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- 저자 : Lepró (검색결과 3 건)
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A Reel-Wound Carbon Nanotube Polarizer for Terahertz Frequencies
Kyoung, Jisoo,Jang, Eui Yun,Lima, Má,rcio D.,Park, Hyeong-Ryeol,Robles, Raquel Ovalle,Lepró,, Xavier,Kim, Yong Hyup,Baughman, Ray H.,Kim, Dai-Sik American Chemical Society 2011 NANO LETTERS Vol.11 No.10
<P>Utilizing highly oriented multiwalled carbon nanotube aerogel sheets, we fabricated micrometer-thick freestanding carbon nanotube (CNT) polarizers. Simple winding of nanotube sheets on a U-shaped polyethylene reel enabled rapid and reliable polarizer fabrication, bypassing lithography or chemical etching processes. With the remarkable extinction ratio reaching ∼37 dB in the broad spectral range from 0.1 to 2.0 THz, combined with the extraordinary gravimetric mechanical strength of CNTs, and the dispersionless character of freestanding sheets, the commercialization prospects for our CNT terahertz polarizers appear attractive.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-10/nl202214y/production/images/medium/nl-2011-02214y_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl202214y'>ACS Electronic Supporting Info</A></P>
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All-Solid-State Carbon Nanotube Torsional and Tensile Artificial Muscles
Lee, Jae Ah,Kim, Youn Tae,Spinks, Geoffrey M.,Suh, Dongseok,Lepró,, Xavier,Lima, Má,cio D.,Baughman, Ray H.,Kim, Seon Jeong American Chemical Society 2014 NANO LETTERS Vol.14 No.5
<P>We report electrochemically powered, all-solid-state torsional and tensile artificial yarn muscles using a spinnable carbon nanotube (CNT) sheet that provides attractive performance. Large torsional muscle stroke (53°/mm) with minor hysteresis loop was obtained for a low applied voltage (5 V) without the use of a relatively complex three-electrode electromechanical setup, liquid electrolyte, or packaging. Useful tensile muscle strokes were obtained (1.3% at 2.5 V and 0.52% at 1 V) when lifting loads that are ∼25 times heavier than can be lifted by the same diameter human skeletal muscle. Also, the tensile actuator maintained its contraction following charging and subsequent disconnection from the power supply because of its own supercapacitor property at the same time. Possible eventual applications for the individual tensile and torsional muscles are in micromechanical devices, such as for controlling valves and stirring liquids in microfluidic circuits, and in medical catheters.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-5/nl500526r/production/images/medium/nl-2014-00526r_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl500526r'>ACS Electronic Supporting Info</A></P>
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Ultrastretchable Analog/Digital Signal Transmission Line with Carbon Nanotube Sheets
Lee, Yourack,Joo, Min-Kyu,Le, Viet Thong,Ovalle-Robles, Raquel,Lepró,, Xavier,Lima, Má,rcio D.,Suh, Daniel G.,Yu, Han Young,Lee, Young Hee,Suh, Dongseok American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.31
<P>Stretchable conductors can be used in various applications depending on their own characteristics. Here, we demonstrate simple and robust elastomeric conductors that are optimized for stretchable electrical signal transmission line. They can withstand strains up to 600% without any substantial change in their resistance (<= 10% as is and <= 1% with passivation), and exhibit suppressed charge fluctuations in the medium. The inherent elasticity of a polymeric rubber and the high conductivity of flexible, highly oriented carbon nanotube sheets were combined synergistically, without losing both properties. The nanoscopic strong adhesion between aligned carbon nanotube arrays and strained elastomeric polymers induces conductive wavy folds with microscopic bending of radii on the scale of a few micrometers. Such features enable practical applications such as in elastomeric length-changeable electrical digital and analog signal transmission lines at above MHz frequencies. In addition to reporting basic direct current, alternating current, and noise characterizations of the elastomeric conductors, various examples as a stretchable signal transmission line up to 600% strains are presented by confirming the capability of transmitting audio and video signals, as well as low-frequency medical signals without information distortion.</P>
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