Applications of Transmission Electron Microscopy in Phase Engineering of Nanomaterials

Li, Guanxing; Zhang, Hui; Han, Yu

doi:10.1021/acs.chemrev.3c00364

Cited by 15 publications

(2 citation statements)

References 203 publications

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“…The difference in symmetry between the octahedrally coordinated 1T-MoSe 2 and the trigonally coordinated 2H-MoSe 2 crystal structures (shown in Figure f,g) was directly observed using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and this technique directly showed the difference in atomic arrangements between 2H-MoSe 2 and 1T-MoSe 2 . An atomically resolved HAADF-STEM image of 1T-MoSe 2 showed zigzag chains (Figure h) that were consistent with previously reported observations. , Energy-dispersive X-ray (EDS) mapping images (Figure i) showed the uniform distribution of Mo, Se, Ce, and O elements within the MoSe 2 /CeO 2 composite.…”

Section: Resultssupporting

confidence: 86%

Phase-Engineered MoSe₂/CeO₂ Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH₃ and TEA Gases

Singh,

Shin,

Moon

et al. 2024

ACS Sens.

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Detecting and distinguishing between hazardous gases with similar odors by using conventional sensor technology for safeguarding human health and ensuring food safety are significant challenges. Bulky, costly, and power-hungry devices, such as that used for gas chromatography−mass spectrometry (GC−MS), are widely employed for gas sensing. Using a single chemiresistive semiconductor or electric nose (e-nose) gas sensor to achieve this objective is difficult, mainly because of its selectivity issue. Thus, there is a need to develop new materials with tunable and versatile sensing characteristics. Phase engineering of twodimensional materials to better utilize their physiochemical properties has attracted considerable attention. Here, we show that MoSe 2 phase-transition/CeO 2 composites can be effectively used to distinguish ammonia (NH 3 ) and triethylamine (TEA) at room temperature. The phase transition of nanocomposite samples from semimetallic (1T) to semiconducting (2H) prepared at different synthesis temperatures is confirmed via X-ray photoelectron spectroscopy (XPS). A composite sensor in which the 2H phase of MoSe 2 is predominant lacks discrimination capability and is less responsive to NH 3 and TEA. An MoSe 2 /CeO 2 composite sensor with a higher 1T phase content exhibits high selectivity for NH 3 , whereas one with a higher 2H phase content (2H > 1T) shows more selective behavior toward TEA. For example, for 50% relative humidity, the MoSe 2 /CeO 2 sensor's signal changes from the baseline by 45% and 58% for 1 ppm of NH 3 and TEA, respectively, indicating a low limit of detection (LOD) of 70 and 160 ppb, respectively. The composites' superior sensing characteristics are mainly attributed to their large specific surface area, their numerous active sites, presence of defects, and the n-n type heterojunction between MoSe 2 and CeO 2 . The sensing mechanism is elucidated using Raman spectroscopy, XPS, and GC−MS results. Their phase-transition characteristics render MoSe 2 /CeO 2 sensors promising for use in distributed, low-cost, and room-temperature sensor networks, and they offer new opportunities for the development of integrated advanced smart sensing technologies for environmental and healthcare.

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Section: Resultssupporting

confidence: 86%

Phase-Engineered MoSe₂/CeO₂ Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH₃ and TEA Gases

Singh,

Shin,

Moon

et al. 2024

ACS Sens.

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“…The electron beam passes through the sample, where some of the electrons are scattered or absorbed, while others are transmitted to a detector to produce a two-dimensional image of the internal structure of the sample. It combines inverse spatial diffraction, real-space imaging, and spectroscopic techniques for comprehensive characterization in the domains of time, space, momentum, and increasingly, energy, with excellent resolution [ 69 ]. SEM typically has a low resolution, generally in the nanometer to sub-nanometer range, while TEM, on the other hand, provides high-resolution images [ 47 ] that can reach sub-nanometer to atomic levels.…”

Section: Detection Techniques For Mps In Porous Mediamentioning

confidence: 99%

Research on the Migration and Adsorption Mechanism Applied to Microplastics in Porous Media: A Review

Zeng,

Yuan,

Xiang

et al. 2024

Nanomaterials

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In recent years, microplastics (MPs) have emerged as a significant environmental pollutant, garnering substantial attention for their migration and transformation behaviors in natural environments. MPs frequently infiltrate natural porous media such as soil, sediment, and rock through various pathways, posing potential threats to ecological systems and human health. Consequently, the migration and adsorption mechanisms applied to MPs in porous media have been extensively studied. This paper aims to elucidate the migration mechanisms of MPs in porous media and their influencing factors through a systematic review. The review encompasses the characteristics of MPs, the physical properties of porous media, and hydrodynamic factors. Additionally, the paper further clarifies the adsorption mechanisms of MPs in porous media to provide theoretical support for understanding their environmental behavior and fate. Furthermore, the current mainstream detection techniques for MPs are reviewed, with an analysis of the advantages, disadvantages, and applications of each technique. Finally, the paper identifies the limitations and shortcomings of current research and envisions future research directions.

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Chiral Inorganic Nanomaterials Characterized by Advanced TEM: A Qualitative and Quantitative Study

Chen,

Murakami

et al. 2024

Advanced Materials

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Chiral inorganic nanomaterials (CINMs) have garnered significant interest due to their exceptional optical, electronic, and catalytic properties, offering promising advancements in energy conversion, data storage, catalysis, and biomedicine. While traditional optical spectrophotometers reveal the chiroptical performance of CINMs on an ensemble level, the direct structural visualization for the qualitative and quantitative discernment of their chiral features has become increasingly distinct with the advancements of transmission electron microscopy (TEM) techniques. The need for reasonable and high‐standard discrimination requirements of CINMs has driven the progress of chirality‐based TEM technologies. Therefore, this review in the good season takes the initiative to summarize the current advancements in TEM technologies for CINMs characterization, emphasizing a qualitative analysis of chiral atomic‐level features, 0D, 1D, and 2D nanocrystals, and assembled nanomaterials. Then, the quantitative methods for determining chirality is also highlighted, such as 3D electron tomography, and further address the evolution of chiral structures monitored by the Ex‐situ and In‐situ TEM technologies. By providing a roadmap for the current challenges and proposing future advancements in TEM technologies for the qualitative, quantitative, and real‐time analysis of CINMs, it can drive innovations in the field of chiral nanomaterials as well as the development of TEM technologies.

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Applications of Transmission Electron Microscopy in Phase Engineering of Nanomaterials

Cited by 15 publications

References 203 publications

Phase-Engineered MoSe₂/CeO₂ Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH₃ and TEA Gases

Phase-Engineered MoSe₂/CeO₂ Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH₃ and TEA Gases

Research on the Migration and Adsorption Mechanism Applied to Microplastics in Porous Media: A Review

Chiral Inorganic Nanomaterials Characterized by Advanced TEM: A Qualitative and Quantitative Study

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Applications of Transmission Electron Microscopy in Phase Engineering of Nanomaterials

Cited by 15 publications

References 203 publications

Phase-Engineered MoSe2/CeO2 Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH3 and TEA Gases

Phase-Engineered MoSe2/CeO2 Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH3 and TEA Gases

Research on the Migration and Adsorption Mechanism Applied to Microplastics in Porous Media: A Review

Chiral Inorganic Nanomaterials Characterized by Advanced TEM: A Qualitative and Quantitative Study

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Phase-Engineered MoSe₂/CeO₂ Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH₃ and TEA Gases

Phase-Engineered MoSe₂/CeO₂ Composites for Room-Temperature Gas Sensing with a Drastic Discrimination of NH₃ and TEA Gases