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Wang, Chuan,Chien, Jun-Chau,Takei, Kuniharu,Takahashi, Toshitake,Nah, Junghyo,Niknejad, Ali M.,Javey, Ali American ChemicalSociety 2012 Nano letters Vol.12 No.3
<P>Solution-processed thin-films of semiconducting carbonnanotubesas the channel material for flexible electronics simultaneously offershigh performance, low cost, and ambient stability, which significantlyoutruns the organic semiconductor materials. In this work, we reportthe use of semiconductor-enriched carbon nanotubes for high-performanceintegrated circuits on mechanically flexible substrates for digital,analog and radio frequency applications. The as-obtained thin-filmtransistors (TFTs) exhibit highly uniform device performance withon-current and transconductance up to 15 μA/μm and 4 μS/μm.By performing capacitance–voltage measurements, the gate capacitanceof the nanotube TFT is precisely extracted and the corresponding peakeffective device mobility is evaluated to be around 50 cm<SUP>2</SUP>V<SUP>–1</SUP>s<SUP>–1</SUP>. Using such devices, digitallogic gates including inverters, NAND, and NOR gates with superiorbending stability have been demonstrated. Moreover, radio frequencymeasurements show that cutoff frequency of 170 MHz can be achievedin devices with a relatively long channel length of 4 μm, whichis sufficient for certain wireless communication applications. Thisproof-of-concept demonstration indicates that our platform can serveas a foundation for scalable, low-cost, high-performance flexibleelectronics.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-3/nl2043375/production/images/medium/nl-2011-043375_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl2043375'>ACS Electronic Supporting Info</A></P>
Parallel Array InAs Nanowire Transistors for Mechanically Bendable, Ultrahigh Frequency Electronics
Takahashi, Toshitake,Takei, Kuniharu,Adabi, Ehsan,Fan, Zhiyong,Niknejad, Ali M.,Javey, Ali American Chemical Society 2010 ACS NANO Vol.4 No.10
<P>The radio frequency response of InAs nanowire array transistors on mechanically flexible substrates is characterized. For the first time, GHz device operation of nanowire arrays is demonstrated, despite the relatively long channel lengths of ∼1.5 μm used in this work. Specifically, the transistors exhibit an impressive maximum frequency of oscillation, <I>f</I><SUB>max</SUB> ∼ 1.8 GHz, and a cutoff frequency, <I>f</I><SUB>t</SUB> ∼ 1 GHz. The high-frequency response of the devices is due to the high saturation velocity of electrons in high-mobility InAs nanowires. The work presents a new platform for flexible, ultrahigh frequency devices with potential applications in high-performance digital and analog circuitry.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-10/nn1018329/production/images/medium/nn-2010-018329_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn1018329'>ACS Electronic Supporting Info</A></P>
Y. Liu,S. Hashimoto,K. Yasumoto,K. Takei,M. Mori,Y. Funahashi,Y. Fijishiro,A. Hirano,Y. Takeda 한국물리학회 2009 Current Applied Physics Vol.9 No.11
The catalytic activity of the La0.6Sr0.4CoxFe1-xO3-δ (x = 0.2) perovskite cathode was significantly improved by introducing Ag. This strongly depends on the particle size of Ag that relates to the synthesis route. The Ag particles in nano-range were in situ incorporated into the La0.6Sr0.4Co0.2Fe0.8O3-δ based cathode using a novel infiltration. The functional cathode was successfully operated on the anode-supported cell with a ceria thin-electrolyte resulting in a higher cell output at 500 ℃. Durability of the cell was evaluated within a short-term period. The catalytic activity of the La0.6Sr0.4CoxFe1-xO3-δ (x = 0.2) perovskite cathode was significantly improved by introducing Ag. This strongly depends on the particle size of Ag that relates to the synthesis route. The Ag particles in nano-range were in situ incorporated into the La0.6Sr0.4Co0.2Fe0.8O3-δ based cathode using a novel infiltration. The functional cathode was successfully operated on the anode-supported cell with a ceria thin-electrolyte resulting in a higher cell output at 500 ℃. Durability of the cell was evaluated within a short-term period.
Wang, Chuan,Chien, Jun-Chau,Fang, Hui,Takei, Kuniharu,Nah, Junghyo,Plis, E.,Krishna, Sanjay,Niknejad, Ali M.,Javey, Ali American Chemical Society 2012 Nano letters Vol.12 No.8
<P>This paper reports the radio frequency (RF) performance of InAs nanomembrane transistors on both mechanically rigid and flexible substrates. We have employed a self-aligned device architecture by using a T-shaped gate structure to fabricate high performance InAs metal-oxide-semiconductor field-effect transistors (MOSFETs) with channel lengths down to 75 nm. RF measurements reveal that the InAs devices made on a silicon substrate exhibit a cutoff frequency (<I>f</I><SUB>t</SUB>) of ∼165 GHz, which is one of the best results achieved in III–V MOSFETs on silicon. Similarly, the devices fabricated on a bendable polyimide substrate provide a <I>f</I><SUB>t</SUB> of ∼105 GHz, representing the best performance achieved for transistors fabricated directly on mechanically flexible substrates. The results demonstrate the potential of III–V-on-insulator platform for extremely high-frequency (EHF) electronics on both conventional silicon and flexible substrates.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-8/nl301699k/production/images/medium/nl-2012-01699k_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl301699k'>ACS Electronic Supporting Info</A></P>
Flow Analysis around a Floating Cylinder in a Swirl Flow with a Stereoscopic-PIV
Doh D.H(도덕희),Hwang T.G(황태규),Tanaka K(다나카 코지),Takei M(타께이 마사) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The flow characteristics around a floating cylinder in a swirling flow field in a vertical pipe with a length of 600㎜ and an inner diameter of 100mm is investigated by the use of the Stereoscopic-PIV system. The measurement system consists of two cameras, a Nd-Yag laser and a host computer. Optical sensors(LEDs) were used to detect the location of the floating cylinder and to activate the Stereoscopic-PIV system. A conditional sampling Stereoscopic-PIV system was developed in which the flow fields around the floating cylinder are measured at the events of the activations. It has been verified that the motion of the floating cylinder becomes stable when the azimuthal velocity component of the swirl flow is maintained at stable states.
Doh, D. H.,Jo, H. J.,Hwang, T. G.,Koo, B. Y.,Takei, M.,Tanaka, T.,Uemura, T. Taylor Francis 2009 Chemical engineering communications Vol.196 No.12
<P> An adaptive stereoscopic-PIV system has been constructed for flow analyses around a cylinder body (length = 60 mm, diameter = 10 mm, polystyrene). The body is floated by the swirling flows in a vertical pipe with a length of 1100 mm and an inner diameter of 100 mm. Four optical sensors (LEDs) were installed onto the pipe wall to detect the posture of the cylinder body. The constructed stereoscopic-PIV system is activated by the signals of the optical sensors when the cylinder is in the upright posture. The measurement system consists of two cameras, a Nd-Yag laser, and a host computer. Flow characteristics around the floating cylinder body and the motional characteristics of the body itself are investigated when the body is in the upright posture. It has been verified that the motion of the floating cylinder becomes stable when the azimuthal velocity component (W component) of the swirl flow is maintained at stable states.</P>
Jung, T.Y.,Pham, T.N.N.,Umeyama, A.,Shoji, N.,Hashimoto, T.,Lee, J.J.,Takei, M. North-Holland ; Elsevier Science Ltd 2010 european journal of pharmacology Vol.643 No.2
Ursolic acid is triterpene isolated from Uncaria rhynchophylla and is a pharmacologically active substance. The induction of dendritic cell maturation is critical for the induction of Ag-specific T-lymphocyte response and may be essential for the development of human vaccine relying on T cell immunity. In this study, we investigated that the effect of Ursolic acid on the phenotypic and functional maturation of human monocyte-derived dendritic cells in vitro. Dendritic cells harvested on day 8 were examined using functional assay. The expression levels of CD1a, CD80, CD83, CD86, HLA-DR and CCR7 on Ursolic acid-primed dendritic cells was slightly enhanced. Ursolic acid dose-dependently enhanced the T cell stimulatory capacity in an allogeneic mixed lymphocyte reaction, as measured by T cell proliferation. The production of IL-12p70 induced by Ursolic acid-primed dendritic cells was inhibited by the anti-Toll-like receptor-2 (TLR2) mAb and anti-TLR4 mAb. Moreover, Ursolic acid-primed dendritic cells expressed levels of mRNA coding for both TLR2 and TLR4. The majority of cells produced considerable interferon-gamma (IFN-γ), but also small amounts of interleukin (IL-4)-4. Ursolic acid-primed dendritic cells have an intermediate migratory capacity towards CCL19 and CCL21. These results suggest that Ursolic acid modulates human dendritic cells function in a fashion that favors Th1 polarization via the activation of IL-12p70 dependent on TLR2 and/or TLR4, and may be used on dendritic cells-based vaccines for cancer immunotherapy.