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Wang X, Hu Z, Liang L, Wang Z, Wang Y, Li Y, Xiao B. Effect of S⋯π interactions on the charge transport properties of the DPP framework. Chem Commun (Camb) 2024; 60:815-818. [PMID: 38086738 DOI: 10.1039/d3cc04995g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
In this work, we designed and synthesized two similar π-conjugated molecules, N-alkyl (DPP-R) and N-aryl (DPP-B), to comparatively explore the S⋯π interactions using a scanning tunneling microscopy-based break junction (STM-BJ) technique. The conductance results of the STM-BJ experiments indicated that DPP-R has a 66% greater conductance (G) than DPP-B. Combined with molecular simulations, it was demonstrated that the presence of S⋯π interactions led to a certain degree of orbital overlap of the highest occupied molecular orbital (HOMO), and created a favorable channel for electron transport in the DPP-B junction.
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Affiliation(s)
- Xu Wang
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Zhonghao Hu
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Lei Liang
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Zhiye Wang
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Yanze Wang
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Yunchuan Li
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Bohuai Xiao
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China.
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Ma T, Chang S, He J, Liang F. Emerging sensing platforms based on Cucurbit[ n]uril functionalized gold nanoparticles and electrodes. Chem Commun (Camb) 2023; 60:150-167. [PMID: 38054368 DOI: 10.1039/d3cc04851a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Cucurbit[n]urils (CB[n]s, n = 5-8, 10, and 14), synthetic macrocycles with unique host-guest properties, have triggered increasing research interest in recent years. Gold nanoparticles (Au NPs) and electrodes stand out as exceptional substrates for sensing due to their remarkable physicochemical characteristics. Coupling the CB[n]s with Au NPs and electrodes has enabled the development of emerging sensing platforms for various promising applications. However, monitoring the behavior of analytes at the single-molecule level is currently one of the most challenging topics in the field of CB[n]-based sensing. Constructing supramolecular junctions in a sensing platform provides an ideal structure for single-molecule analysis, which can provide insights for a fundamental understanding of supramolecular interactions and chemical reactions and guide the design of sensing applications. This feature article outlines the progress in the preparation of the CB[n] functionalized Au NPs and Au electrodes, as well as the construction and application of supramolecular junctions in sensing platforms, based on the methods of recognition tunneling (RT), surface-enhanced Raman spectroscopy (SERS), single-molecule force spectroscopy (SMFS), and electrochemical sensing (ECS). A brief perspective on the future development of and challenges in CB[n] mediated sensing platforms is also covered.
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Affiliation(s)
- Tao Ma
- The State Key Laboratory of Refractories and Metallurgy, Coal Conversion and New Carbon Materials Hubei Key Laboratory, School of Chemistry & Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Shuai Chang
- The State Key Laboratory of Refractories and Metallurgy, Coal Conversion and New Carbon Materials Hubei Key Laboratory, School of Chemistry & Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Jin He
- Department of Physics, Florida International University, Miami, Florida 33199, USA.
| | - Feng Liang
- The State Key Laboratory of Refractories and Metallurgy, Coal Conversion and New Carbon Materials Hubei Key Laboratory, School of Chemistry & Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
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Ma J, Shi Y, Wang Z, Wang X, Li Y, Sun M, Guo J, Qian G, Chang S. The effect of non-covalent conformational locks on intra-molecular charge transport of OPV units. Chem Commun (Camb) 2022; 58:3298-3301. [PMID: 35175265 DOI: 10.1039/d1cc06406a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Although organic photovoltaic (OPV) molecules containing non-covalent conformational locks (NCLs) are demonstrated with superior device scale charge transport, the NCLs' working mechanism at the molecular level has not been directly addressed or revealed. Herein, three widely used OPV building blocks DT-BT, DT-FBT, and DT-OBT were prepared and comparatively researched for their intra-molecule charge transport (ICT) based on single molecular conductance measurements and theoretical calculation. The measured conductance (G) of the three molecules displays an order of GDT-BT < GDT-FBT < GDT-OBT, contradicting the conductivity order predicted by tunnelling theory. Further research demonstrated that this change was mainly caused by NCLs embedded in DT-FBT and DT-OBT, resulting in more efficient charge transporting pathways, evidenced by their HOMOs showing hyper-conjugation characteristics.
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Affiliation(s)
- Jingjing Ma
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Yangyang Shi
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Zhiye Wang
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Xu Wang
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Yunchuan Li
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Mingjun Sun
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Jing Guo
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Gongming Qian
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Shuai Chang
- The State Key Laboratory of Refractories and Metallurgy, and Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China.
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Xiao B, Dong J, Wang Z, Wang X, Sun M, Guo J, Qian G, Li Y, Chang S. Conductance modulation of metal-molecule-metal junction via extra acid addition and its mechanism investigation. Chemphyschem 2022; 23:e202100833. [PMID: 35138016 DOI: 10.1002/cphc.202100833] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 01/29/2022] [Indexed: 11/10/2022]
Abstract
The advance of single molecular device fabrication strongly relies on the understanding of the metal-molecule-metal junction that can response to the external stimulus. A model Lewis basic molecule DBP which can react with Lewis acid and protic acid was synthesized, then the molecular conducting behavior of the original molecule and the resulted Lewis acid-base pair were researched. Allowing for their identical physical paths for charge conducting, these results indicated that adjusting the molecular electronic structure, even not directly changing the conductive molecular backbone, could also tune the charge transporting ability by nearly one order of magnitude. Furthermore, the addition of another Lewis base - Triethylamine to Lewis acid-base pair brought the electrical properties back to that of single DBP junction, which establishs a basic understanding in the design and construction of reversible and controllable molecular device based on pyridine derived molecule.
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Affiliation(s)
- Bohuai Xiao
- Wuhan University of Science and Technology, College of Material and Metallurgy, CHINA
| | - Jianqiao Dong
- Wuhan University of Science and Technology, School of Chemistry and Chemical Engineering, 947 Heping Avenue, Qingshan District, Wuhan, CHINA
| | - Zhiye Wang
- Wuhan University of Science and Technology, College of Material and Metallurgy, CHINA
| | - Xu Wang
- Wuhan University of Science and Technology, College of Material and Metallurgy, CHINA
| | - Mingjun Sun
- Wuhan University of Science and Technology, College of Material and Metallurgy, CHINA
| | - Jing Guo
- Wuhan University of Science and Technology, College of Material and Metallurgy, CHINA
| | - Gongming Qian
- Wuhan University of Science and Technology, College of Resources and Environment, CHINA
| | - Yunchuan Li
- Wuhan University of Science and Technology, College of Material and Metallurgy, 947 Heping Avenue, Qingshan District, 430081, Wuhan, CHINA
| | - Shuai Chang
- Wuhan University of Science and Technology, College of Material and Metallurgy, CHINA
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Qu FY, Zhao ZH, Ren XR, Zhang SF, Wang L, Wang D. Multiple heteroatom substitution effect on destructive quantum interference in tripodal single-molecule junctions. Phys Chem Chem Phys 2022; 24:26795-26801. [DOI: 10.1039/d2cp03902h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Destructive quantum interference manipulating the electron transport in tripodal meta-linked phenyl derivatives can be modulated by adjusting the number and the position of the substituted heteroatom(s) inside the molecular core.
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Affiliation(s)
- Fa-Yu Qu
- School of Materials Science and Technology, China University of Geosciences, Beijing, 10083, China
- CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Science (CAS), Beijing, 100190, China
| | - Zhi-Hao Zhao
- CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Science (CAS), Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiao-Rui Ren
- CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Science (CAS), Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shou-Feng Zhang
- Department of Electronic Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, P. R. China
| | - Lin Wang
- School of Materials Science and Technology, China University of Geosciences, Beijing, 10083, China
| | - Dong Wang
- CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Science (CAS), Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
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6
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Chen Y, Huang M, Zhou Q, Li Z, Meng J, Pan M, Ye X, Liu T, Chang S, Xiao S. Regio- and Steric Effects on Single Molecule Conductance of Phenanthrenes. NANO LETTERS 2021; 21:10333-10340. [PMID: 34874740 DOI: 10.1021/acs.nanolett.1c03565] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Here, six phenanthrene (the smallest arm-chair graphene nanoribbon) derivatives with dithiomethyl substitutions at different positions as the anchoring groups were synthesized. Scanning tunneling microscopy break junction technique was used to measure their single molecule conductances between gold electrodes, which showed a difference as much as 20-fold in the range of ∼10-2.82 G0 to ∼10-4.09 G0 following the trend of G2,7 > G3,6 > G2,6 > G1,7 > G1,6 > G1,8. DFT calculations agree well with this measured trend and indicate that the single molecule conductances are a combination of energy alignment, electronic coupling, and quantum effects. This significant regio- and steric effect on the single molecule conductance of phenanthrene model molecules shows the complexity in the practice of graphene nanoribbons as building blocks for future carbon-based electronics in one hand but also provides good conductance tunability on the other hand.
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Affiliation(s)
- Yan Chen
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Mingzhu Huang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
| | - Qinghai Zhou
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Zhen Li
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Jing Meng
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Mengyuan Pan
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Xiang Ye
- Key Laboratory of Opto-electrical Material and Device, Department of Physics, Shanghai Normal University, Shanghai 200234, China
| | - Taifeng Liu
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Shuai Chang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
| | - Shengxiong Xiao
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
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Huang M, Yu L, Zhang M, Wang Z, Xiao B, Liu Y, He J, Chang S. Developing Longer-Lived Single Molecule Junctions with a Functional Flexible Electrode. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2101911. [PMID: 34292668 DOI: 10.1002/smll.202101911] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/30/2021] [Indexed: 06/13/2023]
Abstract
Creating single-molecule junctions with a long-lived lifetime at room temperature is an open challenge. Finding simple and efficient approaches to increase the durability of single-molecule junction is also of practical value in molecular electronics. Here it is shown that a flexible gold-coated nanopipette electrode can be utilized in scanning tunneling microscope (STM) break-junction measurements to efficiently enhance the stability of molecular junctions by comparing with the measurements using conventional solid gold probes. The stabilizing effect of the flexible electrode displays anchor group dependence, which increases with the binding energy between the anchor group and gold. An empirical model is proposed and shows that the flexible electrode could promote stable binding geometries at the gold-molecule interface and slow down the junction breakage caused by the external perturbations, thereby extending the junction lifetime. Finally, it is demonstrated for the first time that the internal conduit of the flexible STM tip can be utilized for the controlled molecule delivery and molecular junction formation.
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Affiliation(s)
- Mingzhu Huang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China
- Department of Physics, Biomolecular Science Institute, Florida International University, Miami, FL, 33199, USA
| | - Lei Yu
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China
| | - Mingyang Zhang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China
| | - Zhe Wang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China
| | - Bohuai Xiao
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China
| | - Yichong Liu
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China
| | - Jin He
- Department of Physics, Biomolecular Science Institute, Florida International University, Miami, FL, 33199, USA
| | - Shuai Chang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China
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Huang M, Zhou Q, Liang F, Yu L, Xiao B, Li Y, Zhang M, Chen Y, He J, Xiao S, Chang S. Detecting Individual Bond Switching within Amides in a Tunneling Junction. NANO LETTERS 2021; 21:5409-5414. [PMID: 34124909 DOI: 10.1021/acs.nanolett.1c01882] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Amides are essential in the chemistry of life. Detecting the chemical bond states within amides could unravel the nature of amide stabilization and planarity, which is critical to the structure and reactivity of such molecules. Yet, so far, no work has been reported to detect or measure the bond changes at the single-molecule level within amides. Here, we show that a transition between single and double bonds between N and C atoms in an amide can be monitored in real time in a nanogap between gold electrodes via the generation of distinctive conductance features. Density functional theory simulations show that the switching between amide isomers proceeds via a proton transfer process facilitated by a water molecule bridge, and the resulting molecular junctions display bimodal conductance states with a difference as much as nine times.
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Affiliation(s)
- Mingzhu Huang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
- Department of Physics, Biomolecular Science Institute, Florida International University, Miami, Florida 33199, United States
| | - Qinghai Zhou
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Feng Liang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
| | - Lei Yu
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
| | - Bohuai Xiao
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
| | - Yunchuan Li
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
| | - Mingyang Zhang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
| | - Yan Chen
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Jin He
- Department of Physics, Biomolecular Science Institute, Florida International University, Miami, Florida 33199, United States
| | - Shengxiong Xiao
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry, Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
| | - Shuai Chang
- The State Key Laboratory of Refractories and Metallurgy, the Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
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