Tunable degree of oxidation in graphene oxide: cost effective synthesis, characterization and process optimization

Pareek, Shubhra; Jain, Deepti; Shrivastava, Rahul; Dam, Siddhartha; Hussain, Shamima; Behera, Debasis

doi:10.1088/2053-1591/ab243a

Cited by 14 publications

(14 citation statements)

References 71 publications

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“…The Raman spectra of lubricants with different pH values are approximately similar to two distinct peaks (D and G bands). Moreover, D band at 1342.59 cm −1 depends on the defects of structure, and G band at 1594.19 cm −1 depends on the in‐plane stretching vibration of sp 2 C atom, both corresponding to the carbon material 38 . The discovery indicates that GO could adsorb on the strip surface to achieve protection effect.…”

Section: Resultsmentioning

confidence: 91%

pH‐dependent lubrication mechanism of graphene oxide aqueous lubricants on the strip surface during cold rolling

Meng

Sun

Wang

et al. 2020

Surface & Interface Analysis

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The tribological performance and lubrication mechanism of graphene oxide (GO) aqueous lubricants with different pH levels on the strip surfaces during cold rolling were investigated. And triethanolamine (TEA) was used to adjust the pH levels of GO lubricants. The morphology of GO and physical characterization of GO lubricants were carried out. Four‐ball tribological tests and cold rolling experiments were conducted to obtain the tribological behaviors of GO lubricants on the strip surfaces. To figure out the lubrication mechanism, the surfaces of the rolled strips using GO lubricants were analyzed utilizing a series of experiments. The increase in the pH value of lubricants changed the intrinsic structure of GO, resulting in better dispersibility and wettability. The change of physical characteristics significantly improved the antifriction and antiwear properties of lubricants, and the alkaline lubricant (pH 9.0) exhibited the best lubrication performance. A diameter–height ratio (λd) applied by a calculation method was proposed to approximatively ascertain the lubrication regime during the cold rolling. The λd and the surface quality of the rolled strips indicated that the lubrication regime was the boundary lubrication when using the alkaline lubricant. Moreover, GO particles in the alkaline lubricant could repair the strip surface by mending effect and form the physically adsorbed layers. The layers prevented direct contact between rolled surfaces, further amending the surface quality of the rolled strips.

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Section: Resultsmentioning

confidence: 91%

pH‐dependent lubrication mechanism of graphene oxide aqueous lubricants on the strip surface during cold rolling

Meng

Sun

Wang

et al. 2020

Surface & Interface Analysis

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“…不同氧化还原程度 GO 的物理化学性质具有很大差异. 通常, 随 GO 含氧化学基团的增加, 其水溶液的颜色由黑色转变为棕黄色 [30] , 并且 GO 的亲水性增加 [31,32] 、电导率下降 [33] . 同时, GO 引起的生物效应也会发生变化 [31,34,35] .…”

Section: 氧化还原unclassified

“…(1)利用不同的化学氧化方法, 如 Staudenmaier 法、 Hofmann 法、Hummers 法和 Tour 法, 通过调整氧化剂的剂量、反应温度与时间, 控制 GO 的氧化程度与含氧化学基团组成 [32,35,36] . 其中, 使用氯酸钾作为氧化剂的 Staudenmaier 法和 Hofmann 法合成 GO 的 C/O 比率更高, 具有更多的含 C-O 基团(如羟基、环氧基); 使用高锰酸钾作为氧化剂的 Hummers 法和 Tour 法合成的 GO 则具有更多的含 C＝O 基团 [35] ; (2)通过还原反应, 提高 GO 的 C/O 比率, 主要的方法包括化学还原、光催化还原等 [37] .…”

Section: 氧化还原unclassified

Surface Chemical Modifications of Graphene Oxide and Interaction Mechanisms at the Nano-Bio Interface

Ma¹,

Xu²,

Liu³

2020

Acta Chim. Sinica

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Due to the unique physicochemical properties, graphene oxide has been widely applied in material chemistry, biomedical science and life science. However, here is still a great challenge to maximize the advantages of graphene oxide and overcome the deleterious effects caused by its inherent properties. For a better understanding of current status in this research field, recent progress in surface chemical modifications of graphene oxide and interaction mechanisms at the nano-bio interface has been comprehensively reviewed. First, the physicochemical properties of graphene oxide and the representative strategies of surface chemical modifications will be briefly introduced, including oxidation and reduction, carboxylation, amination, small organic molecule modification, polymer modification, peptide/protein modification, nucleic acid modification and nanoparticle modification, as well as their potential roles in mediating the graphene oxide-resulted biological effects. Following, we will present the primary interaction mechanisms of pristine and surface-modified graphene oxide at the nano-bio interface, including the formation of protein corona, cell membrane damage, membrane receptor interaction and oxidative stress. Finally, the knowledge gaps and future challenges in this research field will be detailedly discussed. Keywords graphene oxide; surface chemical modification; nano-bio interface; interaction mechanism; biological effect 1 引言 2004 年, Geim 等 [1] 首次通过机械剥离法制得单层石墨烯. 石墨烯(graphene)是一种二维纳米材料, 具有类似蜂巢的六元环平面网状结构, 厚度仅为 0.3354 nm [1] . 在石墨烯的纳米片层结构中, 碳原子发生了 sp 2 杂化, 每个碳原子通过键长为 142 nm 的 σ 键与其它三个碳原子连接, 并在与片层垂直的方向形成离域大 π 键 [2,3] . 这些结构特征赋予了石墨烯优异的机械强度、化学稳定性、高比表面积、导电和导热性能 [4][5][6][7] . 因此, 石墨烯在能源、材料、健康、环境等方面都展现了广阔的应用前景.石墨烯拥有多种衍生物, 包括氧化石墨烯(graphene oxide, GO)、还原氧化石墨烯(reduced graphene oxide, rGO)、氟化石墨烯(fluorographene)等.

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“…52,53 In addition, the GO synthesis and implementation methods are relatively ambient-operated and cost-effective. 54 There are several works displaying resistive switching behavior in GObased RRAMs because of a low-cost and CMOS-compatible material. 55−57 For example, sandwiched GO between indium tin oxide (ITO) and aluminum (Al) presents reliable RS behavior.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Graphene Oxide-Based Resistive Switching Memory by the Spray Pyrolysis Technique for Neuromorphic Computing

Moazzeni

Madvar

Hamedi

et al. 2023

ACS Appl. Nano Mater.

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Recently, resistive switching memory (RRAM) has been attractive for implementing electronic synapses in neural networks and high-density memory technology. In this paper, we report a different technique for fabricating an Al/GO/ITO RRAM device with multilevel storage capability. In this work, graphene oxide (GO) thin films have been deposited by the spray pyrolysis technique (SPT) using GO powder synthesized by chemical oxidation of graphite flakes via the modified Hummers method. The fabricated RRAM shows good switching performance between On and Off states with the best memory window of 20 and presents reliable retention characteristics of 10 4 s and 50 reproducible write−read DC cycles without degradation. The multilevel feature points out five stable multiresistant states obtained with the variation of the compliance current (I cc ) and reset voltage amplitude. The successful longterm potentiation and depression with 10 ms pulse operation allows to apply this memory in neuromorphic computing applications in addition to 11 gradual conductance levels achieved by continuous set and reset cycles. A comparison of the efficiency of SPT with that of the typical spin coating method showed a notable (87%) yield achieved by SPT. The combination of the multilevel capacity of fabricated RRAMs with SPT was exploited to suggest that GO-based RRAMs have the potential to be used as multibit GO memristors and electronic synapse devices for emerging neuromorphic chips. In addition, this work paves the way for the fabrication of solution-based, low-cost, simple and large-scale GO memristors for future electronics.

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Tunable degree of oxidation in graphene oxide: cost effective synthesis, characterization and process optimization

Cited by 14 publications

References 71 publications

pH‐dependent lubrication mechanism of graphene oxide aqueous lubricants on the strip surface during cold rolling

pH‐dependent lubrication mechanism of graphene oxide aqueous lubricants on the strip surface during cold rolling

Surface Chemical Modifications of Graphene Oxide and Interaction Mechanisms at the Nano-Bio Interface

Fabrication of Graphene Oxide-Based Resistive Switching Memory by the Spray Pyrolysis Technique for Neuromorphic Computing

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