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Home»News»Molybdenene—the ‘metallic’ relative of graphene
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Molybdenene—the ‘metallic’ relative of graphene

September 29, 2023No Comments3 Mins Read
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Molybdenene—the ‘metallic’ relative of graphene
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Electron microscope image of the hair-shaped structures, also known as “whiskers”, which contain the thin molybdenene layers. Credit: Nature Nanotechnology (2023). DOI: 10.1038/s41565-023-01484-2

Two-dimensional materials like graphene show fascinating properties such as superconductivity, extraordinary strength and exotic quantum phenomena. Scientists at Forschungszentrum Jülich, together with partners from the Indian Institute of Technology in Patna and the Australian University of Newcastle, have now created a special material of this kind that exhibits a metallic character. It consists of just one atomic layer of molybdenum atoms and is also referred to as “molybdenene.”

The scientists succeeded in producing a thin sheet of the metal molybdenum, which is just one atomic layer thick. The new material is thus similarly thin as graphene, probably the best-known 2D material. The latter consists of carbon and was first isolated in 2004. The discovery aroused great attention because graphene conducts electricity and heat far better than copper and is a hundred times more stable than steel.

At the same time, it is exceptionally light and flexible. Due to its special 2D structure, graphene also exhibits some unusual electromagnetic effects that could enable groundbreaking innovations in the field of quantum technology.

In recent years, other 2D materials such as phosphorene or germanene have been introduced. Like molybdenene, they exhibit some impressive properties, while the latter still differs from other 2D materials in some aspects. “Many 2D materials are sensitive to heat, but molybdenene is not. Moreover, this is the first metallic 2D material where free-standing layers could be prepared,” explains Prof. Ilia Valov from the Peter Grünberg Institute (PGI-7) at Forschungszentrum Jülich.

Molybdenene – the "metallic" relative of graphene
Electron microscope images of the hair-shaped structures, also known as “whiskers”, which contain the thin molybdenene layers. Credit: Nature Nanotechnology (2023). DOI: 10.1038/s41565-023-01484-2

The researchers created the new 2D material using a microwave, in which they heated a mixture of molybdenum sulfide (MoS2) and graphene to incandescence at a temperature of around 3000 degrees Celsius. In a reaction driven by the microwave electric field, finely branched hair structures were formed in which the tapered molybdenum layers can be found. These are also called “whiskers.”

See also  Researchers develop proton barrier films using pore-free graphene oxide

In first tests, the scientists could already observe a variety of useful properties. “Molybdenene is mechanically extremely stable. It could be used, for example, as a coating for electrodes to make batteries even more powerful and robust,” explains Ilia Valov.

The researchers expect that the material has further exotic electronic properties, similar to graphene, because of its special 2D structure. Due to its metallic character, it also has freely moving electrons. These accumulate on the two side sides of the molybdenene, which makes the material an interesting candidate for catalysts to accelerate chemical reactions.

  • Molybdenene – the "metallic" relative of graphene
    High-resolution electron microscope image of the molybdenene surface. Credit: Nature Nanotechnology (2023). DOI: 10.1038/s41565-023-01484-2
  • Molybdenene – the "metallic" relative of graphene
    Hair-shaped structures of molybdenene (right) are formed in the microwave (left). Credit: Nature Nanotechnology (2023). DOI: 10.1038/s41565-023-01484-2

In collaboration with the Indian Institute of Technology in Patna and the Australian University of Newcastle, the researchers have already been able to develop a practical scientific application for molybdenene. Thanks to its stability and excellent electrical and thermal conductivity, it is ideally suited as a measuring tip for atomic force microscopy (AFM) and surface-enhanced RAMAN spectroscopy (SERS).

Initial sample recordings show that molybdenene offers various advantages over established tip materials and, because of its thin, flat shape, is capable of providing particularly good protection against unwanted interference signals.

Provided by
Forschungszentrum Juelich



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