The interaction between the gas sensing and surface morphology properties of LB thin films of porphyrins in terms of the adsorption kinetics

Çapan, İ.; Erdoğan, Matem; Stanciu, George A.; Stanciu, Stefan G.; Hristu, Radu; Göktepe, Mustafa

doi:10.1016/j.matchemphys.2012.08.064

Cited by 10 publications

(6 citation statements)

References 29 publications

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“…In recent years, supramolecular coatings have been applied in the detection of VOCs. Because of their specific “host–guest” interactions, supramolecular coatings increase the sensor specificity and accuracy. − For instance, multiple layers of porphyrin and its derivatives have been deposited on QCM to detect n -propyl alcohol (NPA), chloroform, and toluene; − Calix[ n ]arenes have been used as well for VOCs detections. − However, most of the previous studies are using multiple layers of supramolecules which suffer less specificity and low reversibility due to the gas molecule nonspecific adsorption between the multilayers of supramolecules. Besides, the gas molecule adsorption isotherms and kinetics are less covered in these studies, since it normally requires longer contact time to get stable sensor signals which is partially due to the target molecule noncontrollable diffusion into the receptor multiple layers.…”

Section: Introductionmentioning

confidence: 99%

Detection of Volatile Organic Compounds Using Microfabricated Resonator Array Functionalized with Supramolecular Monolayers

Chang

Tang

et al. 2015

ACS Appl. Mater. Interfaces

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This paper describes the detection of volatile organic compounds (VOCs) using an e-nose type integrated microfabricated sensor array, in which each resonator is coated with different supramolecular monolayers: p-tert-butyl calix[8]arene (Calix[8]arene), 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphine (Porphyrin), β-cyclodextrin (β-CD), and cucurbit[8]uril (CB[8]). Supramolecular monolayers fabricated by Langmuir-Blodgett techniques work as specific sensing interface for different VOCs recognition which increase the sensor selectivity. Microfabricated ultrahigh working frequency film bulk acoustic resonator (FBAR) transducers (4.4 GHz) enable their high sensitivity toward monolayer gas sensing which facilitate the analyses of VOCs adsorption isotherms and kinetics. Two affinity constants (K1, K2) are obtained for each VOC, which indicate the gas molecule adsorption happen inside and outside of the supramolecular cavities. Additional kinetic information on adsorption and desorption rate constants (ka, kd) are obtained as well from exponential fitting results. The five parameters, one from the conventional frequency shift signals of mass transducers and the other four from the indirect analyses of monolayer adsorption behaviors, thus enrich the sensing matrix (Δf, K1, K2, ka, kd) which can be used as multiparameter fingerprint patterns for highly selective detection and discrimination of VOCs.

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Section: Introductionmentioning

confidence: 99%

Detection of Volatile Organic Compounds Using Microfabricated Resonator Array Functionalized with Supramolecular Monolayers

Chang

Tang

et al. 2015

ACS Appl. Mater. Interfaces

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“…The organic vapours are injected into the gas cell and left for 2 min to interact with the sensing layer. The interaction is based on the physical adsorption of the analyte molecules to the sensing layer surface and it is known to be reversible as has been published by many researchers [36][37][38][39]. The inset shows the kinetic response of the hybrid film obtained during two consecutive exposures of saturated vapour of chloroform, which shows clear reproduciblity of sensor response.…”

Section: İnci çApan Et Almentioning

confidence: 90%

Fabrication, characterization and gas sensing properties of gold nanoparticle and calixarene multilayers

2017

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Calixarenes are a group of materials that are widely used for gas sensing studies because of their simple synthesis, conformational flexibility, binding group tunability, variability in their cavity sizes and improved selectivity to different gas molecules. In recent years it has been shown that incorporation of gold nanoparticles (AuNPs) into organic layers further enhances their gas sensing performance. The present study reports on the fabrication of thin films of calixarene and AuNPs using Langmuir-Schaefer (LS) methods. The gas sensing properties of the produced films are investigated on exposure to saturated vapours of volatile organic compounds (VOCs) using surface plasmon resonance as an optical detection technique. Multilayers comprising films of AuNPs and calixarene have been investigated to evaluate the effect of AuNPs on the films sensing performances. It has been demonstrated that the hybrid layers exhibited improved sensing performance in terms of the degree of their response.

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“…Isoprene (2‐methylbutadiene‐1,3) is an organic compound; it is a colorless volatile liquid at room conditions.…”

Section: Methodsmentioning

confidence: 99%

Characterization of innovative sensors for volatile organic compounds trace compounds in biogas

Franchi

Zollo

Pennazza

et al. 2019

Asia-Pacific J Chem Eng

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The production of biogas requires the development of cheap and effective inline monitoring of 11 systems; specifically, pure biogas for specialized applications (solid oxide fuel cells) needs 12 very low concentrations of volatile organic compounds' contaminants. In this work, we report an application of a system, Bionote, already tested at very low concentrations (ppb) for biomedical applications. In details, we applied a gas sensors array of functionalized transducers to the detection of three target analytes (methanol, acetone, and isoprene) to high concentrations of analytes (up to 10,000 ppm). The results were widely satisfactory, because they demonstrate in this range the applicability of the system, which is largely reversible as well. The low cost and very low response times of these sensors stimulate in the direction of their full development and application for online monitoring of biogas in production processes.

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The interaction between the gas sensing and surface morphology properties of LB thin films of porphyrins in terms of the adsorption kinetics

Cited by 10 publications

References 29 publications

Detection of Volatile Organic Compounds Using Microfabricated Resonator Array Functionalized with Supramolecular Monolayers

Detection of Volatile Organic Compounds Using Microfabricated Resonator Array Functionalized with Supramolecular Monolayers

Fabrication, characterization and gas sensing properties of gold nanoparticle and calixarene multilayers

Characterization of innovative sensors for volatile organic compounds trace compounds in biogas

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