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RISS 인기검색어
- 검색키워드
- 저자 : ( Abdullah Alrasheed ) (검색결과 2 건)
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Surface Properties of Laser-Treated Molybdenum Disulfide Nanosheets for Optoelectronic Applications
Alrasheed, Abdullah,Gorham, Justin M.,Tran Khac, Bien Cuong,Alsaffar, Fadhel,DelRio, Frank W.,Chung, Koo-Hyun,Amer, Moh. R. American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.21
<P>Transition metal dichalcogenide two-dimensional materials have attracted significant attention due to their unique optical, mechanical, and electronic properties. For example, molybdenum disulfide (MoS<SUB>2</SUB>) exhibits a tunable band gap that strongly depends on the numbers of layers, which makes it an attractive material for optoelectronic applications. In addition, recent reports have shown that laser thinning can be used to engineer an MoS<SUB>2</SUB> monolayer with specific shapes and dimensions. Here, we study laser-thinned MoS<SUB>2</SUB> in both ambient and vacuum conditions via confocal μ-Raman spectroscopy, imaging X-ray photoelectron spectroscopy (i-XPS), and atomic force microscopy (AFM). For low laser powers in ambient environments, there is insufficient energy to oxidize MoS<SUB>2</SUB>, which leads to etching and redeposition of amorphous MoS<SUB>2</SUB> on the nanosheet as confirmed by AFM. At high powers in ambient, the laser energy and oxygen environment enable both MoS<SUB>2</SUB> nanoparticle formation and nanosheet oxidation as revealed in AFM and i-XPS. At comparable laser power densities in vacuum, MoS<SUB>2</SUB> oxidation is suppressed and the particle density is reduced as compared to ambient. The extent of nanoparticle formation and nanosheet oxidation in each of these regimes is found to be dependent on the number of layers and laser treatment time. Our results can shed some light on the underlying mechanism of which atomically thin MoS<SUB>2</SUB> nanosheets exhibit under high incident laser power for future optoelectronic applications.</P> [FIG OMISSION]</BR>
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( Wazzan S. Aljuhani ),( Salman S. Qasim ),( Abdullah Alrasheed ),( Jumanah Altwalah ),( Mohammed J. Alsalman ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-
Background: The posterior tibial slope (PTS) is crucial in knee joint stability and in maintaining the natural movement of the knee. An increase in the PTS is associated with various knee pathologic conditions, such as anterior cruciate ligament (ACL) injury and anterior tibial translation (ATT). In the present study, we aimed to establish native medial and lateral PTS values for adult Saudis and to identify any association between PTS and gender, age, and body mass index (BMI). Materials and methods: A total of 285 consecutive, normal, magnetic resonance imaging (MRI) studies of the knee were included in the study. The PTS was measured using the proximal anatomical axis of the tibia. The Kruskal-Wallis test was used to compare the medial and lateral PTS angles between age groups. The difference between the medial and lateral posterior tibial slopes was assessed using the Wilcoxon signed-rank test. The Mann-Whitney U test was performed to compare the medial and lateral PTS angles between men and women. Age, gender, and BMI were analyzed by multivariate linear regression to determine whether they positively predict the medial and lateral PTS angles. Results: The mean physiological medial PTS was 5.86 ± 3.0° and 6.61 ± 3.32°, and the lateral PTS was 4.41 ± 3.35° and 4.63 ± 2.85° in men and women, respectively. This difference showed no statistically significant gender dimorphism (p > 0.05). The medial PTS was significantly larger than the lateral PTS (p < 0.0001). There was no statistically significant difference in the medial and lateral PTS angles between age groups (p > 0.05). Higher BMI was significantly associated with a steeper medial PTS (p = 0.001). Conclusions: This study provided native values for medial and lateral PTS angles in Saudis, which can assist surgeons in maintaining normal knee PTS during surgery. The PTS was not influenced by age. The medial PTS was significantly larger than the lateral PTS in men and women. The PTS showed no significant gender dimorphism. BMI was significantly associated with the medial PTS.
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