Novel Synthesis of Polycarbazole–Gold Nanocomposite

Gupta, Bhavana; Joshi, Leela; Prakash, Rajiv

doi:10.1002/macp.201100262

Cited by 26 publications

(21 citation statements)

References 47 publications

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“…59,61 However, it was difficult to observe the surface plasmon band of AuNPs in the UV−vis spectrum of the resulting solution ( Figure 5B), even for the one with excess carbazole moieties (molar ratio of HAuCl 4 to carbazoles is 0.4:1). This result is consistent with our previous publication when using carbazole groups functionalized PAMAM dendrimers for the reduction of HAuCl 4 .…”

Section: ■ Results and Discussionmentioning

confidence: 97%

A Supramolecular Polyethylenimine-Cored Carbazole Dendritic Polymer with Dual Applications

et al. 2015

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A series of supramolecular dendritic multiarm polymers (SDMPs) are fabricated by simply mixing the hyperbranched polyethylenimine (PEI, 10K) and carboxylic acid-terminated carbazolecontaining dendrons. Carbazole-containing dendrons with different generations, i.e. generation zero (G0), generation one (G1), and generation two (G2), are employed for the formation of the nanocomplexes. The formation of SDMPs is demonstrated by the use of dynamic light scattering (DLS) and water contact angle (WCA) measurement. The ionic bonding between the PEIs and the surrounding carbazole-containing dendrons is also confirmed by the 1 H nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectra. The encapsulation capability of SDMPs is tested by monitoring the phase transfer process of anionic guests by UV−vis spectroscopy. The effect of the dendron generation on the encapsulation capability of SDMPs is evaluated as well. Without any additional reducing agent, the SDMPs are also utilized as the nanoreactors for the formation of the noble metal nanoparticle (NMNPs) while cross-linking the periphery carbazole shells simultaneously. The electrochemically active SDMPs, with the simple fabrication method and their utilization as the nanocarriers to encapsulate anionic guests and nanoreactors to generate conjugated polymer shells surrounded NMNPs, are expected to be ideal building blocks for the optoelectronic devices and intelligent materials. ■ INTRODUCTIONBy analogue with biomolecules that self-organize into the welldefined 3-D hierarchical structures with unique properties and functionalities, the synthesized polymers can also be programmed to self-assemble into functional supramolecular nanoobjects, i.e., supramolecular polymers (SPs). 1−4 The SPs have attracted broad interest in both academic and industrial fields due to their broad applications in catalysis, 5 drug delivery, 2,6 nanopattern fabrication, 7 information storage, 8 actuators, 9 liquid crystals, 10,11 self-healing material, 12,13 and optoelectronic devices. 14 Compared with the covalently bonded polymers, they enjoyed several advantages, such as simple preparation and purification, tunable structure and morphology, and stimulus response. 15 With a three-dimensional global architecture, supramolecular dendritic polymers (SDPs) exhibit good solubility, lower solution viscosity, and higher degree of functionality than their linear analogues. 15 With one multifunctional dendritic polymer as core and numerous linear polymers or dendrons with one complementary unit as shells, supramolecular dendritic multiarm copolymers (SDMPs) usually possess two chemically distinct components. As a unique class of SDPs, SDMPs exhibit great potentials in drug delivery, 2,16 templated polymerization, 17 nanoparticle formation, 18,19 and catalysis. 5 The dendritic polymer and surrounding linear polymers or dendrons are held together by the secondary interactions, such as hydrogen bonding, 14 electrostatic interactions, 18,20 and host−guest complexation. 21 The ionic bond...

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Section: ■ Results and Discussionmentioning

confidence: 97%

A Supramolecular Polyethylenimine-Cored Carbazole Dendritic Polymer with Dual Applications

et al. 2015

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“…Gupta et al (2011) also reported on the synthesis and properties of polycarbazole-gold nanocomposites. The authors reported that the type of intercalation agent and mixing method had an impact on the structure and properties of the composite materials obtained.…”

Section: Nanocomposites With Engineering Polymersmentioning

confidence: 99%

Nanocomposites with engineering polymers

Mittal¹

2015

Manufacturing of Nanocomposites With Engineering Plastics

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“…As compared to other conducting polymers, polycarbazoles have a much better stability due to the fully aromatic carbazole moiety [15] as indicated by a higher oxidation potential [16,17]. Carbazole-based conjugated polymer systems are widely known for its photoconductive, hole transport properties and high charge mobility which are essential in developing polymeric light emitting diodes (PLED), organic photorefractive materials, electrochromic displays and other electronic devices [16]. Furthermore, the carbazole moiety is highly reactive at various points: C-2, C-3, C-6, C-7 and the N positions, which allow flexible modification schemes.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the conducting polymer selected is a polycarbazole that has been electrochemically synthesized from a first generation carbazole monomer with tetraethylene glycol functional group. As compared to other conducting polymers, polycarbazoles have a much better stability due to the fully aromatic carbazole moiety [15] as indicated by a higher oxidation potential [16,17]. Carbazole-based conjugated polymer systems are widely known for its photoconductive, hole transport properties and high charge mobility which are essential in developing polymeric light emitting diodes (PLED), organic photorefractive materials, electrochromic displays and other electronic devices [16].…”

Section: Introductionmentioning

confidence: 99%