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Electron emission from arrays of carbon nanotubes/fibres
W. I. Milne,K. B. K. Teo,M. Chhowalla,G. A. J. Amaratunga,D. Pribat,P. Legagneux,G. Pirio,Vu Thien Binh,V. Semet 한국물리학회 2002 Current Applied Physics Vol.2 No.6
The overall aim of this work is to produce arrays of eld emitting microguns, based on carbon nanotubes, which can be utilised inthe manufacture of large area eld emitting displays, parallel e-beam lithography systems and electron sources for high frequency(MWCNTs) using a dc plasma technique and a Ni catalyst. We will discuss how the density of the carbon nanotube/bres can bevaried by reducing the deposition yield through nickel interaction with a diusion layer or by direct lithographic patterning of the Nicatalyst to precisely dene the position of each nanotube/bre. Details of the eld emission behaviour of the dierent arrays ofMWCNTS will also be presented.. 2002 Published by Elsevier Science B.V.
DIRECT GROWTH OF MULTI-WALLED CARBON NANOTUBES ON SHARP TIPS FOR ELECTRON MICROSCOPY
M. MANN,K. B. K. TEO,W. I. MILNE,T. TESSNER 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2006 NANO Vol.1 No.1
The favorable electron optical properties of carbon nanotubes (CNTs) have been studied in detail, but the application to electron sources has been limited by the complexity of the fabrication process. We report the use of Plasma Enhanced Chemical Vapor Deposition (PECVD) for the direct deposition of multi-walled CNTs onto the apex of sharply etched tungsten tips, aligned to the vertical axis of the tips. We show that these emitters have excellent stability.
Aligned carbon nanotubes/fibers for applications in vacuum microwave devices
W.I.Milne,K.B.K.Teo,G.A.J.Amaratunga,R.Lacerda,P.Legagneux,G.Pirio,V.Semet,V.Thien Binh 한국물리학회 2004 Current Applied Physics Vol.4 No.5
Carbon nanotubes exhibit extraordinary eld emission properties because of their high electrical conductivity, ideal high aspectratio whisker-like shape for geometrical eld enhancement, and remarkable thermal stability. This paper will describe the PECVDgrowth of vertically aligned arrays of carbon nanotubes which are suitable for use as the electron emitters in a novel type ofmicrowave amplier capable of producing of order 10 W at 30 GHz.
Mammalian Systems Biotechnology Reveals Global Cellular Adaptations in a Recombinant CHO Cell Line
Yusufi, F.N.K.,Lakshmanan, M.,Ho, Y.S.,Loo, B.L.W.,Ariyaratne, P.,Yang, Y.,Ng, S.K.,Tan, T.R.M.,Yeo, H.C.,Lim, H.L.,Ng, S.W.,Hiu, A.P.,Chow, C.P.,Wan, C.,Chen, S.,Teo, G.,Song, G.,Chin, J.X.,Ruan, X. Cell Press 2017 Cell systems Vol.4 No.5
Effective development of host cells for therapeutic protein production is hampered by the poor characterization of cellular transfection. Here, we employed a multi-omics-based systems biotechnology approach to elucidate the genotypic and phenotypic differences between a wild-type and recombinant antibody-producing Chinese hamster ovary (CHO) cell line. At the genomic level, we observed extensive rearrangements in specific targeted loci linked to transgene integration sites. Transcriptional re-wiring of DNA damage repair and cellular metabolism in the antibody producer, via changes in gene copy numbers, was also detected. Subsequent integration of transcriptomic data with a genome-scale metabolic model showed a substantial increase in energy metabolism in the antibody producer. Metabolomics, lipidomics, and glycomics analyses revealed an elevation in long-chain lipid species, potentially associated with protein transport and secretion requirements, and a surprising stability of N-glycosylation profiles between both cell lines. Overall, the proposed knowledge-based systems biotechnology framework can further accelerate mammalian cell-line engineering in a targeted manner.
SWCNT growth on Al/Fe/Mo investigated by <i>in situ</i> mass spectroscopy
Kim, S-M,Zhang, Y,Teo, K B K,Bell, M S,Gangloff, L,Wang, X,Milne, W I,Wu, J,Jiao, J,Lee, S-B IOP Pub 2007 Nanotechnology Vol.18 No.18
<P>The effect of temperature on the growth of single-walled carbon nanotubes (SWCNTs) was investigated over the range of 725–900 °C. A cold-wall reactor consisting of a heated stage (on which the substrate for SWCNT growth (Al/Fe/Mo) was placed) and a showerhead (from which C<SUB>2</SUB>H<SUB>2</SUB> was introduced vertically into the reactor) was used for the growth. The heating was found to play two roles: (1) it generated complex hydrocarbon radicals during the growth process, as well as (2) promoting catalytic nanoparticles on the substrate during the annealing process. The optimum temperature for the highest SWCNT yield was found to be ∼860 °C. For the first time, <I>in situ</I> mass spectroscopy was used to identify the growth precursors generated from thermal pyrolysis of C<SUB>2</SUB>H<SUB>2</SUB> within this temperature range. The peak of the radicals found (C<SUB>6</SUB>H<SUB>9</SUB>, C<SUB>5</SUB>H<SUB>9</SUB> and C<SUB>6</SUB>H<SUB>13</SUB>) and the highest catalyst support particle density (Fe catalyst supported on Al<SUB><I>x</I></SUB>O<SUB><I>y</I></SUB>) was correlated to the maximum yield of single walled carbon nanotubes at the optimum growth temperature of ∼860 °C. Bottom gate SWCNT-FETs (single-walled carbon nanotube based field effect transistors) were fabricated showing a high transconductance of ∼0.12 µS and on/off ratio of ∼10<SUP>5</SUP> which are both comparable to other state-of-the-art SWCNT-FET. </P>
Field emission properties of self-assembled silicon nanostructures formed by electron beam annealing
S. Johnson,A. Markwitz,M. Rudolphi,H. Baumann,S.P. Oei,K.B.K. Teo,W.I. Milne 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Arrays of silicon nanostructures on n- and p-type silicon (100) substrates were fabricated using electron beam annealing of untreated silicon at 1100 C. Following annealing for 15 s, the nanostructures exhibit an average height of 8 ± 1 nm and a surface density of 11 lm2, independent of the substrate conduction type. Following annealing for 600 s the individual nanostructures coalesce and the surface appears roughened with an rms roughness of 30 nm. The field emission properties of these nanostructure arrays have been assessed and electron emission through Fowler–Nordheim tunnelling was confirmed. The difference in threshold field for electron emission from the nanostructured and roughened substrates is related to the geometrical differences between the substrate surfaces. At large electric fields, space charge limited conduction dominates the field emission characteristics of the nanostructured surface.