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Muhammad Naeem Awais,Muhammad Naeem Shehzad 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.5
The prediction of the current-voltage (IV) characteristics of resistive switching devices has remained a challenge before their physical realization. This research work addresses the prediction of the IV characteristics and the bipolar switching mechanism of polymer-based resistive switches by examining their structures before their fabrication. The research was carried out through an analytical study of the device structure, thereby correlating the predicted IV curve to the \textit{in-situ} IV characteristics of the device. Different types of the device structures were considered, depending upon the work function of the top and the bottom electrodes and the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) levels of the sandwiched layer. We concluded that the defects/traps within the sandwiched layer lead to the interface effect being the dominant switching mechanism driving the polymer-based resistive switches. Furthermore, we also found that the devices following the interface effect are driven from trap-limited space-charge-limited current (SCLC) conduction to trap-free SCLC conduction as their current conduction mechanisms.
Patterning of Ag Electrode for the Printed Memristor through Electrohydrodynamic Printing Technique
Muhammad Naeem Awais,Yang Hui Doh,Dong Soo Kim,Kyung Hyun Choi 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Memristor has evolved as a potential contender for nonvolatile memory applications in recent years. Nevertheless, memristive systems have proved as a prospective candidate in neural networks, logic and computational processes. The electrical switching behavior is induced by engineering the device with two different barriers: schottky barrier and ohmic barrier. This mechanism can be accomplished by placing the switching material between two metals so forming Metal?Insulator?Metal (MIM) structure and induce an electroforming process by applying voltage at both the metal electrodes of MIM structure. In this brief the deposition of metal electrode for the printed memristor through Electrohydrodynamic Printing (EHDP) technique has been demonstrated. The results reveal the successful patterning of Ag metal electrode for the missing fourth circuit element, memristor. The conductivity of the Ag deposited layer through EHDP technology for the newly born has been demonstrated.
Muhammad Naeem Awais,최경현 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.3
The paper reported the fabrication of full organic resistive switch (FORS) with the sandwich structure of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)/poly(4-vinylphenol)(PVP)/poly(3,4- ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS). The fabricated FORS elucidated reversible bipolar resistive switching behavior at higher operational voltage between −20 V and +30 V. The switching mechanism in the FORS device was attributed to the hole injection through PEDOT:PSS electrode and filling of trap sites in the PVP sandwiched layer by the limited injection. Current conduction mechanisms were concluded and supported by the charge transport governing physical laws. The dominant current conduction mechanism in the fabricated FORS was attributed to the transition from trap-limited space charge limited current (SCLC) conduction to trap-free SCLC conduction mechanism. The robustness of the fabricated FORS was tested over 100 multiple voltage sweeps.
최경현,Muhammad Naeem Awais 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.1
This brief demonstrates the promising feasibility of electrohydrodynamic (EHD) printing technology for the fabrication of a crossbar resistive switch (memristor) through the patterning of ITO as a bottom electrode and Ag as a top electrode. An ITO/ZrO2/Ag sandwich exhibiting reversible resistive switching (memristive) behavior has been demonstrated on a glass substrate. A physically layer-wise, electrical current-voltage (IV) characterization was done for the device fabricated using EHD printing. The device dimensions achieved in the current research were around 100 µm × 100 µm. The as-fabricated device showed a high ON/OFF ratio greater than 100000:1 with multiple operational voltages less than ±10 V. The measured retention time of the fabricated device was over 3 days. Results reveal that the current research work provides for the fabrication of a relatively low-cost memristive device with reversible resistive switching properties.
Shah, Muhammad Fahd,Naeem, Awais,Haq, Ihtisham ul,Riaz, Shehryar,Shakeel, Osama,Panteleimonitis, Sofoklis,Khattak, Shahid,Syed, Aamir Ali,Parvaiz, Amjad 대한대장항문학회 2022 Annals of Coloproctolgy Vol.38 No.3
Purpose: Laparoscopic approach to colonic tumor requires skill set and resources to be established as routine standard of care in most centers around the world. It presents particular challenge in country like Pakistan due to economic constrain and lack of teaching and training opportunities available for surgeons to be trained to deliver such service. The aim of this study is to look into changing practice of our institution from conventional approach of open to laparoscopic surgery for right colon cancer. Methods: Consecutive patients between January 2010 to December 2018 who presented to Shaukat Khanum Memorial Cancer Hospital and Research Centre with diagnosis of right colon (cecum, ascending and transverse colon) adenocarcinoma and underwent surgical resections were included in this study. Results: A total of 230 patients with adenocarcinoma of the right colon underwent curative resections during the study period. Of these, 141 patients (61.3%) underwent laparoscopic surgery while open resection was performed in 89 patients (38.7%). Five-year disease-free survival (DFS) of patients with American Joint Committee on Cancer (AJCC) stage III (80.9% vs. 54.8%, P=0.021) was significantly better if these patients underwent laparoscopic surgery while a trend toward better DFS (96.7% vs. 84.1%, P=0.111) was also observed in AJCC stage II patients, although this difference was not significant. Conclusion: This study demonstrates the adoption of a laparoscopic approach for right colon cancer over 10 years. With a standardized approach and using the principle of oncological surgery, we incorporated this in our minimally invasive surgery practice at our institution.
Maria Mustafa,Muhammad Naeem Awais,Ganeshthangaraj Pooniah,최경현,고정범,도양회 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.3
A novel route to thin-film fabrication of graphene oxide (GO) is presented using a well- known technique, <i>i.e.</i>, electrospray deposition. For deposition of the graphene-oxide thin film, grapheneoxide ink containing 0.025 wt% graphene oxide flowing through a metal capillary was subjected to a static electric field in order to generate atomized droplets, thereby depositing a uniform thin film of graphene oxide on an indium-tin-oxide coated polyethylene terephthalate substrate. The quality of the layer was characterized by analyzing the surface morphology and the thickness, and the electrical measurements on the single film were performed. In order to study the resistive switching behavior of GO, a prototype GO-based resistive switching device having an active area of 0.026 mm<sup>2</sup> was developed and was analyzed by current voltage measurements. The IV characteristics of the device successfully showed a typical non- volatile resistive switching behavior for a GO layer having the retention times of 103 s, thus highlighting the electrospray deposition technology as a reliable candidate for the fabrication of GO layers.
The Effect of Sc Promoter on the Performance of Co/TiO2–P25 Catalyst in Dry Reforming of Methane
Ahmed Sadeq Al-Fatesh,Muhammad Awais Naeem,Anis Hamza Fakeeha,Ahmed Elhag Abasaeed 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.8
In the present work, the effect of scandium (Sc) promoter on the performance of Co/TiO2–P25 catalyst in dry reforming of methane has been investigated. The catalysts were prepared by the incipient wet impregnation technique. For each catalyst, the Co loading was fixed at 5 wt %, while the Sc loading was varied from 0.0 to 2.0 wt %. The experiments were carried out at atmospheric pressure in a micro tubular reactor at a temperature of 700 °C. For better understanding and comparison, the catalysts were characterized by various techniques such as Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), H2-temperature-programmed reduction (TPR), CO2-temperature-programmed desorption (TPD), and thermogravimetric analyses (TGA). The results revealed that the promotion of Co/TiO2–P25 catalyst with Sc has a significant impact on its catalytic performance and the amount of carbon deposition. The doping of Co/TiO2–P25 catalyst with Sc improves the basicity and enhances the metal support interaction in the catalyst. At higher Sc loading, Co metal oxidation became substantial that triggered severe catalyst deactivation. Amongst all Sc-promoted catalysts, 0.75 wt % Sc-promoted catalyst exhibited the highest CH4 and CO2 activity with minimum deactivation.
Syngas production via CO2 reforming of methane using Co-Sr-Al catalyst
Anis Hamza Fakeeha,Ahmed Sadeq Al-Fatesh,Muhammad Awais Naeem,Wasim Ullah Khan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
The effect of addition of strontium in Co based catalysts during CO2 reforming of methane wasinvestigated in the temperature range 500–700℃. The Co/γ-Al2O3 supported catalysts with strontiumas a promoter (0–2.25 wt%) were prepared by incipient wet impregnation method. Numeroustechniques such as N2 adsorption–desorption isotherm, H2 temperature-programmed reduction (TPR),temperature-programmed desorption (TPD), X-ray diffraction (XRD), thermogravimetric analysis (TGA),Transmission Electron Microscopy (TEM), pulse chemisorption and temperature-programmed oxidation(TPO) were applied for characterization of fresh and spent catalysts. The results of characterizations andcatalyst activity test revealed that introduction of Sr in Co/γ-Al2O3 catalyst had significant effect onstability and coke suppression. The Sr addition improves the metal–support interaction as well asenhances the Lewis basicity of the catalyst. The improvement in basicity helps the chemisorption anddissociation of CO2 over the catalyst which in turn reduces carbon deposition.