Low Leakage Current by Solution Processed PTAA‑ZnO Transparent Hybrid Hetero‑Junction Device

Bablu K. Ghosh,Abdul I. A. Rani,Khairul A. Mohamad,Ismail Saad 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.5

In this work solution processed novel poly-triarylamine (PTAA) organic p-type active layer on inorganic n-ZnO devicetransparency and electrical properties are investigated under illumination. Low cost organic–inorganic transparent hybridhetero-junction (HHJ) is a promising candidate for next-generation photovoltaic applications. Greater band gap organicmaterial window layer while inorganic material’s higher thermal stability as HHJ is suitable for detection and photovoltaicapplications. However, hetero-interface defects associated leakage current is the key issue of undermining large-area deviceelectrical performance. Hetero-interface defect associated carriers optical absorption limits transparency whereas leakagecurrent density is reliant on physical property and band barrier effect. It is demanded to investigate hetero-device physicalstuff and band barrier effect on electrical properties. Novel PTAA is deposited on RF-sputtered inorganic n-ZnO/ITO/glasssubstrate by spin-coating method. 100 and 60 nm PTAA thin films are deposited with 1000 and 2000 revolution per minute(rpm) growth sequence, respectively. PTAA as a transparent p-emitter is shown to absorb incident light beyond visible band,thereby it has promoted excitonic effect. Device I–V characterization carried out at different annealing temperatures andapplied voltage. Suitable annealing condition leakage current is shown to reduce nearly 10−4 A/cm2 and at higher appliedfield the greater rectifying I(+)/I(−) ratio is realized. Grain size is shown to increase with annealing effect however; leakagecurrent is remained almost independent of grain size.

Design and Implementation of a New Electronic Technique for Real-Time Correction of Parallax/Lag and Air-condition Noises in Airborne Magnetic Data

K.G. Abdel-Kader,A.A.M. Ismail,F.A.S. Soliman,A.S.S. El-Kabbani,A.Yahya,A.M. Abdel-Maksood 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.12

Recent developments in airborne magnetic detection systems have made it possible to detect much small magnetic objects such as unexploded ordnance. However, the data sets are extremely large and the measurements must be processed and interpreted. Therefore, there is an increasing need for a fully automatic processing and interpretation techniques that can be used to make decisions regarding the nature of the source in real time. So, the aim of the present paper is to shed further light on the real time correction of parallax/Lag -and air-condition-noises in airborne magnetic data acquisition. A novel electronic technique, based on micro-controllers design and implementation, was designated for real-time processing applications. The proposed technique shows excellent airborne magnetic data results considering actual field examples. The proposed technique verifies an accurate and objective tool for magnetic objects detection compared with the existing PEI tools considering cost and processing automation capabilities.

New issue of GaN nanoparticles solar cell

M.A. Qaeed,K. Ibrahim,K.M.A. Saron,M.S. Mukhlif,A. Ismail,Nezar G. Elfadill,Khaled M. Chahrour,Q.N. Abdullah,K.S.A. Aldroobi 한국물리학회 2015 Current Applied Physics Vol.15 No.4

This study involves the synthesis of gallium nitride (GaN) nanoparticles (NPs) under different low temperatures using a simple chemical method. The nanoparticles are spin coated on Si substrate to fabricate the solar cell. The FESEM images obtained indicate the presence of cubic GaN nanoparticle with average diameter of 50 nm synthesized at 90 ℃. The spin coating technique deposited n-GaN NPs/Si(111) produced a heterojunction solar cell with fill factor of 0.56 and conversion efficiency of 2.06%. Based on these results, this study proposes a novel low cost technique for the fabrication of GaN NPs solar cells.

OFF-SET CRACK PROPAGATION ANALYSIS UNDER MIXED MODE LOADINGS

A. E. ISMAIL,A. K. ARIFFIN,S. ABDULLAH,M. J. GHAZALI 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.2

An assessment was carried out herein to study the eccentricity of cracks subjected to mixed-mode loadings. Several loading locations relative to a central line were selected to induce mixed-mode loadings, which were computed using a finite element method. An adaptive meshing technique was adopted during the simulation of crack propagation to ensure the singularity of stress at the tip of the crack. The stress intensity failure criterion was used and programmed, and the node splitting technique was used when the stress intensity factor reached the fracture toughness of the material to simulate crack propagations. It was found that large variations in the stress intensity factor were observed when off-set cracks were used, and that KII decreased when loading distance increased, but increased when the off-set crack distance was increased. Both crack eccentricity and loading distance played important roles in producing mixed-mode loading, compared to the influence of central cracks. Correction factors were introduced to modify the calculation of stress intensity factors under mixed-mode loadings. Simulations of crack propagation were also conducted to study the effects of crack eccentricities and loading distances. It was found that the crack length, the loading distance relative to the central crack and the crack eccentricity dominated calculations of the integrity of cracked structures.

DJ-1 upregulates breast cancer cell invasion by repressing KLF17 expression

Ismail, I A,Kang, H S,Lee, H-J,Kim, J-K,Hong, S-H Nature Publishing Group 2014 The British journal of cancer Vol.110 No.5

<P><B>Background:</B></P><P>DJ-1 (PARK7) was reported as an oncogene in a Ras-dependent manner. Recent studies have shown that DJ-1 stimulates cell proliferation, cell invasion, and cancer metastasis. However, the molecular mehchanism by which DJ-1 induces cancer cell invasion and metastasis remains unclear.</P><P><B>Methods:</B></P><P>Breast cancer cells were transfected with DJ-1 siRNA or DJ-1 overexpression to investigate the effect of DJ-1 on KLF17 expression. ID-1 luciferase promoter assay was performed to evaluate DJ-1-dependent KLF17 expression changes. In addition, Epistasis analysis of DJ-1 and KLF17 was performed to evaluate their regulatory interactions. Ras inhibitors were pretreated to determine whether DJ-1 regulates cell invasion in a Ras-dependent manner.</P><P><B>Results:</B></P><P>In the present study, we found increased DJ-1 expression in highly invasive breast cancer cells as compared with non-metastatic cells. Furthermore, DJ-1 promoted breast cancer cell invasion by downregulating E-cadherin and increasing Snail expression. Interestingly, exogenous DJ-1 overexpression markedly decreased mRNA and protein expression of KLF17, the EMT negative regulator. These data were confirmed by ID-1 promoter activity, which is directly regulated by DJ-1-dependent KLF17 transcription factor. Epistasis analysis showed that KLF17 overexpression overcomes increased cell invasion by DJ-1, suggesting that KLF17 might be one of the downstream signalling molecules of DJ-1. Acceleration of cell invasion by DJ-1 was alleviated by Ras inhibitors, suggesting that DJ-1 cooperates with Ras to increase cell invasion.</P><P><B>Conclusion:</B></P><P>Altogether, these data suggest for the first time that DJ-1 acts as an EMT-positive regulator in breast cancer cells via regulation of the KLF17/ID-1 pathway.</P>

EFFECT OF VARIABLE MASS INJECTION ON THE FLOW IN A POROUS CAVITY

K. A. R. Ismail,M. A. Zanardi 대한기계학회 1992 International Conference on Fluid Machinery Vol.1 No.1

Performance of Concrete Containing Laterite Aggregates

K. Muthusamy,N. W. Kamaruzaman,Mohamed A. Ismail,A. M. A. Budiea 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.7

In Malaysia, concerns about the depletion of granite aggregates in the future and the availability of laterite aggregates locally have incentivized researchers to integrate laterite aggregate into the production of concrete. Studies found that the use of 20 to 30% of laterite aggregates, as partial replacement for coarse aggregates, results in concrete with the targeted strength. However, the effect of laterite aggregate content on the durability performance of this concrete is unknown. As such, the acid resistance and water absorption of concrete consisting of various percentages of laterite aggregates, integrated as partial replacement of coarse aggregates, are presented and discussed. Mixes consisting of varying amounts (0-50%) of laterite aggregates were prepared in the form of cubes (150 × 150 × 150 mm). After water curing for 28 days, the specimens were tested for the determination of compressive strength and durability against acid attack and water absorption. It was found that concrete with low water absorption can be produced through the integration of 50% of laterite aggregates. Similarly, the integration of laterite aggregates of up to 20% produces concrete that exhibits good durability against acid attack, chloride ion penetration, and water absorption.

Effect of annealing treatment on the uniformity of CeO2/TiO2 bilayer resistive switching memory devices

M. Ismail,A.M. Rana,S.-U. Nisa,F. Hussain,M. Imran,K. Mahmood,I. Talib,E. Ahmed,D.H. Bao 한국물리학회 2017 Current Applied Physics Vol.17 No.10

Bilayer CeO2/TiO2 films with high-k dielectric property were prepared by rf magnetron sputtering technique at room temperature. Effect of annealing treatment on resistive switching (RS) properties of bilayer CeO2/TiO2 films in O2 ambient at different temperature in the range of 350e550 C was investigated. Our results revealed that the bilayer films had good interfacial property at 500 C and this annealing temperature is optimum for different RS characteristics. Results showed that bilayer CeO2/TiO2 film perform better uniformity and reliability in resistive switching at intermediate temperature (i.e. 450 C and 500 C) instead of low and high annealing temperature (i.e. 350 C and 550 C) at which it exhibits poor crystalline structure with more amorphous background. Less Gibbs free energy of TiO2 as compared to CeO2 results in an easier re-oxidation of the filament through the oxygen exchange with TaN electrode. However, the excellent endurance property (>2500 cycles), data retentions (105 s) and good cycle-to-cycle uniformity is observed only in 500 C annealed devices. The plots of cumulative probability, essential memory parameter, show a good distribution of Set/Reset voltage.

Evaluation of cellulose acetate membrane with carbon nanotubes additives

L.A. Nezam El-Din,A. El-Gendi,N. Ismail,K.A. Abed,Awd I. Ahmed 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-

Cellulose acetate (CA)/carbon nano tubes (CNT) membranes were prepared using phase inversion method by dispersing different ratio of carbon nano-materials in CA casting solution. Different polymer to solvent ratios examined for enhancement of membrane desalination. The influence of differentiation in CA and CNT ratio on the morphology and thermal stability were investigated using scanning electron microscopy and thermogravimetric analysis (TGA). Also, Permeation performance of the prepared membranes was evaluated. Morphology results showed that CA membrane porosity decreased with increasing polymer ratio. The membranes pure water flux was increased by the addition of nano-carbon materials. The optimum polymer to solvent ratio for accepted desalination performance was 25:75. The presence of carbon nanotubes (CNT) in the optimum membrane enhanced the salt rejection markedly to 96% as well as the pure water flux has been improved. The optimum membrane in the presence of CNT has convenient thermal stability with accepted water content percent and swelling percent.

Bezoin in Heterocyle Synthesis: Synthesis and Reactions of 2, 3-Diphenyl-4-cyanopyrrole-5-thione

Khalifa, Fathy A.,Zohdi, Hussein F.,Ibrahim, M.K.A.,Ismail, N.A. The Pharmaceutical Society of Korea 1990 Archives of Pharmacal Research Vol.13 No.4

2, 3-diphenyl-4-cyano-pyrrole-5-thione (4) was either by the reaction of benzoin (1) and cyanothioacetamide (3) followed by cyclization using AcOH/sodium acetate or by refluxing a mixture of benzoin (1) and cyanothioacethamide in pyridine to afford directly 4. Several new pyrrole and pyrazole derivatives were synthesised using 4 as synthon. The structure of the newly synthesised derivatives were based on celemental and spectral data studies. Methylation of the SH group in 4 afforded 5. Reaction of 4 with ethyl bromo acetate afforded (6). Treatment of (5) and (6) with hydrazine hydrate afforded the same pyrazole derivative (10) through the intermediate (9). Treatment of 6 with aniline and phenylhydrazine afforded the pyrrole derivatives 8a, b respectively. Treatment of 6 while dill HCI gave 2, 3-diphenyl-4-cyano-pyrrole-5-one (7). Treatment of 6 with $NH_3$/EtOH afforded the amidic derivatives (11) with treatment of 6 $NH_3$/ heat then acidification it gave the carboxylic derivatives (12).