Article
Chemistry, Multidisciplinary
Shuangyuan Pan, Min Hong, Lijie Zhu, Wenzhi Quan, Zehui Zhang, Yahuan Huan, Pengfei Yang, Fangfang Cui, Fan Zhou, Jingyi Hu, Feipeng Zheng, Yanfeng Zhang
Summary: This study reports the direct synthesis of mono- to few-layer Ni-tellurides, including 1T-NiTe2 and Ni-rich stoichiometric phases, on graphene/SiC substrates under ultra-high-vacuum conditions. Through atomic-scale scanning tunneling microscopy observations and density functional theory calculations, the researchers obtained detailed information about the phase modulation of Ni-tellurides and self-intercalated compounds. Additionally, the study also predicts the emergence of superconductivity in bilayer NiTe2 intercalated with 50% Ni.
Article
Metallurgy & Metallurgical Engineering
Shuhui Lv, Qiang Yang, Fanzhi Meng, Jian Meng
Summary: This study investigates the instantaneous reactions of Al, Mn, Zn, Zr, and Y with Ni to understand their mechanisms in removing Ni impurity. The results reveal the formation of Al4NiY and Al4Ni(Y,Zr) intermetallic phases, which efficiently remove Ni and settle at the bottom of the melt. Adding Y to Mg-Al based alloys also contributes to the removal of Fe and Ni, improving the alloys' corrosion resistance and strength.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Nanoscience & Nanotechnology
Benjamin Galy, Michael Musi, Muriel Hantcherli, Guy Molenat, Alain Couret, Petra Spoerk-Erdely, Helmut Clemens, Jean-Philippe Monchoux
Summary: In this study, dislocation velocities in metallic systems were measured at high temperatures, with simultaneous determination of the corresponding mechanism. Coupled experiments of in-situ TEM investigations and stereographic analyses were conducted in an intermetallic alloy, identifying both mixed climb and pure glide mechanisms. The results showed that within a transition temperature domain, mixed climb can reach the velocity of glide, with dislocation velocities in the same order of magnitude (0.5-5 nm/s).
SCRIPTA MATERIALIA
(2023)
Review
Chemistry, Multidisciplinary
Zuolong Chen, Xiyang Wang, Joel P. Mills, Cheng Du, Jintae Kim, John Wen, Yimin A. Wu
Summary: Electrochemical CO2 reduction is an efficient approach to achieve eco-friendly energy generation and environmental sustainability, with 2D materials as promising catalyst candidates. Understanding the fundamental reaction mechanisms in CO2 ECR is crucial, requiring advanced in situ and operando characterizations.
Article
Chemistry, Physical
Jayshri Dumbre, Shravan K. Kairy, Elaf Anber, Timothy Langan, Mitra L. Taheri, Thomas Dorin, Nick Birbilis
Summary: Scandium (Sc) containing Al-Si model alloys were heat-treated to form (Al,Si)(3)Sc phase at 350 degrees C and V-phase (AlSc2Si2) at above 450 degrees C. The hardening of the alloys was attributed to the coherent nanoscale (Al,Si)(3)Sc precipitates, while significant softening was observed due to the formation of coarse V-phase. The V-phase was found to have a rod morphology and six new orientation relationships with the alpha-Al matrix were determined using TEM.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Multidisciplinary
Andrzej M. Zak
Summary: This article provides a summary and critical review of all in situ experiments using light, discusses various technical possibilities for introducing radiation into transmission electron microscopy, and highlights the most important differences between the effects of light and electrons on studied matter. Furthermore, it summarizes the most promising directions for further research using light excitation.
Article
Materials Science, Multidisciplinary
Jin-Kyung Kim
Summary: Three deformation mechanisms of TWIP steels were observed by in-situ TEM mechanical testing: formation of deformation twins from grain boundaries, interference of growth of deformation twins by stacking faults, and motion of extended dislocations contributing to plasticity.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
Ruiyang You, Zhemin Wu, Jian Yu, Fei Wang, Shiyuan Chen, Zhong-kang Han, Wentao Yuan, Hangsheng Yang, Yong Wang
Summary: This study investigates the phase stability of Pd nanocrystals using Cs-corrected TEM, revealing that the newly formed Pd nanocrystals can adopt a metastable hexagonal phase. The research proposes a formation mechanism for the hexagonal Pd nanocrystals, involving the templating of graphite and size effect.
Article
Materials Science, Multidisciplinary
Nargisse Khiara, Fabien Onimus, Stephanie Jublot-Leclerc, Thomas Jourdan, Thomas Pardoen, Jean-Pierre Raskin, Yves Brechet
Summary: In-situ TEM straining experiments were conducted on pure copper to investigate the dislocation behavior under heavy ion irradiation and high applied stress levels. The unpinning of dislocations from irradiation defects followed by glide was observed, suggesting a cascade-related mechanism explaining radiation induced dislocation glide. This work provides new insights into irradiation creep deformation at high stress levels.
Article
Chemistry, Multidisciplinary
Chao Zhang, Anastasia V. Korovina, Konstantin L. Firestein, Joseph F. S. Fernando, Courtney-Elyce Lewis, Dmitry G. Kvashnin, Dmitri V. Golberg
Summary: The optoelectronic properties of free-standing few-atomic-layer black phosphorus nanoflakes are analyzed using in situ transmission electron microscopy (TEM). The band gap of black phosphorus (BP) is directly related to its thickness and strain, and can be tuned accordingly. Photocurrent measurements under TEM reveal stable response to infrared light and changes in band gap with deformation. Experimental results are further supported by density functional theory (DFT) calculations. These findings provide guidance for engineering the band gap of BP through controlling the number of atomic layers and programmed deformations for future optoelectronic applications.
Article
Materials Science, Multidisciplinary
Dongfeng Ma, Shengcheng Mao, Jiao Teng, Xinliang Wang, Xiaochen Li, Jin Ning, Zhipeng Li, Qing Zhang, Zhiyong Tian, Menglong Wang, Ze Zhang, Xiaodong Han
Summary: This study investigated the self-heating degradation behaviors of Pt thin films above 1000 degrees C at the nanoscale, revealing that voids mainly formed at grain boundaries and triple junctions, with local tensile stress promoting void nucleation at the Pt-SiNx interface. Mass transportation dominated by grain boundaries led to preferential void growth at grain boundaries and triple junctions in Pt films, while voids that nucleated inside Pt grains grew and accelerated film degradation under the influence of applied current.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Khuram Faraz, Thomas Grenier, Christophe Ducottet, Thierry Epicier
Summary: This paper presents an automatic procedure using deep learning and computer vision to track nanoparticles in ETEM, allowing for quantitative analysis of their evolution, motion, and catalytic properties.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Zichun Wang, Dan Wang, Ang Li, Lizhuo Wang, Xiaodong Han, Yijiao Jiang, Jianfeng Chen, Jun Huang
Summary: Metal nanowires, specifically Al nanowires, can be fabricated using Ni-catalyzed reduction of Al2O3 substrates. In this study, the growth dynamics of Al nanowires on Ni/Al2O3 were investigated using in situ transmission electron microscopy. The effects of alumina structures, compositions, and growth temperature were also examined. The findings provide insights into the dynamic change and catalytic performance of Ni/Al2O3 under working conditions, with potential applications beyond Al nanowire growth.
Article
Chemistry, Multidisciplinary
Fang Liu, Jiashen Meng, Hong Wang, Shulin Chen, Ruohan Yu, Peng Gao, Jinsong Wu
Summary: This study reveals the phase transformations and electrochemical mechanism of tellurium (Te) in potassium-ion batteries (PIBs) using in situ high-resolution transmission electron microscopy and electron diffraction. The results show that the potassium storage in Te is highly reversible, providing implications for the future design of high-performance nanostructured cathodes for PIBs.
Review
Chemistry, Multidisciplinary
Gabriel C. Halford, Michelle L. Personick
Summary: Prospective applications in the electrification of industrial chemical processes and the conversion of electrical energy to chemical fuels, as part of the transition to renewable energy sources, require tailored nanostructures on electrode surfaces. Colloidal methods for producing shaped nanoparticles in solution are abundant, but challenges remain in designing novel syntheses for sustainable technological advances and uniformly dispersing colloidally synthesized nanostructures on electrodes. Electrochemical nanoparticle synthesis, driven by applied current or potential, offers promise for fabricating nanostructured electrodes. This Account explores the interplay between colloidal and electrochemical approaches and the potential for future development.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
