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Size-dependent Field-emission Properties from Triangular-shaped GaN Nanostructures
Duc V. Dinh,J. H. Yang,S. M. Kang,S. W. Kim,윤대호 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
Gallium nitride (GaN) nanostructures were synthesized on Si substrates by using the vapor-phase epitaxy (VPE) method. The as-synthesized GaN nanostructures with a hexagonal, single-crystalline structure possessed a triangular cross-section with nanorod and nanowire diameters ranging from about 100 to 280 nm and from about 20 to 60 nm, respectively. The field-emission (FE) properties of the GaN nanostructures were investigated in terms of their size dependence. Turn-on fields of about 4.85 V/ and 4.10 V/, respectively, for the GaN nanorods and nanowires were obtained, corresponding to field-enhancement factors of about 373 and 1427. The higher aspect ratio of the GaN nanowires compared to that of the GaN nanorods caused the differences in FE properties.
Projection algorithms for solving nonmonotone equilibrium problems in Hilbert space
Dinh, B.V.,Kim, D.S. Koninklijke Vlaamse Ingenieursvereniging ; Elsevie 2016 Journal of computational and applied mathematics Vol.302 No.-
<P>We propose two projection algorithms for solving an equilibrium problem where the bifunction is not required to be satisfied any monotone property. Under assumptions on the continuity, convexity of the bifunction and the nonemptyness of the solution set of the Minty equilibrium problem, we show that the sequences generated by the proposed algorithms converge weakly and strongly to a solution of the primal equilibrium problem respectively. (C) 2016 Elsevier B.V. All rights reserved.</P>
Dinh, T.V.,Choi, I.Y.,Son, Y.S.,Kim, J.C. Elsevier Sequoia 2016 Sensors and actuators. B Chemical Vol.231 No.-
Non-dispersive infrared (NDIR) gas sensors applied in an environmental field are considered. Disadvantages of the non-dispersive infrared (NDIR) gas sensors include spectral interference and high detection limit. Efforts to improve these disadvantages are reviewed in this paper. Interference caused by water vapor and gas matrix has been partially solved using optical filters and interference correction factors. Limitations such as accuracy and sensitivity of the sensor were overcome by the improvements of inlet gas concentrations, infrared sources, optical designs (including optical filter and gas chamber) and detectors. These improvements are limited to a few gases, in particular, carbon dioxide. Drawbacks related to water vapor still remain and need to be addressed.
Oxidize Graphene by UV-Ozone Treatment in Vacuum Chamber
Dinh, S. Thach,Pham, T. H. Nhung,Nguyen, T. T. Hien,Dinh, N. T. Nghia,Vu, V. Quang,Hoang, T. K. Dung,Duong, D. Loc American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.8
<P>As changing graphene properties is vital to promote it as electronic device, we developed graphene modified method with epoxy group by two simple methods: ultraviolet irradiation with various partial oxygen pressures and ultraviolet irradiation under rich oxygen condition with various temperatures. By Hall measurement, the electric mobility in graphene was decreased with increasing temperature during UV-ozone treatment at 50 degrees C, 80 degrees C, 100 degrees C and 120 degrees C. At low partial oxygen pressure (less than 160 Torr) the oxidation degree is not significant. Additionally, Raman spectroscopy showed the disrupted pi-pi structure in graphene. Based on the above identification we supposed that epoxy group might establish on graphene surface.</P>