Recrystallization techniques for the synthesis of ZnO nanorods: an <i>in situ</i> process for carbon doping and enhancing the dispersion concentration of ZnO nanorods

Hossain, Muhammad Mohsin; Islam, Md. Akherul; Shima, Hossain; Hasan, Mudassir; Hilal, Muhammad; Lee, Moonyong

doi:10.1039/c8ra03016b

Cited by 14 publications

(5 citation statements)

References 60 publications

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“…The high-resolution TEM (HRTEM) image in Figure 4d,e shows the clear lattice fringes from ZnR's tip to stem with distance of ≈0.26 nm, which corresponds to the growth direction of [001], while the inset Fourier transform (FFT) images shown are assigned to the (002) plane. [38,39] Besides, the TEM images of the other ZnO growth structures are also shown in Figure S6 (Supporting Information), whereby the observed crystal planes agree with the XRD results. Thus, by comparing the structural characterizations with the electrical performances, we can confirm that the (002) vertical growth structure is the main contributor towards the generation of piezoelectric charges and the enhancement of the output performances of the H-P/TENGs.…”

Section: Characterizations Of Zno-based H-p/tengssupporting

confidence: 74%

Modulating ZnO Growth Structures for Maximum Power Output of Hybrid Piezo/Triboelectric Nanogenerator

Lim

Koay

Zhao

et al. 2022

Adv Funct Materials

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Hybrid piezo/triboelectric nanogenerators (H-P/TENGs) are developed to compensate the drawbacks of a single nanogenerator by synergizing high triboelectric output voltage and piezoelectric output current in continuous contact-separation cycles. In particular, piezoelectric zinc oxide (ZnO) has been widely used due to its excellent orientation along the c-axis and tunable growth structures. Herein, various growth structures of ZnO, unoriented, oriented, and hierarchical structures, are incorporated in H-P/TENGs, enhancing their power densities from 6 to 17 times. Particularly, oriented ZnO nanorod/ PVA (ZnR) achieves a maximum power density of 15.9 W m −2 (≈17-fold increment compared to pristine PVA). The highly oriented ZnO growth along the c-axis enables large deformation upon a vertical compression, subsequently generating a large piezoelectric polarization. Moreover, the enhancement mechanism via piezoelectric polarization is elucidated using a modified overlapped electron cloud model supported with Kelvin probe force microscopy measurements. The polarization of ZnO nanocomposites enlarges the difference in the highest electron energies (ΔE) between the two triboelectric layers, driving more electrons to transfer during contact electrification, thereby enriching their surface charge densities. This study highlights the significance of growth structure control in maximizing the piezoelectric responses of ZnO, consequently improving the output performances of H-P/TENGs.

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Section: Characterizations Of Zno-based H-p/tengssupporting

confidence: 74%

Modulating ZnO Growth Structures for Maximum Power Output of Hybrid Piezo/Triboelectric Nanogenerator

Lim

Koay

Zhao

et al. 2022

Adv Funct Materials

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“…The carbon peaks were deconvoluted using the XPSPEAK41 software. The five peaks in the spectrum of the C@AgNPs were resolved at 284.3, 284.6, 285.1, 286.39, and 288.4 eV, which are assigned to CC ( sp 2 ), C–C ( sp 3 ), C–O (hydroxyl or epoxy), C–O–C (ether), and Ag–C–O–C–Ag, correspondingly (Figure c). The maximum at 284.3 eV corresponds to a carbon layer containing sp 2 graphitic carbon.…”

Section: Resultsmentioning

confidence: 99%

Subnanometer Thick Carbon-Layer-Encapsulated Silver Nanoparticles Selectively Neutralizing Human Cancer Cells and Pathogens through Controlled Release of Ag⁺ Ions

Islam

Sapkota

Riaz

et al. 2021

ACS Appl. Nano Mater.

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We present the excellent and selective activity against human cancer cells and pathogens by double-layer carbon-encapsulated silver nanoparticles (C@AgNPs) and monolayer carbon-encapsulated silver nanoparticles (AC@AgNPs). C@AgNPs were synthesized via a modified solvothermal approach, whereas AC@AgNPs were prepared by exfoliation of the outer carbon layer of C@AgNPs. The physicochemical structures and properties of the C@AgNPs and AC@AgNPs are thoroughly examined; the carbon layer is found to ensure the needful release of Ag+ ions from the core Ag nanoparticles, and improve the biocompatibility and selectivity of NPs to kill the cancer cells. Hence, the C@AgNPs and AC@AgNPs are substantiated to be beneficial for controlling the overtoxicity caused by unstable bare AgNPs and achieving the targeted actions. The Ag+ ions exhibit their toxic effects against cancer cells or pathogens chiefly through the reactive oxygen species (ROS) generation. The Ag+-ion release and ROS generation of the AC@AgNPs are found greater than those of the C@AgNPs because of the synergistic effect of the reduced thickness of carbon layer and increased specific surface area. The C@AgNPs and AC@AgNPs were applied against cancer cells (K562 and Hep3B), normal cells (LO2), and pathogens in vitro. The AC@AgNPs exhibit greater dose- and time-dependent late apoptosis of cancer cells than the C@AgNPs, and reduce the viability of cancer cells more effectively than the C@AgNPs. The crystal violet assay explicitly displays that the as-prepared samples exhibit preferential attack on cancer cells. In the analysis of apoptosis associated proteins, caspase-3 and PARP as markers, the protein expression was visible only for the cancer cells asserting that the prepared C@AgNPs and AC@AgNPs act selectively, invading only the cancer cells. Moreover, the AC@AgNPs exhibit a larger linear inhibition zone than the C@AgNPs against both Gram negative and Gram positive pathogenic bacterial stains in bactericidal activity probes.

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“…That was followed by curing at 150˚C for several minutes. The curing step was repeated several times to create a uniform thin-film, which was annealed at 400˚C for 30 minutes [15]. At this stage, ZnO nano-crystals are created now on the thin-film through thermal decomposition of the zinc acetate.…”

Section: Methodsmentioning

confidence: 99%

Crystal Facets Influence on Photocatalytic Properties of ZnO Nanomaterials

Alenezi

Almeshal

Alkhaledi

2023

JNanoR

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Using a facile hydrothermal method, ZnO nanomaterials with various morphological structures (nanowires, nanodiscs, and nanostars) were produced. An investigation was conducted into the relationships between the exposed polar facets and the photocatalytic activities. Based on XPS, Pl, and structural analysis, it was discovered that the exposed facets’ chemsorption ability of the different ZnO nanomaterials with different morphologies plays a vital role in their photocatalytic properties. Zinc-terminated surfaces had the highest chemsorption ability and consequently the ZnO nanodiscs with the highest fraction of exposed Zinc-terminated facets were the ideal photocatalysts from the tested morphologies. This work emphasises the important influence of rational control over the nanomaterial morphology on its physical and chemical properties and therefore on its performance in various practical applications.

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Recrystallization techniques for the synthesis of ZnO nanorods: an in situ process for carbon doping and enhancing the dispersion concentration of ZnO nanorods

Abstract: Dispersed ZnO hexagonal nanorods in ethanol solvent and its interfacial behavior in this liquid phase.

Cited by 14 publications

References 60 publications

Modulating ZnO Growth Structures for Maximum Power Output of Hybrid Piezo/Triboelectric Nanogenerator

Modulating ZnO Growth Structures for Maximum Power Output of Hybrid Piezo/Triboelectric Nanogenerator

Subnanometer Thick Carbon-Layer-Encapsulated Silver Nanoparticles Selectively Neutralizing Human Cancer Cells and Pathogens through Controlled Release of Ag⁺ Ions

Crystal Facets Influence on Photocatalytic Properties of ZnO Nanomaterials

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Recrystallization techniques for the synthesis of ZnO nanorods: an in situ process for carbon doping and enhancing the dispersion concentration of ZnO nanorods

Abstract: Dispersed ZnO hexagonal nanorods in ethanol solvent and its interfacial behavior in this liquid phase.

Cited by 14 publications

References 60 publications

Modulating ZnO Growth Structures for Maximum Power Output of Hybrid Piezo/Triboelectric Nanogenerator

Modulating ZnO Growth Structures for Maximum Power Output of Hybrid Piezo/Triboelectric Nanogenerator

Subnanometer Thick Carbon-Layer-Encapsulated Silver Nanoparticles Selectively Neutralizing Human Cancer Cells and Pathogens through Controlled Release of Ag+ Ions

Crystal Facets Influence on Photocatalytic Properties of ZnO Nanomaterials

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Product

Resources

About

Subnanometer Thick Carbon-Layer-Encapsulated Silver Nanoparticles Selectively Neutralizing Human Cancer Cells and Pathogens through Controlled Release of Ag⁺ Ions