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Dzhagan V, Mazur N, Kapush O, Selyshchev O, Karnaukhov A, Yeshchenko OA, Danylenko MI, Yukhymchuk V, Zahn DRT. Core and Shell Contributions to the Phonon Spectra of CdTe/CdS Quantum Dots. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:921. [PMID: 36903799 PMCID: PMC10004847 DOI: 10.3390/nano13050921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 02/20/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
The parameters of the shell and interface in semiconductor core/shell nanocrystals (NCs) are determinant for their optical properties and charge transfer but are challenging to be studied. Raman spectroscopy was shown earlier to be a suitable informative probe of the core/shell structure. Here, we report the results of a spectroscopic study of CdTe NCs synthesized by a facile route in water, using thioglycolic acid (TGA) as a stabilizer. Both core-level X-ray photoelectron (XPS) and vibrational (Raman and infrared) spectra show that using thiol during the synthesis results in the formation of a CdS shell around the CdTe core NCs. Even though the spectral positions of the optical absorption and photoluminescence bands of such NCs are determined by the CdTe core, the far-infrared absorption and resonant Raman scattering spectra are dominated by the vibrations related with the shell. The physical mechanism of the observed effect is discussed and opposed to the results reported before for thiol-free CdTe Ns as well as CdSe/CdS and CdSe/ZnS core/shell NC systems, where the core phonons were clearly detected under similar experimental conditions.
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Affiliation(s)
- Volodymyr Dzhagan
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
- Physics Department, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
| | - Nazar Mazur
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Olga Kapush
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Oleksandr Selyshchev
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, D-09107 Chemnitz, Germany
| | - Anatolii Karnaukhov
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Oleg A. Yeshchenko
- Physics Department, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
| | - Mykola I. Danylenko
- Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine
| | - Volodymyr Yukhymchuk
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
| | - Dietrich R. T. Zahn
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, D-09107 Chemnitz, Germany
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Abstract
Anisotropic heterostructures of colloidal nanocrystals embed size-, shape-, and composition-dependent electronic structure within variable three-dimensional morphology, enabling intricate design of solution-processable materials with high performance and programmable functionality. The key to designing and synthesizing such complex materials lies in understanding the fundamental thermodynamic and kinetic factors that govern nanocrystal growth. In this review, nanorod heterostructures, the simplest of anisotropic nanocrystal heterostructures, are discussed with respect to their growth mechanisms. The effects of crystal structure, surface faceting/energies, lattice strain, ligand sterics, precursor reactivity, and reaction temperature on the growth of nanorod heterostructures through heteroepitaxy and cation exchange reactions are explored with currently known examples. Understanding the role of various thermodynamic and kinetic parameters enables the controlled synthesis of complex nanorod heterostructures that can exhibit unique tailored properties. Selected application prospects arising from such capabilities are then discussed.
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Affiliation(s)
- Gryphon A Drake
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 United States
| | - Logan P Keating
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 United States
| | - Moonsub Shim
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 United States
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Zhang G, Ke X, Liu X, Liao H, Wang W, Yu H, Wang K, Yang S, Tu C, Gu H, Luo D, Huang L, Zhang M. Interfacial Engineering of Semicoherent Interface at Purified CsPbBr 3 Quantum Dots/2D-PbSe for Optimal CO 2 Photoreduction Performance. ACS APPLIED MATERIALS & INTERFACES 2022; 14:44909-44921. [PMID: 36150167 DOI: 10.1021/acsami.2c09711] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Heterogeneous photocatalysts are extensively used to achieve interfacial electric fields for acceleration of oriented charge carrier transport and further promotion of photocatalytic redox reactions. Unfortunately, the incoherent interfaces are almost present in the heterostructures owing to large lattice mismatch accompanied by the interfacial defects and high density of gap states, acting as high energy barriers for charge migration. In this work, we report the atomic engineering of CsPbBr3/PbSe heterogeneous interfaces and conversion from incoherent features to semicoherent characters via methyl acetate (MeOAc) purification of CsPbBr3 quantum dots (QDs) before composited with two-dimensional (2D)-PbSe, which is confirmed by high-resolution transmission electron microscopy. The photocatalytic performances and theoretical calculations indicate that semicoherent interfaces are favorable for improving the activity and reactivity of the heterostructure, triggering 3 times enhanced photocatalytic CO2 reduction rate with 91% selectivity and satisfactory stability. This study proposes a facile method for photocatalytic heterojunctions to transform incoherent interfaces to photocatalytically beneficial semicoherent boundaries, accompanying with a systematic analysis of the consequent chemical dynamics to demonstrate the mechanism of the semicoherent interface for supporting photocatalysis. The understandings gained from this work are valuable for rational interfacial lattice engineering of heterogeneous photocatalysts for efficient solar fuel production.
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Affiliation(s)
- Gaotian Zhang
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
| | - Xi Ke
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
| | - Xiao Liu
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
| | - Haijun Liao
- School of Materials of Energy, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Weizhe Wang
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
| | - He Yu
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
| | - Kunqiang Wang
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
| | - Shuhui Yang
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
| | - Chen Tu
- School of Chemistry, Faculty of Science, Chemistry Building F11, Camperdown 2050, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Huaimin Gu
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
| | - Dongxiang Luo
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
- Huangpu Hydrogen Innovation Center/Guangzhou Key Laboratory for Clean Energy and Materials, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Le Huang
- School of Materials of Energy, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Menglong Zhang
- School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China
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Zhang Y, Luo L, Shi Z, Shen X, Peng C, Liu J, Chen Z, Chen Q, Zhang L. Synthesis of MoS
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/CdS Heterostructures on Carbon‐Fiber Cloth as Filter‐Membrane‐Shaped Photocatalyst for Purifying the Flowing Wastewater under Visible‐Light Illumination. ChemCatChem 2019. [DOI: 10.1002/cctc.201900542] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Yan Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua University Shanghai 201620 China
- Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China
| | - Li Luo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua University Shanghai 201620 China
| | - Zhun Shi
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua University Shanghai 201620 China
| | - Xiaofeng Shen
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua University Shanghai 201620 China
| | - Cheng Peng
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua University Shanghai 201620 China
- Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China
| | - Jianshe Liu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua University Shanghai 201620 China
- Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China
| | - Zhigang Chen
- International joint Laboratory for Advanced Fiber and Low Dimension Materials College of Materials Science and EngineeringDonghua University Shanghai 201620 China
| | - Quanyuan Chen
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua University Shanghai 201620 China
| | - Lisha Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua University Shanghai 201620 China
- Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China
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