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Rational hybrid modulation of P, N dual-doped holey graphene for high-performance supercapacitors
Nazarian-Samani, Masoud,Haghighat-Shishavan, Safa,Nazarian-Samani, Mahboobeh,Kim, Myeong-Seong,Cho, Byung-Won,Oh, Si-Hyoung,Kashani-Bozorg, Seyed Farshid,Kim, Kwang-Bum Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>A P, N dual-doped holey graphene (PNHG) material is prepared by a scalable, facile synthetic approach, using a mixture of glucose, dicyandiamide (DCDA), and phosphoric acid (H<SUB>3</SUB>PO<SUB>4</SUB>). H<SUB>3</SUB>PO<SUB>4</SUB> successfully functions as an “acid catalyst” to encourage the uniform breakage of C=C bonds to create large, localized perforations over the graphene monolith. Further acid treatment and annealing introduce in-plane holes. The correlation between the capacitance of the PNHG and its structural parameters during the fabrication process is comprehensively evaluated. A thermally induced sp<SUP>2</SUP>→sp<SUP>3</SUP> transformation occurs at high temperatures because of the substantial loss of graphitic sp<SUP>2</SUP>-type carbons, together with a dramatic reduction in capacitance. The target PNHG-400 electrode material delivers exceptionally high gravimetric capacitance (235.5 F g<SUP>−1</SUP> at 0.5 A g<SUP>−1</SUP>), remarkable rate capability (84.8% at 70 A g<SUP>−1</SUP>), superior capacitance retention (93.2 and 92.7% at 10 and 50 A g<SUP>−1</SUP> over 25000 cycles, respectively), and acceptable volumetric capacitance due to moderate density, when it is used with organic electrolytes in the voltage range between 0 and 3 V. These results suggest a pioneering defect-engineered strategy to fabricate dual-doped holey graphene with valuable structural properties for high-performance electric double layer supercapacitors, which could be used in next-generation energy storage applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Rationally designed P, N dual-doped holey graphene as an electrode in supercapacitors. </LI> <LI> Importance of synergistic ion transport with a high content of C=C bonds. </LI> <LI> Occurrence of sp<SUP>2</SUP>→sp<SUP>3</SUP> transition in graphene structure at temperatures higher than 400 °C. </LI> <LI> High capacitance, excellent rate capability and cyclic stability of the target PNHG-400. </LI> <LI> Novel approach to develop future supercapacitors with high energy and power densities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Fabrication of well-designed defect-laden holey graphene counterparts for energy-related applications using a simple, up-scalable and cost-effective strategy.</P> <P>[DISPLAY OMISSION]</P>
A Workplace to Support Creativity
Samani, Sanaz Ahmadpoor,Rasid, Siti Zaleha Binti Abdul,bt Sofian, Saudah Korean Institute of Industrial Engineers 2014 Industrial Engineeering & Management Systems Vol.13 No.4
The purpose of this paper is to provide a review of the background information regarding to the role of workplace on affecting people's performance. In today's industry creativity has a very special and important place because of the dynamic organizational changes and rapid growth of technology. To support these new working styles and specifically, to support creativity within an organization, flexible workplaces are often suggested. Since open-plan office offers more flexibility when compared to completely closed and private ones, they are seen to have more capabilities and are highly valued in today's industry. So the result of this study will contribute towards enhancing the understanding of the effect office design to enhance employees' performance, especially in creative tasks.
Anomaly detection with vision-based deep learning for epidemic prevention and control
Samani Hooman,Yang Chan-Yun,Li Chunxu,Chung Chia-Ling,Li Shaoxiang 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.1
During the COVID-19 pandemic, people were advised to keep a social distance from others. People’s behaviors will also be noticed, such as lying down because of illness, regarded as abnormal conditions. This paper proposes a visual anomaly analysis system based on deep learning to identify individuals with various anomaly types. In the study, two types of anomaly detections are concerned. The first is monitoring the anomaly in the case of falling in an open public area. The second is measuring the social distance of people in the area to warn the individuals under a short distance. By implementing a deep model named You Only Look Once, the related anomaly can be identified accurately in a wide range of open spaces. Experimental results show that the detection accuracy of the proposed method is 91%. In the social distance, the actual social distance is calculated by calculating the plane distance to ensure that everyone can meet the specification. Integrating the two functions and implementing the environmental monitoring system will make it easier to monitor and manage the disease-related abnormalities on the site.
Individual Control over the Physical Work Environment to Affect Creativity
Samani, Sanaz Ahmadpoor,Rasid, Siti Zaleha Binti Abdul,Sofian, Saudah Bt Korean Institute of Industrial Engineers 2015 Industrial Engineeering & Management Systems Vol.14 No.1
The purpose of this paper is to provide a review of the background information regarding to the impact of personal control over the physical work environment on satisfaction with work environment and creativity at work. Today creativity has a significant and special place in business especially in innovative organizations which need creative people to generate new, and useful ideas for produce new products, services, work methods, systems etc. Moreover the design and appearance of workspace and individual ability to control the ambient conditions of the workplace have significant effect on their behavior, satisfaction and overall outcome including creativity. So the result of this study will contribute towards enhancing the understanding of the effect of office design to enhance employees' creativity.
A robust design of Ru quantum dot/N-doped holey graphene for efficient Li-O2batteries
Nazarian-Samani, Masoud,Lim, Hee-Dae,Haghighat-Shishavan, Safa,Kim, Hyun-Kyung,Ko, Youngmin,Kim, Myeong-Seong,Lee, Suk-Woo,Kashani-Bozorg, Seyed Farshid,Abbasi, Majid,Guim, Hwan-Uk,Kim, Dong-Ik,Roh, K The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.2
<P>Herein, we report a simple, versatile, defect-engineered method to fabricate Ru quantum dots (Ru QDs) uniformly anchored on a nitrogen-doped holey graphene (NHG) monolith. It uses<I>in situ</I>pyrolysis of mixed glucose, dicyandiamide (DCDA), and RuCl3, followed by an acid treatment, and a final heat treatment to introduce in-plane holes of various sizes. A novel transmission method in scanning electron microscopy was successfully implemented to directly visualize the holes with color contrast. A low accelerating voltage of 5 kV enabled prolonged observation without significant electron beam damage. The mechanisms of hole creation were examined in detail using various characterization techniques as well as control experiments. The Ru QDs had significant catalytic activity and resulted in larger in-plane holes through the graphene sheets. The mechanical strain and the chemical reactivity of Ru QDs significantly diminished the activation energy barrier for the oxidation of CC bonds in the graphene structure. The Ru QD/NHG hybrid material was utilized as an electrocatalyst for the oxygen evolution reaction in Li-O2batteries, showing much lower charge overpotentials compared to the bare NHG counterpart. The defect-laden holey graphene counterpart can be highly functionalized for multiple applications, leading to a new method of nanoengineering based on atomic scale defects.</P>
Mahjouri-Samani, Masoud,Liang, Liangbo,Oyedele, Akinola,Kim, Yong-Sung,Tian, Mengkun,Cross, Nicholas,Wang, Kai,Lin, Ming-Wei,Boulesbaa, Abdelaziz,Rouleau, Christopher M.,Puretzky, Alexander A.,Xiao, K American Chemical Society 2016 Nano letters Vol.16 No.8
<P>Defect engineering has been a critical step in controlling the transport characteristics of electronic devices, and the ability to create, tune, and annihilate defects is essential to enable the range of next-generation devices. Whereas defect formation has been well-demonstrated in three-dimensional semiconductors, similar exploration of the heterogeneity in atomically thin two-dimensional semiconductors and the link between their atomic structures, defects, and properties has not yet been extensively studied. Here, we demonstrate the growth of MoSe2-x single crystals with selenium (Se) vacancies far beyond intrinsic levels, up to similar to 20%, that exhibit a remarkable transition in electrical transport properties from n- to p-type character with increasing Se vacancy concentration. A new defect-activated phonon band at similar to 250 cm(-1) appears, and the A(1g) Raman characteristic mode at 240 cm(-1) softens toward similar to 230 cm(-1) which serves as a fingerprint of vacancy concentration in the crystals. We show that post-selenization using pulsed laser evaporated Se atoms can repair Se-vacant sites to nearly recover the (p)roperties of the pristine crystals. First-principles calculations reveal the underlying mechanisms for the corresponding vacancy induced electrical and optical transitions.</P>
A Workplace to Support Creativity
Sanaz Ahmadpoor Samani,Siti Zaleha Binti Abdul Rasid,Saudah bt Sofian 대한산업공학회 2014 Industrial Engineeering & Management Systems Vol.13 No.4
The purpose of this paper is to provide a review of the background information regarding to the role of workplace on affecting people’s performance. In today’s industry creativity has a very special and important place because of the dynamic organizational changes and rapid growth of technology. To support these new working styles and specifically, to support creativity within an organization, flexible workplaces are often suggested. Since open-plan office offers more flexibility when compared to completely closed and private ones, they are seen to have more capabilities and are highly valued in today’s industry. So the result of this study will contribute towards enhancing the understanding of the effect office design to enhance employees’ performance, especially in creative tasks.
Delara Aarabi Samani,Ali Doostmohammadi,Mohammad Reza Nilforoushan,Hassan Nazari 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
Polycaprolactone (PCL) based nanocomposite scaffolds containing graphene (Gr) and baghdadite (BAG)nanoparticles were fabricated using the electrospinning method. Mechanical properties of the scaffolds were evaluated. Viability and adhesion of cells on the scaffolds were confirmed using fluorescence optical microscopy, MTT and FE-SEManalysis methods. The results indicated that incorporation of various concentrations of BAG from 1 to 3 wt% notablyimproved the mechanical properties. Cell adhesion assay revealed that the addition of BAG nanoparticles to PCL-Gr scaffoldcaused further adhesion, viability, and proliferation of the cells.