Layered material atomic layers - ultimately thin device materials -
Nanotechnology (Saitama University Research Seed Collection 2025-25 p.107)
Keywords: layered materials, atomic layers, two-dimensional materials, FET, gas sensor
Materials such as graphite, molybdenum disulfide, and black phosphorus have a layered structure formed by unit layers that spread in a two-dimensional plane and are stacked through van der Waals forces. These unit layers, with a thickness of less than 1 nanometer, are also referred to as "layered material atomic layers" and have recently gained attention as ultimately thin semiconductor device materials. Efforts are being made worldwide to realize high-performance field-effect transistors (FETs), gas sensors, photoelectric conversion devices, thermoelectric conversion devices, and more using these atomic layer materials. In the laboratory, research is being conducted to fabricate bulk single crystals and single crystal ultra-thin films of layered materials necessary for the development of these devices, as well as the development of devices such as FETs and gas sensors utilizing them.
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Keiji Ueno, Professor Graduate School of Science and Technology, Department of Materials Science, Field of Material Functions 【Recent Research Themes】 ● Synthesis of bulk single crystals of layered materials with added impurities. ● Growth of single crystal ultrathin films of layered materials. ● Exploration of various physical properties of atomic layers of layered materials. ● Formation and property exploration of atomic layers of layered materials with Janus structures. ● Pursuit of unknown physical phenomena through the formation of heterostructures of layered materials.
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【Appeal Points to the Industry】 ● There is a possibility of realizing ultra-thin FET devices that surpass current silicon devices. ● Nearly 40 years of research experience in layered materials. ● Conducting research on the synthesis of bulk single crystals of chalcogenide-based layered materials, which is rare in Japan. ● Capable of producing a wide variety of bulk single crystals and single-crystal ultra-thin films of layered materials. ● Evaluation of the produced samples can be performed using X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. 【Examples of Practical Applications and Utilization】 ● Development of ultra-thin FETs using atomic layers of layered materials. ● Application of layered material atomic layer FETs as gas sensors. ● Improvement of solar cell device efficiency through the application of layered material atomic layers. ● Exploration and synthesis of layered materials exhibiting novel physical properties.
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Detection of NO2 using a gas sensor based on layered semiconductor 2H-MoTe2.
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.