Kinetically Enhanced Bubble-Exfoliation of Graphite toward High-Yield Preparation of High-Quality Graphene

He, Peng; Gu, Hengfei; Wang, Gang; Yang, Siwei; Ding, Guqiao; Liu, Zhi; Xie, Xiaoming

doi:10.1021/acs.chemmater.7b02752

Cited by 45 publications

(26 citation statements)

References 17 publications

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“…Two predominant peaks were observed at 531.7 and 285.0 eV (Figure S1, Supporting Information), corresponding to O 1 s and C 1 s , respectively. [ 33 ] The high‐resolution C 1 s spectra (Figure 1g) show that GOQDs mainly contain CC/CC at 284.6 eV (31.07%), CO at 286.1 eV (52.19%), and CO at 287.5 eV (16.74%). [ 34 ] This indicates that there are abundant oxygen‐containing functional groups in GOQDs.…”

Section: Resultsmentioning

confidence: 99%

Flexible Artificial Memristive Synapse Constructed from Solution‐Processed MgO–Graphene Oxide Quantum Dot Hybrid Films

Chen

Yang

Wang

et al. 2021

Adv Elect Materials

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Inspired by the low energy consumption and highly parallel processing power of the biological neuromorphic system, the development of a brain‐inspired computing paradigm with electronic devices based artificial synapse may play an essential role in eliminating the Von Neumann bottleneck. Among candidate electronic devices, memristive devices have shown great potential for artificial synapse because of its tunable resistive switching (RS) behaviors. Herein, a biological synapse with solution‐processed MgO‐graphene oxide quantum dots (MgO‐GOQDs) based memristor is developed. The device exhibits highly controllable RS behavior owing to the enhancement of the local electric field by GOQDs and redox of GOQDs under electric fields. Moreover, essential biosynaptic functions including paired‐pulse facilitation, short‐term plasticity (STP)/long‐term plasticity (LTP), STP to LTP transition, and spike‐time‐dependent plasticity are successfully emulated. It is noteworthy that the device fabricated on a polyethylene terephthalate substrate also presents stable RS behavior after a large number of bending cycles. This study demonstrates the great potential of solution‐processed MgO–GOQD hybrid film on its application for the realization of flexible artificial neural networks.

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Section: Resultsmentioning

confidence: 99%

Flexible Artificial Memristive Synapse Constructed from Solution‐Processed MgO–Graphene Oxide Quantum Dot Hybrid Films

Chen

Yang

Wang

et al. 2021

Adv Elect Materials

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“…[ 34 ] The blue‐shift of G peak from 1615 to 1580 cm −1 can be attributed to the electron transfer and formation of carbocations for graphite intercalated compounds. [ 21,23,35 ] The stable D peak shows that only few defects are produced during the exfoliation process. [ 36 ] Compared to I 2D /I G ratio of chemical reduced graphene oxide and electrochemically efoliated graphene, [ 37 ] the value, ≈0.96, exhibits less defects in GNPs in this study.…”

Section: Resultsmentioning

confidence: 99%

“…Three peaks at 284.7, 285.5, and 286.6 eV can be assigned to CC, CC, and CO bond, respectively. [ 21,25 ] Moreover, thermogravimetric analysis (TGA) measurements were further used to evaluate its thermostability. As shown in Figure 4c, the total weight loss between 25 and 700 °C is around 14.6 wt%.…”

Section: Resultsmentioning

confidence: 99%

“…To overcome this drawback, bubble generation originated from chemical reaction, as a low‐cost alternative, was applied for the exfoliation of graphite. [ 21–23 ] Here, the bubbles were generated following by the catalytic decomposition of hydrogen peroxide or others and that realization not only improves the exfoliation efficiency of graphene but also decreases its energy consumption. [ 23–25 ]…”

Section: Introductionmentioning

confidence: 99%

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Understanding Oxygen Bubble‐Triggered Exfoliation of Graphite Toward the Low‐Defect Graphene

Yang

Zhang

Liu

et al. 2021

Adv Materials Inter

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Although graphene has been developed and widely used in many fields over the past decades, the effect of oxygen (O2) on the exfoliation of graphite is still unclear. Here, a simple bubble‐triggered exfoliation method is employed for controllable synthesis of graphene nanoplatelets (GNPs) with low‐oxidation level and high electrical conductivity. The exfoliation process is studied and a formation mechanism for the synthesis of the low‐defect GNPs is proposed. The results show that the synergistic effect of H2SO4 and H2O2 plays an important role in the procession of exfoliation of graphite. Moreover, density functional theory (DFT) simulations exhibit that H2O2 would preferentially adsorb on the edge of graphite, indicating the possibility to initiate the exfoliation by O2. In the whole process, some oxygen free radicals can be released from H2O2, resulting in some O2 and oxygen functional groups formed on the graphite edge, and which can finally lead to the fast exfoliation of graphite. In addition, a time‐dependent temperature profile under an applied voltage of 5 V exhibits a steady‐state with temperature up to 275 °C. Overall, this work elucidates the selectivity of gas bubble absorbed on the side edge of graphite and presents a potential application for high‐electrical conductivity graphene.

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“…Otros autores han llevado a cabo esta técnica utilizando diferentes disolventes como N-metilpirrolidona [156], dodecilbencenosulfonato de sodio [158] o una mezcla entre N-metil-2-pirrolidona y N-ciclohexil-2-pirrolidona [159]. Hay otras estrategias para este método, como la exfoliación por burbujas [160,161].…”

Section: Exfoliación En Fase Líquidaunclassified

Funcionalización de textiles mediante la aplicación de grafeno

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Kinetically Enhanced Bubble-Exfoliation of Graphite toward High-Yield Preparation of High-Quality Graphene

Abstract: G raphene, owing to its unique properties, has attracted considerable attention from both fundamental and applied science communities over the past decade. 1 Highquality graphene often exhibits excellent performance in applications such as energy storage and electronics. 2,3 There-

Cited by 45 publications

References 17 publications

Flexible Artificial Memristive Synapse Constructed from Solution‐Processed MgO–Graphene Oxide Quantum Dot Hybrid Films

Flexible Artificial Memristive Synapse Constructed from Solution‐Processed MgO–Graphene Oxide Quantum Dot Hybrid Films

Understanding Oxygen Bubble‐Triggered Exfoliation of Graphite Toward the Low‐Defect Graphene

Funcionalización de textiles mediante la aplicación de grafeno

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