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Organic nano-floating-gate transistor memory with metal nanoparticles
Van Tho Luu,Baeg Kang-Jun,Noh Yong-Young 나노기술연구협의회 2016 Nano Convergence Vol.3 No.10
Organic non-volatile memory is advanced topics for various soft electronics applications as lightweight, low-cost, flexible, and printable solid-state data storage media. As a key building block, organic field-effect transistors (OFETs) with a nano-floating gate are widely used and promising structures to store digital information stably in a memory cell. Different types of nano-floating-gates and their various synthesis methods have been developed and applied to fabricate nanoparticle-based non-volatile memory devices. In this review, recent advances in the classes of nano-floating-gate OFET memory devices using metal nanoparticles as charge-trapping sites are briefly reviewed. Details of device fabrication, characterization, and operation mechanisms are reported based on recent research activities reported in the literature.
Van-Tho Hoang,이대성,남영우,권진회 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.2
A numerical study was conducted to investigate the tensile behavior of carbon fiber-reinforced polymer (CFRP) scarf-repaired structures with different scarf ratios (1/5, 1/10, 1/20, and 1/30) using two approaches associated with the finite element method (FEM): the damage zone model (DZM) and cohesive zone model (CZM). The experimental data of CFRP laminates with the stacking sequence [45/ − 45/ − 45/0/90/0/45/ − 45/90/0]S, an over-ply layer (additional ply covering the outermost layer of the scarf-patch-repaired structure), and four different scarf ratios were obtained and analyzed. First, an empirical formula was established to describe the mathematical relationship and correlation between the failure load and scarf angle. Subsequently, the strength recovery rate was calculated to evaluate the mechanical performance of the scarf-repaired structures with different scarf ratios. Finally, the experimental data were used to verify the numerical results. The experimental and numerical results exhibited good agreement with each other. The effect of the scarf angle of scarf-patch-repaired composite laminates on the selection of the reference sample in the DZM method and the cohesive parameters in the CZM method were discussed as well.
Van-Tho Hoang,염영진 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
Multi-walled carbon nanotubes (MWCNTs) were mixed with Unsaturated polyester resin (UPR) using the stir method at high temperatures. The mixing temperature and hardener ratio were optimized based on compression properties and the exothermic temperature. In the experiment, 60 °C and 1 wt.% of Methyl ethyl ketone peroxide (MEKP) were chosen for the mixing condition and catalyst concentration, respectively. MWCNTs with different weight fractions (0.05, 0.1, 0.2 and 0.3 wt.%) were dispersed to investigate the effect of MWCNTs on tensile properties of the UPR, and it was found that 0.1 wt.% of MWCNTs showed the best performance in this range of fiber weight fraction due to a higher strength (42.14 %), modulus (14.33 %) and fracture strain (37.17 %) than pure UPR. The state of dispersion and arrangement of fibers were examined by a Field emission Scanning electron microscope (FE-SEM) according to fracture surfaces. Similarly, the FE-SEM also showed better results with 0.1 wt.% of MWCNTs mixed in the UPR.
Hoang Van Tho,Young Jin Yum(염영진) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Carbon fillers like multiwalled carbon nanotubes (MWCNT or CNT) and graphene oxide (GO) etc. have superlative mechanical and physical properties. They are widely applied in composite materials with high potential to increase mechanical properties of matrix. The dispersion of nano fillers is the key to evaluate bonding properties of Unsaturated Polyester Resin (UPR). Tensile specimens were fabricated by cast molding with the difference types of nano carbon fillers dispersed by stirring and sonication technique. 0.1 wt.% of MWCNT or GO separately and both of them were mixed with UPR. As the result, Young’s modulus increased significantly due to the appearance of nano fillers in all cases. On the other hand, the mixture of CNT and UPR showed the highest tensile strength and fracture strain. However, the mixture of GO with UPR showed no good effect on ultimate strength and GO combined with CNT also showed the same behavior. Moreover, higher of nano filler ratio, smaller fracture strain of mixture was shown. Scanning electron microscope (SEM) was used as the evidence to evaluate the strength effect of nano particles at the fracture surface of specimens based on their dispersion in UPR.