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Hydrogenation of monolayer molybdenum diselenide via hydrogen plasma treatment
Ma, K.,Yoon, S.,Jang, A. R.,Jeong, H.,Kim, Y. J.,Nayak, P.,Shin, H. Royal Society of Chemistry 2017 Journal of Materials Chemistry C Vol.5 No.43
<P>Functionalization of transition metal dichalcogenides has been studied with the aim of tuning their electrical and optical properties, but structural information during functionalization and its reversibility have not been elucidated. We report a simple and effective method for hydrogenation of monolayer MoSe2 using hydrogen plasma treatment. The covalent bonding of hydrogen to MoSe2 was confirmed by X-ray photoelectron spectroscopy, and the degree of hydrogenation was modulated from 32% to 80% by increasing the plasma treatment time from 5 to 40 s. Transmission electron microscopy confirmed a 1.5% reduction in the lattice constant of hydrogenated MoSe2 without structural damages or defects; crystal structures of hydrogenated MoSe2 and as-prepared MoSe2 were identical. Photoluminescence (PL) investigation of hydrogenated MoSe2 showed charge transfer from hydrogen to MoSe2. Furthermore, reversible desorption of hydrogen from hydrogenated MoSe2 was achieved by heat treatment. The optical and electrical properties of as-prepared and hydrogenated MoSe2 samples were compared. The PL peak of hydrogenated MoSe2 returned to the as-prepared one after heat treatment at 500 degrees C. Furthermore, the electron mobility of MoSe2 decreased from 29 to 9 cm(2) V-1 s(-1) after hydrogenation and was restored to 27 cm(2) V-1 s(-1) upon heat treatment at 500 degrees C. This reversible hydrogen adsorption and desorption lends control over the optical and electrical properties of monolayer MoSe2 and contributes to the hydrogen functionalization of monolayer transition metal dichalcogenides and other two-dimensional materials.</P>
Numerical evaluation of periodic nanowire-based phase sensitive surface plasmon resonance detection
Ma, K.,Kim, D.J.,Kim, D. Elsevier 2009 Current Applied Physics Vol.9 No.4
Localized surface plasmon (SP)-based amplification of sensitivity in a phase-sensitive SP resonance (SPR) biosensor is investigated numerically. SP is localized by surface-relief periodic nanowires. An optimum sample obtained by modeling DNA hybridization and water-glycerin mixture employed a gold grating with 300nm period and 10nm thickness on a gold film and an SF10 glass substrate. The localized SPR structure was shown to have the sensitivity enhanced by more than 10 times than conventional SPR for detecting DNA hybridization at an identical film thickness of 40nm. The enhancement was found to be associated with field localization near the nanostructure. The results suggest a novel approach of improving the sensitivity of SPR detection.
Control Effect on Root-knot Nematodes by Hot Water Dipping Treatment in Kiwifruit
Ma, K.,Cho, Y.,Jeong, B.,Choi, D. Korean Association of Organic Agriculture 2011 韓國有機農業學會誌 Vol.19 No.S
When kiwifruit root system infected with nematodes was treated by hot water dipping treatment, the maximum temperature for this treatment was suggested as $50^{\circ}C$. The lowest killing temperature of internal root-knot in the root tissue was $48^{\circ}C$. Consequently, root-knot nematodes could be killed without damaging root tissues by the hot water dipping treatment at $48^{\circ}C$ for 10 minutes. This could be useful for organic production and distribution of kiwifruit seedlings by avoiding the synthetic nematicides which are not easily decomposed in soil once applied.
The Nested Variable Model of FDI Spillover Effects: Estimation Using Hungarian Panel Data
Ichiro Iwasaki,PÉTER CSIZMADIA,MIKLÓS ILLÉSSY,CSABA MAKÓ,MIKLÓS SZANYI 한국국제경제학회 2012 International Economic Journal Vol.26 No.4
A new empirical model is presented that considers the productivity spillover effects of foreign direct investment (FDI) by focusing on the multi-layered structure of industrial classifications. In this model, the market presence of horizontal FDI in a host country is expressed using multiple spillover variables with a nested structure corresponding to the aggregated level of industrial classification. Using large-scale firm-level data from Hungary, we estimated the nested variable model and verified horizontal FDI spillover effects that cannot be captured with the conventional model having a single horizontal variable.
The valley Hall effect in MoS<sub>2</sub> transistors
Mak, K. F.,McGill, K. L.,Park, J.,McEuen, P. L. American Association for the Advancement of Scienc 2014 Science Vol.344 No.6191
<P><B>Using the valleys in monolayer MoS<SUB>2</SUB></B></P><P>The electronic structure of the two-dimensional material MoS<SUB>2</SUB> has two distinct “valleys” of energy that may help to carry information in future electronic devices. Mak <I>et al.</I> observed the so-called valley Hall effect in a monolayer of MoS<SUB>2</SUB>. The electrons from different valleys moved in opposite directions across the sample, with one valley being overrepresented with respect to the other. The scientists achieved this by shining circularly polarized light on the material, which created an imbalance in the population of the two valleys. The findings may enable practical applications in the newly formed field of valleytronics.</P><P><I>Science</I>, this issue p. 1489</P>
USING WALKING-WITH APPROACH TO EXPLORE EMBODIED DINING PRACTICES FOR WORKPLACE IMPRESSION MANAGEMENT
Connie MAK 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
Consumer studies mainly take a cross-sectional approach to understand leisure and home consumption. This paper takes the mundane workplace as a unit of consumption and adopts a processual view to understand what and how cultural capital for impression management is acquired and changes over career trajectories. Integrating the theories of Goffman (1959) and Bourdieu (1977; 1984; 1990), the study explores how embodied habitual practices (habitus) enables and shapes impression management to build desirable work identity (Hallett, 2003). The walking-with interviews are used to seek conversations with senior executives in Hong Kong along their work routes. It proves to be a proficient approach and data collection technique to explore mundane consumption practices where knowledge is incorporated with people’s competence and artefacts (Mak, Lai, Tsaousi, & Davies, 2022). Among different resources for impression management, dining knowledge emerged as a significant cultural practices for performative self and building up of social capital.
Mak-Soon Lee,Yoonjin Shin,Sohee Moon,Seunghae Kim,Yangha Kim 한국식품영양과학회 2016 Preventive Nutrition and Food Science Vol.21 No.4
Mitochondrial biogenesis is a complex process requiring coordinated expression of nuclear and mitochondrial genomes. The peroxisome proliferator-activated receptor gamma co-activator 1-alpha (PGC-1α) is a key regulator of mitochondrial biogenesis, and it controls mitochondrial DNA (mtDNA) replication within diverse tissues, including muscle tissue. The aim of this study was to investigate the effects of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on mtDNA copy number and PGC-1α promoter activity in C₂C12 muscle cells. mtDNA copy number and mRNA levels of genes related to mitochondrial biogenesis such as PGC-1α, nuclear respiratory factor 1 (NRF1) and mitochondrial transcription factor A (Tfam) were assayed by quantitative real-time PCR. The PGC-1α promoter from −970 to +412 bp was subcloned into the pGL3-basic vector, which includes a luciferase reporter gene. Both EPA and DHA significantly increased mtDNA copy number, dose and time dependently, and up-regulated mRNA levels of PGC-1α, NRF1, and Tfam. Furthermore, EPA and DHA stimulated PGC-1α promoter activity in a dose-dependent manner. These results suggest that EPA and DHA may modulate mitochondrial biogenesis, which was partially associated with increased mtDNA replication and PGC-1α gene expression in C₂C12 muscle cells.
Atomically ThinMoS2: A New Direct-Gap Semiconductor
Mak, Kin Fai,Lee, Changgu,Hone, James,Shan, Jie,Heinz, Tony F. American Physical Society 2010 Physical Review Letters Vol.105 No.13
<P>The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,??6 S-Mo-S monolayers have been investigated by optical spectroscopy. Through characterization by absorption, photoluminescence, and photoconductivity spectroscopy, we trace the effect of quantum confinement on the material's electronic structure. With decreasing thickness, the indirect band gap, which lies below the direct gap in the bulk material, shifts upwards in energy by more than 0.6 eV. This leads to a crossover to a direct-gap material in the limit of the single monolayer. Unlike the bulk material, the MoS2 monolayer emits light strongly. The freestanding monolayer exhibits an increase in luminescence quantum efficiency by more than a factor of 10^{4} compared with the bulk material.</P>