Iron oxide and oxygen plasma functionalized multi-walled carbon nanotubes for the discrimination of volatile organic compounds

Clément, Pierrick; Hafaiedh, I.; Parra, Enrique J.; Thamri, Atef; Guillot, Jérôme; Abdelghani, Adnane; Llobet, Eduard

doi:10.1016/j.carbon.2014.07.032

Cited by 37 publications

(33 citation statements)

References 43 publications

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“…Macroscopically, these mats behave as mild p‐type semiconductors since their conductance increases or decreases upon adsorption of electron‐accepting or donating molecules, respectively. [19b], Furthermore, according to DFT calculations, the decoration with Au‐NPs slightly perturbs the band structure of MWCNTs causing a small shift of the Fermi level energy toward lower energies, which is equivalent to a p‐doping of the tubes (i.e., there is a small electronic charge transfer from the tube to the Au‐NP) . Finally, since the MWCNT mat consists of defective nanotubes, its resistance is mostly influenced by the resistance of individual nanotubes and not by the internanotube or the electrode–nanotube junctions .…”

Section: Resultsmentioning

confidence: 99%

“…They are particularly sensitive to local chemical environment of the gas phase . The functionalization of CNTs with metal–NPs has been exploited to enhance the sensitivity of the material for benzene sensing, reaching an LOD of about 50 ppb in dry air . The metal–NP–CNT system acts as the transduction unit of the adsorption event in a resistive gas sensor.…”

Section: Introductionmentioning

confidence: 99%

“…However, the decoration of CNTs with metal nanoparticles for improving the device's selectivity has been implemented with limited success because these nanomaterials show similar sensitivity to a variety of aromatic compounds and heating is needed to recover the sensor baseline. [19a]…”

Section: Introductionmentioning

confidence: 99%

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Deep Cavitand Self‐Assembled on Au NPs‐MWCNT as Highly Sensitive Benzene Sensing Interface

Clément

Korom

Struzzi

et al. 2015

Adv Funct Materials

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Keywords: quinoxaline-walled deep cavitand, multi-walled carbon nanotubes, oxygen plasma treatment, gold nanoparticle, benzene.The unprecedented sensitivity and partial selectivity of quinoxaline-walled thioether-legged deep cavitand functionalized multiwall carbon nanotubes toward traces of benzene vapors is presented. The cavitand is grafted onto gold nanoparticle (Au-NP) decorated oxygen plasma treated multiwall carbon nanotubes (O-MWCNT) by a self-assembled monolayer process affording a product referred to as cav-Au-MWCNT. The reported technique is suitable for the mass production of hybrid nanomaterials at low cost. The cav-Au-MWCNT resistive gas sensor operates at room temperature and shows an outstanding performance toward traces of benzene vapors. The detection of 2.5 ppb of benzene in dry air is demonstrated with a limit of detection (LOD) near 600 ppt. For the first time, it is shown that a CNT nanomaterial can effectively sense the extremely harmful benzene molecule with higher sensitivity than toluene or o-xylene at the trace levels. The cavitand is well suited for binding benzene, which, being in close proximity to the MWCNT, affects its density of states (DOS) shifting the Fermi level away from the valence band. The binding of benzene is transduced in a diminution of 2 MWCNT conductance. Furthermore, the inclusion of benzene is fully reversible at room temperature, implying that the sensor can operate at very low power consumption.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deep Cavitand Self‐Assembled on Au NPs‐MWCNT as Highly Sensitive Benzene Sensing Interface

Clément

Korom

Struzzi

et al. 2015

Adv Funct Materials

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“…This heat treatment to regain the sensor baseline was also observed by Mudimela and co-workers when they used vertically aligned carbon nanotubes decorated with sputtered Au nanoparticles to detect nitrogen dioxide [37]. Finally, Clément and co-workers reported the use of an organometallic precursor together with a plasma treatment in order to obtain FeO-decorated multiwalled carbon nanotubes for the roomtemperature detection of aromatic and non-aromatic VOCs [38]. In spite of the fact that metal decoration effectively helps in tuning the gas/vapour response of carbon nanotubes, selectivity remains an important challenge that is still far from being achieved.…”

Section: Introductionmentioning

confidence: 54%

Pt- and Pd-decorated MWCNTs for vapour and gas detection at room temperature

Baccar¹,

Thamri²,

Clément³

et al. 2016

Nano Online

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Here we report on the gas sensing properties of multiwalled carbon nanotubes decorated with sputtered Pt or Pd nanoparticles. Sputtering allows for an oxygen plasma treatment that removes amorphous carbon from the surface of the carbon nanotubes and creates oxygenated surface defects in which metal nanoparticles nucleate within a few minutes. The decoration with the 2 nm Pt or the 3 nm Pd nanoparticles is very homogeneous. This procedure is performed at the device level (i.e., for carbon nanotubes deposited onto sensor substrates) for many devices in one batch, which illustrates the scalability for the mass production of affordable nanosensors. The response to selected aromatic and non-aromatic volatile organic compounds, as well as pollutant gases has been studied. Pt-and Pd-decorated multiwalled carbon nanotubes show a fully reversible response to the non-aromatic volatile organic compounds tested when operated at room temperature. In contrast, these nanomaterials were not responsive to the aromatic compounds studied (measured at concentrations up to 50 ppm). Therefore, these sensors could be useful in a small, battery-operated alarm detector, for example, which is able to discriminate aromatic from non-aromatic volatile organic compounds in ambient.

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“…These tremendous morphologies have given an advantage for a good adsorption [14,15], thus an efficient removal of contaminants. CNTs have been successfully applied to remove numerous contaminants in wastewater such as heavy metals [16,17], volatile organic compound [18] and dye [10,15,19,20].…”

Section: Introductionmentioning

confidence: 99%

Removal of Malachite Green Dye From Aqueous Solution Using Multi-Walled Carbon Nanotubes: An Application of Experimental Design

Zulkepli¹,

Abdullah²,

Khalik³

2016

MJAS

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An experimental design methodology was performed in the optimization of removal of malachite green dye by multi-walled carbon nanotubes. A Central Composite Design (2 5 ) was chosen to develop a mathematical model and determine the optimum condition for adsorption of malachite green by carbon nanotubes. Five experimental factors, namely initial dye concentration, mass of adsorbent, pH, contact time and agitation speed were studied. Maximum adsorption of malachite green was achieved at the suggested optimum conditions: initial dye concentration (20 ppm), weight of adsorbent (0.03 g), pH solution (7) contact time (17 min) and agitation speed (150 strokes per min). The experimental value of adsorption by multi-walled carbon nanotubes were found to be in good agreement with the predicted value (R 2 = 0.922).The experimental equilibrium data were best fitted to isotherm model (Langmuir) and kinetic model (pseudo second-order) respectively. Maximum adsorption by carbon nanotubes at monolayer for malachite green was obtained at 112.36 mg/g while kinetic rate constant was calculated to be 0.0017 g mg -1 min -1 .Keywords: carbon nanotubes, adsorption, malachite green, experimental design Abstrak Metodologi reka bentuk eksperimen telah dijalankan dalam pengoptimuman penyingkiran pewarna malakit hijau oleh karbon tiub nano multi-dinding. Reka bentuk komposit berpusat (2 5 ) telah dipilih untuk membentuk satu model matematik dan menentukan kondisi yang optima untuk penjerapan malakit hijau oleh karbon tiub nano. Lima faktor eksperimen yang terdiri daripada kepekatan awal pewarna, berat bahan penjerap, pH larutan, masa sentuhan dan kelajuan goncangan telah dikaji. Malakit hijau telah mencapai penjerapan yang optima oleh karbon tiub nano pada kondisi: kepekatan awal pewarna (20 ppm), berat bahan penjerap (0.03 g), pH larutan (7), masa sentuhan (17 minit) dan kelajuan goncangan (150 strok/minit). Nilai eksperimen untuk penjerapan oleh karbon tiub nano multi-dinding telah mencapai persetujuan yang baik pada nilai jangkaan (R 2 = 0.922). Data eksprimen keseimbangan menunjukkan kesesuaian pada model Langmuir dan model pseudo tertib kedua. Penjerapan maksimum oleh karbon tiub nano pada monolapisan untuk malakit hijau ialah 112.36 mg/g manakala pemalar kadar kinetik ialah 0.0017 g mg -1 min -1 .Kata kunci: karbon tiub nano, penjerapan, malakit hijau, reka bentuk eksperimen

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Iron oxide and oxygen plasma functionalized multi-walled carbon nanotubes for the discrimination of volatile organic compounds

Cited by 37 publications

References 43 publications

Deep Cavitand Self‐Assembled on Au NPs‐MWCNT as Highly Sensitive Benzene Sensing Interface

Deep Cavitand Self‐Assembled on Au NPs‐MWCNT as Highly Sensitive Benzene Sensing Interface

Pt- and Pd-decorated MWCNTs for vapour and gas detection at room temperature

Removal of Malachite Green Dye From Aqueous Solution Using Multi-Walled Carbon Nanotubes: An Application of Experimental Design

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