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Krieger A, Wagner M, Haschke S, Kröckel C, Bachmann J, Hauke F, Hirsch A, Gröhn F. Self-assembled hybrid organic-MoS 3-nanoparticle catalyst for light energy conversion. Nanoscale 2020; 12:22952-22957. [PMID: 33196715 DOI: 10.1039/d0nr04820h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We present photocatalytically active, stable polymer-amorphous-MoS3-nanoparticle hybrid structures in aqueous solution. Below 10 nm MoS3 particles in the polymer exhibit an up to 7.5-fold increased photocatalytic activity compared to the neat nanoparticles without any additional photosensitizer. Supramolecular interactions are key in directing the structure formation of the hybrid assembly. The hybrid structures bear potential as novel affordable photocatalysts for solar energy conversion.
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Affiliation(s)
- A Krieger
- Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM) and Bavarian Polymer Institute, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany.
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Márkus BG, Szirmai P, Edelthalhammer KF, Eckerlein P, Hirsch A, Hauke F, Nemes NM, Chacón-Torres JC, Náfrádi B, Forró L, Pichler T, Simon F. Ultralong Spin Lifetime in Light Alkali Atom Doped Graphene. ACS Nano 2020; 14:7492-7501. [PMID: 32484657 PMCID: PMC7315639 DOI: 10.1021/acsnano.0c03191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Today's great challenges of energy and informational technologies are addressed with a singular compound, Li- and Na-doped few-layer graphene. All that is impossible for graphite (homogeneous and high-level Na doping) and unstable for single-layer graphene works very well for this structure. The transformation of the Raman G line to a Fano line shape and the emergence of strong, metallic-like electron spin resonance (ESR) modes attest the high level of graphene doping in liquid ammonia for both kinds of alkali atoms. The spin-relaxation time in our materials, deduced from the ESR line width, is 6-8 ns, which is comparable to the longest values found in spin-transport experiments on ultrahigh-mobility graphene flakes. This could qualify our material as a promising candidate in spintronics devices. On the other hand, the successful sodium doping, this being a highly abundant metal, could be an encouraging alternative to lithium batteries.
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Affiliation(s)
- B. G. Márkus
- Department
of Physics, Budapest University of Technology
and Economics and MTA-BME Lendület Spintronics Research Group
(PROSPIN), PO Box 91, H-1521 Budapest, Hungary
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - P. Szirmai
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - K. F. Edelthalhammer
- Department
of Chemistry and Pharmacy and Institute of Advanced Materials and
Processes (ZMP), University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
| | - P. Eckerlein
- Department
of Chemistry and Pharmacy and Institute of Advanced Materials and
Processes (ZMP), University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
| | - A. Hirsch
- Department
of Chemistry and Pharmacy and Institute of Advanced Materials and
Processes (ZMP), University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
| | - F. Hauke
- Department
of Chemistry and Pharmacy and Institute of Advanced Materials and
Processes (ZMP), University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
| | - N. M. Nemes
- GFMC,
Unidad Asociada ICMM-CSIC “Laboratorio de Heteroestructuras
con Aplicacion en Espintronica”, Departamento de Fisica de Materiales Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Julio C. Chacón-Torres
- Yachay
Tech University, School of Physical Sciences and Nanotechnology, 100119,
Urcuquí, Ecuador and Universidad UTE, Facultad de Ciencias,
Ingeniería y Construcción, 170147 Quito, Ecuador
| | - B. Náfrádi
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - L. Forró
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - T. Pichler
- Faculty
of Physics, University of Vienna, Strudlhofgasse 4, Vienna, A-1090, Austria
| | - F. Simon
- Department
of Physics, Budapest University of Technology
and Economics and MTA-BME Lendület Spintronics Research Group
(PROSPIN), PO Box 91, H-1521 Budapest, Hungary
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
- E-mail:
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Simon F, Kuzmany H, Náfrádi B, Fehér T, Forró L, Fülöp F, Jánossy A, Korecz L, Rockenbauer A, Hauke F, Hirsch A. Magnetic fullerenes inside single-wall carbon nanotubes. Phys Rev Lett 2006; 97:136801. [PMID: 17026062 DOI: 10.1103/physrevlett.97.136801] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2006] [Indexed: 05/12/2023]
Abstract
C(59)N magnetic fullerenes were formed inside single-wall carbon nanotubes by vacuum annealing functionalized C(59)N molecules encapsulated inside the tubes. A hindered, anisotropic rotation of C(59)N was deduced from the temperature dependence of the electron spin resonance spectra near room temperature. Shortening of the spin-lattice relaxation time T(1) of C(59)N indicates a reversible charge transfer toward the host nanotubes above approximately 350 K. Bound C(59)N-C(60) heterodimers are formed at lower temperatures when C(60) is coencapsulated with the functionalized C(59)N. In the 10-300 K range, T(1) of the heterodimer shows a relaxation dominated by the conduction electrons on the nanotubes.
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Affiliation(s)
- F Simon
- Institut für Materialphysik, Universität Wien, Strudlhofgasse 4, A-1090 Wien, Austria.
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