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Finding the Competitive Edge of 4th Industrial Revolution in ‘Nano Science’
Professor Geunbae Lim of POSTECH Nano&BioMEMS Lab.

World’s first structural coloration technology with low cost and high efficiency
Most colors found in the nature are determined by the object’s own characteristic color. But for some cases, they are determined by physical phenomena such as diffraction or interference of light. These cases include the coloration of peacock tails, patterns found in butterfly wings, and the bluish glow on the beetle shells. We call them ‘structural coloration’.
Although structural coloration is easily found in many cases of nature, it is hard for us humans to replicate the same phenomenon. This is because it takes place in the nanometer scale with extremely small particles and thin films, which cannot be expressed with traditional ink. Of course there has been several attempts at structural coloration, and they were faced with major limitations such as not being able to make changes to the once formed colors and not being able to express various different colors in a single substrate. 
Recently, Professor Geunbae Lim and his fellow researchers in Nano&BioMEMS Lab have developed structural coloration technology using nanostructure for the first time in the world. This technology utilizes nano particles that are smaller than the wavelength of visible light, which causes reflection, refraction and diffraction of the incoming light to form structural coloration. Compared to pre-existing methods this technology is capable of mass manufacturing on large scale areas while being economically beneficial. The technology holds promising applicability to various fields including display technology, small electronics, and anti-forgery printing. Professor Geunbae Lim of POSTECH explained, “The structural coloration technology we have developed is capable of expressing various different colors on a single substrate while being able to make changes to the already formed colors. Also, the coloration process is completely compatible with the traditional semiconductor fabrication techniques, and this would allow applications to biochip sensors afterwards”. This work was carried out with GeonHwee Kim (Ph.D. course), and Professor Taechang Ahn of Mechanical Design Engineering at Andong University. 

“Excellent scalability of nanotechnology will stand out as a world leading trend”
Professor Geunbae Lim has been working on development of various fabrication techniques of micro/nano scale hardware ever since he became a professor at POSTECH. Most notably, he has put enormous effort in studying unique phenomena that takes place in the nano scale and bringing it to the larger scales where it can be applied to our everyday lives. With the development of nanoscale devices with high reproducibility, such technologies include nanoscale pipetting, biosensor, neural electrode, and nano particle separation. Recently, his team is also working on highly sophisticated surgical tools embedding nanotechnologies mentioned above.
His research team developed an inertia sensor fabricated through MEMS technology, which is now being commercialized through co-working companies. One of their work, ‘Gore-Tex technology through nanocrack formations’ has been published as the main featuring article at one of the highly renowned scientific journals. They have developed a ‘motion rehab sensor’ which is in progress for technology transfer to hospitals and venture businesses. His team also began the R&D step of the original technology of high speed water filter and bio-extractor using electric field.
Professor Geunbae Lim explained, “Nowadays I am interested in research topics that has a great competitive edge only with a little resource and facilities. For instance, the nanowire fabrication technology using electric field greatly surpasses traditional technologies while being considerably cheaper.” This work is currently under commercialization process with research centers and venture companies. He emphasized that this point is the biggest merit of studying nanotechnology: accomplishing what no one has ever succeeded before and acquiring the competitive edge that will lead the 4th industrial revolution.
He insists that his ultimate role as a researcher of science and engineering is to dedicate his abilities to make the world a better place. He believes that it is important to first get recognition by developing a beneficial technology and ultimately pursue practical application and commercialization of the developed technology. Also, he didn’t forget to mention there needs a systematical support and interest from the government. He mentioned, “I feel that the level of our research results and technology is almost on par with those of other advanced countries and I believe our young researchers can show off their capabilities and make world leading research results with the help of the systematical support”. We hope that all the efforts these young researchers are putting into are paid off with world leading technologies and eventually drive Korea to be a leader in the scientific research field.


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