Co-TPP functionalized carbon nanotube composites for detection of nitrobenzene and chlorobenzene vapours

Saxena, Shruti; Saini, G. S. S.; Verma, A. L.

doi:10.1007/s12034-015-0864-5

Cited by 9 publications

(7 citation statements)

References 25 publications

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“…More recently, MWCNT was functionalized with CuTPP and CoTPP; , in this case, the MWCNT were first oxidized by corona electrostatic discharge, with the aim of introducing OH groups that can improve the noncovalent functionalization with CoTPP, by grafting the macrocycles. The resulting devices were tested for detection of aromatic hydrocarbons, obtaining good responses, although in some cases affected by long response times.…”

Section: Porphyrinoid-based Chemical Sensors For Gaseous Analytesmentioning

confidence: 99%

Porphyrinoids for Chemical Sensor Applications

et al. 2016

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Porphyrins and related macrocycles have been intensively exploited as sensing materials in chemical sensors, since in these devices they mimic most of their biological functions, such as reversible binding, catalytic activation, and optical changes. Such a magnificent bouquet of properties allows applying porphyrin derivatives to different transducers, ranging from nanogravimetric to optical devices, also enabling the realization of multifunctional chemical sensors, in which multiple transduction mechanisms are applied to the same sensing layer. Potential applications are further expanded through sensor arrays, where cross-selective sensing layers can be applied for the analysis of complex chemical matrices. The possibility of finely tuning the macrocycle properties by synthetic modification of the different components of the porphyrin ring, such as peripheral substituents, molecular skeleton, coordinated metal, allows creating a vast library of porphyrinoid-based sensing layers. From among these, one can select optimal arrays for a particular application. This feature is particularly suitable for sensor array applications, where cross-selective receptors are required. This Review briefly describes chemical sensor principles. The main part of the Review is divided into two sections, describing the porphyrin-based devices devoted to the detection of gaseous or liquid samples, according to the corresponding transduction mechanism. Although most devices are based on porphyrin derivatives, seminal examples of the application of corroles or other porphyrin analogues are evidenced in dedicated sections.

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Section: Porphyrinoid-based Chemical Sensors For Gaseous Analytesmentioning

confidence: 99%

Porphyrinoids for Chemical Sensor Applications

et al. 2016

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“…Sensitivities in the 4.10 –4 –6.10 –4 %/ppm range recorded for CNTs/CuPctBu submitted to xylene in our case are higher than sensitivity values recorded for CNTs composites using the same resistive transduction. However, they are lower than sensitivities recorded with CNTs-functionalized metalloporphyrins using a FET (field effect transistor) transduction . It is worth noting that using such FET transduction, the functionalized CNTs are more sensitive to toluene than xylene and benzene.…”

Section: Results and Discussionmentioning

confidence: 93%

“…Sensitivity to benzene (in the 1.10 −4 −3.10 −5 %/ppm range) in our CNTs/ MCs is of course lower (Figure 8) than those of xylene. For comparison, CNTs functionalized with porphyrins and metalloporphyrins using a FET (field effect transistor) transduction 11,46 present a higher sensitivity to benzene compared to our resistive sensors. A real comparison is difficult to achieve since the FET transduction appears to be more sensitive than the resistive one.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

“…However, they are lower than sensitivities recorded with CNTs-functionalized metalloporphyrins using a FET (field effect transistor) transduction. 46 It is worth noting that using such FET transduction, the functionalized CNTs are more sensitive to toluene than xylene and benzene. Sensitivity to benzene (in the 1.10 −4 −3.10 −5 %/ppm range) in our CNTs/ MCs is of course lower (Figure 8) than those of xylene.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Functionalized CNTs-Based Gas Sensors for BTX-Type Gases: How Functional Peripheral Groups Can Affect the Time Response through Surface Reactivity

et al. 2018

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Herein we present gas sensor responses of functionalized carbon nanotubes (CNTs) toward benzene and xylene vapors. The functional moieties are phthalocyanine and porphyrin derivatives which possess a central part delimited by the macroring and different peripheral groups (aryl or alkyls) surrounding the macroring. The sensor devices based on QCM (quartz crystal microbalance) and resistive transducers are performed simultaneously to elucidate the sensing mechanism. The sensing performance from the two transducers recorded at room temperature revealed different behavior but complementary to understand the mechanism. Our findings show that if the aromatic VOCs bear methyl groups (xylene), the desorption profile is slow and the response time too long, while in the absence of a methyl group (benzene) the desorption profile is very rapid with a shorter response time. This illustrates that the whole gas response is driven by an interplay between the π−π interaction and the π−alkyl or alkyl−alkyl interactions, i.e., van der Waals (VdW) interactions. The analysis of the adsorption−desorption profile shows that the interaction mechanism is based on a synergy between many interactions that proceed collectively or separately to strengthen or weaken the gas−material interaction. Thus, the presence of alkyl groups on both sides (VOCs and functional moieties) inherently contributes to define the gas material interaction.

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“…For this reason, organic molecules with extended aromatic system, e.g. pyrene, [14][15][16][17] porphyrin [18][19][20][21][22][23] and phthalocyanine [24][25][26][27][28][29] derivatives, are widely used for the modification of carbon nanomaterials due to their ability to form specific and π-π-stacking contacts between aromatic molecules and the graphite surface of CNT. Noncovalent functionalization of carbon nanotubes leads also to an increase of CNT solubility [30] and improvement of photoinduced electron transfer properties, [15,24,31] sensing properties, [17,[32][33][34][35] mechanical and thermal properties, [16,[36][37][38][39] and catalytic effect.…”

Section: Noncovalent Functionalizationmentioning

confidence: 99%

Hybrid Materials Based on Carbon Nanotubes and Polyaromatic Molecules: Methods of Functionalization and Sensor Properties

Basova¹,

Polyakov²

2020

MHC

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One of the most relevant ways to improve selectivity of sensors based on carbon nanotubes (CNT) is to create hybrid materials with polyaromatic molecules. The interest in hybrid materials is related to the synergistic effect that occurs when the properties of carbon nanomaterials (their one-dimensional electronic structure, high conductivity, large surface area) and properties of polyaromatic molecules (high sensitivity to analytes of different nature, reversibility of the sensor response) are combined. The creation of new porous three-dimensional carbon structures, in which polyaromatic molecules are linkers, is also of interest for creating functional carbon materials of a new generation. This review analyzes the current state of research in the field of hybrid materials based on carbon nanotubes and various polyaromatic molecules (derivatives of phthalocyanine, porphyrin, pyrene, coumarin, BODIPY, etc.) related to the problems of improving the sensitivity and selectivity of chemiresistive and electrochemical sensors. The first part of the review presents an analysis of works that describe various methods of functionalization of carbon nanotubes with aromatic molecules, and examines their influence on the composition and structure of the resulting materials, as well as approaches to creating hybrid 3D structures based on CNTs. The second part of the review is devoted to the functional properties of hybrid materials with the main focus on the analysis of their sensor properties. Examples of the most successful application of hybrid materials as active layers of chemiresistive sensors for determining various gases in the environment are given. When considering the literature data, the main attention is paid to the analysis of the influence of methods of CNT functionalization with polyaromatic molecules on sensor properties. The third part of the review is devoted to the use of hybrid materials for the modification of electrodes of electrochemical sensors for the determination of various molecules in aqueous solutions and biological media.

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Co-TPP functionalized carbon nanotube composites for detection of nitrobenzene and chlorobenzene vapours

Cited by 9 publications

References 25 publications

Porphyrinoids for Chemical Sensor Applications

Porphyrinoids for Chemical Sensor Applications

Functionalized CNTs-Based Gas Sensors for BTX-Type Gases: How Functional Peripheral Groups Can Affect the Time Response through Surface Reactivity

Hybrid Materials Based on Carbon Nanotubes and Polyaromatic Molecules: Methods of Functionalization and Sensor Properties

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