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23 Jul 2012

Volume 101, Issue 4, Articles (04xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 101, 043101 (2012); http://dx.doi.org/10.1063/1.4737152 (4 pages)

Toshiaki Tanigaki, Yoshikatsu Inada, Shinji Aizawa, Takahiro Suzuki, Hyun Soon Park, Tsuyoshi Matsuda, Akira Taniyama, Daisuke Shindo, and Akira Tonomura
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Towards secondary ion mass spectrometry on the helium ion microscope: An experimental and simulation based feasibility study with He+ and Ne+ bombardment

T. Wirtz, N. Vanhove, L. Pillatsch, D. Dowsett, S. Sijbrandij, and J. Notte

Appl. Phys. Lett. 101, 041601 (2012); http://dx.doi.org/10.1063/1.4739240 (5 pages) | Cited 1 time

Online Publication Date: 25 July 2012

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The combination of the high-brightness He+/Ne+ atomic level ion source with secondary ion mass spectrometry detection capabilities opens up the prospect of obtaining chemical information with high lateral resolution and high sensitivity on the Zeiss ORION helium ion microscope. The analytical performance in terms of sputtering yield, useful yield, and detection limit is studied and subsequently optimized by oxygen and cesium flooding. Detection limits down to 10−6 and 10−5 can be obtained for silicon using Ne+ and He+, respectively. A simulation based study reveals furthermore that a lateral resolution <10 nm can be obtained.
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07.78.+s Electron, positron, and ion microscopes; electron diffractometers
07.75.+h Mass spectrometers

Surface modification by nonthermal plasma induced by using magnetic-field-assisted gliding arc discharge

Zongbao Feng, Noboru Saeki, Tomoyuki Kuroki, Mitsuru Tahara, and Masaaki Okubo

Appl. Phys. Lett. 101, 041602 (2012); http://dx.doi.org/10.1063/1.4738766 (4 pages)

Online Publication Date: 26 July 2012

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The authors report on the introduction of a magnetic field to gliding arc discharge (GD) in order to enhance surface modification by nonthermal plasma at atmospheric-pressure. The GD is induced between two wire electrodes by using a pulse high-voltage power supply with peak-to-peak voltage of 5 kV. When a magnetic field of 0.25 T is applied, the GD enlarged and a 19-cm-long stretch of plasma is excited. The surface treatment of polyethylene terephthalate and polytetrafluoroethylene films is performed. The adhesion improved by up to ∼30 times due to the enhanced chemical activity in the films.
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81.65.-b Surface treatments
52.77.-j Plasma applications
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
68.35.Np Adhesion

Activation mechanism of carbon monoxide on α-Fe2O3 (0001) surface studied by using first principle calculations

Jianping Xiao and Thomas Frauenheim

Appl. Phys. Lett. 101, 041603 (2012); http://dx.doi.org/10.1063/1.4739935 (3 pages)

Online Publication Date: 27 July 2012

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We have employed first principle methods to investigate carbon monoxide (CO) adsorption on oxygen terminated α-Fe2O3 (0001) surface. We have found that the CO can be adsorbed and oxidized as long as the CO surface coverage reaches up to two thirds monolayer. Simultaneously, the bent CO2 are activated and dimerized. Furthermore, oxygen vacancy can dissociate water and produce carboxylic group by means of reactions with the activated CO2 dimer. Our calculations have reproduced experimental in situ observations of nanocrystalline α-Fe2O3. In this letter, we also propose a significant strategy to improve reactivity of α-Fe2O3 (0001) continuous film, to convert more efficiently CO into organic species.
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68.43.Mn Adsorption kinetics
61.72.jd Vacancies

Cathode-like luminescence from vacuum-dielectric interface induced by self-stabilizing secondary electron emission

Jiang-Yang Zhan (詹江杨), Hai-Bao Mu (穆海宝), Guan-Jun Zhang (张冠军), Xue-Zeng Huang (黄学增), Xian-Jun Shao (邵先军), and Jun-Bo Deng (邓军波)

Appl. Phys. Lett. 101, 041604 (2012); http://dx.doi.org/10.1063/1.4738999 (4 pages) | Cited 1 time

Online Publication Date: 27 July 2012

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A kind of interesting luminescence phenomenon from vacuum-dielectric interface under high electric field is presented in this Letter. It is visible, steady, and continuous, occurring before or accompanied with flashover across dielectric, which is quite different from general electroluminescence from insulator surface reported before. By investigating its optical and electrical characteristics, we consider it as cathode-like luminescence, which is initialized by the field electron emission from cathode triple junction and finally generated by the process of radiative recombination due to the self-stabilizing secondary electron emission and collision on insulator surface.
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78.60.Hk Cathodoluminescence, ionoluminescence
79.20.Hx Electron impact: secondary emission
79.70.+q Field emission, ionization, evaporation, and desorption

Precise control of epitaxy of graphene by microfabricating SiC substrate

H. Fukidome, Y. Kawai, F. Fromm, M. Kotsugi, H. Handa, T. Ide, T. Ohkouchi, H. Miyashita, Y. Enta, T. Kinoshita, Th. Seyller, and M. Suemitsu

Appl. Phys. Lett. 101, 041605 (2012); http://dx.doi.org/10.1063/1.4740271 (4 pages)

Online Publication Date: 27 July 2012

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Epitaxial graphene (EG) on SiC is promising owing to a capability to produce high-quality film on a wafer scale. One of the remaining issues is microscopic thickness variation of EG near surface steps, which induces variations in its electronic properties and device characteristics. We demonstrate here that the variations of layer thickness and electronic properties are minimized by using microfabricated SiC substrates which spatially confines the epitaxy. This technique will contribute to the realization of highly reliable graphene devices.
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81.05.ue Graphene
81.05.Hd Other semiconductors
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy
73.22.Pr Electronic structure of graphene
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