Xuezeng TianChinese Academy of Sciences | CAS · Institute of Physics
Xuezeng Tian
Doctor of Philosophy
About
64
Publications
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Introduction
Tian Xuezeng currently works as an associate professor at the Institute of Physics, Chinese Academy of Sciences. His main research interests include 3D atomic electron tomography, 4D-STEM, in situ TEM and their application to physical/material sciences.
Tian has lots experience on both experimental and theoretical Electron Microscopy, including in situ/ex situ TEM, multislice simulation and 3D reconstruction algorithms.
Additional affiliations
October 2020 - present
December 2016 - September 2020
September 2014 - November 2016
Education
September 2005 - July 2009
Publications
Publications (64)
Solid electrolyte based-resistive memories have been considered to be a potential candidate for future information technology with applications in non-volatile memory, logic circuits and neuromorphic computing. A conductive filament model has been generally accepted to be the underlying mechanism for the resistive switching. However, the growth dyn...
The cathodoluminescence spectrum of single zinc oxide (ZnO) nanowires is measured by in-situ optical Transmission Electron Microscope. The coupling between exciton and longitudinal optical phonon is studied. The band edge emission varies for different excitation spots. This effect is attributed to the exciton propagation along the c axis of the nan...
Getting a grip on the switching mechanism in nanoionic resistive memories: the bipolar electrochemical mechanism for mass transfer of Ag in nanoscale SiO2 is disclosed. The in-situ atomic-level experiments provide detailed evidence of the mass-transfer process under external electric fields. The mass transfer of Ag directly leads to conductive fila...
Graphite is a cornerstone material in heat dissipation due to its exceptionally high in-plane thermal conductivity (~ 2000 W m − 1 K − 1 ). However, its low through-plane thermal conductivity remains a bottleneck for heat dissipation, typically limited to 5–9 W m − 1 K − 1 . Here we reveal that graphite, when structure is optimized, delivers a reco...
Atomic chalcogen vacancy is the most commonly observed defect category in two dimensional (2D) transition‐metal dichalcogenides, which can be detrimental to the intrinsic properties and device performance. Here a low‐defect density, high‐uniform, wafer‐scale single crystal epitaxial technology by in situ oxygen‐incorporated “growth‐repair” strategy...
Multiferroic materials, which simultaneously exhibit ferroelectricity and magnetism, have attracted substantial attention due to their fascinating physical properties and potential technological applications. With the trends towards device miniaturization, there is an increasing demand for the persistence of multiferroicity in single-layer material...
Multiferroic materials, which simultaneously exhibit ferroelectricity and magnetism, have attracted substantial attention due to their fascinating physical properties and potential technological applications. With the trends towards device miniaturization, there is an increasing demand for the persistence of multiferroicity in single-layer material...
Cu-oxide-based catalysts are promising for CO2 electroreduction (CO2RR) to CH4, but suffer from inevitable reduction (to metallic Cu) and uncontrollable structural collapse. Here we report Cu-based rock-salt-ordered double perovskite oxides with superexchange-stabilized long-distance Cu sites for efficient and stable CO2-to-CH4 conversion. For the...
Composite structures integrated with metasurfaces and nonlinear films have emerged as alternative candidates to enhance nonlinear response. The cooperative interaction between the two components is complicated. Herein, a split-ring resonator (SRR)-type metasurface was fabricated on a free-standing nanocrystal diamond (NCD) film utilizing electron b...
Chiromagnetic Co(OH) 2 nanoparticles with tunable asymmetry g -factors achieve AA chiral recognition and nM-level concentration detection.
Ice is present everywhere on Earth and has an essential role in several areas, such as cloud physics, climate change and cryopreservation. The role of ice is determined by its formation behaviour and associated structure. However, these are not fully understood¹. In particular, there is a long-standing debate about whether water can freeze to form...
Knowledge of the atomic structure of materials is critical to understanding their functionality in many fields such as biology, microelectronics, condensed matter, and nanotechnology. Traditionally, x-ray crystallography has been the main method used to solve structures of all types. New techniques such as micro electron diffraction and single part...
In‐situ socketing metal nanoparticles onto perovskite oxides has shown great potential in heterogeneous catalysis, but its employment in boosting ambient CO2 electroreduction (CER) is unexplored. Here we construct a CER catalyst of perovskite‐socketed sub‐3 nm Cu equipped with strong metal‐support interactions (SMSIs) to promote efficient and stabl...
Layered transition-metal chalcogenide material (TMD) offers a platform to investigate two-dimensional (2D) superconductivity. Here, we report an electrical transport study of 2D centrosymmetric superconductor 1T′−WS2. For a typical five-layer sample, the 2D superconductivity is revealed in Berezinskii-Kosterlitz-Thouless (BKT) transition with the c...
Attention toward aqueous zinc-ion battery has soared recently due to its operation safety and environmental benignity. Nonetheless, dendrite formation and side reactions occurred at the anode side greatly hinder its practical application. Herein, we adopt direct plasma-enhanced chemical vapor deposition strategy to in situ grow N-doped carbon (NC)...
We report an effective strategy to enhance CO2 electroreduction (CER) properties of Cu‐based Ruddlesden–Popper (RP) perovskite oxides by engineering their A‐site cation deficiencies. With La2−xCuO4‐δ (L2−xC, x=0, 0.1, 0.2, and 0.3) as proof‐of‐concept catalysts, we demonstrate that their CER activity and selectivity (to C2+ or CH4) show either a vo...
Achieving large-size two-dimensional (2D) crystals is key to fully exploiting their remarkable functionalities and application potentials. Chemical vapor deposition growth of 2D semiconductors such as monolayer MoS2 has been reported to be activated by halide salts, for which various investigations have been conducted to understand the underlying m...
Here we report an effective strategy to enhance CO2 electroreduction (CER) properties of Cu‐based Ruddlesden‐Popper (RP) perovskite oxides by engineering their A‐site cation deficiencies. With La2‐xCuO4‐δ (L2‐xC, x = 0, 0.1, 0.2, and 0.3) as proof‐of‐concept catalysts, we demonstrate that their CER activity and selectivity (to C2+ or CH4) show eith...
The three-dimensional (3D) local atomic structures and crystal defects at the interfaces of heterostructures control their electronic, magnetic, optical, catalytic, and topological quantum properties but have thus far eluded any direct experimental determination. Here, we use atomic electron tomography to determine the 3D local atomic positions at...
Significance
Manipulating materials with atomic-scale precision is essential for the development of a next-generation material design toolbox. Tremendous efforts have been made to advance the compositional, structural, and spatial accuracy of material deposition and patterning. Here, we presented a new reaction pathway to implement the conversions...
The 3D local atomic structures and crystal defects at the interfaces of heterostructures control their electronic, magnetic, optical, catalytic and topological quantum properties, but have thus far eluded any direct experimental determination. Here we determine the 3D local atomic positions at the interface of a MoS2-WSe2 heterojunction with picome...
Amorphous solids such as glass, plastics and amorphous thin films are ubiquitous in our daily life and have broad applications ranging from telecommunications to electronics and solar cells1–4. However, owing to the lack of long-range order, the three-dimensional (3D) atomic structure of amorphous solids has so far eluded direct experimental determ...
Achieving large-size two-dimensional (2D) crystals is key to fully exploiting their remarkable functionalities and application potentials. Chemical vapor deposition (CVD) growth of 2D semiconductors such as monolayer MoS2 has been reported to be activated by halide salts, yet clear identification of the underlying mechanism remains elusive. Here we...
To broaden the scope of van der Waals 2D magnets, we report the synthesis and magnetism of covalent 2D magnetic Cr$_2$Te$_3$ with a thickness down to one-unit-cell. The 2D Cr$_2$Te$_3$ crystals exhibit robust ferromagnetism with a Curie temperature of 180 K, a large perpendicular anisotropy of 7*105 J m-3, and a high coercivity of ~ 4.6 kG at 20 K....
To broaden the scope of van der Waals 2D magnets, we report the synthesis and magnetism of covalent 2D magnetic Cr2Te3 with a thickness down to one-unit-cell. The 2D Cr2Te3 crystals exhibit robust ferromagnetism with a Curie temperature of 180 K, a large perpendicular anisotropy of 7 × 10⁵ J m⁻³, and a high coercivity of ∼4.6 kG at 20 K. First prin...
A Correction to this paper has been published: https://doi.org/10.1038/s41467-020-20151-x
Manipulating materials with atomic-scale precision is essential for the development of next-generation material design toolbox. Tremendous efforts have been made to advance the compositional, structural, and spatial accuracy of material deposition and patterning. The family of 2D materials provides an ideal platform to realize atomic-level material...
Through numerical simulations, we demonstrate the combination of ptychography and atomic electron tomography as an effective method for low dose imaging of individual low-Z atoms in three dimensions. After generating noisy diffraction patterns with multislice simulations of an aberration-corrected scanning transmission electron microscope through a...
Properties of semiconductors are largely defined by crystal imperfections including native defects. Van der Waals (vdW) semiconductors, a newly emerged class of materials, are no exception: defects exist even in the purest materials and strongly affect their electrical, optical, magnetic, catalytic and sensing properties. However, unlike convention...
Amorphous solids such as glass are ubiquitous in our daily life and have found broad applications ranging from window glass and solar cells to telecommunications and transformer cores 1,2 . However, due to the lack of long-range order, the three-dimensional (3D) atomic structure of amorphous solids have thus far defied any direct experimental deter...
The electronic, optical and chemical properties of two-dimensional transition metal dichalcogenides strongly depend on their three-dimensional atomic structure and crystal defects. Using Re-doped MoS2 as a model system, here we present scanning atomic electron tomography as a method to determine three-dimensional atomic positions as well as positio...
Atomic Electron Tomography: Past, Present and Future - Jianwei Miao, Xuezeng Tian, Dennis Kim, Jihan Zhou, Yongsoo Yang, Yao Yang, Yakun Yuan, Colin Ophus, Andreas Schmid, Shize Yang, Fan Sun, Christopher Ciccarino, Blake Duschatko, Juan-Carlos Idrobo, Prineha Narang, Hao Zeng, Peter Ercius
Imaging Nucleation, Growth and Disorder at the Single-atom Level by Atomic Electron Tomography (AET) - Peter Ercius, Jihan Zhou, Yongsoo Yang, Yao Yang, Dennis Kim, Andrew Yuan, Xuezeng Tian, Colin Ophus, S Zhu, Andreas Schmid, Michael Nathanson, Hendrik Heinz, Qi An, Hao Zeng, Jianwei Miao
Properties of semiconductors are largely defined by crystal imperfections including native defects. Van der Waals (vdW) semiconductors, a newly emerged class of materials, are no exception: defects exist even in the purest materials and strongly affect their electrical, optical, magnetic, catalytic and sensing properties. However, unlike convention...
Amorphous solids such as glass are ubiquitous in our daily life and have found broad applications ranging from window glass and solar cells to telecommunications and transformer cores. However, due to the lack of long-range order, the three-dimensional (3D) atomic structure of amorphous solids have thus far defied any direct experimental determinat...
4D Atomic Electron Tomography - Volume 25 Supplement - Jianwei Miao, Jihan Zhou, Yongsoo Yang, Yao Yang, Dennis S. Kim, Andrew Yuan, Xuezeng Tian, Colin Ophus, Fan Sun, Andreas K. Schmid, Michael Nathanson, Hendrik Heinz, Qi An, Hao Zeng, Peter Ercius
Determining the 3D Atomic Coordinates and Crystal Defects in 2D Materials with Picometer Precision - Volume 25 Supplement - Xuezeng Tian, Dennis S. Kim, Shize Yang, Christopher J. Ciccarino, Yongji Gong, Yongsoo Yang, Yao Yang, Blake Duschatko, Yakun Yuan, Pulickel M. Ajayan, Juan-Carlos Idrobo, Prineha Narang, Jianwei Miao
3D Structure Determination of Pt-based Nanocatalysts at Atomic Resolution - Volume 25 Supplement - Yao Yang, Jihan Zhou, Yongsoo Yang, Zipeng Zhao, Dennis S. Kim, Xuezeng Tian, Colin Ophus, Jim Ciston, Peter Ercius, Yu Huang, Jianwei Miao
Nucleation plays a critical role in many physical and biological phenomena that range from crystallization, melting and evaporation to the formation of clouds and the initiation of neurodegenerative diseases1–3. However, nucleation is a challenging process to study experimentally, especially in its early stages, when several atoms or molecules star...
Two-dimensional (2D) materials and heterostructures exhibit exceptional electronic, optical and chemical properties, promising to find applications ranging from electronics and photovoltaics to quantum information science. However, the exceptional properties of these materials strongly depend on their 3D atomic structure especially crystal defects....
AgCl nanocrystals demonstrate spontaneous reshaping and splitting, as imaged via liquid cell transmission electron microscopy. In article number 1803231, Haimei Zheng and co‐workers show that, under electron beam irradiation, all AgCl nanocrystals maintain a single crystalline structure while simultaneously exhibiting liquid‐like behaviors. The dyn...
AgCl is photosensitive and thus often used as micromotors. However, the dynamics of individual AgCl nanoparticle motion in liquids upon illumination remains elusive. Here, using liquid cell transmission electron microscope (TEM), AgCl nanocrystals reshaping and splitting spontaneously in an aqueous solution under electron beam illumination are obse...
Atomic Electron Tomography: Adding a New Dimension to See Single Atoms in Materials - Volume 24 Supplement - Jianwei Miao, Yongsoo Yang, Jihan Zhou, Xuezeng Tian, Yao Yang, Dennis S. Kim, Alan Pryor, Peter Ercius, Colin Ophus, M. C. Scott, Chien-Chun Chen, Wolfgang Theis, Markus Eisenbach, Paul R. C. Kent, Renat F. Sabirianov, Hao Zeng
Nucleation plays a critical role in many physical and biological phenomena ranging from crystallization, melting and evaporation to the formation of clouds and the initiation of neurodegenerative diseases. However, nucleation is a challenging process to study especially in the early stage when several atoms/molecules start to form a new phase from...
The dynamics of molecules or nanoparticles (NPs) at solid-liquid interfaces plays an important role in many natural and industrial processes. However, the effect of solid surface at solid-liquid interface on NP motion and interaction between these NPs is still not well understood. Here, using in situ liquid cell transmission electron microscopy (TE...
The development of efficient non-noble metal electrocatalysts for oxygen reduction reaction (ORR) is still highly desirable before non-noble metal catalysts can replace platinum catalysts. Herein, we have synthesized a new type of ORR catalyst, Co3(PO4)2C-N/rGOA, containing N-coordinated cobalt phosphate by thermal treatment of phosphonate-based me...
div class="title">Real time observation of gold nanoparticle aggregation dynamics on a 2D membrane
- Volume 22 Issue S3 - Xuezeng Tian, Haimei Zheng, Paul Thomas Matsudaira, Utkur Mirsaidov
The predicted extraordinary properties of carbon nanotubes (CNTs) from theoretical calculations have great potential for many applications. However, reliable experimental determination of intrinsic properties at the single-tube level is currently a matter of concern, and many challenges remain because of the unhandled and nanoscale size of individu...
div class="title">The Two Dimensional Nanoplate Dynamics Revealed by in situ Liquid Cell TEM
- Volume 21 Issue S3 - Xuezeng Tian, Jingyu Lu, Zainul Aabdin, Utkarsh Anand, Utkur M. Mirsaidov, Haimei Zheng
We report that gold nanocrystals can be prepared from vapor phase using chloroauric acid (HAuCl4) as the precursor. By tuning the vapor-phase deposition parameters, the size and space distribution of the gold nanocrystals can be well controlled on substrates. Systematic control experiments demonstrate that intermediate AuCl and AuCl3 products pyrol...
Few-layer graphene was successfully tailored with smooth edges along crystallographic directions by Joule heating-driven tungsten nanoparticles inside a transmission electron microscope. The dynamic process was monitored in real time at the atomic resolution level. These high-resolution in-situ observations show that the neighboring graphene layers...
Nanostructured silicon anodes, which possess extremely high energy density and accommodate large strain without pulverization, have been developed rapidly for high-power lithium ion batteries. Here, using in situ transmission electron microscopy, the lithiation behavior of silicon nanowires with diameters smaller than 60 nm was investigated. The st...
Defect engineering in graphene is important for tailoring graphene's properties thus applicable in various applications such as porous membranes and ultra-capacitors. In this paper, we report a general route towards defect- and pore- engineering in graphene through remote plasma treatments. Oxygen plasma irradiation was employed to create homogenou...
We report a scalable growth of monolayer MoS2 films on SiO2 substrates by chemical vapor deposition. As-grown polycrystalline MoS2 films are continuous over the entire substrate surface with a tunable domain size from ~20nm up to ~1μm. An obvious blue-shift (up to 80meV) of photoluminescence peaks was observed from a series samples with different d...
Resistive switching random access memories (RRAM) have been considered to be promising for future information technology with applications for non-volatile memory, logic circuits and neuromorphic computing. Key performances of those resistive devices are approaching the realistic levels for production. In this paper, we review the progress of valen...
Fading mechanism of tin dioxide (SnO2) electrodes in lithium ion batteries has attracted much attentions, which is of great importance for the battery applications. In this paper, electrochemical lithiation-delithiation cycles of individual SnO2 nanowires were conducted in situ in a high-resolution transmission electron microscopy (TEM). Major chan...
Piezotronics is a new field integrating piezoelectric effect into nanoelectronics, which has attracted much attention for the fundamental research and potential applications. In this paper, the piezotronic effect of zinc oxide (ZnO) nanowires, including the response of the electrical transport and photoconducting behaviors on the nanowire bending,...
Silicon nanowires (SiNWs) are promising building blocks for future electronic devices. In SiNW-based devices, reducing the contact resistance of SiNW-metal as much as possible is critically important. Here we report a simple fabrication approach for SiNW field effect transistors (FETs) with low contact resistances by employing a heavily doped carri...
The electromechanical resonances of individual zinc oxide nanowires were induced by alternative current (ac) signals inside a transmission electron micrcrope, which have been used to measure the mechanical quality factors (Q) and elastic bending moduli (E) of a single zinc oxide (ZnO) nanowire. The resonance amplitudes were tuned by the applied ac...