Atomic Defects in Two-Dimensional Materials: From Single-Atom Spectroscopy to Functionalities in Opto-/Electronics, Nanomagnetism, and Catalysis

2017 ◽  
Vol 29 (14) ◽  
pp. 1606434 ◽  
Author(s):  
Jinhua Hong ◽  
Chuanhong Jin ◽  
Jun Yuan ◽  
Ze Zhang
Keyword(s):  
Single Atom ◽  
Two Dimensional ◽  
Two Dimensional Materials

Pd1/BN as a promising single atom catalyst of CO oxidation: a dispersion-corrected density functional theory study

RSC Advances ◽  
2015 ◽  
Vol 5 (103) ◽  
pp. 84381-84388 ◽  
Author(s):  
Zhansheng Lu ◽  
Peng Lv ◽  
Jie Xue ◽  
Huanhuan Wang ◽  
Yizhe Wang ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Co Oxidation ◽  
Metal Atom ◽  
Density Functional ◽  
Single Atom ◽  
Two Dimensional ◽  
Density Functional Theory Study ◽  
Functional Theory ◽  
Metal Atoms ◽  
Two Dimensional Materials

Single metal atom catalysts exhibit extraordinary activity in a large number of reactions, and some two-dimensional materials (such as graphene and h-BN) are found to be prominent supports to stabilize single metal atoms.

scholarly journals Properties of two dimensional materials obtained from experiments in a low-voltage aberration-corrected TEM

2014 ◽  
Vol 70 (a1) ◽  
pp. C21-C21
Author(s):  
Ute Kaiser
Keyword(s):  
High Resolution ◽  
Atomic Structure ◽  
Low Voltage ◽  
Energetic Electron ◽  
Single Atom ◽  
Two Dimensional ◽  
Total Electron ◽  
Two Dimensional Materials ◽  
High Resolution Tem ◽  
Aberration Corrected

We report on structural and electronic properties of two-dimensional materials ob-tained by analytical low-voltage aberration-corrected transmission electron microscopy. Basic crystallographic defects and their peculiarities will be discussed for two-dimensional materials at the atomic level. Thus, we report the atomic structure of point defect and -clusters [1], the full life circle of dislocations [2] and the movements of grain boundaries in grapheme [3]. In addition, we unravel the atomic structure of the amorphous phase (graphene, SiO2) in direct space just from single-atom-based analysis of high-resolution TEM images [5, 6]. As the energetic electron beam is interacting with the specimen via transferring energy to the atoms, structural transformation between different phases can be followed atom-by-atom [7, 8, 9]. In addition, physical properties such as the knock-on damage threshold is determined from controlled direct space experiments and precise measurements of high-resolution TEM images of graphene and MoS2[8, 7]. However beam-electron interactions with the specimen are also restricting imaging the pristine structure of a sample. It can be suppressed by simply limiting the total electron doses on the samples. Limited electron doses, however, result in worse signal to noise ratios. Here, a quantitative approach for estimating the visibility of objects in TEM images with limited doses will be presented [10]. Another traditional approach to suppress electron-induced damage during HRTEM observation is to employ an efficient cleaning procedure [11] and the protective coating of sensitive materials. This old approach will be taken to its extreme, when radiation sensitive materials are enclosed inside carbon nanotubes [12] and between two graphene layers [13]. We show moreover the advantage of lowering the accelerating voltage for imaging the pristine structure of low-dimensional materials [14]. [4] P. Wachsmuth, R. Hambach, M.K. Kinyanjui, et al., Phys. Rev. B B 88, 075433, (2013) [5] P. Y. Huang, S. Kurasch, A. Srivastava, et al. Nano Lett. 12(2), 1081, (2012) [6] P. Y. Huang, S. Kurasch, J.S. Alden, et al., Science 342, 224, (2013) [7] H.-P. Komsa, J. Kotakoski, S. Kurasch, et al., Phys. Rev. Lett. 109, 035503 (2012) [8] C Meyer, F Eder, S Kurasch, et al. Physical Review Letters, 108, 196102. 2012. [9] B. Westenfelder, J. C. Meyer, J. Biskupek, et al., Transformations of Carbon Adsorbates on Graphene Substrates under Extreme Heat, Nano Letters, 11 (12), 5123-5127, 2011 [10] Z. Lee, H. Rose, O. Lehtinen, et al., Ultramicroscopy (2014), DOI 10.1016/j.ultramic.2014.01.010 [11] G. Algara-Siller, S. Kurasch, M. Sedighi, et al., Appl. Phys. Lett. 103 (2013) 203107 [12] T. Zoberbier, T. W. Chamberlain, J. Biskupek, et al., J. Am. Chem. Soc. 134 (2012) 3073-3079 [13] G. Algara-Siller, S. Kurasch, M. Sedighi, et al., Appl. Phys. Lett. 103. 203107, (2013) [14] U. Kaiser et al. Ultramicroscopy, 111, 8, 1239, (2011) [15] Fruitful cooperation within the SALVE project and financial support by the DFG (German Research Foundation) and by the Ministry of Science, Research, and the Arts (MWK) of Baden-Württemberg are gratefully acknowledged.

Surface strategies for catalytic CO2 reduction: from two-dimensional materials to nanoclusters to single atoms

2019 ◽  
Vol 48 (21) ◽  
pp. 5310-5349 ◽  
Author(s):  
Liming Wang ◽  
Wenlong Chen ◽  
Doudou Zhang ◽  
Yaping Du ◽  
Rose Amal ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Single Atom ◽  
Two Dimensional ◽  
2D Material ◽  
Single Atoms ◽  
Two Dimensional Materials

This work constructively reviewed and predicted the surface strategies for catalytic CO2 reduction with 2D material, nanocluster and single-atom catalysts

Single-Atom Electroplating on Two Dimensional Materials

2018 ◽  
Vol 31 (2) ◽  
pp. 429-435 ◽  
Author(s):  
Ningning Xuan ◽  
Jinhang Chen ◽  
Jianjian Shi ◽  
Yawei Yue ◽  
Peiyuan Zhuang ◽  
...  
Keyword(s):  
Single Atom ◽  
Two Dimensional ◽  
Two Dimensional Materials

Recent advances in single-atom electrocatalysts supported on two-dimensional materials for oxygen evolution reaction

2021 ◽  
Author(s):  
Yanan Zhou ◽  
Jing Li ◽  
Xiaoping Gao ◽  
Wei Chu ◽  
Guoping Gao ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Hydrogen Generation ◽  
Transfer Reactions ◽  
Single Atom ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Major Bottleneck ◽  
Kinetics Of

As a half-reaction of electrolytic water-splitting for hydrogen generation, the oxygen evolution reaction (OER) is the major bottleneck due to its sluggish kinetics of the four-electron transfer reactions. Developing high-efficiency...

Electron beam triggered single-atom dynamics in two-dimensional materials

2020 ◽  
Vol 33 (6) ◽  
pp. 063001
Author(s):  
Xiaoxu Zhao ◽  
Kian Ping Loh ◽  
Stephen J Pennycook
Keyword(s):  
Electron Beam ◽  
Single Atom ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Atom Dynamics

Mechanistic Understanding and Design of Non-noble Metal-based Single-atom Catalysts Supported on Two-dimensional Materials for CO2 Electroreduction

2021 ◽  
Author(s):  
Ya Huang ◽  
Faisal Rehman ◽  
Mohsen Tamtaji ◽  
Xuning Li ◽  
Yanqiang Huang ◽  
...  
Keyword(s):  
Low Cost ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Single Atom ◽  
Two Dimensional ◽  
Co2 Electroreduction ◽  
Wide Range ◽  
Two Dimensional Materials ◽  
Earth Abundant ◽  
Co2 Reduction Reaction

Single-atom catalysts (SACs) composing of low-cost, earth-abundant metals, with two-dimensional material supports have displayed great potential in a wide range of electrochemical reactions, including CO2 reduction reaction (CO2RR) to convert...

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