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Niebur A, Söll A, Haizmann P, Strolka O, Rudolph D, Tran K, Renz F, Frauendorf AP, Hübner J, Peisert H, Scheele M, Lauth J. Untangling the intertwined: metallic to semiconducting phase transition of colloidal MoS 2 nanoplatelets and nanosheets. NANOSCALE 2023; 15:5679-5688. [PMID: 36861175 DOI: 10.1039/d3nr00096f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
2D semiconducting transition metal dichalcogenides (TMDCs) are highly promising materials for future spin- and valleytronic applications and exhibit an ultrafast response to external (optical) stimuli which is essential for optoelectronics. Colloidal nanochemistry on the other hand is an emerging alternative for the synthesis of 2D TMDC nanosheet (NS) ensembles, allowing for the control of the reaction via tunable precursor and ligand chemistry. Up to now, wet-chemical colloidal syntheses yielded intertwined/agglomerated NSs with a large lateral size. Here, we show a synthesis method for 2D mono- and bilayer MoS2 nanoplatelets with a particularly small lateral size (NPLs, 7.4 nm ± 2.2 nm) and MoS2 NSs (22 nm ± 9 nm) as a reference by adjusting the molybdenum precursor concentration in the reaction. We find that in colloidal 2D MoS2 syntheses initially a mixture of the stable semiconducting and the metastable metallic crystal phase is formed. 2D MoS2 NPLs and NSs then both undergo a full transformation to the semiconducting crystal phase by the end of the reaction, which we quantify by X-ray photoelectron spectroscopy. Phase pure semiconducting MoS2 NPLs with a lateral size approaching the MoS2 exciton Bohr radius exhibit strong additional lateral confinement, leading to a drastically shortened decay of the A and B exciton which is characterized by ultrafast transient absorption spectroscopy. Our findings represent an important step for utilizing colloidal TMDCs, for example small MoS2 NPLs represent an excellent starting point for the growth of heterostructures for future colloidal photonics.
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Affiliation(s)
- André Niebur
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
| | - Aljoscha Söll
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
| | - Philipp Haizmann
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Onno Strolka
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Dominik Rudolph
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
| | - Kevin Tran
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstr. 9, D-30167 Hannover, Germany
- Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, D-30167 Hannover, Germany
| | - Franz Renz
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstr. 9, D-30167 Hannover, Germany
- Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, D-30167 Hannover, Germany
| | - André Philipp Frauendorf
- Institute of Solid State Physics, Leibniz University Hannover, Appelstr. 2, D-30167 Hannover, Germany
| | - Jens Hübner
- Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, D-30167 Hannover, Germany
- Institute of Solid State Physics, Leibniz University Hannover, Appelstr. 2, D-30167 Hannover, Germany
| | - Heiko Peisert
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Marcus Scheele
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Jannika Lauth
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
- Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, D-30167 Hannover, Germany
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Chivers T, Laitinen RS. Neutral binary chalcogen-nitrogen and ternary S,N,P molecules: new structures, bonding insights and potential applications. Dalton Trans 2020; 49:6532-6547. [PMID: 32342078 DOI: 10.1039/d0dt00807a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Early theoretical and experimental investigations of inorganic sulfur-nitrogen compounds were dominated by (a) assessments of the purported aromatic character of cyclic, binary S,N molecules and ions, (b) the unpredictable reactions of the fascinating cage compound S4N4, and (c) the unique structure and properties of the conducting polymer (SN)x. In the last few years, in addition to unexpected developments in the chemistry of well-known sulfur nitrides, the emphasis of these studies has changed to include nitrogen-rich species formed under high pressures, as well as the selenium analogues of well-known S,N compounds. Novel applications have been established or predicted for many binary S/Se,N molecules, including their use for fingerprint detection, in optoelectronic devices, as high energy-density compounds or as hydrogen-storage materials. The purpose of this perspective is to evaluate critically these new aspects of the chemistry of neutral, binary chalcogen-nitrogen molecules and to suggest experimental approaches to the synthesis of target compounds. Recently identified ternary S,N,P compounds will also be considered in light of their isoelectronic relationship with binary S,N cations.
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Affiliation(s)
- Tristram Chivers
- Department of Chemistry, University of Calgary, AB, CanadaT2N 1N4.
| | - Risto S Laitinen
- Laboratory of Inorganic Chemistry, Environmental and Chemical Engineering, University of Oulu, P. O. Box 3000, 90014, Finland.
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Li F, Lv X, Gu J, Tu K, Gong J, Jin P, Chen Z. Semiconducting SN 2 monolayer with three-dimensional auxetic properties: a global minimum with tetracoordinated sulfurs. NANOSCALE 2020; 12:85-92. [PMID: 31531446 PMCID: PMC7423189 DOI: 10.1039/c9nr07263b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Designing new two-dimensional (2D) materials, exploring their unique properties and diverse potential applications are of paramount importance to condensed matter physics and materials science. In this work, we predicted a novel 2D SN2 monolayer (S-SN2) by means of density functional theory (DFT) computations. In the S-SN2 monolayer, each S atom is tetracoordinated with four N atoms, and each N atom bridges two S atoms, thus forming a tri-sublayer structure with square lattice. The monolayer exhibits good stability, as demonstrated by the moderate cohesive energy, all positive phonon modes, and the structural integrity maintained through 10 ps molecular dynamics simulations up to 1000 K. It is an indirect-bandgap semiconductor with high hole mobility, and the bandgap can be tuned by changing the thickness and external strains (the indirect-bandgap to direct-bandgap transition occurs when the biaxial tensile strain reaches 4%). Significantly, it has large Young's modulus and three-dimensional auxetic properties (both in-plane and out-of-plane negative Poisson's ratios). Therefore, the S-SN2 monolayer holds great potential applications in electronics, photoelectronics and mechanics.
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Affiliation(s)
- Fengyu Li
- School of Physical Science and Technology, Inner Mongolia University, Hohhot, 010021, China.
| | - Xiaodong Lv
- School of Physical Science and Technology, Inner Mongolia University, Hohhot, 010021, China.
| | - Jinxing Gu
- Department of Chemistry, The Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, PR 00931, USA.
| | - Kaixiong Tu
- Department of Chemistry, The Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, PR 00931, USA.
| | - Jian Gong
- School of Physical Science and Technology, Inner Mongolia University, Hohhot, 010021, China.
| | - Peng Jin
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
| | - Zhongfang Chen
- Department of Chemistry, The Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, PR 00931, USA.
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Yang G, Gu Y, Yan P, Wang J, Xue J, Zhang X, Lu N, Chen G. Chemical Vapor Deposition Growth of Vertical MoS 2 Nanosheets on p-GaN Nanorods for Photodetector Application. ACS APPLIED MATERIALS & INTERFACES 2019; 11:8453-8460. [PMID: 30742412 DOI: 10.1021/acsami.8b22344] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Vertically oriented multilayered MoS2 nanosheets were successfully grown on p-GaN nanorod substrate using chemical vapor deposition (CVD) method. The p-GaN nanorod substrate was fabricated by dry etching employing self-assembled nickel (Ni) nanopartical as mask. Photoluminescence (PL) and Raman characterizations demonstrate the multilayered structure of MoS2 nanosheet growth on p-GaN nanorods as compared with the referential monolayer MoS2 on GaN wafer substrate under the same growth procedure. The growth model of vertical MoS2 nanosheet formed on GaN nanorods is evidently proposed according to the first-principle calculations. More importantly, it is demonstrated here that the as-grown vertical MoS2 nanosheets/p-GaN nanorod heterostructure holds promising applications in photodetector device, where high optical gain and broad spectral response in the visible range have been obtained.
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Affiliation(s)
- Guofeng Yang
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology , Jiangnan University , Wuxi 214122 , China
| | - Yan Gu
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology , Jiangnan University , Wuxi 214122 , China
| | - Pengfei Yan
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology , Jiangnan University , Wuxi 214122 , China
| | - Jin Wang
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology , Jiangnan University , Wuxi 214122 , China
| | - Junjun Xue
- School of Electronic Science and Engineering , Nanjing University of Posts and Telecommunications , Nanjing 210023 , China
| | - Xiumei Zhang
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology , Jiangnan University , Wuxi 214122 , China
| | - Naiyan Lu
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology , Jiangnan University , Wuxi 214122 , China
| | - Guoqing Chen
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology , Jiangnan University , Wuxi 214122 , China
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Kumar BG, Sadeghi S, Melikov R, Aria MM, Jalali HB, Ow-Yang CW, Nizamoglu S. Structural control of InP/ZnS core/shell quantum dots enables high-quality white LEDs. NANOTECHNOLOGY 2018; 29:345605. [PMID: 29846177 DOI: 10.1088/1361-6528/aac8c9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Herein, we demonstrate that the structural and optical control of InP-based quantum dots (QDs) can lead to high-performance light-emitting diodes (LEDs). Zinc sulphide (ZnS) shells passivate the InP QD core and increase the quantum yield in green-emitting QDs by 13-fold and red-emitting QDs by 8-fold. The optimised QDs are integrated in the liquid state to eliminate aggregation-induced emission quenching and we fabricated white LEDs with a warm, neutral and cool-white appearance by the down-conversion mechanism. The QD-functionalized white LEDs achieve luminous efficiency (LE) up to 14.7 lm W-1 and colour-rendering index up to 80. The structural and optical control of InP/ZnS core/shell QDs enable 23-fold enhancement in LE of white LEDs compared to ones containing only QDs of InP core.
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Billakanti S, Baskaran GK, Muralidharan K. Recyclable Ni3S4Nanocatalyst for Hydrogenation of Nitroarenes. ChemistrySelect 2017. [DOI: 10.1002/slct.201700320] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Srinivas Billakanti
- School of Chemistry; University of Hyderabad; Gachibowli, Hyderabad - 500 046, Telangana India
| | - Ganesh Kumar Baskaran
- School of Chemistry; University of Hyderabad; Gachibowli, Hyderabad - 500 046, Telangana India
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Kuznetsova YV, Rempel SV, Popov ID, Gerasimov EY, Rempel AA. Stabilization of Ag2S nanoparticles in aqueous solution by MPS. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.02.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gottapu S, Muralidharan K. Room temperature synthesis of organic surfactant-free PbS and PbSe nanoparticles exhibiting NIR absorption. NEW J CHEM 2016. [DOI: 10.1039/c5nj02794b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The supersaturated condition in the reaction facilitated the formation of organic surfactant-free nanoparticles.
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Ramesh S, Ramaclus JV, Mosquera E, Das BB. Sol–gel synthesis, structural, optical and magnetic characterization of Ag 3(2+x)Pr xNb 4−xO 11+δ (0.0 ≤ x ≤ 1.0) nanoparticles. RSC Adv 2016. [DOI: 10.1039/c5ra24925b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The optical and magnetic properties of sol–gel synthesized nanocrystalline Ag3(2+x)PrxNb4−xO11+δ (x = 0.0, 0.50 and 1.0; S1–S3) were studied by DRS and VSM plots. Magnetic studies reveal that the samples exhibit ferromagnetism at room temperature.
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Affiliation(s)
- S. Ramesh
- Laboratorio de Materiales Funcionales a Nanoescala
- Departamento de Ciencia de los Materiales
- Universidad de Chile
- Santiago
- Chile
| | | | - Edgar Mosquera
- Laboratorio de Materiales Funcionales a Nanoescala
- Departamento de Ciencia de los Materiales
- Universidad de Chile
- Santiago
- Chile
| | - B. B. Das
- Department of Chemistry
- School of Physical
- Chemical and Applied Sciences
- Pondicherry University
- Pondicherry 605014
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Srinivas B, Kumar BG, Muralidharan K. Stabilizer free copper sulphide nanostructures for rapid photocatalytic decomposition of rhodamine B. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.08.028] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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