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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.
Benefits of Bio-inoculant Immobilization Process for the Development of Biofertilizers
Mak Chanratana, Ki-Yoon Kim, Walitang Denver, Sandipan Samaddar, Poulami Chatterjee,Shamim Ahmed, Yeon-Gyeong Kang, Sun-Young Jeon, Chae-Eun Pyo, and Tong-Min Sa 忠北大學校 農業科學硏究所 2016 農業科學硏究 Vol.32 No.2
Meeting the society’s increasing demand for food and energy require sustainable and readily�ᅠ�ᅠ available sources. The green revolution has been instrumental in creating sufficient crop productivity and maintained soil fertility. In the context of sustainable agriculture, the utilization of biofertilizers is of paramount importance. Commercial biofertilizers (bacteria/fungi) and their association directly or indirectly provide a beneficial effect on plant growth by increasing the supply and/or availability of nutrients to the host plant. However, large scale and field application of plant growth promoting microorganisms (PGPMs) as bioinoculant are still limited. Some of the major limitations are related to poor quality, short shelf-life and the lack of applicable formulation for bioinoculant. Immobilization using polymer matrix has been promising in enhancing protection, shelf life and slow release of bioinoculants. Furthermore, bacterial growth after immobilization in the polymer matrix is promoted with the supplementation of essential nutrients. The present review highlights the beneficial impacts of liquid formulation and exploiting alginate immobilized PGPMs for eco-friendly and sustainable crop production.