Hybridization of carbon-dots with ZnO nanoparticles of different sizes

Efa, Mulugeta Tesema; Imae, Toyoko

doi:10.1016/j.jtice.2018.02.007

Cited by 50 publications

(24 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Full XPS scan surveys were exhibited peaks that are assigned to C 1s, N 1s, O 1s, and F 1s. GO possessed deconvoluted C 1s species of aromatic CC, carboxylic acid (COOH), ketone (CO) and hydroxyl (C–OH). , F -PEG@GO showed additional alkyl (CH 2 ) and carbon–fluorine (C–F) species contributed from F -PEG . O 1s fine analysis appeared chemical species of ketone (CO), carboxylic acid (CO and OH) and hydroxyl (OH) in GO .…”

Section: Resultsmentioning

confidence: 99%

Nitric Oxide Gas Delivery by Fluorinated Poly(Ethylene Glycol)@Graphene Oxide Carrier toward Pharmacotherapeutics

Workie

Sabrina

Imae

et al. 2019

ACS Biomater. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

In view of preparing effective nitric oxide gas carriers, a fluorinated poly(ethylene glycol) (F-PEG) was non-covalently conjugated with acid-treated graphene oxide (GO) to prepare the composite of F-PEG@GO. When the persistence of NO gas doped on GO and F-PEG@GO was investigated for 3 h, the conserved NO gas decreased from 49.00±7.06 to 2.17±1.36 nmol/mg carrier and from 58.51± 6.02 to 4.58±2.22 nmol/mg carrier, respectively. The adsorption of F-PEG on GO and the doping of NO on GO and F-PEG@GO were declarative by the increase of distance between GO sheets, and the NO-doping was also clarified by infrared absorption and X-ray photoelectron spectroscopies. The anti-bacterial effect was higher for NO-conserved F-PEG@GO than for NO-conserved GO and more effective against Staphylococcus aureus than against Escherichia coli. It is evident that the coating of F-PEG on GO is preferable for advancing the loading efficiency, the stability and the biomedical efficacy of NO gas.

show abstract

Section: Resultsmentioning

confidence: 99%

Nitric Oxide Gas Delivery by Fluorinated Poly(Ethylene Glycol)@Graphene Oxide Carrier toward Pharmacotherapeutics

Workie

Sabrina

Imae

et al. 2019

ACS Biomater. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…A peak at 873.7 eV corresponds to the main peak of Ni 2p 1/2 and a peak at 879.8 eV is its satellite. , Similarly, the Ni 2p deconvolution peaks in ZnO/NiO(8 wt %)/Cdot(1:1, 5 wt %) were at 855.9 and 861.6 eV and 873.2 and 879.5 eV for 2p 3/2 and 2p 1/2, corresponding to their main and satellite peaks, respectively. For a Zn 2p high-resolution XPS spectrum of ZnO/NiO(8 wt %), a peak at 1023.2 eV is ascribed to Zn 2p 3/2 and an additional peak at 1046.2 eV is ascribed to Zn 2p 1/2 . − The splitting of spin–orbit between Zn 2p 3/2 and Zn 2p 1/2 is 23 eV for both ZnO/NiO(8 wt %) and ZnO/NiO(8 wt %)/Cdot(1:1, 5 wt %), suggesting that the chemical state of Zn 2+ is the same in ZnO/NiO(8 wt %) and ZnO/NiO(8 wt %)/Cdot(1:1, 5 wt %). From the characterization of XPS, it is revealed that the coexistence of the nanocomposites (ZnO, NiO, and Cdots) was successfully confirmed.…”

Section: Resultsmentioning

confidence: 96%

“…On a C 1s peak, ZnO/NiO(8 wt %) displayed two deconvoluted species, which correspond to aliphatic (sp 3 ) C–C (284.9 eV) and C–OH (287.2 eV) bonds of ethylene glycol adsorbed onto ZnO during the synthesis. Whereas, the binding energies of the relevant species in ZnO/NiO(8 wt %)/Cdot(1:1, 5 wt %) were at 285.0 and 286.7 eV and the peaks from species of Cdots appeared at 284.3 eV (CC bond), 285.8 eV (C–N bond), and 288.8 eV (CO bond) . Although ZnO/NiO(8 wt %) does not have a nitrogen element, the amine group (C–NH 2 bond) exists in Cdots of ZnO/NiO(8 wt %)/Cdot(1:1, 5 wt %), and it appeared at 400.7 eV.…”

Section: Resultsmentioning

confidence: 99%

“…Whereas, the binding energies of the relevant species in ZnO/ NiO(8 wt %)/Cdot(1:1, 5 wt %) were at 285.0 and 286.7 eV and the peaks from species of Cdots appeared at 284.3 eV (CC bond), 285.8 eV (C−N bond), and 288.8 eV (CO bond). 34 Although ZnO/NiO(8 wt %) does not have a nitrogen element, the amine group (C−NH 2 bond) exists in Cdots of ZnO/NiO(8 wt %)/Cdot(1:1, 5 wt %), and it appeared at 400.7 eV. The O 1s peak in ZnO/NiO(8 wt %) can be deconvoluted into two species at 530.5 and 532.9 eV, which occurred from metal−oxygen bonds (Zn−O and Ni−O bonds) and the O−C bond of ethylene glycol on ZnO, respectively.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nanocomposite Photoanodes Consisting of p-NiO/n-ZnO Heterojunction and Carbon Quantum Dot Additive for Dye-Sensitized Solar Cells

Geleta

Imae

2021

ACS Appl. Nano Mater.

Self Cite

View full text Add to dashboard Cite

To increase the performance of power conversion efficiency of dye-sensitized solar cells (DSSCs), in the current paper, nanocomposites of n-type ZnO and p-type NiO semiconductors were constructed as photoanodes in DSSCs. Furthermore, the influence of the addition of carbon quantum dots on the nanocomposites of n-ZnO and p-NiO was evaluated. The efficiency achieved was 1.58 times of that of ZnO with addition of 8 wt % NiO. Moreover, the doping of carbon quantum dots in the nanocomposites of ZnO/NiO(8 wt %) enhanced the efficiency up to 3.8 times of that of ZnO/NiO(8 wt %). The value (13.02% (430 nm LED@100 W/m2)) was the highest among that of the carbon dot-incorporating DSSCs. NiO and ZnO semiconductors created a p–n heterojunction, gave rise to faster separation of charges, and minimized the recombination of electrons. Carbon quantum dots promoted the charge carrier transport by converting photon to charge and reducing the potential barrier of the charge carrier at the interfaces of n-ZnO/carbon dots and carbon dots/p-NiO. These results suggest that the adequate selection of the band gap energy levels of the materials induces the preferable charge separation. Especially, the effect reducing the potential barrier of charge carriers by carbon quantum dots is prominent to improve the photovoltaic efficiency of the DSSCs. Thus, the nanoscale materials of ZnO, NiO and Cdots were promising for the enhancement of photovoltaic performance.

show abstract

“…Nanoparticles, such as ZrO 2 , Al 2 O 2 , SiO 2 , Fe 3 O 4 , ZnO, and TiO 2 , have been reported to impart hydrophilicity onto modified PA-TFC membrane surfaces [8][9][10][11]. As such, their incorporation into PA-TFC membranes improves the water permeability and fouling resistance of PA-TFC membrane surfaces.…”

Section: Introductionmentioning

confidence: 99%

An In Situ Incorporation of Acrylic Acid and ZnO Nanoparticles into Polyamide Thin Film Composite Membranes for Their Effect on Membrane pH Responsive Behavior

et al. 2021

View full text Add to dashboard Cite

This paper focuses on an in situ interfacial polymerization modification of polyamide thin film composite membranes with acrylic acid (AA) and zinc oxide (ZnO) nanoparticles. Consequent to this modification, the modified polyamide thin film composite (PA–TFC) membranes exhibited enhanced water permeability and Pb (II) heavy metal rejection. For example, the 0.50:1.50% ZnO/AA modified membranes showed water permeability of 29.85 ± 0.06 L·m−2·h−1·kPa−1 (pH 3), 4.16 ± 0.39 L·m−2·h−1·kPa−1 (pH 7), and 2.80 ± 0.21 L·m−2·h−1·kPa−1 1 (pH 11). This demonstrated enhanced pH responsive properties, and improved water permeability properties against unmodified membranes (2.29 ± 0.59 L·m−2·h−1·kPa−1, 1.79 ± 0.27 L·m−2·h−1·kPa−1, and 0.90 ± 0.21 L·m−2·h−1·kPa−1, respectively). Furthermore, the rejection of Pb (II) ions by the modified PA–TFC membranes was found to be 16.11 ± 0.12% (pH 3), 30.58 ± 0.33% (pH 7), and 96.67 ± 0.09% (pH 11). Additionally, the membranes modified with AA and ZnO/AA demonstrated a significant pH responsiveness compared to membranes modified with only ZnO nanoparticles and unmodified membranes. As such, this demonstrated the swelling behavior due to the inherent “gate effect” of the modified membranes. This was illustrated by the rejection and water permeation behavior, hydrophilic properties, and ion exchange capacity of the modified membranes. The pH responsiveness for the modified membranes was due to the –COOH and –OH functional groups introduced by the AA hydrogel and ZnO nanoparticles.

show abstract

Hybridization of carbon-dots with ZnO nanoparticles of different sizes

Cited by 50 publications

References 20 publications

Nitric Oxide Gas Delivery by Fluorinated Poly(Ethylene Glycol)@Graphene Oxide Carrier toward Pharmacotherapeutics

Nitric Oxide Gas Delivery by Fluorinated Poly(Ethylene Glycol)@Graphene Oxide Carrier toward Pharmacotherapeutics

Nanocomposite Photoanodes Consisting of p-NiO/n-ZnO Heterojunction and Carbon Quantum Dot Additive for Dye-Sensitized Solar Cells

An In Situ Incorporation of Acrylic Acid and ZnO Nanoparticles into Polyamide Thin Film Composite Membranes for Their Effect on Membrane pH Responsive Behavior

Contact Info

Product

Resources

About