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Liu Y, Liang J, Deng Z, Guo S, Ji X, Chen C, Canepa P, Lü X, Mao L. 0D Pyramid-intercalated 2D Bimetallic Halides with Tunable Electronic Structures and Enhanced Emission under Pressure. Angew Chem Int Ed Engl 2023; 62:e202314977. [PMID: 37991471 DOI: 10.1002/anie.202314977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Indexed: 11/23/2023]
Abstract
Hybrid metal halides are emerging semiconductors as promising candidates for optoelectronics. The pursuit of hybridizing various dimensions of metal halides remains a desirable yet highly complex endeavor. By utilizing dimension engineering, a diverse array of new materials with intrinsically different electronic and optical properties has been developed. Here, we report a new family of 2D-0D hybrid bimetallic halides, (C6 N2 H14 )2 SbCdCl9 ⋅ 2H2 O (SbCd) and (C6 N2 H14 )2 SbCuCl9 ⋅ 2H2 O (SbCu). These compounds adopt a new layered structure, consisting of alternating 0D square pyramidal [SbCl5 ] and 2D inorganic layers sandwiched by organic layers. SbCd and SbCu have optical band gaps of 3.3 and 2.3 eV, respectively. These compounds exhibit weak photoluminescence (PL) at room temperature, and the PL gradually enhances with decreasing temperature. Density functional theory (DFT) calculations reveal that SbCd and SbCu are direct gap semiconductors, where first-principles band gaps follow the experimental trend. Moreover, given the different pressure responses of 0D and 2D components, these materials exhibit highly tunable electronic structures during compression, where a remarkable 11 times enhancement in PL emission is observed for SbCd at 19 GPa. This work opens new avenues for designing new layered bimetallic halides and further manipulating their structures and optoelectronic properties via pressure.
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Affiliation(s)
- Yang Liu
- Department of Chemistry, SUSTech Energy Institute for Carbon Neutrality, Southern, University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Jiayuan Liang
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, P. R. China
| | - Zeyu Deng
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore
| | - Songhao Guo
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, P. R. China
| | - Xiaoqin Ji
- Department of Chemistry, SUSTech Energy Institute for Carbon Neutrality, Southern, University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Congcong Chen
- Department of Chemistry, SUSTech Energy Institute for Carbon Neutrality, Southern, University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Pieremanuele Canepa
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore
- Singapore-MIT Alliance for Research and Technology, 1 CREATE Way, 10-01 CREATE Tower, Singapore, 138602, Singapore
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
- Department of Electrical and Computer Engineering, and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA
| | - Xujie Lü
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, P. R. China
| | - Lingling Mao
- Department of Chemistry, SUSTech Energy Institute for Carbon Neutrality, Southern, University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
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Li C, Oliveira EF, Biswas A, Puthirath AB, Zhang X, Pramanik A, Garratt EJ, Neupane MR, Pate BB, Birdwell AG, Ivanov TG, Terlier T, Vajtai R, Ajayan PM. Heteroatom Functionalization of H-Terminated Diamond Surfaces. ACS Appl Mater Interfaces 2023; 15:39980-39988. [PMID: 37555428 DOI: 10.1021/acsami.3c07102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Diamond surface functionalization has received significant research interest recently. Specifically, H-termination has been widely adopted because it endows the diamond surface with negative electron affinity and the hole carrier is injected in the presence of surface transfer dopants. Exploring different functional groups' attachment on diamond surfaces and their impact on the electronic structure, using wet and dry chemical approaches, would hence be of interest in engineering diamond as a semiconductor. Here, we report the functionalization of the H-terminated diamond surface with nitrogen and sulfur heteroatoms. Surface characterization of functionalized diamond surfaces shows that these groups are well-distributed and covalently bonded to diamonds. Four chemical functional groups (-SH, -S-S-, -S-O, and -S=O) were found on the sulfurized diamond surface, and two groups (-NH2 and =NH) upon amination. We also report co-functionalization of surface with N and S (N-S), where sulfurization promotes sequential amination efficiency with reduced exposure time. Electrical measurement shows that heteroatom-modified diamond surfaces possess higher conductivity than H-terminated diamonds. Density functional theory (DFT) shows that upon functionalization with various N/S ratios, the conduction band minimum and valence band maximum downshift, which lowers the bandgap in comparison to an H-terminated diamond. These observations suggest the possibility of heteroatom functionalizations with enhanced surface electrical conductivity on the diamond that are useful for various electronic applications.
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Affiliation(s)
- Chenxi Li
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Eliezer F Oliveira
- School of Sciences, Department of Physics and Meteorology, São Paulo State University (Unesp), Bauru, São Paulo 17033-360, Brazil
| | - Abhijit Biswas
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Anand B Puthirath
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Xiang Zhang
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Atin Pramanik
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Elias J Garratt
- DEVCOM Army Research Laboratory, Adelphi, Maryland 20783, United States
| | - Mahesh R Neupane
- DEVCOM Army Research Laboratory, Adelphi, Maryland 20783, United States
| | - Bradford B Pate
- Chemistry Division, Naval Research Laboratory, Washington, D.C. 20375, United States
| | | | - Tony G Ivanov
- DEVCOM Army Research Laboratory, Adelphi, Maryland 20783, United States
| | - Tanguy Terlier
- Shared Equipment Authority, Rice University, Houston, Texas 77005, United States
| | - Robert Vajtai
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Pulickel M Ajayan
- Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
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