Synthesis of a carboxyl-containing conducting oligomer and non-covalent sidewall functionalization of single-walled carbon nanotubes

Wu, Xiaogang; Shi, Gaoquan

doi:10.1039/b417446a

Cited by 29 publications

(17 citation statements)

References 33 publications

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“…Similar absorption bands are observed for Py-PEGMA oligomers, with the addition of the absorption band at 848 cm −1 that is associated with stretching vibrations of aromatic rings in the pyrene molecule [46]. After the esterification reaction between PEGMA and pyrene butyric acid (see the structures displayed in Fig.…”

Section: Optical Properties Of Py-pegma and Poly(nipaam-co-py-pegma) supporting

confidence: 69%

Mechanochromic response of pyrene functionalized nanocomposite hydrogels

Cellini

Block

et al. 2016

Sensors and Actuators B: Chemical

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a b s t r a c tMechanochromic polymers display detectable changes in their fluorescence emission upon deformation of their macromolecular structure. Here, we study reversible mechanochromism of pyrene functionalized nanocomposite hydrogels. Highly stretchable nanocomposite hydrogels are prepared by free radical polymerization of poly(N-isopropylacrylamide) and pyrene terminated poly(ethylene) glycol methacrylate copolymers in the presence of nanoclay, acting as the physical crosslinker. Mechanochromic behavior is characterized through uniaxial tensile experiments, where force, deformation, and fluorescence emission are simultaneously measured. To demonstrate the application of mechanochromic nanocomposite hydrogels in pressure sensing, membranes are used to detect differential pressures on the order of 10 2 Pa. We envision the integration of these mechanochromic hydrogels in the design of novel force and pressure sensors with application to mechanics, fluid dynamics, and biophysics.

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Section: Optical Properties Of Py-pegma and Poly(nipaam-co-py-pegma) supporting

confidence: 69%

Mechanochromic response of pyrene functionalized nanocomposite hydrogels

Cellini

Block

et al. 2016

Sensors and Actuators B: Chemical

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“…Figure 2(b) shows the UV-vis spectra for raw PBA, m-PBA, pristine CNTs, and m-PBA-CNTs. The spectrum of PBA has characteristic peaks at 266, 275, 327, and 344 nm, which arise from the π π* transitions of pyrene rings [24]. Note that the spectrum of m-PBA shows broad peaks at 276 and 286 nm, which are similar to some of the PBA peaks.…”

Section: Resultsmentioning

confidence: 87%

“…These results show that m-PBA can promote the dispersion of CNTs by attaching to the CNTs. π π interaction between m-PBA and CNTs is one possible reason for the formation of m-PBA-CNTs [17][18][19]24]. Figures 3(a) and 3(b) show the characteristic dispersion states of CNTs in hydrophobic chloroform with (inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhanced electrical properties in carbon nanotube/poly (3-hexylthiophene) nanocomposites formed through non-covalent functionalization

et al. 2011

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Poly(3-hexylthiophene) (P3HT) has received much attention as a good candidate to replace inorganic semiconductors for flexible electronics due to its solution-processability. However, the low charge mobility of P3HT is an obstacle to its commercialization. To overcome this problem, we propose a new non-covalent functionalization method for carbon nanotubes (CNTs) for use in CNT/P3HT nanocomposites. By using modified pyrene molecules with hydrophobic long alkyl chains, the non-covalently functionalized CNTs can become well dispersed in hydrophobic solutions and organic semiconductor matrices. Fabrication of organic thin-film transistors (OTFTs) from the non-covalently functionalized CNT/organic semiconductor nanocomposites shows that our non-covalent functionalization method significantly reduces damage to CNTs during functionalization when compared with covalent functionalization by treatment with acids. The OTFTs show 15 times enhancement of field effect mobility (1.5 × 10 -2 cm 2 /(V·s)) compared to the mobility of OTFTs made from pure P3HT. This enhancement is achieved by addition of only 0.25 wt% of CNTs to P3HT.

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“…Figure 3b indicates the UV‐Vis spectra for PBA, BNNFs, and PBA–BNNFs. The spectrum of PBA has characteristic peaks at 235, 266, 275, 312, 327, and 339 nm, which arise from the π–π* transitions of pyrene rings 39…”

Section: Resultsmentioning

confidence: 99%

Enhanced Mechanical Properties of Epoxy Nanocomposites by Mixing Noncovalently Functionalized Boron Nitride Nanoflakes

Lee

Hwang

Jin

et al. 2013

Small

200

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The influence of surface modifications on the mechanical properties of epoxy-hexagonal boron nitride nanoflake (BNNF) nanocomposites is investigated. Homogeneous distributions of boron nitride nanoflakes in a polymer matrix, preserving intrinsic material properties of boron nitride nanoflakes, is the key to successful composite applications. Here, a method is suggested to obtain noncovalently functionalized BNNFs with 1-pyrenebutyric acid (PBA) molecules and to synthesize epoxy-BNNF nanocomposites with enhanced mechanical properties. The incorporation of noncovalently functionalized BNNFs into epoxy resin yields an elastic modulus of 3.34 GPa, and 71.9 MPa ultimate tensile strength at 0.3 wt%. The toughening enhancement is as high as 107% compared to the value of neat epoxy. The creep strain and the creep compliance of the noncovalently functionalized BNNF nanocomposite is significantly less than the neat epoxy and the nonfunctionalized BNNF nanocomposite. Noncovalent functionalization of BNNFs is effective to increase mechanical properties by strong affinity between the fillers and the matrix.

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Synthesis of a carboxyl-containing conducting oligomer and non-covalent sidewall functionalization of single-walled carbon nanotubes

Cited by 29 publications

References 33 publications

Mechanochromic response of pyrene functionalized nanocomposite hydrogels

Mechanochromic response of pyrene functionalized nanocomposite hydrogels

Enhanced electrical properties in carbon nanotube/poly (3-hexylthiophene) nanocomposites formed through non-covalent functionalization

Enhanced Mechanical Properties of Epoxy Nanocomposites by Mixing Noncovalently Functionalized Boron Nitride Nanoflakes

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