News
Showing 49 results for Researcher: Kai Xiao
-
November 10, 2023
2 MIN READ
High-speed Mapping of Surface Charge Dynamics using Sparse Scanning Kelvin Probe Force Microscopy (SS-KPFM)
February 10, 2023
1 MIN READ
Real-time spectroscopy enables precision synthesis of metastable 2D materials
Scientific Achievement: The kinetic pathways of Janus monolayer formation were revealed by real-time Raman spectroscopy combined with plasma plume diagnostics during pulsed laser deposition (PLD), allowing the capture of 2D metastable alloys.Significance and Impact: This work demonstrates a general in situ diagnostic approach for precision synthesis and real-time adaptive control that are required to enable the autonomous discovery of novel materials and metastable phases.DOI: 10.1021/acsnano.2c09952
January 12, 2023
2 MIN READ
Controlling edge structures through automated electron beam control via “drill bit” beam pathways
September 1, 2022
1 MIN READ
Defect stabilizes the growth of 2D metastable materials
Scientific Achievement: A synthesis route to metastable monoclinic 2D PdSe2 crystals with high mobility and strong in-plane electrical anisotropy was discovered by defect-mediated chemical vapor deposition.Significance and Impact: This bottom-up synthesis strategy for direct growth of metastable phase of emerging 2D materials is essential for the development of novel quantum materials for future electronic devices.DOI: 10.1021/acsnano.2c02711
December 2, 2021
1 MIN READ
Fast screening of crystal defects via machine learning
Scientific Achievement: An unsupervised machine learning algorithm is developed for detecting crystallographic defects in atomic-resolution images. Significance and Impact: The method enables fast screening of large volumes of atomic-resolution data of a variety of different crystal structures without needing manually labeled training images.DOI: 10.1038/s41524-021-00642-1
November 29, 2021
1 MIN READ
Synthetic control of antisite defects in 2D materials
Scientific Achievement: Antisite defects were selectively incorporated in monolayer WS2 during its growth by regulating W diffusion in Au substrates, as predicted by first principles calculations. Significance and Impact: This synthesis strategy to deliberately control defect structures in emerging 2D materials may enable the development of novel quantum materials for next-generation photonics and spintronics.DOI: 10.1002/adma.202106674
June 4, 2021
1 MIN READ
In Situ Electron Microscopy of Substrate-Guided van der Waals Epitaxy
Scientific Achievement: The mechanisms of van der Waals (vdW) epitaxial growth of monolayer two-dimensional (2D) crystals from amorphous precursors were revealed by in situ pulsed laser heating within a TEM and first-principles calculations. Significance and Impact: This work demonstrates a transformational in situ approach to induce and study the atomistic origins of non-equilibrium crystallization processes.DOI: 10.1021/acsnano.1c00571
March 25, 2021
1 MIN READ
Strain-Induced Growth of MoS2 Twisted Bilayers
Scientific Achievement: Strain developed during the coalescence of growing 2D crystals was shown to induce the nucleation of twisted bilayers with predictable twist angles. Significance and Impact: This work provides a pathway to synthetically control stacking angles in 2D heterostructures for continuously tunable optoelectronic and quantum properties.DOI: 10.1021/acsnano.0c08516
June 26, 2020
7 MIN READ
Process for ‘two-faced’ nanomaterials may aid energy, information tech
An ORNL team used a simple process to implant atoms precisely into the top layers of ultra-thin crystals, yielding two-sided structures with different chemical compositions.
May 8, 2020
1 MIN READ
Surfactant-Mediated Growth and Patterning of 2D Materials
Sodium bromide (NaBr) was used as an additive for growth of 2D crystals on substrates via surfactant-mediated growth mechanism by chemical vapor deposition.
April 8, 2020
2 MIN READ
Growth of 2D Pentagonal PdSe2 Crystals with High Mobility
Few layer PdSe2 crystals were grown by chemical vapor deposition (CVD) on various substrates by assembling and tiling PdSe2 molecules to form puckered pentagonal 2D planes.