Graphene-quantum-dot nonvolatile charge-trap flash memories

Joo, Soong Sin; Kim, Jungkil; Kang, Soo Seok; Kim, Sung Hoon; Choi, Suk‐Ho; Hwang, Sung Won

doi:10.1088/0957-4484/25/25/255203

Cited by 25 publications

(10 citation statements)

References 24 publications

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“…2b , Supplementary Figs. 6 and 7 ), despite the non-flat and amorphous nature of carbon membrane on the TEM grid, the (1120) crystal lattice of graphene (~ 0.246 nm) is resolved, indicating the high crystalline nature of the sample 22 . In the Raman spectra (Fig.…”

Section: Resultsmentioning

confidence: 99%

Raman enhancement on ultra-clean graphene quantum dots produced by quasi-equilibrium plasma-enhanced chemical vapor deposition

et al. 2018

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Graphene is regarded as a potential surface-enhanced Raman spectroscopy (SERS) substrate. However, the application of graphene quantum dots (GQDs) has had limited success due to material quality. Here, we develop a quasi-equilibrium plasma-enhanced chemical vapor deposition method to produce high-quality ultra-clean GQDs with sizes down to 2 nm directly on SiO2/Si, which are used as SERS substrates. The enhancement factor, which depends on the GQD size, is higher than conventional graphene sheets with sensitivity down to 1 × 10−9 mol L−1 rhodamine. This is attributed to the high-quality GQDs with atomically clean surfaces and large number of edges, as well as the enhanced charge transfer between molecules and GQDs with appropriate diameters due to the existence of Van Hove singularities in the electronic density of states. This work demonstrates a sensitive SERS substrate, and is valuable for applications of GQDs in graphene-based photonics and optoelectronics.

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Section: Resultsmentioning

confidence: 99%

Raman enhancement on ultra-clean graphene quantum dots produced by quasi-equilibrium plasma-enhanced chemical vapor deposition

et al. 2018

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“…Moreover, GQDs possess the excellent characteristics of quantum confinement and edge effects. Therefore, GQDs have attracted tremendous and increasing research interest about the potential application in various aspects, such as nonvolatile flash memory capacitors (Sin Joo et al, ), temperature sensors (Wan et al, ), composite materials (Stankovich et al, ), battery materials (Liu et al, ), water purification, and separation of aromatic dyes (Ying, He, Ding, & Peng, ). In biomedical aspects, GQDs potentially serve as an excellent tool for targeted cellular imaging (Wang et al, ), drug delivery (Wang et al, ), DNA cleavage system (Wang et al, ), and as biosensors.…”

Section: Introductionmentioning

confidence: 99%

The effects of graphene quantum dots on the maturation of mouse oocytes and development of offspring

Lin

Zhuang

Wang

et al. 2019

Journal Cellular Physiology

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Recently, graphene nanomaterials have attracted tremendous attention and have been utilized in various fields because of their excellent mechanical, thermal, chemical, optical properties, and good biocompatibility, especially in biomedical aspects. However, there is a concern that the unique characteristics of nanomaterials may have undesirable effects. Therefore, in this study, we sought to systematically investigate the effects of graphene quantum dots (GQDs) on the maturation of mouse oocytes and development of the offspring via in vitro and in vivo studies. In vitro, we found that the first polar body extrusion rate in the high dosage exposure groups (1.0–1.5 mg/ml) 2 decreased significantly and the failure of spindle migration and actin cap formation after GQDs exposure was observed. The underlying mechanisms might be associated with reactive oxygen species accumulation and DNA damage. Moreover, transmission electron microscope studies showed that GQDs may have been internalized into oocytes, tending to accumulate in the nucleus and severely affecting mitochondrial morphology, which included swollen and vacuolated mitochondria accompanied by cristae alteration with a lower amount of dense mitochondrial matrix. In vivo, when pregnant mice were exposed to GQDs at 8.5 days of gestation (GD, 8.5), we found that high dosage of GQD exposure (30 mg/kg) significantly affected mean fetal length; however, all the second generation of female mice grew up normal, attained sexual maturity, and gave birth to a healthy offspring after mating with a healthy male mouse. The results presented in this study are important for the future investigation of GQDs for the biomedical applications.

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“…Charges can be stored either in the quantized levels of these nano-sized graphene, or trapped in the oxygenated groups with high electron affinity. Recently, several graphenebased CTM (GCTM) devices [24][25][26][27] have been reported. In this paper, the TID effects on GCTM devices are investigated with 60 Co γ-ray irradiation.…”

Section: Introductionmentioning

confidence: 99%

Total ionizing dose effects on graphene-based charge-trapping memory

Majumdar

et al. 2019

Sci. China Inf. Sci.

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This study investigates the total ionizing dose effects in graphene-based charge-trapping memory (GCTM) capacitors by using 60 Co γ-irradiation. Electrical properties including C −V hysteresis window, gate leakage current, and flat band voltage shifts are evaluated with ionizing dose levels up to 1 Mrad (Si). The C −V hysteresis memory window is hardly affected by the irradiation. The gate leakage current increases with the increase of ionizing dose due to the multiple-trap assisted tunneling mechanism. Significant electrical degrade of the devices in programmed and erased states has been observed with the increase of the dose levels. Mechanisms behind the degradation are attributed to the photo-emission in the graphene nanodisc charge-trapping sets, radiation-induced holes trapping in the peripheral oxides, and the recombination of the stored electrons with the radiation-induced holes.

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Graphene-quantum-dot nonvolatile charge-trap flash memories

Cited by 25 publications

References 24 publications

Raman enhancement on ultra-clean graphene quantum dots produced by quasi-equilibrium plasma-enhanced chemical vapor deposition

Raman enhancement on ultra-clean graphene quantum dots produced by quasi-equilibrium plasma-enhanced chemical vapor deposition

The effects of graphene quantum dots on the maturation of mouse oocytes and development of offspring

Total ionizing dose effects on graphene-based charge-trapping memory

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