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Controlling work function of reduced graphite oxide with Au-ion concentration
Benayad, Anass,Shin, Hyeon-Jin,Park, Hyeon Ki,Yoon, Seon-Mi,Kim, Ki Kang,Jin, Mei Hua,Jeong, Hae-Kyung,Lee, Jae Cheol,Choi, Jae-Young,Lee, Young Hee Elsevier 2009 Chemical physics letters Vol.475 No.1
<P><B>Graphical abstract</B></P><P>The spontaneous electrons transfer from the specific bands in RGOs to Au-ions and their reduction induced a downshift of the Fermi level and contributed to tailoring the work function of the RGOs films. The sheet resistance of those films was decreased by the increase of the hole concentration at the pristine RGOs’ surface as a result of the p-type doping.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>We have investigated the effect of Au-ion treatment on the work function and the electronic structure change of reduced graphite oxides (RGOs). Au-ions were reduced spontaneously by extracting electrons (i) from sp<SUP>2</SUP> carbons of RGO at low concentration and (ii) from some oxygen-related functional groups at high concentration. This implies that the work function was modulated by the amount of charges transferred to Au-ions. The sheet resistance of the RGO film was improved with Au-ion treatment. This was explained in terms of electron donation to Au-ions that eventually led to a p-type doping in RGO film.</P>
Electronic structure of (Ge2Sb2Te5)1−x(In3SbTe2)x investigated by x-ray photoelectron spectroscopy
Benayad, Anass,Kang, YounSeon,Shin, Hyun-Joon,Kim, Kihong,Suh, Dong-Seok,Kim, KiJoon,Kim, CheolKyu,Lee, Tae-Yon,Noh, Jin-Seo,Lee, JaeCheol,Khang, YoonHo American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.106 No.4
Unconventional resources in Algeria: appraisal result from the Hamra Quartzite reservoir
Soumya Benayad,박영수,Rabah Chaouchi,Naima Kherfi 한국지질과학협의회 2013 Geosciences Journal Vol.17 No.3
Unconventional resources have been widely discovered within the Ordovician rocks (Hamra Quartzite reservoir) of a number of basins in Algeria, including the giant Hassi Messaoud oil-field. This study aims to provide an appraisal of the major characteristics of the Hamra Quartzite reservoir within the southern peripheral area of the Hassi Messaoud field. Petrographically, quartz grains in this reservoir are considered to be mature quartz arenites characterized by pervasive quartz overgrowth. Reservoir porosity is dominated by secondary intergranular dissolution porosity. The diagenetic sequence of the Hamra Quartzite reservoir occurred in three phases: eodiagenesis (early), mesodiagenesis (mid), and telodiagenesis (late) phases. These phases are directly related to tectonic events that affected the study area, and are controlled mainly by the Hercynian unconformity. The Hamra Quartzite reservoir was highly silicified during the pre-Hercynian phase. Compaction and cementation are the principal factors controlling reservoir degradation. The reservoir is faulted and fractured, and fractures ranging from partially open to closed are observed in cores. Petrophysically, the reservoir displays low porosity and permeability values. However, moderately porous and permeable sandstone is present toward the southeastern part of the studied reservoir.
Hydrocarbons Law and Bidding Opportunities in Algeria
박영수,Soumya Benayad 한국자원공학회 2013 한국자원공학회지 Vol.50 No.5
Algeria is heavily reliant on its hydrocarbon sector, which accounts for 70% of its government budget revenues. However, in recent years, crude oil production has been stagnant and natural gas production has gradually declined on account of consistent delays in new production and infrastructure projects. In addition, in the last licensing rounds, there has been limited interest from foreign investors to undertake new oil and gas projects under the government’s current terms such as stringent financial terms and windfall taxes. On the other hand, petroleum experts have related this limited interest to the lack of hydrocarbon potential of the blocks offered, rather than unattractive fiscal terms. In February 2013, the Algerian parliament amended the country’s hydrocarbon law and introduced fiscal incentives to entice foreign companies to undertake new ventures, particularly in the exploration of unconventional resources, both onshore and offshore.
Bulliard, Xavier,Benayad, Anass,Lee, Kwang-Hee,Choi, Yun-Hyuk,Lee, Jae Cheol,Park, Jong-Jin,Kim, Jong-Min IOP Pub 2011 Nanotechnology Vol.22 No.47
<P>We report on a method for surface nano-texturing on a plastic substrate. Nano-objects with a silica nanoparticle core and a textured cobalt oxide crown are created with selectable density on the plastic substrate. The resulting dual morphology is easily tuned over large areas, either by changing the parameters directing nanoparticle deposition through electrostatic self-arrangement for nano-object density control, or the parameter directing cobalt oxide deposition for shape control. The entire process takes place at room temperature, with no chemicals harmful to the plastic substrate. The ready modulation of the dual morphology is used to control the wettability properties of the plastic film, which is covered by nano-objects. </P>
New dry carbon nanotube coating of over-lithiated layered oxide cathode for lithium ion batteries
Mun, Junyoung,Park, Jin-Hwan,Choi, Wonchang,Benayad, Anass,Park, Jun-Ho,Lee, Jae-Myung,Doo, Seok-Gwang,Oh, Seung M. The Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.46
<▼1><P>For high rate capability and energy density of lithium ion batteries, over-lithiated layered cathodes coated by multiwall carbon nanotube were prepared by a novel dry method without decay in the structure.</P></▼1><▼2><P>Carbon serves as one of the best coating materials for the cathode in lithium ion batteries. This is because it can solve two main problems, which are surface deterioration and poor electrical conductivity. However, the conventional carbon coating procedures and, chemical carbonization processes, are especially difficult to implement for the oxide cathode, which could thereby deteriorate the oxide structure. We prepared a new dry 100 nm-thick homogeneous multi-walled carbon nanotube (MWCNT) coating on the high-capacity oxide cathode material, Li1.17Ni0.17Co0.1Mn0.56O2, by applying shear stress without breaking down the crystal structure or morphology of the cathode. The electronic conductivity of the carbon composite with the coated sample is 170 mS cm<SUP>−1</SUP>, which is over 40 times as much as the conductivity of the pristine cathode containing the same amount of carbon. In addition, at a high current condition of 2450 mA g<SUP>−1</SUP>, a specific capacity of 103 mA h g<SUP>−1</SUP> is observed even with 3 percent of the carbon (in weight) constituting the coated MWCNT. The unconventionally improved performances are explained by the suppression of the electronic resistance and surface charge transfer resistance by electrochemical analyses.</P></▼2>