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Truong, Thuy-Kieu,Park, Ji Hyun,Rahman, MD Asiqur,Urbanski, Martin,Kim, Eun Sung,Scalia, Giusy,Suh, Dongseok ELSEVIER 2019 CURRENT APPLIED PHYSICS Vol.19 No.2
<P><B>Abstract</B></P> <P>The use of a highly aligned carbon nanotube (CNT) sheet as a multifunctional constituent for liquid crystal (LC) displays and electro-optic LC applications is assessed. The CNT sheet can perform a dual function: one is an alignment layer for LCs, replacing the commonly used rubbed polyimide film, and the other is a transparent conductive layer, taking the place of indium tin oxide. The hydrophobic treatment improved the adhesion quality between aligned CNT bundles and the glass substrate, which helps to preserve the inherently aligned nanogroove morphology of transparent CNT sheets. The test LC display cells, comprising 4-cyano-4′-pentylbiphenyl molecules sandwiched between CNT-sheet-on-glass substrates, demonstrate the operation characteristics comparable to that of the conventional cell under temperature variation and ac electric field of 1 kHz. The results offer a possibility of deploying multifunctional CNT-sheet alignment layers in LC-based devices, especially in the future flexible display applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dry-spun aligned carbon nanotube sheets as an electrode in the liquid crystal cell. </LI> <LI> CNT sheet plays a dual role: an alignment layer and a transparent conductor. </LI> <LI> Inherently-formed nanogrooves in the dry-spun CNT sheet good for LC alignment. </LI> <LI> A systematic assessment of CNT-sheet-electrode LC cell in a dynamic mode. </LI> <LI> Future possible application of dry-spun CNT-sheet electrode for flexible display. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Thuy Kieu Truong,박지현,MD Asiqur Rahman,Martin Urbanski,김은성,Giusy Scalia,서동석 한국물리학회 2019 Current Applied Physics Vol.19 No.2
The use of a highly aligned carbon nanotube (CNT) sheet as a multifunctional constituent for liquid crystal (LC) displays and electro-optic LC applications is assessed. The CNT sheet can perform a dual function: one is an alignment layer for LCs, replacing the commonly used rubbed polyimide film, and the other is a transparent conductive layer, taking the place of indium tin oxide. The hydrophobic treatment improved the adhesion quality between aligned CNT bundles and the glass substrate, which helps to preserve the inherently aligned nanogroove morphology of transparent CNT sheets. The test LC display cells, comprising 4-cyano-4′-pentylbiphenyl molecules sandwiched between CNT-sheet-on-glass substrates, demonstrate the operation characteristics comparable to that of the conventional cell under temperature variation and ac electric field of 1 kHz. The results offer a possibility of deploying multifunctional CNT-sheet alignment layers in LC-based devices, especially in the future flexible display applications.
Multifunctional characterization of carbon nanotube sheets, yarns, and their composites
Thuy Kieu Truong,Yourack Lee,서동석 한국물리학회 2016 Current Applied Physics Vol.16 No.9
Carbon nanotube (CNT) based macroscopic objects such as dry-state free-standing sheets and yarns have attracted much attention during more than a decade for their multifunctional features. Thanks to their lightweight, highly conductive, mechanically strong and flexible properties, various applications had been explored so far. However, because of the difficulties in the spinnable CNT forest growth, the sample availability in the academic fields has been quite limited. In this report, various properties of CNT sheets, yarns, and their composites were experimentally presented using the samples prepared from the spinnable CNT forest grown in the newly installed, acetylene-based, chemical-vapor-deposition chamber system. Clear observation of the dimensional effect on the charge transport through CNTs, the enhancement of electro-mechanical actuation owing the volume-expandable infiltration material inside CNTs, and other exemplary evaluations proved the versatility of this macroscopic assembly as well as the good quality of our sample.
Thuy Kieu Truong,T. N. T. Nguyen,TranQuangTrung,손일융,김덕진,정진혁,이내응 한국물리학회 2014 Current Applied Physics Vol.14 No.5
In this study, the reduced graphene oxide field-effect transistor (rGO FET) with indium tin oxide (ITO) extended gate electrode was demonstrated as a transducer for proton sensing application. In this structure, the proton sensing area of the ITO extended gate electrode is isolated from the active area of the rGO FET. The proton sensing properties based on the rGO FET transducer were analyzed. The rGO FET device with encapsulation by a tetratetracontane (TTC) layer showed good stability in electrolytic solutions. The device showed an ambipolar behavior with shifts in Dirac point as the pH of the electrolyte is varied. The pH sensitivity based on the Dirac point shift as a sensing parameter was about 43e50 mV/pH for a wide range of pH values from 2 to 12. The ITO extended gate rGO FET may be considered a potential transducer for sensing of Hþ in electrolytes. Its sensing area can be modified further for various ions sensing applications.
Rahman, MD. Asiqur,Agha, Hakam,Truong, Thuy-Kieu,Park, Ji Hyun,Suh, Dongseok,Scalia, Giusy Elsevier 2018 Journal of molecular liquids Vol.267 No.-
<P>Carbon nanotube (CNT) sheets can have several functionalities, acting as transparent electrodes and more interestingly, as alignment layer for liquid crystals (LCs). Their flexibility, and mechanical strength make them ideal for flexible electronic applications. For this use, one aspec bt that needs to be addressed is their implementation with polymer substrates. The realization of the C NT films is quite easy, but a good adhesion between CNTs and substrates is not trivial. Here we explore the use of various polymer substrates focusing on the adhesion of the nanotubes on top. By using ethanol we improve the adhesion forcing the nanotubes to lie completely on the surface. However, this is at the expense of a decrease in orientational order of CNTs, which is detrimental for using them as aligning layer for LC. Poly(methyl methacrylate) (PMMA) has the best performance among the tested polymers, but it still shows a decrease in orientational order after deposition. Nevertheless, the CNT-PMMA substrates were able to impose some homogenous alignment on the nematic LC (4-Cyano-4'-pentylbiphenyl, 5CB) proving that aligned CNT sheets are suitable for a variety of electro-optic applications with LCs. (C) 2018 Elsevier B.V. All rights reserved.</P>
Toxicity of graphene nanoflakes evaluated by cell-based electrochemical impedance biosensing.
Yoon, Ok Ja,Kim, Insu,Sohn, Il Yung,Kieu, Truong Thuy,Lee, Nae-Eung John Wiley Sons 2014 Journal of biomedical materials research. Part A Vol.102 No.7
<P>Graphene nanoflake toxicity was analyzed using cell-based electrochemical impedance biosensing with interdigitated indium tin oxide (ITO) electrodes installed in a custom-built mini-incubator positioned on an inverted optical microscope. Sensing with electrochemical measurements from interdigitated ITO electrodes was highly linear (R(2)?=?0.93 and 0.96 for anodic peak current (Ipa) and cathodic peak current (Ipc), respectively). Size-dependent analysis of Graphene nanoflake toxicity was carried out in a mini-incubator system with cultured HeLa cells treated with Graphene nanoflakes having an average size of 80 or 30 nm for one day. Biological assays of cell proliferation and viability complemented electrochemical impedance measurements. The increased toxicity of smaller Graphene nanoflakes (30 nm) as measured by electrochemical impedance sensing and optical monitoring of treated cells was consistent with the biological assay results. Cell-based electrochemical impedance biosensing can be used to assess the toxicity of nanomaterials with different biomedical and environmental applications.</P>