Synthesis of Polyvinylcarbazole/Reduced Graphite Oxide‐ZnO Nanocomposites

Mota, Isabela Custódio; Marques, Maria de Fátima Vieira

doi:10.1002/masy.201700081

Cited by 4 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Raha and co-workers [60] reviewed the ZnO nanostructured materials and their potential applications, focusing on the progress, challenges, and perspectives. Mota and co-workers [61] synthesized the polyvinyl carbazole/reduced graphite oxide/ZnO nanocomposites. Camarda and co-workers [62] investigated the luminescence mechanisms of defective ZnO nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Strong Interface Interaction of ZnO Nanosheets and MnSx Nanoparticles Triggered by Light over Wide Ranges of Wavelength to Enhance Their Removal of VOCs

Ma,

Zhang,

Gao

et al. 2023

Coatings

View full text Add to dashboard Cite

The characteristics of the surface and interface of nanocomposites are important for exerting multi-functional properties and widening interdisciplinary applications. These properties are mainly depending on the electronic structures of materials. Some key factors, such as the surface, interface, grain boundaries, and defects take vital roles in the contribution of desired properties. Due to the excellent sensitivity of the QCM (quartz crystal microbalance) device, the surface and interface features of the nanocomposite were studied with the aid of the gas-response of the sensors (Sensor’s Gas-Sensitivity) in this work. To make full use of the visible light and part of NIR, a ZnO/MnSx nanocomposite was constructed using hydrothermal synthesis for narrowing the bandgap width of wide bandgap materials. The results indicated that the absorbance of the resulting nanocomposite was extended to part of the NIR range due to the introduction of impurity level or defect level, although ZnO and MnS belonged to wide bandgap semiconductor materials. To explore the physical mechanism of light activities, the photoconductive responses to weak visible light (650 nm, etc.) and NIR (near-infrared) (808 nm, 980 nm, and 1064 nm, etc.) were studied based on interdigital electrodes of Au on flexible PET (polyethylene terephthalate) film substrate with the casting method. The results showed that the on/off ratio of ZnO/MnSx nanocomposite to weak visible light and part of NIR light were changed by about one to five orders of magnitude, with changes varying with the amount of MnSx nanoparticle loading due to defect-assisted photoconductive behavior. It illustrated that the ZnO/MnSx nanocomposite easily produced photo-induced free charges, effectively avoiding the recombination of electrons/holes because of the formation of strong built-in electrical fields. To examine the surface and interface properties of nanocomposites, chemical prototype sensor arrays were constructed based on ZnO, ZnO/MnSx nanocomposite, and QCM arrays. The adsorption response behaviors of the sensor arrays to some typical volatile compounds were examined under a similar micro-environment. The results exhibited that in comparison to ZnO nanosheets, the ZnO nanosheets/MnSx nanocomposite increased adsorption properties to some typical organic volatile compounds significantly. It would have good potential applications in photo-catalysts, self-cleaning films, multi-functional coatings, and organic pollutants treatment (VOCs) of environmental fields for sustainable development. It provided some reference value to explore the physical mechanism of materials physics and photophysics for photo-active functional nanocomposites.

show abstract

Section: Introductionmentioning

confidence: 99%

Strong Interface Interaction of ZnO Nanosheets and MnSx Nanoparticles Triggered by Light over Wide Ranges of Wavelength to Enhance Their Removal of VOCs

Ma,

Zhang,

Gao

et al. 2023

Coatings

View full text Add to dashboard Cite

show abstract

“…42 Similar results were obtained by preparing conductive nanocomposite but using reduced GO (rGO) instead of the normal GO. 43,44 Advincula et al has reported the preparation of PVK-CNTs nanocomposites dispersions that showed good stability for an extended time period (months) without any precipitation of CNTs, suggesting PVK is a suitable matrix for conductive nanocomposites. 37 Another interesting polymer that has been used for the dispersion of GF is PVI.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of poly(1‐vinylimidazole)‐block‐poly(9‐vinylcarbazole) copolymers via RAFT and their use in chemically responsive graphitic composites

Migliore

Araya-Hermosilla

Scheutz

et al. 2021

Journal of Polymer Science

View full text Add to dashboard Cite

This study reports the synthesis of novel poly(1-vinylimidazole)-b-poly(9-vinylcarbazole) (PVI-b-PVK) block copolymers with varying monomer ratios using reversible addition-fragmentation chain-transfer (RAFT) polymerization and their incorporation in responsive composite materials. Specifically, noncovalent exfoliation of two different conductive fillers, multi-walled carbon nanotubes (MWCNTs) or reduced graphene oxide (rGO), was studied. The percolation threshold of the synthesized nanocomposites was dependent on the polymer used for dispersion, showing a better affinity of the fillers for block copolymers with higher relative carbazole content. Resistivity measurements showed selective variation in the resistance signal when the materials were exposed to various organic solvents and acids, providing a good basis for the design of sensing devices.

show abstract