sensor has good linearity and reversibility and can work at room temperature with the response and the recovery time of 256 s and the detection limit of 79 ppm. Moreover, a theoretical model for the sensor is established to analyze the sensing mechanism. Theoretical analysis indicates this type of sensor could work in a wide range of toluene gas concentration and shows that a significant rise in its sensitivity can be expected by adjusting the doping level or chemical potential of graphene.
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13
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Pan GT, Chong S, Yang TCK, Yang YL, Arjun N. Surface Modification of Amorphous SiO2 Nanoparticles by Oxygen-Plasma and Nitrogen-Plasma Treatments. CHEM ENG COMMUN 2016. [DOI: 10.1080/00986445.2016.1230104] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Guan-Ting Pan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan, R.O.C
| | - Siewhui Chong
- Department of Chemical and Environmental Engineering, University of Nottingham, Jalan Broga, Selangor, Malaysia
| | - Thomas C.-K. Yang
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan, R.O.C
| | - Yue-Lin Yang
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan, R.O.C
| | - Nadarajan Arjun
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan, R.O.C
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14
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Youssef IB, Sarry F, Nysten B, Alexieva G, Strashilov V, Kolev I, Alem H. Growth and toxic gas sensing properties of poly(urethaneimide) thin films. Talanta 2016; 153:145-51. [PMID: 27130101 DOI: 10.1016/j.talanta.2016.03.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2015] [Revised: 03/01/2016] [Accepted: 03/05/2016] [Indexed: 11/19/2022]
Abstract
In this work we present a study on the growth and the gas sensing properties of poly(urethane imide) thin films. We first deeply characterized by atomic force microscopy (AFM) the nanostructuration of the poly(urethane imide) holding different amine groups. We further studied the interaction between highly toxic gases such as hexamethyleneimine (HMI) and pyridine and the polymer by using an unconventional method based on Quartz Crystal Microbalance (QCM) measurement. We showed for the first time that weak interactions, i.e. hydrogen bonding between the gas molecules and the polymer film allow the diffusion of the gas molecule deep in the polymeric film and the recovery of the film once the gas molecules leave the sensor. This first work paves a new way for the design of a completely recoverable sensor able to detect highly toxic gases for environmental concern.
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Affiliation(s)
- Ismail Ben Youssef
- Institut Jean Lamour (IJL), UMR CNRS 7198, Université de Lorraine, Parc de Saurupt CS50840, 54011 Nancy, France; Laboratoire de Chimie Physique Macromoléculaire (LCPM), UMR CNRS-INPL 7568, Nancy Université, ENSIC, 1 rue Grandville, BP 20451, 54 001 Nancy Cedex, France
| | - Frederic Sarry
- Institut Jean Lamour (IJL), UMR CNRS 7198, Université de Lorraine, Parc de Saurupt CS50840, 54011 Nancy, France
| | - Bernard Nysten
- Université catholique de Louvain, Institute of Condensed Matter and Nanosciences, Bio & Soft Matter, Croix du Sud 1/L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Gergana Alexieva
- Sofia University, Department of Solid State Physics and Microelectronics, 5 J. Bourchier blvd, 1164 Sofia, Bulgaria
| | - Vesselin Strashilov
- Sofia University, Department of Solid State Physics and Microelectronics, 5 J. Bourchier blvd, 1164 Sofia, Bulgaria
| | - Iliyan Kolev
- Medical University Varna, Department of Pharmaceutical Sciences and Pharmaceutical Management, 9002 Varna, Bulgaria
| | - Halima Alem
- Institut Jean Lamour (IJL), UMR CNRS 7198, Université de Lorraine, Parc de Saurupt CS50840, 54011 Nancy, France.
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Affiliation(s)
- Xu-dong Wang
- Department
of Chemistry, Fudan University, 200433 Shanghai, P. R. China
| | - Otto S. Wolfbeis
- Institute
of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040 Regensburg, Germany
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Arken G, Li G, Zheng X, Liu X. A Novel Electrochemically Deposited Hybrid Film for an Electrogenerated Chemiluminescence Sensor. ANAL LETT 2014. [DOI: 10.1080/00032719.2014.913171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Lu HL, Lu CJ, Tian WC, Sheen HJ. A vapor response mechanism study of surface-modified single-walled carbon nanotubes coated chemiresistors and quartz crystal microbalance sensor arrays. Talanta 2014; 131:467-74. [PMID: 25281128 DOI: 10.1016/j.talanta.2014.08.027] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 08/08/2014] [Accepted: 08/09/2014] [Indexed: 01/29/2023]
Abstract
This paper compares the selectivity and discusses the response mechanisms of various surface-modified, single-walled carbon nanotube (SWCNT)-coated sensor arrays for the detection of volatile organic compounds (VOCs). Two types of sensor platforms, chemiresistor and quartz crystal microbalance (QCM), were used to probe the resistance changes and absorption masses during vapor sensing. Four sensing materials were used in this comparison study: pristine, acidified, esterified, and surfactant (sodium dodecyl sulfate, SDS)-coated SWCNTs. SWCNT-coated QCMs reached the response equilibrium faster than the chemiresistors did, which revealed a delay diffusion behavior at the inter-tube junction. In addition, the calibration lines for QCMs were all linear, but the chemiresistors showed curvature calibration lines which indicated less effectiveness of swelling at high concentrations. While the sorption of vapor molecules caused an increase in the resistance for most SWCNTs due to the swelling, the acidified SWCNTs showed no responses to nonpolar vapors and a negative response to hydrogen bond acceptors. This discovery provided insight into the inter-tube interlocks and conductivity modulation of acidified SWCNTs via a hydrogen bond. The results in this study provide a stepping-stone for further understanding of the mechanisms behind the vapor selectivity of surface-modified SWCNT sensor arrays.
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Affiliation(s)
- Hung-Ling Lu
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Chia-Jung Lu
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan.
| | - Wei-Cheng Tian
- Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
| | - Horn-Jiunn Sheen
- Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan
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