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Department of Energy and Environment

Promoting green innovation

To promote green innovation, AIST is developing technologies for increased use of alternative energy technologies, such as renewable energy sources that reduce greenhouse gas emissions (energy creation), high-density storage of energy (energy storage), highly efficient conversion and use of energy (energy saving), effective utilization of energy resources, and evaluation and reduction of environmental risks.

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New Research Results

Development of an Evaluation Technique for Chemical Toxicity Capable of Rapidly Processing Many Samples

AIST has developed a technique to evaluate the toxicity of chemicals in an easy and rapid manner, utilizing the fact that the RNA degradation rate in human cells decreases when toxicity is present. The researchers designed and synthesized a fluorescent probe, with a fluorescent dye on one of double-stranded RNA chains and a quencher dye on the other chain. In a system with a toxic chemical, the rate of RNA degradation is low and fluorescence remains quenched. However, fluorescence is emitted in a system without a toxic chemical. It is possible to determine the toxicity of the added chemical in two hours.

Figure;The fluorescence intensity of the probe increases in response to RNA degradation.

The fluorescence intensity of the probe increases in response to RNA degradation.

Development of new evaluation technique for nanowires

AIST has measured the Hall coefficient of a bismuth nanowire using the microfabrication technology combining focused ion beam (FIB) technology and scanning electron microscopy (SEM). A bismuth nanowire having a diameter of 700 nm was formed and nanoelectrodes were fabricated on the nanowire using an FIB-SEM apparatus. The Hall coefficient of the nanowire was measured. The results provided experimental verification that carrier mobility was significantly reduced as compared with bulk bismuth. The fabrication of bismuth nanowires having smaller diameters is in progress. Using the developed electrode fabrication technique, the researchers aim to observe the effect due to a nanowire structure.

Process for fabricating electrodes on bismuth nanowire in quartz glass figure

Process for fabricating electrodes on bismuth nanowire in quartz glass


Research Unit


Open Innovation Laboratory

Since FY 2016, as a part of the “Open Innovation Arena concept” promoted by the Ministry of Economy, Trade and Industry (METI), AIST has been engaged in the provision of “Open Innovation Laboratories” (OILs), which are collaborative research centers established on university campuses.

AIST will merge the basic research carried out at universities, etc. with AIST’s goal-oriented basic research and applied technology development, and will promote bridging research and development and industry by the establishment of OILs.

  • AIST-NU GaN Advanced Device Open Innovation Laboratory (GaN-OIL)

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