Our research focuses on micro/nanomaterial integrations based on electrical, material, mechanical, and neural engineering. The contributions of the research are “translational nanotechnology” to show the possibilities of a combination of top-down and bottom-up nano/micro materials and their device integrations. Our principal achievements are 1) CMOS/MEMS neural devices, 2) high-performance transistors on Si and their device physics, 3) macroscale flexible electronics for flexible, high-performance, and low-power electronics, 4) human-interactive wearable devices, and 5) brain machine interfaces.

If you would like to admit Osaka Prefecture University and join our group, please submit your application as you can find more detail here "Admission guidelines for international students". Application deadline is June and December for admission in October and April, respectively. Also there are some scholarships for the international students to support tuition and living cost. For more detail, please contact to Prof. Takei.

If you are interested in this group to work together as a postdoctoral fellow, there is a postdoctoral fellowship program for foreigners supported by Japan Society for the Promotion of Science. We also accept talented visiting students/researchers as well. Please email your CV to Prof. Takei. 


April 10th, 2018 Prof. Takei won the Young Scientists' Prize of the commendation for Science and Technology by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
Aug. 23rd, 2017 The paper about e-wallpaper is accepted in Materials Horizons.
May 30th, 2017 The paper about healthcare patch is accepted in Advanced Healthcare Materials.
April 10th, 2017 The paper about flexible healthcare sensor sheet is accepted in Advanced Materials Technologies.
March 3rd, 2017 The paper about flexible pH and temperature sensors is accepted in ACS Sensors.
Dec. 5th, 2016 Prof. Takei delivered an invited talk at IEDM 2016.
Oct. 21st, 2016 The paper about flexible device is accepted in Science Advances.
Sep. 9th, 2016 The paper about flexilbe memory is accepted in Journal of Materials Chemistry C.
Jul. 8th, 2016 Prof. Takei won the EMS award from the 35th Electronic Materials Symposium.
May 5th, 2016 The paper about flexible circuits is accepted in Advanced Materials Technologies.
Mar. 10th, 2016 The paper about e-skin is accepted in PSS A.
Dec. 10th, 2015 Prof. Takei was selected as one of "NISTEP researcher" selected by National Institute of Science and Technology Policy, Ministry of Education, Culture, Sports, Science and Technology (MEXT), JAPAN.  
Sep. 16th, 2015 The paper about flexible circuits is accepted in Scientific Reports.
July 31st, 2015 Prof. Takei won the ATI research award.
July 9th, 2015 Prof. Takei joins Nanoscale Research Letters as an Associate Editor. 
June 8th, 2015 The paper about a flexible 3D CMOS is accepted in Advanced Materials.
May 5th, 2015 The paper about a pNIPAM actuator is accepted in ACS Applied Materials & Interfaces.
April 21st, 2015 The paper about a liquid metal is accepted in Advanced Electronic Materials.
Mar. 19th, 2015 The paper about a bendable e-skin is accepted in RSC Advances.
Dec. 2nd, 2014 The paper about an e-skin is accepted in ACS Nano.
Nov. 5th, 2014 The invited "Progress Report" paper about the wearable healthcare device is accepted in Advanced Healthcare Materials.
Aug. 7th, 2014 Prof. Takei was nominated for 2014 World Technology Award.
July 31st, 2014 The published paper about the smart bandage in Advanced Functional Materials is selected as one of the most accessed paper in June, 2014.
July 16th, 2014 The paper about the superhydrophobic surface is accepted in BioNanoScience.
July 15th, 2014 Prof. Takei joins the editorial board of Scientific Reports (Nature Publishing Group). 
July 10th, 2014 The paper about the printable and foldable electrode is accepted in Physica Status Solidi A.
June 6th, 2014 The image of the paper about a smart bandage is selected for the frontispiece of Advanced Functional Materials.
April 24th, 2014 The paper about the printable e-whisker is featured in ACS Nano "In Nano".
March 1st, 2013 The paper about the printable artificial electronic whisker is accepted in ACS Nano.
Dec. 25th, 2013 The paper about the smart bandage is accepted in Advanced Functional Materials.
Nov. 20th, 2013   Prof. Takei wins one of awards (Special award) at the symposium of Nature Industry Award organized by Osaka Science and Technology Center.
Aug. 21st, 2013   Prof. Takei is named a 35 Top Young Innovators under 35 (TR35) selected by MIT Technology Review.

Selected publications (Full publication list is here)
Flexible electronics
1. K. Takei et al. “Nanowire Active Matrix Circuitry for Low-Voltage Macro-Scale Artificial Skin”, Nature Materials, Vol. 9, pp. 821-826, 2010.

2. T. Takahashi*, K. Takei*, et al., Parallelarray InAs nanowire transistors for mechanically bendable, ultra high frequencyelectronics”, ACS Nano, Vol. 4, pp. 5855-5860, 2010. *Authors equally contributed.

3.  K. Takei et al. "Highly sensitive electronic whiskers based on patterned carbon nanotube and silver nanoparticle composite films", Proceedings of the National Academy of Sciences (PNAS), Vol. 111, pp. 1703-1707, 2014.

High performance electronics (XOI)
1. H. Ko*, K. Takei*, R. Kapadia*, et al.  “Ultrathin compound semiconductor on insulator layers for highperformance nanoscale transistors”, Nature, Vol. 468, pp. 286-289, 2010. *Authors equally contributed.

2. K. Takei*, H. Fang*, S.B. Kumar* et al. “Quantum confinement effects in nanoscale-thickness InAs membranes”, Nano Letters, Vol. 11, pp.5008-5012, 2011. *Authors equally contributed.

3. K. Takei et al. “Benchmarking the performance ofultrathin body InAs-on-insulator transistors as a function of body thickness”, Applied Physics Letters,Vol. 99 , p.103507, 2011.

4. K. Takei et al. Nanoscale InGaSb heterostructure membranes on Si substratesfor high hole mobility transistors”, Nano Letters, Vol. 12, pp. 2060-2066, 2012.

Bio/neural applications
1. K. Takei et al., “Microtube-based electrode arrays for low invasive extracellular recording with a high signal-to-noise ratio”, Biomedical Microdevices, Vol. 12, pp. 41-48, 2010.

2. K. Takei et al., “Out-of-plane microtubearrays for drug delivery – Liquid flow properties and an application to thenerve block test”, Biomedical Microdevices, Vol. 11, pp. 539-545, 2009.
Microfabrications (MEMS)
1. K. Takei et al., “Integration of out-of-plane silicon dioxide microtubes, silicon microprobes, and on-chip NMOSFETs by selective vapor-liquid-solid growth”, Journal of Micromechanics and Microengineering, Vol. 18, p. 035033, 2008.

2. K. Takei et al., “Out-of-plane tube arrays for biomedical sensors using vapor-liquid-solid growth method”, IEEE Sensors, Journal, Vol. 5, pp. 470-475, 2008.