Researcher Information

Sho Fujii

Assistant Professor

Directing an incompatible boundary: Interface chemistry of microbubbles

Department of Chemistry, Inorganic and Analytical Chemistry

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ThemeSimple arrangement of nanomaterials and molecules utilizing phenomena occurring at microbubble interface and search for chemical reaction using microbubbles
FieldInterface chemistry, Electrochemistry, Coordination chemistry, Photochemistry
KeywordMicrobubble, Laser, Surface tention, Marangoni convection, Patterning, Laser manipulation, Multi-electron transfer

Introduction of Research

Heating water provides bubbles. Although this is an ordinary phenomenon, there are various discoveries when looking at microscale. The solid-liquid interface is locally heated with laser light, and then microbubbles (several micrometers in diameter) formed on the solid surface. Marangoni convection arising from the surface tension gradient of the gas-liquid interface is generated around the microbubble, and substances are attracted to the microbubble interface. In particular, substances are concentrated and accumulated at the three-phase contact line where solid / liquid / gas intersect. We found this phenomenon unexpectedly, and tried the development of methods of manipulation and integration of molecules and nanomaterials that can not be grasped by hand. We have found that stretching and pinning manipulation of single DNA molecule, DNA wiring, patterning of nanoparticles, crystallization of molecules have been carried out by using the microbubble. We aim to contribute to the realization of molecular electronics based on the bottom-up approach by developing these technologies. Moreover, it has found that the chemical reaction proceeds at the three-phase contact line. In addition to studying the reaction mechanism, we try to make effective use of microbubbles.

Representative Achievements

Simultaneous Formation and Spatial Patterning of ZnO on ITO Surfaces by Local Laser-Induced Generation of Microbubbles in Aqueous Solutions of [Zn(NH3)4]2+, S. Fujii, R. Fukano, Y. Hayami, H. Ozawa, E. Muneyuki, N. Kitamura, and M. Haga, ACS Appl. Mater. Interfaces, 2017, 9, 8413–8419.
Characterization of Platinum Electrode Surfaces by Electrochemical Surface Forces Measurement, S. Fujii, M. Kasuya, K. Kurihara, J. Phys. Chem. C, 2017, 121, 26406–26413.
Quasi-One-Step Six-Electron Electrochemical Reduction of an Octahedral Hexanuclear Molybdenum(II) Cluster, S. Fujii, T. Horiguchi, S. Akagi, N. Kitamura, Inorg. Chem., 2016, 55, 10259–10266.
Fabrication and Placement of a Ring Structure of Nanoparticles by a Laser induced micro-nanobubble on a Gold Surface, S. Fujii, K. Kanaizuka, S. Toyabe, K. Kobayashi, E. Muneyuki, M. Haga, Langmuir, 2011, 27, 8605–8610.
Manipulation of Single DNA Using a Micronano Bubble Formed by Local Laser Heating on an Au-Coated Surface, S. Fujii, K. Kobayashi, K. Kanaizuka, T. Okamoto, S. Toyabe, E. Muneyuki, M. Haga, Chem. Lett., 2010, 39, 92–93.
Academic degreePh.D.
Academic backgroundApr 2015 - Assistant Professor, Department of Chemistry, Faculty of Science, Hokkaido University
Jun 2013 - Mar 2015 Research Associate, Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University
Apr 2012 - May 2013 Research Associate, Advanced Institute for Materials Research (AIMR), Tohoku University
Apr 2010 - Mar 2012 JSPS Research Fellow (DC2)
Apr 2007 - Mar 2012 Applied Chemistry, Graduate School of Science and Engineering, Chuo University
Apr 2003 - Mar 2007 Applied Chemistry, Faculty of Science and Engineering, Chuo University
Affiliated academic societyThe Chemical Society of Japan, The Japan Society for Analytical Chemistry, The Japan Society of Applied Physics, Japan Society of Coordination Chemistry