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Metastable metallic nanoparticles could find use in electronics, optics
HOUSTON – (Jan. 11, 2021) – Rice University scientists have extended their technique to produce graphene in a flash to tailor the properties of other 2D materials.
The labs of chemist James Tour and materials theorist Boris Yakobson reported in the American Chemical Society’s ACS Nano they have successfully “flashed” bulk amounts of 2D dichalcogenides, changing them from semiconductors to metallics.
Such materials are valuable for electronics, catalysis and as lubricants, among other applications.
Rice University scientists extended their technique to produce graphene in a flash to tailor the properties of 2D dichalcogenides molybdenum disulfide and tungsten disulfide, quickly turning them into metastable metallics for electronic and optical applications. Courtesy of the Tour Group
The process employs flash Joule heating — using an electrical charge to dramatically raise the material’s temperature — to convert semiconducting molybdenum disulfide and tungsten disulfide. The duration of the pulse and select additives can also control the now-metallic products’ properties.
“This rapid process permits us to make an entirely new class of highly valued materials in large scale and without the use of solvents or water,” Tour said.
Two-dimensional dichalcogenides look like hexagonal graphene from above, but viewing them from an angle reveals a sandwichlike structure. In molybdenum disulfide, for instance, a single plane of molybdenum atoms sits between similar, but offset, planes of sulfur.
Making each material in its metallic phase (known as 1T) previously required far more complex processes, according to the researchers. Even then, the products were known to be unstable in ambient conditions. Flash Joule heating appears to solve that problem, producing metastable dichalcogenides in a thousandth of a second.
An electron microscope image shows tungsten disulfide in its metastable 1T state. The orange dots represent sulfur atoms, the blue represent tungsten. Courtesy of the Tour Group
Powdered, commercially available dichalcogenides mixed with carbon black or tungsten powder to increase their conductivity were placed in a ceramic tube capped with electrodes and flashed with more than 1,350 amps of power for a fraction of a second, then rapidly cooled. With the tube under vacuum, extraneous gases were vented, leaving mostly pure metallics to be harvested.
According to the Yakobson team’s calculations, the large energy input forces structural defects to appear in the materials’ crystal lattices, adding negative charges that make 1T the thermodynamically preferred phase.
“It is an interesting fast-forward incarnation of Le Chatelier’s principle: Under voltage, the material changes to a more conducting 1T phase, to counteract/reduce the applied electric fields,” said co-author Ksenia Bets, a researcher in the Yakobson group. “Our detailed computations reveal that the kinetic path is indirect: The sublimating sulfur creates a vacancy-rich lattice that energetically prefers a 1T structure.”
The fact that conditions and additives can influence the final product should lead to a systematic study about possible variations, Tour said.
Rice graduate student Weiyin Chen is lead author of the paper. Additional co-authors are Rice graduate students Zhe Wang, Emily McHugh, Wala Algozeeb and Jinhang Chen; postdoctoral researchers Duy Xuan Luong and Bing Deng; alumni Muqing Ren and Michael Stanford; assistant research professor Hua Guo; research scientist Guanhui Gao; and undergraduates John Tianci Li and William Carsten.
Tour is the T.T. and W.F. Chao Chair in Chemistry as well as a professor of computer science and of materials science and nanoengineering. Yakobson is the Karl F. Hasselmann Professor of Materials Science and NanoEngineering and a professor of chemistry.
The Air Force Office of Scientific Research, the Department of Energy (DOE) National Energy Technology Laboratory and DOE Basic Energy Sciences supported the research.
-30-
Read the abstract at https://pubs.acs.org/doi/10.1021/acsnano.0c08460.
Follow Rice News and Media Relations via Twitter @RiceUNews
Related materials:
Tour Group: http://www.jmtour.com
Yakobson Research Group: https://biygroup.blogs.rice.edu
Department of Chemistry: https://chemistry.rice.edu
Rice Department of Materials Science and Nanoengineering: https://msne.rice.edu
Images for download:
Rice University scientists extended their technique to produce graphene in a flash to tailor the properties of 2D dichalcogenides molybdenum disulfide and tungsten disulfide, quickly turning them into metastable metallics for electronic and optical applications. (Credit: Tour Group/Rice University)
An electron microscope image shows tungsten disulfide in its metastable 1T state. The orange dots represent sulfur atoms, the blue represent tungsten. Rice University scientists used flash Joule heating to tailor the properties of 2D dichalcogenides, quickly turning them into metastable metallics for electronic and optical applications. (Credit: Tour Group/Rice University)
Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation’s top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute for Public Policy. With 3,978 undergraduates and 3,192 graduate students, Rice’s undergraduate student-to-faculty ratio is just under 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice is ranked No. 1 for lots of race/class interaction and No. 1 for quality of life by the Princeton Review. Rice is also rated as a best value among private universities by Kiplinger’s Personal Finance.
NEWS RELEASE
Metastable metallic nanoparticles could find use in electronics, optics
HOUSTON – (Jan. 11, 2021) – Rice University scientists have extended their technique to produce graphene in a flash to tailor the properties of other 2D materials.
The labs of chemist James Tour and materials theorist Boris Yakobson reported in the American Chemical Society’s ACS Nano they have successfully “flashed” bulk amounts of 2D dichalcogenides, changing them from semiconductors to metallics.
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Such materials are valuable for electronics, catalysis and as lubricants, among other applications.
Rice University scientists extended their technique to produce graphene in a flash to tailor the properties of 2D dichalcogenides molybdenum disulfide and tungsten disulfide, quickly turning them into metastable metallics for electronic and optical applications. Courtesy of the Tour Group
The process employs flash Joule heating — using an electrical charge to dramatically raise the material’s temperature — to convert semiconducting molybdenum disulfide and tungsten disulfide. The duration of the pulse and select additives can also control the now-metallic products’ properties.
“This rapid process permits us to make an entirely new class of highly valued materials in large scale and without the use of solvents or water,” Tour said.
Two-dimensional dichalcogenides look like hexagonal graphene from above, but viewing them from an angle reveals a sandwichlike structure. In molybdenum disulfide, for instance, a single plane of molybdenum atoms sits between similar, but offset, planes of sulfur.
Making each material in its metallic phase (known as 1T) previously required far more complex processes, according to the researchers. Even then, the products were known to be unstable in ambient conditions. Flash Joule heating appears to solve that problem, producing metastable dichalcogenides in a thousandth of a second.
An electron microscope image shows tungsten disulfide in its metastable 1T state. The orange dots represent sulfur atoms, the blue represent tungsten. Courtesy of the Tour Group
Powdered, commercially available dichalcogenides mixed with carbon black or tungsten powder to increase their conductivity were placed in a ceramic tube capped with electrodes and flashed with more than 1,350 amps of power for a fraction of a second, then rapidly cooled. With the tube under vacuum, extraneous gases were vented, leaving mostly pure metallics to be harvested.
According to the Yakobson team’s calculations, the large energy input forces structural defects to appear in the materials’ crystal lattices, adding negative charges that make 1T the thermodynamically preferred phase.
“It is an interesting fast-forward incarnation of Le Chatelier’s principle: Under voltage, the material changes to a more conducting 1T phase, to counteract/reduce the applied electric fields,” said co-author Ksenia Bets, a researcher in the Yakobson group. “Our detailed computations reveal that the kinetic path is indirect: The sublimating sulfur creates a vacancy-rich lattice that energetically prefers a 1T structure.”
The fact that conditions and additives can influence the final product should lead to a systematic study about possible variations, Tour said.
Flash 2d Animation software, free download
Rice graduate student Weiyin Chen is lead author of the paper. Additional co-authors are Rice graduate students Zhe Wang, Emily McHugh, Wala Algozeeb and Jinhang Chen; postdoctoral researchers Duy Xuan Luong and Bing Deng; alumni Muqing Ren and Michael Stanford; assistant research professor Hua Guo; research scientist Guanhui Gao; and undergraduates John Tianci Li and William Carsten.
Tour is the T.T. and W.F. Chao Chair in Chemistry as well as a professor of computer science and of materials science and nanoengineering. Yakobson is the Karl F. Hasselmann Professor of Materials Science and NanoEngineering and a professor of chemistry.
The Air Force Office of Scientific Research, the Department of Energy (DOE) National Energy Technology Laboratory and DOE Basic Energy Sciences supported the research.
-30-
Read the abstract at https://pubs.acs.org/doi/10.1021/acsnano.0c08460.
Follow Rice News and Media Relations via Twitter @RiceUNews
Related materials:
Tour Group: http://www.jmtour.com
Yakobson Research Group: https://biygroup.blogs.rice.edu
Department of Chemistry: https://chemistry.rice.edu
Rice Department of Materials Science and Nanoengineering: https://msne.rice.edu
Images for download:
Rice University scientists extended their technique to produce graphene in a flash to tailor the properties of 2D dichalcogenides molybdenum disulfide and tungsten disulfide, quickly turning them into metastable metallics for electronic and optical applications. (Credit: Tour Group/Rice University)
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An electron microscope image shows tungsten disulfide in its metastable 1T state. The orange dots represent sulfur atoms, the blue represent tungsten. Rice University scientists used flash Joule heating to tailor the properties of 2D dichalcogenides, quickly turning them into metastable metallics for electronic and optical applications. (Credit: Tour Group/Rice University)
Flash 2d Shooter Game
Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation’s top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute for Public Policy. With 3,978 undergraduates and 3,192 graduate students, Rice’s undergraduate student-to-faculty ratio is just under 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice is ranked No. 1 for lots of race/class interaction and No. 1 for quality of life by the Princeton Review. Rice is also rated as a best value among private universities by Kiplinger’s Personal Finance.