Dispersions Based on Carbon Nanotubes – Biomolecules Conjugates

Capek, Ignác

doi:10.5772/18583

Cited by 2 publications

(3 citation statements)

References 96 publications

(120 reference statements)

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“…The relative intensity of G − to G + band was reduced 9% relative to bare SWNTs [37]. The G + and G − bands can be predominantly ascribed to the vibrations of carbon atoms along the axis and the circumferential direction of the SWNT, respectively [38].…”

Section: Resultsmentioning

confidence: 99%

Gas Biosensor Arrays Based on Single-Stranded DNA-Functionalized Single-Walled Carbon Nanotubes for the Detection of Volatile Organic Compound Biomarkers Released by Huanglongbing Disease-Infected Citrus Trees

Wang

Ramnani

Pham

et al. 2019

Sensors

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Volatile organic compounds (VOCs) released by plants are closely associated with plant metabolism and can serve as biomarkers for disease diagnosis. Huanglongbing (HLB), also known as citrus greening or yellow shoot disease, is a lethal threat to the multi-billion-dollar citrus industry. Early detection of HLB is vital for removal of susceptible citrus trees and containment of the disease. Gas sensors are applied to monitor the air quality or toxic gases owing to their low-cost fabrication, smooth operation, and possible miniaturization. Here, we report on the development, characterization, and application of electrical biosensor arrays based on single-walled carbon nanotubes (SWNTs) decorated with single-stranded DNA (ssDNA) for the detection of four VOCs—ethylhexanol, linalool, tetradecene, and phenylacetaldehyde—that serve as secondary biomarkers for detection of infected citrus trees during the asymptomatic stage. SWNTs were noncovalently functionalized with ssDNA using π–π interaction between the nucleotide and sidewall of SWNTs. The resulting ssDNA-SWNT hybrid structure and device properties were investigated using Raman spectroscopy, ultraviolet (UV) spectroscopy, and electrical measurements. To monitor changes in the four VOCs, gas biosensor arrays consisting of bare SWNTs before and after being decorated with different ssDNA were employed to determine the different concentrations of the four VOCs. The data was processed using principal component analysis (PCA) and neural net fitting (NNF).

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Section: Resultsmentioning

confidence: 99%

Gas Biosensor Arrays Based on Single-Stranded DNA-Functionalized Single-Walled Carbon Nanotubes for the Detection of Volatile Organic Compound Biomarkers Released by Huanglongbing Disease-Infected Citrus Trees

Wang

Ramnani

Pham

et al. 2019

Sensors

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“…Both covalent and noncovalent modifications of the MWCNT surface are used . [9][10][11][12][13] Work elsewhere has shown that covalent modifications method can disperse MWCNTs. 9,10 The drawback to covalent modification is the need to generate functional groups (carboxyl, hydroxyl, and carbonyl groups) on the surface of MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

“…14,15 These functional will cause defects and destroy the conjugated π networks of the CNTs, which in turn leads to the deterioration of their conductivity and mechanical properties. 13 On the other hand, noncovalent approaches use intermolecular forces to modify CNTs, and, since they leave the carbon skeleton untouched, there is no secondary damage to the surface of MWCNTs so that the conductivities and mechanical properties are retained. 11,12 Materials with large conjugated moieties are good candidates to modify MWCNTs through the interactions of pi orbitals between the conjugated structures and the sidewalls of MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

A series of novel high‐temperature‐resistant multiwall carbon nanotubes dispersants: Polyphenylene sulfones with pyrene groups in main chain

Seery

Gao

et al. 2019

J of Applied Polymer Sci

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A series of polyphenylene sulfones were synthesized with pyrene groups in the main chain. Using a traditional Suzuki coupling reaction followed by a reduction, the pyrene-containing monomer was synthesized as the diphenol. A series of copolymers were synthesized using this new monomer, a biphenyldiphenol, and 4,4 0 -difluorodiphenylsulfone. These polymers were characterized using 1 HNMR and FTIR spectroscopy. The introduction of rigid pyrene groups provided these new polymers with good thermal stability and mechanical strength. In this work, these polymers are shown to functionalize and disperse multiwall carbon nanotubes (MWCNTs). The associations of our copolymers to the MWCNTs appear to operate through pi stacking interactions between the pyrene group and the sidewalls of the MWCNTs, referred to in this article as f-MWCNTs. The dispersibility of f-MWCNTs in solvents and polymer matrixes was systematically studied by preparation of f-MWCNTs/polyphenylene sulfone (PPSU) composites with various f-MWCNTs content. Improvements in the dispersability of f-MWCNTs in PPSU resin result in enhancement of the mechanical and thermal properties of f-MWCNTs/PPSU composites.In this study, polymeric dispersing agents are preferred to small molecule dispersants for modifying the MWCNTs by the noncovalent associations. Polymeric dispersants can provide multiple associations Additional Supporting Information may be found in the online version of this article.

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Dispersions Based on Carbon Nanotubes – Biomolecules Conjugates

Cited by 2 publications

References 96 publications

Gas Biosensor Arrays Based on Single-Stranded DNA-Functionalized Single-Walled Carbon Nanotubes for the Detection of Volatile Organic Compound Biomarkers Released by Huanglongbing Disease-Infected Citrus Trees

Gas Biosensor Arrays Based on Single-Stranded DNA-Functionalized Single-Walled Carbon Nanotubes for the Detection of Volatile Organic Compound Biomarkers Released by Huanglongbing Disease-Infected Citrus Trees

A series of novel high‐temperature‐resistant multiwall carbon nanotubes dispersants: Polyphenylene sulfones with pyrene groups in main chain

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