Monitoring dynamics of defects and single Fe atoms in N-functionalized few-layer graphene by in situ temperature programmed scanning transmission electron microscopy

Arrigo, Rosa; Sasaki, Takeo; Callison, June; Gianolio, Diego; Schuster, Manfred Erwin

doi:10.1016/j.jechem.2021.05.005

Cited by 8 publications

(4 citation statements)

References 41 publications

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“…Real-time imaging of single nanoparticles during their reactions and motions is vital to understanding their chemical [ 1 , 2 , 3 , 4 ], physical [ 5 , 6 ], and biological properties [ 7 , 8 ]. Although techniques such as atomic force microscopy (AFM) [ 9 , 10 , 11 ], liquid cell transmission electron microscopy (TEM) [ 12 , 13 , 14 ], and scanning electron microscopy (SEM) [ 15 , 16 ] are useful for monitoring single nanoparticles, they are expensive, exhibit low temporal resolution, and typically cannot be conducted under biophysical conditions. Thus, inadequate detailed kinetic information, inaccurate physical and chemical properties, and deactivation of biological function are problematic.…”

Section: Introductionmentioning

confidence: 99%

In Situ Direct Monitoring of the Morphological Transformation of Single Au Nanostars Induced by Iodide through Dual-Laser Dark-Field Microscopy: Unexpected Mechanism and Sensing Applications

Luo

Ouyang

et al. 2022

Nanomaterials

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Single nanoparticle imaging is a significant technique to help reveal the reaction mechanism and provides insight into the nanoparticle transformation. Here, we monitor the in situ morphological transformation of Au nanostars (GNSs) induced by iodide (I−) in real time using dark-field microscopy (DFM) with 638 nm red (R) and 534 nm green (G) laser coillumination. The two lasers are selected because the longitudinal localized surface plasmon resonance of GNSs is located at 638 nm and that for GNSs after transformation is at 534 nm. Interestingly, I− can interact with GNSs directly without the engagement of other reagents, and upon increasing I− concentrations, GNSs undergo color changes from red to orange, yellow, and green under DFM. Accordingly, green/red channel intensities (G/R ratios) are extracted by obtaining red and green channel intensities of single nanoparticles to weigh the morphological changes and quantify I−. A single nanoparticle sensor is constructed for I− detection with a detection limit of 6.9 nM. Finally, a novel mechanism is proposed to elucidate this shape transformation. I− absorbed onto the surface of GNSs binds with Au atoms to form AuI−, lowering the energy of its bond with other Au atoms, which facilitates the diffusion of this atom across the nanoparticle surface to low-energy sites at the concaves, thus deforming to spherical Au nanoparticles.

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Section: Introductionmentioning

confidence: 99%

In Situ Direct Monitoring of the Morphological Transformation of Single Au Nanostars Induced by Iodide through Dual-Laser Dark-Field Microscopy: Unexpected Mechanism and Sensing Applications

Luo

Ouyang

et al. 2022

Nanomaterials

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“…As a result, the Fe agglomerated. In addition, the C-C bonds are included at the edges of the site of the graphene layer at a higher temperature by the metal Fe atoms [32]. Wang et al used anthracite coal as a precursor to prepare synthetic graphite using several catalysts, including boric acid (H 3 BO 3 ), lanthanum oxide (La 2 O 3 ), cerium oxide (CeO 2 ), and praseodymium oxide (Pr 6 O 11 ), for LIB applications [33].…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Coal-Derived Few-Layer Graphene as an Anode Material for Lithium-Ion Batteries

et al. 2021

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A few-layer graphene (FLG) composite material was synthesized using a rich reservoir and low-cost coal under the microwave-assisted catalytic graphitization process. X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy were used to evaluate the properties of the FLG sample. A well-developed microstructure and higher graphitization degree were achieved under microwave heating at 1300 °C using the S5% dual (Fe-Ni) catalyst for 20 min. In addition, the synthesized FLG sample encompassed the Raman spectrum 2D band at 2700 cm−1, which showed the existence of a few-layer graphene structure. The high-resolution TEM (transmission electron microscopy) image investigation of the S5% Fe-Ni sample confirmed that the fabricated FLG material consisted of two to seven graphitic layers, promoting the fast lithium-ion diffusion into the inner surface. The S5% Fe-Ni composite material delivered a high reversible capacity of 287.91 mAhg−1 at 0.1 C with a higher Coulombic efficiency of 99.9%. In contrast, the single catalyst of S10% Fe contained a reversible capacity of 260.13 mAhg−1 at 0.1 C with 97.96% Coulombic efficiency. Furthermore, the dual catalyst-loaded FLG sample demonstrated a high capacity—up to 95% of the initial reversible capacity retention—after 100 cycles. This study revealed the potential feasibility of producing FLG materials from bituminous coal used in a broad range as anode materials for lithium-ion batteries (LIBs).

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“…This process takes place due to interactions of ionogenic groups at the surface and local doping of the material by metallic nanoparticles, which provides opportunities for application in many elds of modern industry. [2][3][4][5] Aer the Nobel Prize for the discovery of graphene was awarded to A. Geim and K. Novoselov, 6 a lot has been written about its properties, applications and production techniques. However, practically, it is almost impossible to obtain singlelayer graphene in signicant quantities.…”

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confidence: 99%

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confidence: 99%

Stability of iron single atoms in graphene structures from X-ray absorption spectroscopy data

Krot,

Savilov,

Arkhipova

et al. 2024

J. Anal. At. Spectrom.

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Monitoring dynamics of defects and single Fe atoms in N-functionalized few-layer graphene by in situ temperature programmed scanning transmission electron microscopy

Abstract: Ti t l e M o ni t o ri n g dy n a mi c s of d ef e c t s a n d si n gl e F e a t o m s in Nfu n c tio n aliz e d fe

Cited by 8 publications

References 41 publications

In Situ Direct Monitoring of the Morphological Transformation of Single Au Nanostars Induced by Iodide through Dual-Laser Dark-Field Microscopy: Unexpected Mechanism and Sensing Applications

In Situ Direct Monitoring of the Morphological Transformation of Single Au Nanostars Induced by Iodide through Dual-Laser Dark-Field Microscopy: Unexpected Mechanism and Sensing Applications

Microwave-Assisted Coal-Derived Few-Layer Graphene as an Anode Material for Lithium-Ion Batteries

Stability of iron single atoms in graphene structures from X-ray absorption spectroscopy data

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