Fully-transparent graphene charge-trap memory device with large memory window and long-term retention

Lee, Sejoon; Lee, Seung Joo; Kim, Sung Min; Song, Emil B.

doi:10.1016/j.carbon.2017.10.089

Cited by 15 publications

(4 citation statements)

References 43 publications

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“…, graphene and transition metal dichalcogenides) have emerged recently as highly functional semiconductors or insulators for the application of next-generation smart electronic and optoelectronic devices. For example, graphene barristors, graphene-based high speed devices, , graphene single-electron transistors, graphene quantum-dot transistors, robust graphene flash memories, − high-detectivity MoS 2 phototransistors, and low-power h-BN memristors are tangible examples that can realize future nanoelectronics technology. Furthermore, spintronic devices with some distinctive functionalities have also been proposed and demonstrated on various 2D materials and their heterostructures ( e.g.…”

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confidence: 99%

Room-Temperature Ferromagnetic Ultrathin α-MoO₃:Te Nanoflakes

Lee

Kwon

et al. 2019

ACS Nano

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We materialized room-temperature ferromagnetism in ultrathin α-MoO3:Te nanoflakes. The α-MoO3:Te nanoflakes, which had been grown by vapor-phase epitaxy, clearly exhibited an Ag Raman band from symmetric stretching of υ(Mo–O3–Mo) in the 2D-like ultrathin α-MoO3:Te layer. Due to the intentional incorporation of smaller Te ions into bigger Mo sites, the pentacoordinated Mo5+ bonds were created inside the orthorhombic α-MoO3:Te lattice system. Since Mo5+ ions have magnetic moments from unpaired electron spins, a large number of overlapped bound magnetic polarons could be formed via ferromagnetic coupling with charged oxygen vacancies that are inevitably generated at pentacoordinated [Mo5+O5] centers. This gives rise to the increase in long-range ferromagnetic ordering and leads to room-temperature ferromagnetism in the entire α-MoO3:Te solid-state system. The results may move a step closer to the demonstration of spin functionalities in the wide bandgap semiconductor α-MoO3:Te.

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confidence: 99%

Room-Temperature Ferromagnetic Ultrathin α-MoO₃:Te Nanoflakes

Lee

Kwon

et al. 2019

ACS Nano

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“…The D band arises from the disordered graphitic AC, and the G band belongs to the E 2g vibrational Raman scattering mode at sp 2 -hybridized carbon lattices [82,83]. The large intensity ratio of I G /I D (≈1.02) implies that the AC nanosheets in MoO 3 /AC were highly graphitized with small numbers of stacked layers [84][85][86][87][88][89][90][91][92]. Thus, one can conjecture the present MoO 3 /AC nanocomposites to comprise highly conductive AC that may improve the electrical conductivity of the entire MoO 3 /AC nanocomposite system.…”

Section: Resultsmentioning

confidence: 99%

Excellent Bifunctional Water Electrolysis Activities of α‐MoO₃/AC Nanocomposites

Sekar,

Yun,

Park

et al. 2024

International Journal of Energy Research

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Electrocatalytic water splitting is a cost-effective and environment-friendly technique for producing oxygen and hydrogen through the oxygen/hydrogen evolution reaction (OER/HER). Developing the highly active and stable electrocatalyst, particularly for bifunctional water electrolysis (i.e., both OER and HER), is still a formidable challenge. Herein, we demonstrated the enhanced bifunctional water splitting activities by utilizing the molybdenum trioxide-anchored activated carbon (MoO3/AC) nanocomposites. The MoO3/AC samples were fabricated by the ultrasonication method using sol-gel synthesized MoO3 and biomass-derived AC, and they displayed a nanostreusel-like morphology with spherical MoO3 nanoparticle-decorated AC nanosheets. For the water electrolysis test, the MoO3/AC nanocomposites exhibited the excellent bifunctional electrocatalytic OER and HER performances with low overpotential and small Tafel slope values. Through analyzing the material characteristics and the electrochemical properties of MoO3/AC, it was found that the superb bifunctional OER-HER activities were attributed to the synergistic effects from the hybridization of highly conductive AC and electrochemically active α-MoO3. The results pronounce that the MoO3/AC nanocomposites possess an aptitude as a superb bifunctional OER/HER electrocatalyst for high-performance water electrolysis.

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“…From the Raman scattering spectroscopy measurement, the sample also revealed its intrinsic vibration properties from only Si and C. As displayed in Figure 2 b, the sample showed the four predominant Raman bands at 514, 959, 1341, and 1590 cm −1 from Si and C. The former two bands at 514 and 959 cm −1 originate from the first and the second order transversal optical (TO) mode of crystalline Si [ 58 , 59 ], respectively; and the latter two vibration modes at 1341 and 1590 cm −1 come from D (sp 3 type) and G (sp 2 type) bands of graphitized C, respectively [ 60 , 61 ]. Here, it should be noticeable that the C nanoflakes exhibited the high intensity area ratio of I D /I G (i.e., Asp 3 /Asp 2 ≅ 0.99), indicative of the high graphitization (i.e., ultrathin C layers) and large amount of sp 2 carbon exists in the composite system [ 39 , 53 , 60 , 62 , 63 , 64 ]. The absence of extra lattice phases and their vibrations depict that the high purity C-Si nanocomposites were well-crystallized with their intrinsic carbonaceous and siliceous resources via the one-pot synthesis of magnesiothermic reduction using biomass BRH ashes.…”

Section: Resultsmentioning

confidence: 99%

One-Pot Synthesized Biomass C-Si Nanocomposites as an Anodic Material for High-Performance Sodium-Ion Battery

Lee

Kim

2020

Nanomaterials

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Aiming at materializing an excellent anodic source material of the high-performance sodium-ion battery (SIB), we fabricated the biomass carbon-silicon (C-Si) nanocomposites by the one-pot synthesis of facile magnesiothermic reduction using brown rice husk ashes. The C-Si nanocomposites displayed an aggregated morphology, where the spherical Si nanoparticles (9 nm on average) and the C nanoflakes were encapsulated and decorated with each other. When utilizing the nanocomposites as an SIB anode, a high initial discharge capacity (i.e., 378 mAh/g at 100 mA/g) and a high reversible capacity (i.e., 122 mAh/g at 200 mA/g) were achieved owing to their enhanced electronic and ionic conductivities. Moreover, the SIB device exhibited a high cyclic stability in its Coulombic efficiency (i.e., 98% after 100 charge-discharge cycles at 200 mA/g). These outstanding results depict that the one-pot synthesized biomass C-Si nanocomposites are beneficial for future green energy-storage technology.

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Fully-transparent graphene charge-trap memory device with large memory window and long-term retention

Cited by 15 publications

References 43 publications

Room-Temperature Ferromagnetic Ultrathin α-MoO₃:Te Nanoflakes

Room-Temperature Ferromagnetic Ultrathin α-MoO₃:Te Nanoflakes

Excellent Bifunctional Water Electrolysis Activities of α‐MoO₃/AC Nanocomposites

One-Pot Synthesized Biomass C-Si Nanocomposites as an Anodic Material for High-Performance Sodium-Ion Battery

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Fully-transparent graphene charge-trap memory device with large memory window and long-term retention

Cited by 15 publications

References 43 publications

Room-Temperature Ferromagnetic Ultrathin α-MoO3:Te Nanoflakes

Room-Temperature Ferromagnetic Ultrathin α-MoO3:Te Nanoflakes

Excellent Bifunctional Water Electrolysis Activities of α‐MoO3/AC Nanocomposites

One-Pot Synthesized Biomass C-Si Nanocomposites as an Anodic Material for High-Performance Sodium-Ion Battery

Contact Info

Product

Resources

About

Room-Temperature Ferromagnetic Ultrathin α-MoO₃:Te Nanoflakes

Room-Temperature Ferromagnetic Ultrathin α-MoO₃:Te Nanoflakes

Excellent Bifunctional Water Electrolysis Activities of α‐MoO₃/AC Nanocomposites