Preparation of nanosensors based on organic functionalized MWCNT for H2S detection

Mohammadzadeh, Fatemeh; Jahanshahi, Mohsen; Rashidi, Alimorad

doi:10.1016/j.apsusc.2012.07.011

Cited by 33 publications

(16 citation statements)

References 39 publications

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“…In order to explore the effect of the linking molecules, the I-V characteristics of the cPcCo-B-aCNT sensors with the same mass loading on IDEs were investigated (Fig. 64 Relative to HQ, the linking molecules PAP and PPD containing -NH groups can provide more electrons to combine with the holes in p-type semiconductors of cPcCo and aCNTs. The linearity and symmetry of I-V curves suggest an ohmic contact between the samples and gold electrodes.…”

Section: H 2 S Sensing Mechanism Of the Cpcco-b-acnt Sensorsmentioning

confidence: 99%

Stably dispersed carbon nanotubes covalently bonded to phthalocyanine cobalt(ii) for ppb-level H₂S sensing at room temperature

Chen

Zhang

et al. 2016

J. Mater. Chem. A

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Cost-efficient, highly sensitive and stable sensing materials play a key role in developing H 2 S sensors.Herein, tetra-b-carboxyphenyloxyphthalocyanine cobalt(II) (cPcCo) has been successfully bonded on the surface of acidified multiwalled carbon nanotubes (aCNTs) by a facile two-step condensation reaction in the presence of N,N 0 -dicyclohexylcarbodiimide (DCC), using hydroquinone (HQ), p-aminophenol (PAP), and p-phenylenediamine (PPD) as linking molecules, respectively. The obtained cPcCo-B-aCNT (B¼ HQ, PAP, and PPD) hybrids display good dispersibility in ethanol, which is beneficial to construct uniform sensing devices. The cPcCo-B-aCNT sensors, with a loose network-like structure, present abundant exposed sensing sites, oriented transmission of charges, and unimpeded pathways for H 2 S diffusion, which endow the cPcCo-B-aCNT hybrids with excellent sensing performance, in terms of sensitivity, reliability, reproducibility, and detection limit. The detection limit of the sensors composed of cPcCo-B-aCNT hybrids towards H 2 S reaches the ppb-level at room temperature, which is about the same as the odor threshold level for humans. For the cPcCo-HQ-aCNT sensor, the response to H 2 S varies linearly with respect to its concentration from 20 to 160 ppb and from 320 to 2560 ppb, with the highest gas response of 2.5% to 80 ppb H 2 S and a low detection limit of 5 ppb. Furthermore, the linking molecules play a critical role in the sensitivity of H 2 S, as evidenced from the current-voltage characteristics. The systematic study developed here provides a valid way to fabricate other high-efficient H 2 S sensors.Scheme 1 A schematic illustration of the synthesis procedure for cPcCo-B-aCNT hybrids. J. Mater. Chem. A This journal is Fig. 5 Cross-sensitivities to various gases for the aCNT sensor (A) and cPcCo-HQ-aCNT sensor (B) at room temperature; MeOH ¼ methanol, EtOH ¼ ethanol, DMK ¼ acetone, DCM ¼ dichloromethane, TCM ¼ trichloromethane, CTC ¼ carbon tetrachloride, PhH ¼ benzene, Tol ¼ toluene, THF ¼ tetrahydrofuran, MA ¼ methyl aldehyde, AA ¼ acetic acid, DEE ¼ diethyl ether, and EA ¼ ethyl acetate. J. Mater. Chem. A This journal is

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Section: H 2 S Sensing Mechanism Of the Cpcco-b-acnt Sensorsmentioning

confidence: 99%

Stably dispersed carbon nanotubes covalently bonded to phthalocyanine cobalt(ii) for ppb-level H₂S sensing at room temperature

Chen

Zhang

et al. 2016

J. Mater. Chem. A

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“…1-3 Therefore, MWCNTs have been used in many fields, including solar cells, absorbents, chemical and biological sensors, and drug-delivery systems. 8 As we know, H 2 S is a toxic, corrosive, and inflammable gas generated in sewage, coal mines, and the oil and natural gas industries, and it is used in many chemical industries. MWCNTs can be functionalized by various chemical reagents and via different functionalization methods.…”

Section: Introductionmentioning

confidence: 99%

“…For example, MWCNTs were successfully and rapidly functionalized by microwave radiation, 7 and the effects of various organic functional groups on the electrical responses of MWCNT sensors for hydrogen sulfide (H 2 S) detection were also investigated. 8 As we know, H 2 S is a toxic, corrosive, and inflammable gas generated in sewage, coal mines, and the oil and natural gas industries, and it is used in many chemical industries. H 2 S can damage gasprocessing facilities and transportation equipment.…”

Section: Introductionmentioning

confidence: 99%

Polyethylenimine‐functionalized multiwalled carbon nanotube for the adsorption of hydrogen sulfide

Chu

Tang

et al. 2017

J of Applied Polymer Sci

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Functionalized multiwalled carbon nanotubes (MWCNTs) were synthesized with ethane diamine and polyethylenimine (PEI) with molecular weights of 1800 [MWCNT-PEI weight-average molecular weight (M w ) 5 1800] and 70,000 (MWCNT-PEI M w 5 70,000), respectively. The structures and properties of the ethane diamine functionalized MWCNTs and PEI-functionalized MWCNTs were characterized by Raman spectroscopy, thermogravimetric analysis, X-ray powder diffraction, and scanning electron microscopy. An increase with the D/G (D, Disorder band; G, Graphite) ratio of the functionalized MWCNTs in the Raman spectra proved that the ethane diamine and PEI were successfully bonded to the surface of the pristine MWCNTs. The results of TGA also confirmed this. In addition, the structure of the functionalized MWCNTs showed no significant changes compared with the pristine MWCNTs; this was confirmed by X-ray powder diffraction. Hydrogen sulfide (H 2 S) sorption on the functionalized MWCNTs was studied by UV spectroscopy. As expected, the results of UV spectroscopy shows that the MWCNTs bonded with higher molecular weight PEI had a more excellent H 2 S adsorption efficiency than those bonded with low-molecular-weight PEI and ethane diamine, a micromolecular amine. The effects of the pH and temperature on the adsorption of H 2 S were also studied. Under the conditions investigated, the maximum first-time H 2 S adsorption efficiency of 1.94 mmol/g was observed for MWCNT-PEI (M w 5 70,000) in the 60 mg/L sodium hydrosulfide (NaHS) aqueous solution. In addition, the H 2 S reversible adsorption of the functionalized MWCNTs was conducted, and the second-time H 2 S adsorption efficiency of MWCNT-PEI (M w 5 70,000) reached 1.83 mmol/g in the 60 mg/L NaHS aqueous solution. The results demonstrate that the MWCNTs decorated with high-molecularweight PEI were potentially excellent and reversible H 2 S adsorbents.

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“…Polybenzimidazole modified MWCNTs were regarded as a conductive supporting material for fuel cell catalyst . MWCNTs have been regarded as superior adsorbents for the removal of harmful and toxic pollutants from gas and aqueous solution . He et al grafted β‐cyclodextrin onto MWCNTs and found they had good adsorption of Cr (VI) and phenol, which fitted the Langmuir isotherm model.…”

Section: Introductionmentioning

confidence: 99%

Preparation of novel high copper ions removal membranes by embedding organosilane-functionalized multi-walled carbon nanotube

Zeng

Yang

et al. 2015

J. Chem. Technol. Biotechnol.

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BACKGROUND Multi‐walled carbon nanotubes (MWCNTs) have attracted considerable interest in the membrane field, but they are prone to aggregate in the polymer matrix and cause membrane defects. Different from blending MWCNTs in the casting solution, different ratios of APTS‐functionalized MWCNTs (A‐MWCNTs) were embedded on the surface of polyvinylidene fluoride (PVDF) membranes. RESULTS FTIR and XPS demonstrated the reaction between MWCNTs and APTS. SEM and AFM images showed that new morphology and pore structure appeared in novel A‐MWCNTs/PVDF membranes compared with pure PVDF membrane. The embedding was firm because of APTS chains penetrating into the PVDF matrix, and the optimum content of A‐MWCNTs was 0.05 wt%. Besides, A‐MWCNTs/PVDF membranes exhibited superior contact angle and BSA rejection than PVDF membrane. In the tests of copper ions rejection and adsorption, 0.05 wt% A‐MWCNTs/PVDF membrane gave 89.1% removal and 2.067 mg g−1 adsorption capacity compared with PVDF membrane, at just 19.66% and 0.516 mg g−1, respectively. CONCLUSIONS The existence of functional groups in A‐MWCNTs such as –NH2 and –COOH, can not only increase the hydrophilicity of membranes, but also provide more adsorption sites to have a complexation reaction with Cu2+ ions. This work provides information to solve practical problems in the field of wastewater treatment. © 2015 Society of Chemical Industry

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Preparation of nanosensors based on organic functionalized MWCNT for H2S detection

Cited by 33 publications

References 39 publications

Stably dispersed carbon nanotubes covalently bonded to phthalocyanine cobalt(ii) for ppb-level H₂S sensing at room temperature

Stably dispersed carbon nanotubes covalently bonded to phthalocyanine cobalt(ii) for ppb-level H₂S sensing at room temperature

Polyethylenimine‐functionalized multiwalled carbon nanotube for the adsorption of hydrogen sulfide

Preparation of novel high copper ions removal membranes by embedding organosilane-functionalized multi-walled carbon nanotube

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Preparation of nanosensors based on organic functionalized MWCNT for H2S detection

Cited by 33 publications

References 39 publications

Stably dispersed carbon nanotubes covalently bonded to phthalocyanine cobalt(ii) for ppb-level H2S sensing at room temperature

Stably dispersed carbon nanotubes covalently bonded to phthalocyanine cobalt(ii) for ppb-level H2S sensing at room temperature

Polyethylenimine‐functionalized multiwalled carbon nanotube for the adsorption of hydrogen sulfide

Preparation of novel high copper ions removal membranes by embedding organosilane-functionalized multi-walled carbon nanotube

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Stably dispersed carbon nanotubes covalently bonded to phthalocyanine cobalt(ii) for ppb-level H₂S sensing at room temperature

Stably dispersed carbon nanotubes covalently bonded to phthalocyanine cobalt(ii) for ppb-level H₂S sensing at room temperature