Electrooxidative para-selective C–H/N–H cross-coupling with hydrogen evolution to synthesize triarylamine derivatives

Liu, Kun; Tang, Shan; Wu, Ting; Wang, Shengchun; Zou, Minzhu; Cong, Hengjiang; Lei, Aiwen

doi:10.1038/s41467-019-08414-8

Cited by 151 publications

(90 citation statements)

References 68 publications

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“…presence of metallic species challenges the implementation of SWNT in the fabrication of electronic devices. [9,10] In order to effectively use SWNTs in electronic applications, besides improvements in the synthetic methods, different postgrowth methods to separate metallic and semiconducting tubes have been developed in the last years, including dielectrophoresis, [11] density gradient centrifugation, [12] size exclusion chromatography, [13] and polymer wrapping. [14] The polymer wapping technique has attracted considerable attention, due to its high selectivity toward semiconducting nanotubes, widespread availability of conjugated polymers, and the simplicity and reproducibility of the process.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Selection Mechanism of the Polymer Wrapping Technique toward Semiconducting Carbon Nanotubes

et al. 2018

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Noncovalent functionalization of single‐walled carbon nanotubes (SWNTs) using π‐conjugated polymers has become one of the most effective techniques to select semiconducting SWNTs (s‐SWNTs). Several conjugated polymers are used, but their ability to sort metallic and semiconducting species, as well as the dispersions yields, varies as a function of their chemical structure. Here, three polymers are compared, namely, poly[2,6‐(4,4‐bis‐(2‐dodecyl)‐4H‐cyclopenta[2,1‐b;3,4b′]dithiophene)‐alt‐4,7(2,1,3‐benzothiadiazole)] (P12CPDTBT), poly(9,9‐di‐n‐dodecylfluorenyl‐2,7‐diyl) (PF12), and poly(3‐dodecylthiophene‐2,5‐diyl) (P3DDT) in their ability to select two types of carbon nanotubes comprising small (≈1 nm) and large (≈1.5 nm) diameters. P12CPDTBT is a better dispersant than PF12 for small diameter nanotubes, while both polymers are good dispersants of large diameter nanotubes. However, these dispersions contain metallic species. P3DDT, instead presents the best overall performance regarding the selectivity toward semiconducting species, with a dispersion yield for s‐SWNTs of 15% for small and 21% for large diameter nanotubes. These results are rationalized in terms of electronic and chemical structure showing that: (i) the binding energy is stronger when more alkyl lateral chains adsorb on the nanotube surface; (ii) the binding energy is stronger when the polymer backbone is more flexible; (iii) the purity of the dispersions seems to depend on a strong polymer–nanotube interaction.

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Section: Introductionmentioning

confidence: 99%

Understanding the Selection Mechanism of the Polymer Wrapping Technique toward Semiconducting Carbon Nanotubes

et al. 2018

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“…13 SPM particles could be electrically charged due to the rapid collision of particles in the air, and when the electrically charged SPM particles were close to the mats, electrostatic adsorption occurred. 29 After exhaling, it was clear that the SPM particles on the surface of the Ag NCs/CS/PVA nanofiber mats disappeared [ Figure 7(f-h) and Figure S9(b)]. It might be said that the exhaled air acted as a cleaner that led the SPM particles away from the surface of the mats and resulted in the self-cleaning of the mats.…”

Section: Resultsmentioning

confidence: 99%

Ultrasmall Ag nanocrystals supported on chitosan/PVA nanofiber mats with bifunctional properties

Wang

Wei

et al. 2018

J of Applied Polymer Sci

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Bifunctional nanofiber mats consisting of chitosan (CS), poly(vinyl alcohol) (PVA), and silver nanocrystals (Ag NCs) have been fabricated by a facile electrospinning method. The formation and presence of Ag NCs supported on CS/PVA nanofibers are confirmed by ultraviolet‐visible spectroscopy and X‐ray diffraction. The morphology of the samples is characterized by transmission electron microscopy and scanning electron microscopy. The prepared Ag NCs/CS/PVA nanofiber mats show pronounced antibacterial activity against Escherichia coli and excellent filtration property for suspended particulate matter (SPM) particles. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46504.

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“…The major limitation is the time taken for the dye exchange and some inevitable fine tuning of the laser. We believe that our system may find application in cases where subtle details of the map are to be studied, where the incoming laser brilliance can be a decisive factor, e.g., when studying weakly allowed electronic transitions or vibrational modes, [20] electron-phonon interactions, [5] or other weak modes, e.g., after chirality-selective separation. [21,22]…”

Section: Photoluminescence Measurements On Swcnts With the Pulsed Dyementioning

confidence: 99%

Improved Laser‐Based Photoluminescence on Single‐Walled Carbon Nanotubes

Kollarics

Palotás

Bojtor

et al. 2019

Physica Status Solidi (b)

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Photoluminescence (PL) is a common tool to characterize various properties of single‐walled carbon nanotube (SWCNT) chirality distribution and the level of tube individualization in SWCNT samples. Most PL studies use conventional lamp light sources whose spectral distribution is filtered with a monochromator, but this results in a still impure spectrum with a low spectral intensity. Tunable dye lasers offer a tunable light source which cover the desired excitation wavelength range with a high spectral intensity, but their operation is often cumbersome. Herein, the design and properties of an improved dye‐laser system which is based on a Q‐switch pump laser are presented. The high peak power of the pump provides an essentially threshold‐free lasing of the dye laser, which substantially improves the operability. It allows operation with laser dyes, such as Rhodamin 110 and Pyridin 1, which are otherwise on the border of operation of the laser. The system allows to cover the 540–730 nm wavelength range with four dyes. In addition, the dye laser output pulses closely follow the properties of the pump, which directly provides a time‐resolved and tunable laser source. The performance of the system by measuring the PL map of a HiPco SWCNTs sample is demonstrated.

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Electrooxidative para-selective C–H/N–H cross-coupling with hydrogen evolution to synthesize triarylamine derivatives

Cited by 151 publications

References 68 publications

Understanding the Selection Mechanism of the Polymer Wrapping Technique toward Semiconducting Carbon Nanotubes

Understanding the Selection Mechanism of the Polymer Wrapping Technique toward Semiconducting Carbon Nanotubes

Ultrasmall Ag nanocrystals supported on chitosan/PVA nanofiber mats with bifunctional properties

Improved Laser‐Based Photoluminescence on Single‐Walled Carbon Nanotubes

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