Surface covalent encapsulation of multiwalled carbon nanotubes with poly(acryloyl chloride) grafted poly(ethylene glycol)

Liu, Yanxin; Du, Zhongjie; Li, Yan; Zhang, Chen; Li, Congju; Yang, Xiaoping; Li, Hangquan

doi:10.1002/pola.21748

Cited by 45 publications

(40 citation statements)

References 32 publications

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“…We observed the p-p stacking of C atoms at 288.9 eV. 19,20 Moreover, the characteristic C-O and C-C binding energy peaks of the Py-PES polymer also appeared at 286.0 eV and 284.5 eV, respectively.…”

mentioning

confidence: 77%

Extremely fast and highly selective detection of nitroaromatic explosive vapours using fluorescent polymer thin films

2013

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A novel sensing material based on pyrene doped polyethersulfone worm-like structured thin film is developed using a facile technique for detection of nitroaromatic explosive vapours. The formation of p-p stacking in the thin fluorescent film allows a highly sensitive fluorescence quenching which is detectable by the naked eye in a response time of a few seconds.Nitroaromatic (NA) explosives are the primary constituents of many unexploded land mines worldwide.1,2 Selective, fast and low-cost detection of NA explosives, such as trinitrotoluene (TNT) and dinitrotoluene (DNT), is crucial for military operations, homeland security, and environmental safety. 3 Various analytical and spectroscopic methods have been developed for sensitive detection of NA compounds. [4][5][6][7] These instrumental techniques are mostly expensive and not portable for use in the field. The detection of NA explosives using fluorescent-based sensors has been extensively studied because of their sensitivity, portability, and short response time. [8][9][10][11][12][13] The most important report in this field was published by Swager' group. 14 They used a conjugated polymer scaffold and improved the detection sensitivity. 14 Trogler and co-workers developed a new class of fluorescent films which were fabricated by spin-coating onto suitable solid substrates for detecting NA explosives both in the air and organic solvents. 15 The underlying explosive detection mechanism of the fluorescent polymer is photo-induced electron transfer (PET) from the polymers to the NA explosives. The key feature of this phenomenon is the presence of the p-p-stacking (excimer) between the polymer chains and chromophore groups.This p-stacked formation can significantly enhance the sensing performance of films.14,15In this report, we have fabricated a novel fluorescent thin film based on the pyrene-doped polyethersulfone (Py-PES) polymer for detection of nitro-explosive vapours using a rapid and facile method. The experimental details of the preparation of this sensing film are given in ESI. † To prepare the fluorescent polymer, we chose pyrene (Py) as the fluorescent dye because of its potential to form highly emissive excited dimers, high fluorescence yield, and known fluorescence quenching sensitivity to NA compounds. 16 The driving force for the quenching mechanism of Py-PES thin films is the formation of p-p Scheme 1 Schematic representation of the quenching mechanism for the Py-PES film by TNT based on photo-electron transfer (PET) process. The main driving force for the PET process is the energy gap between the conduction band of Py-PES films and the LUMO of NA explosives. NA explosives accept the electron from exited state of pyrene due to their low LUMO energies and as a result the fluorescent film is quenched 18 (see details in ESI †).a UNAM-National Nanotechnology Research Center, Bilkent University, 06800 Ankara, Turkey. E-mail: birlik@unam.bilkent.edu.tr b Department of Chemistry, Gazi University, Polatli, 06900, Ankara, Turkey c Institute of Materials Sc...

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confidence: 77%

Extremely fast and highly selective detection of nitroaromatic explosive vapours using fluorescent polymer thin films

2013

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“…[26][27][28] Covalent attachment of polymer chains to the MWNT surface can be performed by ''grafting from'' [26,[28][29][30] and ''grafting to'' [31,32] approaches. Zhao et al reported polystyrene grafted MWNTs (MWNT-PSs) and polystyrene-blockpoly(4-vinylpyridine) grafted MWNTs (MWNT-PS-bP4VPs) via nitroxide-mediated radical polymerization (NMRP).…”

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confidence: 99%

Modification and Grafting of Multi‐Walled Carbon Nanotubes with Bisphenol‐A‐polycarbonate

Mörmann

Yong

Zou

et al. 2008

Macro Chemistry & Physics

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Multi‐walled carbon nanotubes (MWNT) were oxidized with nitric acid and resulting carboxy groups were transformed to amino groups with a diamine under microwave irradiation. Grafting of bisphenol‐A‐polycarbonate onto carboxy‐ and amino‐functional MWNT through transesterification or aminolysis resulted in weight increase up to 300%. The morphology of functionalized and grafted MWNTs was investigated with scanning force microscopy (SFM) and transmission electron microscopy (TEM). Depending on the type of functionalisation and the extent of grafting different morphologies were observed. Aminofunctional MWNT‐g‐PCs showed more “ball‐like” or irregular protrusions of grafted PC. Carboxyfunctional MWNT‐g‐PCs were more smoothly covered with PC.

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“…Therefore, the noncovalent absorption was not ready to occur. [20] It should be pointed out that the downturn of the baseline going to lower wavenumber is typical for carbon nanotubes, due to their unique electronic structure.…”

Section: Synthesis Of Ams-containing Copolymer-grafted Mwcntsmentioning

confidence: 99%

Functionalization of Multi‐Walled Carbon Nanotubes by Thermo‐Grafting with α‐Methylstyrene‐Containing Copolymers

Jiang

Deng

Yang

2008

Macromol. Rapid Commun.

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The present article reports on a strategy for the functionalization of multi‐walled carbon nanotubes (MWCNTs) by grafting with various polymer chains. Copolymers consisting of α‐methylstyrene (AMS) and a second monomer, that is glycidyl methacrylate (GMA) or styrene (St), were synthesized in advance. The copolymers were heated in the presence of MWCNTs in solution, decomposition of the AMS sequences occurred, providing macroradicals, which further attacked the double bonds on the MWCNT surfaces. Grafting of the copolymer chains onto the surface of the MWCNTs was thus achieved, as demonstrated by FT‐IR, XPS and Raman technologies. The resulting poly(AMS‐co‐GMA)‐g‐MWCNTs could be uniformly dispersed in N,N‐dimethylformamide (DMF) and acetone, and the poly(AMS‐co‐St)‐g‐MWCNTs also could be uniformly dispersed in DMF.magnified image

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Surface covalent encapsulation of multiwalled carbon nanotubes with poly(acryloyl chloride) grafted poly(ethylene glycol)

Cited by 45 publications

References 32 publications

Extremely fast and highly selective detection of nitroaromatic explosive vapours using fluorescent polymer thin films

Extremely fast and highly selective detection of nitroaromatic explosive vapours using fluorescent polymer thin films

Modification and Grafting of Multi‐Walled Carbon Nanotubes with Bisphenol‐A‐polycarbonate

Functionalization of Multi‐Walled Carbon Nanotubes by Thermo‐Grafting with α‐Methylstyrene‐Containing Copolymers

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