Enhanced green photoluminescence and dispersion of ZnO quantum dots shelled by a silica shell

Alvarado, José Alberto; Pacio, M.; Arce‐Plaza, Antonio; Santoyo-Salazar, J.; Liang, Lingling; Sue, Hung‐Jue

doi:10.1007/s11051-020-04985-6

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…The contribution of crystallite defects and oxygen vacancies caused by the ZnO distribution is more significant than the effect of the particle size. This suggests a similar phenomenon to that recorded in ZnO nanocomposites such as ZnO/SiO 2 [40,41]. The effect of Zn content on optical features is confirmed by the PL spectra presented in Figure 7c.…”

Section: Optical Properties Of Materialssupporting

confidence: 82%

Influencing Factors in the Synthesis of Photoactive Nanocomposites of ZnO/SiO2-Porous Heterostructures from Montmorillonite and the Study for Methyl Violet Photodegradation

et al. 2021

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In this work, photoactive nanocomposites of ZnO/SiO2 porous heterostructures (PCHs) were prepared from montmorillonite clay. The effects of preparation methods and Zn content on the physicochemical features and photocatalytic properties were investigated. Briefly, a comparison of the use of hydrothermal and microwave-assisted methods was done. The Zn content was varied between 5 and 15 wt% and the characteristics of the nanomaterials were also examined. The physical and chemical properties of the materials were characterized using X-ray diffraction, diffuse-reflectance UV-Vis, X-ray photoelectron spectroscopy, and gas sorption analyses. The morphology of the synthesized materials was characterized through scanning electron microscopy and transmission electron microscopy. The photocatalytic performance of the prepared materials was quantified through the photocatalytic degradation of methyl violet (MV) under irradiation with UV and visible light. It was found that PCHs exhibit greatly improved physicochemical characteristics as photocatalysts, resulting in boosting photocatalytic activity for the degradation of MV. It was found that varied synthesis methods and Zn content strongly affected the specific surface area, pore distribution, and band gap energy of PCHs. In addition, the band gap energy was found to govern the photoactivity. Additionally, the surface parameters of the PCHs were found to contribute to the degradation mechanism. It was found that the prepared PCHs demonstrated excellent photocatalytic activity and reusability, as seen in the high degradation efficiency attained at high concentrations. No significant changes in activity were seen until five cycles of photodegradation were done.

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Section: Optical Properties Of Materialssupporting

confidence: 82%

Influencing Factors in the Synthesis of Photoactive Nanocomposites of ZnO/SiO2-Porous Heterostructures from Montmorillonite and the Study for Methyl Violet Photodegradation

et al. 2021

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“…It is also suggested that 1DZnO surface coating with a polymeric APTMS layer can modify the emission response and intensity due to surface passivation or electron injection (APTMS‐lowest unoccupied molecular orbital (LUMO) towards the ZnO conduction band, enhancing the radiative recombination efficiency in the NBE region. [ 56–58 ] Therefore, the functionalization strategy using acetone as solvent is an option to modulate between non‐radiative and near‐excitonic recombination. As observed, it is vital to correlate the measurable signal responses (visible PL emission) to the chemical surface changes after biofunctionalization (antibody attachment) on 1DZnO_2.…”

Section: Resultsmentioning

confidence: 99%

Interaction Study of Anti‐E. coli Immobilization on 1DZnO at Nanoscale for Optical Biosensing Application

Salinas

Galdámez‐Martínez

Tolibia

et al. 2023

Adv Materials Inter

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Developing low‐cost biosensing platforms for robust detection response and sensitivity at low concentrations is of great interest. This work reports synthesizing 1D ZnO nanostructured materials (1DZnO) with controllable properties utilizing a metal catalyst‐assisted vapor phase growth technique (VLS). The obtained materials are functionalized with (3‐aminopropyl) trimetoxysilane (APTMS) and immobilized with anti‐Escherichia coli enteropathogenic (EPEC) antibodies. Characterization results show changes in the optical and structural properties of 1DZnO that are correlated with the biofunctionalization methodologies. Further, the biofunctionalization process is assessed on 1DZnO surface platforms to obtain acceptable antibody immobilization efficiencies (52%, 96%, and 100%) using a low‐concentration antibody solution (30 µg ml−1). Special techniques such as focused ion beam micromachining and scanning tunneling electron microscopy are proposed to appreciate the semiconductor biofunctionalization layer around 1DZnO and explain the physics of the interaction process. It is found that morphology obtained from distinct synthesis methods, solvents, and functionalization agents can generate functional groups for biomolecule attachment. Remarkably, it is demonstrated that biofunctionalization on 1DZnO takes place all over a single nanostructure. This work presents a proof‐of‐concept focused on generating pathogen sensing platforms using 1DznO semiconducting materials, providing new insights into bio‐analytes interaction with structures at the nanoscale.

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“…This effect is especially pronounced in the samples with higher weight percentages of QDs and the samples with 10% loading have the lowest transmission at these wavelengths (Figure 6). Nanoparticles have a tendency to clump into aggregates at higher concentrations, 18 which obstructs the passage of visible light. This agglomeration is observed in the confocal image taken of the 2.5% laminate layer, as shown in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

“…However, the visible light emission can be shifted through the introduction of capping agents, such as silanes, that shift the emission into higher energy blue light . Metal oxides such as ZnO often possess surface hydroxyl groups that are residual from their synthesis, which can be reacted with silanes in condensation reactions to form silane that help stabilize the QD, enable better dispersion within a polymer matrix, and increase the photoluminescence yield of a QD. , Introducing silane-capped ZnO QDs within a transparent greenhouse polymer would provide an excellent UV absorber, which downshifts the absorbed UV to photosynthetically active radiation (PAR), which could influence the growth of any green photoactive organisms.…”

Section: Introductionmentioning

confidence: 99%

Light Downshifting ZnO-EVA Nanocomposite Greenhouse Films and Their Influence on Photosynthetic Green Algae Growth

Hiscott

Cvetkovska

Mumin

et al. 2021

ACS Appl. Polym. Mater.

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Greenhouses are self-contained ecosystems that can be optimized to create favorable microclimates for crop growth and productivity. Their productivity can be improved by introducing functionality to the polymer films using nanotechnology. In this work, ZnO quantum dots (QDs) were capped with vinyltrimethoxysilane (VTS) to help stabilize the QDs within the polymer matrix, improve material properties, and enhance light downshifting properties for enhanced plant photosynthesis. The VTS-ZnO QDs were solution-mixed with an ethylene vinyl acetate copolymer, resulting in a transparent nanocomposite that downshifted UV light into visible blue light and also improved the thermal and hydrophobic properties. Chlamydomonas reinhardtii was used as a model photosynthetic system to study how the QD-tuned light can enhance growth rates. Growth rates were increased up to 4.7% when cultured behind a ZnO nanocomposite film. Our results show that the VTS-ZnO nanocomposite films increase the available light within a greenhouse, demonstrating enhanced growth rates. Testing these effects on agricultural crops will be an important step for future work.

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Enhanced green photoluminescence and dispersion of ZnO quantum dots shelled by a silica shell

Cited by 10 publications

References 26 publications

Influencing Factors in the Synthesis of Photoactive Nanocomposites of ZnO/SiO2-Porous Heterostructures from Montmorillonite and the Study for Methyl Violet Photodegradation

Influencing Factors in the Synthesis of Photoactive Nanocomposites of ZnO/SiO2-Porous Heterostructures from Montmorillonite and the Study for Methyl Violet Photodegradation

Interaction Study of Anti‐E. coli Immobilization on 1DZnO at Nanoscale for Optical Biosensing Application

Light Downshifting ZnO-EVA Nanocomposite Greenhouse Films and Their Influence on Photosynthetic Green Algae Growth

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