Statistical morphological identification of low-dimensional nanomaterials by using TEM

Pu, Yunjiao; Niu, Yiming; Wang, Yongzhao; Liu, Siyang; Zhang, Bingsen

doi:10.1016/j.partic.2021.03.013

Cited by 16 publications

(12 citation statements)

References 40 publications

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“…In contrast, the growth direction of ZnO nanosheets perpendicular to the c -axis such that the polar facets predominated. The aspect ratio ( c / a ) is used to evaluate morphology differences of ZnO nanomaterials, mainly reflected the proportion relationship between nonpolar and polar surface . As shown in Figure and Table S1, the aspect ratio of ZnO nanorod and nanosheet measured by selected area electron diffraction (SAED) were 6.09 and 0.17, respectively.…”

Section: Resultsmentioning

confidence: 94%

“…The aspect ratio (c/a) is used to evaluate morphology differences of ZnO nanomaterials, mainly reflected the proportion relationship between nonpolar and polar surface. 43 As shown in Figure 1 and Table S1, the aspect ratio of ZnO nanorod and nanosheet measured by selected area electron diffraction (SAED) were 6.09 and 0.17, respectively. The increase of that ratio demonstrates the accumulation along the crystallographic c-axis is favored, which is consistent with XRD results.…”

Section: Methodsmentioning

confidence: 96%

“…ZnO nanorods were prepared by the polyvinylpyrrolidone (PVP) assisted alcohol thermal method. , PVP (2.4 g, Sigma-Aldrich; Mw = 55 000), zinc acetate dihydrate (3.6 g, Alfa), and NaOH (1 g, Sinopharm Chemical Reagent Co.) were dissolved in 114 g of ethanol (Sinopharm Chemical Reagent Co.) in order and vigorously stirred for 2 h at RT, and an opalescent suspension was formed. Then, the obtained mixture was placed in an 80 °C oil bath and maintained for 24 h. The resulting precipitates were centrifuged and washed with deionized water and ethanol, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Sinter Resistance and Activity Enhancement via a Facet-Dependent Metal–Support Interaction of Pd/ZnO Catalysts in CO Oxidation

Niu

Wang

et al. 2021

J. Phys. Chem. C

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Metal−support interaction (MSI) has been extensively investigated regarding its structural and catalytic modification in heterogeneous catalysts. Herein, we reveal how facet-dependent MSI impacts on the structure and performance of Pd/ZnO in the CO oxidation reaction. ZnO nanosheets with orthohexagonal shape which are exposed mainly with {001} facets exhibit remarkable thermal stability under air atmosphere until 600 °C, while ZnO nanorods bounded with {100} facets transform at 400 °C and totally change after calcination at 600 °C. Thus, the Pd species supported on ZnO nanorods and nanosheets also display different sintering behaviors after thermal treatment, and the particle size of Pd grows from 1.1 to 5.7 nm on {100} facets while it keeps high-dispersion on {001} facets after 600 °C calcination. In situ transmission electron microscopy was used to visualize the sintering process, demonstrating that Pd displays the Ostwald ripening and particle migration coalescence mechanism on ZnO {100} facets, while shows extraordinary stability on ZnO {001} facets. Therefore, Pd supported on ZnO nanorod exhibits deactivation behavior after high temperature treatment in CO oxidation, during which the T 50 delays from 106 to 120 and 145 °C after 200, 400, and 600 °C calcination. Interestingly, Pd on ZnO nanosheet shows obvious activity enhancement from 137 to 90 and 75 °C of T 50 after the same treatment, which is ascribed to the synergy between Pd and ZnO {001} facets during catalysis. This work gives indepth understanding of the facet-dependent MSI of Pd/ZnO catalysts, and it sheds light on the rational design of heterogeneous catalysts with high efficiency and sinter resistance.

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Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Sinter Resistance and Activity Enhancement via a Facet-Dependent Metal–Support Interaction of Pd/ZnO Catalysts in CO Oxidation

Niu

Wang

et al. 2021

J. Phys. Chem. C

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“…Size difference between XRD and above-mentioned TEM was possibly attributed to the fact that XRD gives information about the grain size and larger particles may be polycrystalline as a result of the coalescence of smaller grains 67 , 68 .…”

Section: Resultsmentioning

confidence: 99%

“…XRD analysis detected the average crystalline size of obtained ZnO NPs ~ 11 nm using Debye-Scherrer's equation 66 . www.nature.com/scientificreports/ Size difference between XRD and above-mentioned TEM was possibly attributed to the fact that XRD gives information about the grain size and larger particles may be polycrystalline as a result of the coalescence of smaller grains 67,68 .…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Green synthesis of zinc oxide nanoparticles using Sea Lavender (Limonium pruinosum L. Chaz.) extract: characterization, evaluation of anti-skin cancer, antimicrobial and antioxidant potentials

Naiel

Fawzy

Halmy

et al. 2022

Sci Rep

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In the present study, a green, sustainable, simple and low-cost method was adopted for the synthesis of ZnO NPs, for the first time, using the aqueous extract of sea lavender, Limonium pruinosum (L.) Chaz., as a reducing, capping, and stabilizing agent. The obtained ZnO NPs were characterized using ultraviolet–visible spectroscopy (UV–VIS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The UV–Vis spectra of the green synthesized ZnO NPs showed a strong absorption peak at about 370 nm. Both electron microscopy and XRD confirmed the hexagonal/cubic crystalline structure of ZnO NPs with an average size ~ 41 nm. It is worth noting that the cytotoxic effect of the ZnO NPs on the investigated cancer cells is dose-dependent. The IC50 of skin cancer was obtained at 409.7 µg/ml ZnO NPs. Also, the phyto-synthesized nanoparticles exhibited potent antibacterial and antifungal activity particularly against Gram negative bacteria Escherichia coli (ATCC 8739) and the pathogenic fungus Candida albicans (ATCC 10221). Furthermore, they showed considerable antioxidant potential. Thus, making them a promising biocompatible candidate for pharmacological and therapeutic applications.

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Ultra-Efficient and Cost-Effective Platinum Nanomembrane Electrocatalyst for Sustainable Hydrogen Production

Gao,

Dai,

Teng

et al. 2024

Nano-Micro Lett.

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Hydrogen production through hydrogen evolution reaction (HER) offers a promising solution to combat climate change by replacing fossil fuels with clean energy sources. However, the widespread adoption of efficient electrocatalysts, such as platinum (Pt), has been hindered by their high cost. In this study, we developed an easy-to-implement method to create ultrathin Pt nanomembranes, which catalyze HER at a cost significantly lower than commercial Pt/C and comparable to non-noble metal electrocatalysts. These Pt nanomembranes consist of highly distorted Pt nanocrystals and exhibit a heterogeneous elastic strain field, a characteristic rarely seen in conventional crystals. This unique feature results in significantly higher electrocatalytic efficiency than various forms of Pt electrocatalysts, including Pt/C, Pt foils, and numerous Pt single-atom or single-cluster catalysts. Our research offers a promising approach to develop highly efficient and cost-effective low-dimensional electrocatalysts for sustainable hydrogen production, potentially addressing the challenges posed by the climate crisis.

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Statistical morphological identification of low-dimensional nanomaterials by using TEM

Cited by 16 publications

References 40 publications

Sinter Resistance and Activity Enhancement via a Facet-Dependent Metal–Support Interaction of Pd/ZnO Catalysts in CO Oxidation

Sinter Resistance and Activity Enhancement via a Facet-Dependent Metal–Support Interaction of Pd/ZnO Catalysts in CO Oxidation

Green synthesis of zinc oxide nanoparticles using Sea Lavender (Limonium pruinosum L. Chaz.) extract: characterization, evaluation of anti-skin cancer, antimicrobial and antioxidant potentials

Ultra-Efficient and Cost-Effective Platinum Nanomembrane Electrocatalyst for Sustainable Hydrogen Production

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