Article
Engineering, Environmental
Bei Liu, Qi Han, Li Li, Sunxiang Zheng, Yufei Shu, Joel A. Pedersen, Zhongying Wang
Summary: The aggregation behavior of single-layer MoS2 nanosheets is influenced by cations in environmental conditions, with trivalent cations having a smaller impact compared to divalent and monovalent cations. Visible light irradiation also accelerates the aggregation process of nanosheets, even in the presence of natural organic matter.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Jianmei Chen, Yanping Lin, Hao Wang, Jianmin Li, Shujuan Liu, Jong. Min Lee, Qiang Zhao
Summary: This review provides a comprehensive overview of the recent advances in the synthesis and modulation of 2D Mo compounds for applications in electrocatalytic energy conversion, and discusses various atomic/plane/synergistic engineering strategies, as well as catalytic optimization in the electrochemical process that involves the cycles of water, carbon, and nitrogen.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiulong Li, Linda M. Guiney, Julia R. Downing, Xiang Wang, Chong Hyun Chang, Jinhong Jiang, Qi Liu, Xiangsheng Liu, Kuo-Ching Mei, Yu-Pei Liao, Tiancong Ma, Huan Meng, Mark C. Hersam, Andre E. Nel, Tian Xia
Summary: 2D boron nitride (BN) and molybdenum disulfide (MoS2) materials have novel chemical, electronic, and optical properties, but recent research has shown potential hazards of MoS2 under certain biological conditions. MoS2 induces dose-dependent cytotoxicity in Kupffer cells (KCs), while the BN derivatives are non-toxic. The toxicity of MoS2 is attributed to nanosheet dissolution and the release of hexavalent Mo, leading to mitochondrial reactive oxygen species generation and apoptosis in KCs. Further, the phagocytosis of MoS2 aggregates triggers a separate response pathway involving lysosomal damage, NLRP3 inflammasome activation, and cytokine production.
Article
Chemistry, Physical
Yu Xia, Jiaming Liu, Xingchu Zhang, Renlong Zhou
Summary: Research findings show that laser energy absorption and field evaporation mechanisms can be described by an effective cross section, while the fluctuation of charge state is influenced by collective excitation of electrons. The average charge state is only dependent on the static field strength.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Energy & Fuels
Derya Oncel Ozgur
Summary: This work presents a novel nickel@nitrogen-doped graphene@MoS2 (Ni@N-Gr/ MoS2) triad heterostructure for catalytic HER. The as-synthesized Ni@N-Gr/MoS2 assembly exhibits high intrinsic HER activity and stability, thanks to the incorporation of Ni@N-Gr in the basal plane of MoS2 and the improvement of conductivity by nitrogen-doped graphene.
Article
Chemistry, Multidisciplinary
Volodymyr B. Koman, Xun Gong, Naveed A. Bakh, Kevin Silmore, Daniel P. Salem, Tedrick Thomas Salim Lew, Matthias Kuehne, Daichi Kozawa, Minkyung Park, Michael S. Strano
Summary: This study develops a novel sensing platform using MoS2 monolayers as 2D sensing interfaces to assess molecular transport through cell layers with subcellular spatial resolution. The technique allows spatial imaging of molecular permeability and detection of nanoscale cellular junctions.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Han Li, Yating Ma, Zhongjie Xu, Xiang'ai Cheng, Tian Jiang
Summary: This study observed anomalous interlayer coupling and giant PL enhancement in artificially twisted bilayers of MoS2, laying the groundwork for future advancements and applications beyond TMDCs monolayers.
Article
Nanoscience & Nanotechnology
Malgorzata Aleksandrzak, Martyna Baca, Michal Pacia, Karolina Wenelska, Beata Zielinska, Ryszard J. Kalenczuk, Ewa Mijowska
Summary: The study presents the photocatalytic activity of molybdenum disulfide structures with different dimensions functionalized with polymeric carbon nitride in the photocatalytic water splitting reaction. Quantum dots functionalized with PCN exhibited the highest photocatalytic efficiency compared to other MoS2 structures due to effective separation of electron-hole pairs, enhanced up-converted photoluminescence, and the highest reactivity of electrons in the conduction band.
Article
Chemistry, Multidisciplinary
Ching-Hsiang Fan, Hong-Chieh Tsai, Yi-Sheng Tsai, Hsien-Chu Wang, Yu-Chun Lin, Po-Han Chiang, Nan Wu, Min-Hwa Chou, Yi-Ju Ho, Zong-Hong Lin, Chih-Kuang Yeh
Summary: This study investigates the use of MoS2 NS to convert ultrasound energy into localized electrical stimulation for neural activation. The results demonstrate that a single pulse of ultrasound can effectively stimulate cells surrounding MoS2 NS without causing cellular damage. The proportion of responsive cells is influenced by the acoustic pressure, number of ultrasound cycles, and concentration of MoS2 NS. This method shows high spatial precision and potential for selective modulation of targeted brain circuits.
Article
Chemistry, Physical
Daniel S. Mosiman, Yi-Sheng Chen, Limei Yang, Brian Hawkett, Simon P. Ringer, Benito J. Marinas, Julie M. Cairney
Summary: Two techniques were developed to encapsulate and prepare HAP NPs into APT tips for characterization, revealing significant tradeoffs between encapsulant methods/materials for HAP characterization and the need for further technique development to select a more robust approach. This work serves as an essential starting point for advancing knowledge about the nanoscale spatiochemistry of HAP NPs.
Review
Engineering, Chemical
Christopher Igwe Idumah
Summary: The emergence of nanotechnology has prompted the search for new 2-D nanomaterials that can surpass the advantages of graphene, leading to the discovery of molybdenum disulfide (MoS2). MoS2 is a 2-D sheet-like nanomaterial with unique layered structure and similar chemical, electronic, and optical properties to graphene, expanding its applications in transistors, solar cells, catalysts, sensors, etc. Incorporating MoS2 into polymeric substrates has resulted in the development of MoS2 polymer nanoarchitectures with superior mechanical, thermal, and flame retardant features, offering versatile applications. Therefore, this elucidation discusses emerging research activities in MoS2 polymeric nanoarchitectures and their multifaceted applications.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Nianshuang Qiu, Zhuang Shen, Xiaowei Zuo, Gang Zhou
Summary: The addition of Mo atoms can significantly increase the hardness effect of high-strength steels, while also slowing down the coarsening process of co-precipitates, demonstrating potential high thermostability.
MATERIALS CHARACTERIZATION
(2021)
Article
Biophysics
Xue Tang, Chunfeng Lu, Xingxing Xu, Zihan Ding, Huiyue Li, Huijuan Zhang, Yanying Wang, Chunya Li
Summary: A visible and near-infrared light dual-responsive aptasensor was developed for accurate determination of prostate-specific antigen (PSA) using MoS2 nanoflowers and gold nanobipyramids. The aptasensor exhibited signal-off and signal-on responses, providing a wide linear range and low detection limits for PSA determination. Clinical serum samples were successfully analyzed with satisfactory selectivity and excellent accuracy using this dual-responsive aptasensor.
BIOSENSORS & BIOELECTRONICS
(2022)
Review
Chemistry, Physical
Saeed Sovizi, Robert Szoszkiewicz
Summary: This review presents the structural changes of MoS2 induced by various single atom dopants and their potential applications in energy storage, catalysis, sensing, etc. High resolution scanning transmission electron microscopy and scanning probe microscopy techniques have been used to study the dopant positions and sub-atomic structural changes in MoS2.
SURFACE SCIENCE REPORTS
(2022)
Article
Chemistry, Physical
Srinivaas Masimukku, Dai-Ling Tsai, Yuan -Ting Lin, I-Ling Chang, Jih-Jen Wu
Summary: MoS2-carbon nitride heterostructures, highly sensitive to low-frequency vibration, serve as catalysts for piezo-photocatalytic hydrogen evolution reaction (HER). The arrangement of MoS2 nano-structure on carbon nitride is crucial for the HER activity of the heterostructure. By adding Pt NPs as cocatalysts on carbon nitride, the 2D-2D stacked MoS2-carbon nitride catalyst exhibits a significantly higher HER rate compared to pristine carbon nitride and MoS2 NF-carbon nitride catalysts under illumination coupled with mechanical energy. The MoS2 nanosheets generate piezopotential and induce an electric field in the carbon nitride, inhibiting recombination of photogenerated electron-hole pairs and boosting the HER rate in the heterostructure.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Siyang Wang, James O. Douglas, Edmund Lovell, Neil Wilson, Liya Guo, Baptiste Gault, Mary P. Ryan, Finn Giuliani
Summary: La(Fe,Mn,Si)13-based magnetocaloric materials are promising for near-room temperature magnetic refrigeration. Their functional and mechanical properties depend on their chemistry, which is difficult to control at microstructural interfaces. Atom probe tomography revealed strong Mn segregation and off-1:13 stoichiometry at the phase and grain boundaries, respectively. Strategies to mitigate these negative effects are discussed to achieve durable and efficient operation of magnetic cooling devices.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Ruben Bueno Villoro, Maxwell Wood, Ting Luo, Hanna Bishara, Lamya Abdellaoui, Duncan Zavanelli, Baptiste Gault, Gerald Jeffrey Snyder, Christina Scheu, Siyuan Zhang
Summary: Complex microstructures in thermoelectric materials can be utilized to optimize their transport properties. In TiCoSb half Heusler compounds, Fe-dopants segregate to grain boundaries, increasing the electrical conductivity and reducing the thermal conductivity. The electrical conductivity of the grain interior and boundaries is calculated, and the atomic structure of grain boundaries is studied. Segregation engineering in fine-grained thermoelectrics is proposed as a new design tool to optimize transport properties while achieving a lower thermal conductivity.
Article
Materials Science, Multidisciplinary
T. S. Prithiv, Baptiste Gault, Yujiao Li, Dustin Andersen, Nathalie Valle, Santhana Eswara, Dirk Ponge, Dierk Raabe
Summary: The addition of boron (B) to steels significantly suppresses the austenite to ferrite phase transformation, increasing their hardenability. The mechanisms of B segregation and how exactly B suppresses the ferrite nucleation remain elusive.
Article
Materials Science, Multidisciplinary
Baptiste Gault, Heena Khanchandani, Thoudden Sukumar Prithiv, Stoichko Antonov, T. Ben Britton
Summary: Measuring local chemistry of specific crystallographic features by atom probe tomography (APT) is aided by transmission Kikuchi diffraction (TKD), but the potential structural damage caused by TKD is often ignored. Two case studies demonstrate damage in APT specimens from TKD mapping. The damage includes planar segregation of solutes and the formation of voids containing high concentrations of a specific element.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
James O. Douglas, Michele Conroy, Finn Giuliani, Baptiste Gault
Summary: Workflows have been developed in the past decade to enable atom probe tomography analysis at cryogenic temperatures. The inability to control the local deposition of the metallic precursor from the gas-injection system (GIS) at cryogenic temperatures makes the preparation of site-specific specimens by using lift-out extremely challenging in the focused-ion beam. Schreiber et al. exploited redeposition to weld the lifted-out sample to a support.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Felipe F. Morgado, Leigh Stephenson, Loic Rousseau, Francois Vurpillot, Simon Evertz, Jochen M. Schneider, Baptiste Gault
Summary: In this study, a chemically resolved atomic resolution imaging technique is developed by combining the atomic spatial resolution of field ion microscopy with the time-of-flight spectrometry of atom probe tomography. By implementing specialized flight path corrections and filtering algorithms, the performance of the technique is improved, leading to a significant increase in signal-to-background ratio. This technique not only enables the differentiation and identification of isotopes in pure tungsten, but also allows for elemental identification in non-metallic materials and binary alloys.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Se-Ho Kim, Leigh T. Stephenson, Torsten Schwarz, Baptiste Gault
Summary: This study compared the distribution of constituent elements in two different smartphone glass samples using X-ray spectroscopy techniques and atom probe tomography (APT). The results demonstrated that APT can be considered as an alternative technique for imaging the chemical distribution in glass for mobile applications.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Multidisciplinary Sciences
Xuyang Zhou, Ali Ahmadian, Baptiste Gault, Colin Ophus, Christian H. Liebscher, Gerhard Dehm, Dierk Raabe
Summary: Grain boundaries, the defects between differently oriented crystals, play an important role in solute segregation and material properties. The interplay of structure and composition of grain boundaries at the atomic level remains unclear. Through charge-density imaging and atom probe tomography, the authors reveal that the atomic motifs control the chemical properties of grain boundaries and enable the targeted design and passivation for various applications.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yan Ma, Jae Wung Bae, Se-Ho Kim, Matic Jovicevic-Klug, Kejiang Li, Dirk Vogel, Dirk Ponge, Michael Rohwerder, Baptiste Gault, Dierk Raabe
Summary: The authors demonstrate a method of sustainable steel production by reducing solid iron oxides with hydrogen released from ammonia. Ammonia, which can be synthesized with green hydrogen and release hydrogen again through the reduction reaction, connects with green iron making as a replacement for fossil reductants. The study shows that ammonia-based reduction of iron oxide is as effective as hydrogen-based direct reduction, and can be implemented industrially with existing technologies.
Article
Chemistry, Physical
Leonardo Shoji Aota, Chanwon Jung, Siyuan Zhang, Se-Ho Kim, Baptiste Gault
Summary: Pd-based electro-catalysts play a crucial role in enhancing the methanol oxidation reaction kinetics in alcohol fuel cells, but their performance degrades over time. Scanning electron microscopy and atom probe tomography were used to investigate the chemical changes at the microstructural/atomic scale responsible for this effect after accelerated degradation tests. No morphological changes were observed after 1000 MOR cycles, but leaching of Pd and B from PdAu nanoparticles and the formation of Au-rich regions on the catalyst's surface were identified. These insights underscore the importance of understanding the chemical modifications during MOR for the design of new catalysts.
ACS ENERGY LETTERS
(2023)
Article
Physics, Multidisciplinary
Loic Rousseau, Antoine Normand, Felipe F. Morgado, Hanne-Sofie Marie Scisly Soreide, Leigh T. Stephenson, Constantinos Hatzoglou, Gerald Da Costa, Kambiz Tehrani, Christoph Freysoldt, Baptiste Gault, Francois Vurpillot
Summary: We demonstrate that information on the chemical and bonding states of atoms in a material can be accessed using straight-flight-path atom probe tomography experimental data, but it requires additional processing. We develop a data processing approach called evaporation energy loss spectroscopy (FEELS), which involves an activation energy model and DFT simulations, to quantify the ion energy loss associated with the field evaporation process and reconstruct the original bond framework of the atoms on the surface. We apply FEELS to analyze microstructural features and defects in a range of metallic materials and discuss its general applicability to atom probe data sets.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Mathias Kraemer, Bar Favelukis, Ayman A. El-Zoka, Maxim Sokol, Brian A. Rosen, Noam Eliaz, Se-Ho Kim, Baptiste Gault
Summary: A study reveals the presence of alkali and halogen elements, as well as unetched aluminum in MXenes materials, which are often overlooked when considering the activity and performance.
ADVANCED MATERIALS
(2023)
Article
Geochemistry & Geophysics
Renelle Dubosq, David A. Schneider, Alfredo Camacho, Baptiste Gault
Summary: The deformation mechanisms of garnet in the brittle-ductile regime under lower crustal conditions are still unclear. A study on garnet porphyroclasts from an eclogite facies mylonite in central Australia reveals that Fe segregation along grain boundaries of garnet leads to the nucleation of Fe-rich nanoclusters, which act as barriers for migrating dislocations, resulting in strain hardening and mechanical failure.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Eric Woods, Mahander P. Singh, Se-Ho Kim, Tim M. Schwarz, James O. Douglas, Ayman A. El-Zoka, Finn Giulani, Baptiste Gault
Summary: This study focuses on the challenges of preparing cryogenic specimens for atom probe tomography (APT), and presents a generalized workflow for cryogenic specimen preparation. The workflow includes lift-out via focused ion beam and in situ deposition of capping layers to strengthen specimens and protect them during transfer. The study demonstrates the reliable in situ deposition of a metallic capping layer and showcases its significant improvement in atom probe data quality.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Chemistry, Physical
Su-Hyun Yoo, Leonardo Shoji Aota, Sangyong Shin, Ayman A. El-Zoka, Phil Woong Kang, Yonghyuk Lee, Hyunjoo Lee, Se-Ho Kim, Baptiste Gault
Summary: The introduction of interstitial dopants offers a new approach to optimize the catalytic activity of nanoparticles. However, the stability of a property-enhancing dopant (B) introduced in the controlled synthesis of a Pd aerogel electrocatalyst is significantly reduced after the hydrogen oxidation reaction. First-principles calculations suggest that the presence of H on the surface leads to the departure of subsurface B from the Pd nanostructure. This destabilization of subsurface B is more pronounced with increased H occupation of surface and interstitial sites. Thus, H2 fuel itself promotes the microstructural degradation and activity drop of the electrocatalyst.
ACS ENERGY LETTERS
(2023)
