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Maesoon Im,Jae-Hyuk Ahn,Jin-Woo Han,Tae Jung Park,Sang Yup Lee,Yang-Kyu Choi IEEE 2011 IEEE SENSORS JOURNAL Vol.11 No.2
<P>Label-free electrical detection of avian influenza (AI) is demonstrated for the development of a point-of-care testing (POCT) platform. For a new POCT platform, a novel field effect transistor (FET)-based biosensor array was fabricated with conventional complementary metal-oxide-semiconductor (CMOS) technology. Nanogap-embedded separated double-gate FETs (nanogap-DGFETs) were realized in a 6×6 array as a biosensor cartridge. Moreover, the low-noise readout circuit was designed and fabricated using a 0.35- μm standard CMOS process. The AI antigen and antibody were bound with the aid of silica-binding proteins (SBP) in the nanogap of the biosensor device. Because the gate dielectric constant was increased by the immobilized biomolecules, the threshold voltage of the nanogap-DGFET was reduced while the drain-to-source current was enhanced. Drain-to-source currents of the nanogap-DGFET array were successfully acquired using the fabricated readout circuitry and measurement setup. This platform is suitable for a simple and effective label-free detection of AI in POCT applications.</P>
Multiple-Gate CMOS Thin-Film Transistor With Polysilicon Nanowire
Maesoon Im,Jin-Woo Han,Hyunjin Lee,Lee-Eun Yu,Sungho Kim,Chang-Hoon Kim,Sang Cheol Jeon,Kwang Hee Kim,Gi Sung Lee,Jae Sub Oh,Yun Chang Park,Hee Mok Lee,Yang-Kyu Choi IEEE 2008 IEEE electron device letters Vol.29 No.1
<P>An ultimately scaled multiple-gate CMOS thin-film transistor with a polysilicon (poly-Si) nanowire demonstrates feasibility for vertical integration using multiple active layers for application in the terabit memory era. The short-channel effects are suppressed using a multiple gate to wrap around the nanowire in devices with a size of a few tenths of a nanometer. The switching and output characteristics show high device performance without a crystallization process for the poly-Si nanowire.</P>
Im, Maesoon,Im, Hown,Lee, Joo-Hyung,Yoon, Jun-Bo,Choi, Yang-Kyu Royal Society of Chemistry 2010 SOFT MATTER Vol.6 No.7
<P>A robust superhydrophobic and superoleophobic surface is demonstrated. On a large-size template of the transparent polydimethylsiloxane (PDMS) elastomer surface, perfectly ordered microstructures with an inverse-trapezoidal cross section are fabricated with two consecutive PDMS replication processes and a three-dimensional diffuser lithography technique. The hydrophobicity and transparency were improved by additional coating of a fluoropolymer layer. The robustness of superhydrophobicity was confirmed by the water droplet impinging test. This transparent, flexible, and superhydrophobic surface provides a new approach for self-cleaning surfaces.</P> <P>Graphic Abstract</P><P>A robust superhydrophobic and superoleophobic surface is demonstrated on transparent polydimethylsiloxane elastomer. Perfectly-ordered microstructures with an inverse-trapezoidal cross-section are fabricated with PDMS replication processes and a three-dimensional diffuser lithography technique. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b925970h'> </P>
Self-cleaning effect of highly water-repellent microshell structures for solar cell applications
Park, Yong-Bum,Im, Hwon,Im, Maesoon,Choi, Yang-Kyu Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.3
<P>A self-cleaning effect developed through the use of a superhydrophobic and water-repellent surface was demonstrated for solar cell applications. A perfectly ordered microshell array was fabricated on a transparent and flexible polydimethylsiloxane (PDMS) elastomer surface. This microshell PDMS showed an excellent water-repellent property with a contact angle (CA) higher than 150° and a hysteresis of lower than 20°, even without the aid of a low surface energy chemical coating. Fabricated superhydrophobic microshell PDMS showed a superior dust cleaning effect compared to that of flat PDMS, preventing the degradation by dust particles of solar cell efficiency. This transparent, flexible and superhydrophobic microshell PDMS surface provides feasibility for a practical application of superhydrophobic surfaces in solar cells.</P> <P>Graphic Abstract</P><P>Superhydrophobic microshell PDMS showed a superior dust-cleaning effect compared to that of flat PDMS, preventing the degradation of solar cell efficiency. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm02463e'> </P>
“Lock-and-Key” Geometry Effect of Patterned Surfaces: Wettability and Switching of Adhesive Force
Huang, Xing-Jiu,Kim, Dong-Haan,Im, Maesoon,Lee, Joo-Hyung,Yoon, J.-B.,Choi, Yang-Kyu WILEY-VCH Verlag 2009 Small Vol.5 No.1
<B>Graphic Abstract</B> <P>A new type of “lock-and-key” patterned surface consisting of dense arrays of microfabricated PDMS lens and bowl arrays (see image) without silanization for the wettability and switching of adhesive forces is presented. The microlens-arrayed surface (lock) shows a low contact angle and a high adhesive force following the Wenzel state, whilst the imprinted microbowl-arrayed surfaces (key), which were replicas of the microlenses, exhibit a high contact angle and an anti-adhesive behavior following the Cassie–Baxter state. <img src='wiley_img/16136810-2009-5-1-SMLL200800649-content.gif' alt='wiley_img/16136810-2009-5-1-SMLL200800649-content'> </P>
Ren, Hong-Xuan,Chen, Xing,Huang, Xing-Jiu,Im, Maesoon,Kim, Dong-Haan,Lee, Joo-Hyung,Yoon, Jun-Bo,Gu, Ning,Liu, Jin-Huai,Choi, Yang-Kyu Royal Society of Chemistry 2009 Lab on a chip Vol.9 No.15
<P>We use a conventional and straightforward route to fabricate scalable morphology-controlled regular structures. This route is based on the etching of PDMS microlens array in CF<SUB>4</SUB> and CF<SUB>4</SUB>/O<SUB>2</SUB> plasma. PDMS microlens array can be changed to regularly isolated microdot structures array in CF<SUB>4</SUB> plasma. Microbowl shaped structures array can be reached in CF<SUB>4</SUB>/O<SUB>2</SUB> plasma. Moreover, a set of structures after CF<SUB>4</SUB> plasma treatment display superhydrophobicity, while a set of structures after CF<SUB>4</SUB>/O<SUB>2</SUB> plasma treatment present hydrophilicity. DNA molecules can be readily enriched on the hydrophilic surface. We believe that the regular structure array surfaces provide a useful inspiration towards biomolecular detection and transportation in biochips.</P> <P>Graphic Abstract</P><P>Morphology-controlled regular structures and their opposite wettabilities can be obtained based on the etching of PDMS microlens array in CF<SUB>4</SUB> and CF<SUB>4</SUB>/O<SUB>2</SUB> plasma. DNA molecules enrichment is also investigated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b905804d'> </P>
Choi, Kyungyong,Kim, Jee-Yeon,Ahn, Jae-Hyuk,Choi, Ji-Min,Im, Maesoon,Choi, Yang-Kyu Royal Society of Chemistry 2012 Lab on a chip Vol.12 No.8
<P>A new platform for lab-on-a-chip system is suggested that utilizes a biosensor array embedded in a digital microfluidic device. With field effect transistor (FET)-based biosensors embedded in the middle of droplet-driving electrodes, the proposed digital microfluidic device can electrically detect avian influenza antibody (anti-AI) in real time by tracing the drain current of the FET-based biosensor without a labeling process. Digitized transport of a target droplet enclosing anti-AI from an inlet to the embedded sensor is enabled by the actuation of electrowetting-on-dielectrics (EWOD). A reduction of the drain current is observed when the target droplet is merged with a pre-existing droplet on the embedded sensor. This reduction of the drain current is attributed to the specific binding of the antigen and the antibody of the AI. The proposed hybrid device consisting of the FET-based sensor and an EWOD device, built on a coplanar substrate by monolithic integration, is fully compatible with current fabrication technology for control and read-out circuitry. Such a completely electrical manner of inducing the transport of bio-molecules, the detection of bio-molecules, the recording of signals, signal processing, and the data transmission process does not require a pump, a fluidic channel, or a bulky transducer. Thus, the proposed platform can contribute to the construction of an all-in-one chip.</P>
Han, Jin-Woo,Ryu, Seong-Wan,Kim, Chung-Jin,Kim, Sungho,Im, Maesoon,Choi, Sung Jin,Kim, Jin Soo,Kim, Kwang Hee,Lee, Gi Sung,Oh, Jae Sub,Song, Myeong Ho,Park, Yun Chang,Kim, Jeoung Woo,Choi, Yang-Kyu IEEE 2008 IEEE electron device letters Vol.29 No.7
<P> Unified random access memory (URAM) is demonstrated for the first time. The novel partially depleted (PD) SONOS FinFET provides unified function of a high-speed capacitorless 1T DRAM and a nonvolatile memory (NVM). The combination of an oxide/nitride/oxide (O/N/O) layer and a floating-body facilitates URAM operation in PD SONOS FinFETs. An NVM function is achieved by FN tunneling into the O/N/O stack and, a 1T-DRAM function is achieved by excessive-hole accumulation in the PD body. The fabricated PD SONOS FinFET shows retention time exceeding 10 years for NVM operation and program/erase time below 6 ns for 1T-DRAM in a single-cell transistor. These two memory functions are guaranteed without disturbance between them. </P>
Jee-Yeon Kim,Jae-Hyuk Ahn,Sung-Jin Choi,Maesoon Im,Sungho Kim,Duarte, J. P.,Chang-Hoon Kim,Tae Jung Park,Sang Yup Lee,Yang-Kyu Choi IEEE 2012 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.11 No.2
<P>An underlap channel-embedded FET is proposed for electrical, label-free biosensor in both watery and dry environments, and current-voltage characteristics measured under each environment are compared. To investigate the effectiveness of the underlap device as a biosensor for both environments, antigen-antibody binding of an avian influenza (AI) is used. Antibody of AI binding on antigen-immobilized surface provides additional negative charge on underlap surface, and they give rise to channel potential increasing and result in drain current reduction. In this study, we have verified that the biosensor characteristics measured under dry environment is valid as much as they are valid for watery environment.</P>