Oxalic acid assisted expansion–reduction exfoliation of graphene oxide into graphene nanosheets

Kong, Ying‐Chao; Wu, Pei-Rong; Jiwei, Dong; Ding, Hanfeng; Liu, Zan; Cheng, Zhi‐Lin

doi:10.1016/j.matlet.2018.08.028

Cited by 20 publications

(13 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the Raman spectra, the as-prepared samples show two prominent peaks at around 1350 and 1590 cm −1 , which correspond to the D band (sp 3 -hybridized carbon) related to structural defects and partially disordered structures, and the G band related to in-plane vibrations of sp 2 -hybridized carbon ( Figure 4C). 35,43,44 Furthermore, the weak 2D band has also been observed around at 2920 cm −1 , which is considered as the character of graphene. 27,43 The G band and 2D band are found to be sensitive to the number of layers of graphene; according to the ratios of I G /I 2D , all our samples show the multilayer structure.…”

Section: Figurementioning

confidence: 98%

“…35,43,44 Furthermore, the weak 2D band has also been observed around at 2920 cm −1 , which is considered as the character of graphene. 27,43 The G band and 2D band are found to be sensitive to the number of layers of graphene; according to the ratios of I G /I 2D , all our samples show the multilayer structure. 27 The intensity ratios of D band to G band (I D / I G ) are found to be about 0.91, 0.93, 0.95, 0.95, 0.94, and 0.96 for GO, rGOF, and C-rGOF12-T (140, 150, 160, and 170), respectively.…”

Section: Figurementioning

confidence: 98%

“…Furthermore, the relative content of the oxygencontaining groups initially decreases but increases later with the increment of the OA concentration and hydrothermal temperatures. 13,34,43 However, the intensities related to the peaks of oxygen-containing groups become weak after being treated under hydrothermal condition; the additional peak at 291.2 eV is assigned to satellite peak (pp*) of carbon caused by the π-π* transition of the aromatic cores (Figures 5C-5F and S5). 13,34,43 However, the intensities related to the peaks of oxygen-containing groups become weak after being treated under hydrothermal condition; the additional peak at 291.2 eV is assigned to satellite peak (pp*) of carbon caused by the π-π* transition of the aromatic cores (Figures 5C-5F and S5).…”

Section: Characterization Of the Samplesmentioning

confidence: 99%

“…The high-resolution C1s XPS of GO can be divided into five peaks located at 283.9, 284.6, 286.0, 287.5, and 288.9 eV ( Figure 5B), which correspond to C═C, C-C, C-O, C═O, and COOR groups. 13,34,43 However, the intensities related to the peaks of oxygen-containing groups become weak after being treated under hydrothermal condition; the additional peak at 291.2 eV is assigned to satellite peak (pp*) of carbon caused by the π-π* transition of the aromatic cores ( Figures 5C-5F and S5). 34 It is interesting to find that the ratios of C═C/C-C for the samples also increase firstly and decrease later with the increment of OA concentrations and treating temperatures.…”

Section: Figurementioning

confidence: 99%

See 3 more Smart Citations

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

Gao

Han

et al. 2019

Int J Energy Res

View full text Add to dashboard Cite

Summary By using oxalic acid (OA) as template and reducer, a novel approach is developed to prepare reduced graphene oxide films with capsular pores (C‐rGOFs) under a hydrothermal condition. The effect of preparation conditions including concentrations of OA and reaction temperatures on the films' structure and capacitive performances has been systematically investigated. The optimal C‐rGOF shows uniform capsule‐like morphology and exhibits a density of 1.18 g cm−3. Tested by using a two‐electrode system, the optimal film shows gravimetric specific capacitance of about 234.9 F g−1 and volumetric specific capacitance of 277.2 F cm−3. Additionally, the optimal film which shows good rate capability can retain 63.9% of initial capacitance at high scan rate of 1.0 V s−1, which is much higher than that of the controlling reduced graphene oxide film (rGOF, 180.5 F g−1, 373.6 F cm−3 and retain only 45.0% of its initial capacitance at 1.0 V s−1). The cells assembled by the optimal C‐rGOF exhibit maximum energy density of 7.5 Wh kg−1, power density of 16.9 kW kg−1, and excellent cycling stability with 91.2% capacitance retention after 21 000 cycles. It is believed that this method can be developed as a useful strategy to prepare rGO‐based materials for energy storage applications.

show abstract

Section: Figurementioning

confidence: 98%

Section: Figurementioning

confidence: 98%

Section: Characterization Of the Samplesmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

Gao

Han

et al. 2019

Int J Energy Res

View full text Add to dashboard Cite

show abstract

“…We prepared GO by the modified hummer's method 11,12 and subsequently accessed graphene nanosheets by expansion-exfoliation and reduction of GO. 13 Firstly,10 mL of 0.5 mol/L H 2 C 2 O 4 solution was drop wisely added into the crucible containing 2 g of GO powder until it was completely impregnated. After impregnation, the sample in was dried in a vacuum oven at 120 C for 2 hours, and the same impregnation step was repeated three times.…”

Section: Preparation Of Expansion-exfoliated Go Into Graphene Nanosmentioning

confidence: 99%

Preparation and tribological properties of eco‐friendly as‐exfoliated graphene in grease

Kong¹,

Liu²,

Cheng

2020

Lubrication Science

Self Cite

View full text Add to dashboard Cite

The exfoliation for few layers of graphene was prospective for scale output due to low cost and processable advantages. However, the massive production had some obstacles such as high pollution with organics and harmful elements and use of rare metal. Herein, we developed a facile and eco-friendly expansionreduction exfoliation method to prepare graphene from graphene oxide (GO) with aid of oxalic acid(H 2 C 2 O 4). The as-exfoliated graphene nanosheets possessed a 10-layered thickness and large lateral size of approximately 0.5 μm. As a prospective application, the as-exfoliated graphene nanosheets were conducted as additive in the grease for the sake of antifriction and antiwear. The results showed that the friction reduction and wear resistant properties were improved by 35.8% and 32.8%, respectively. The friction reducing mechanism of graphene in grease was proposed due to forming a protective film.

show abstract

Electrochemical Sensors and Biosensors Based on Graphene Functionalized with Metal Oxide Nanostructures for Healthcare Applications

et al. 2019

View full text Add to dashboard Cite

Graphene has attracted wide consideration in recent years to the assembly of sensitive sensors and biosensors due to its unique and remarkable physical and electrochemical properties. Moreover, graphene, as an essential two‐dimensional carbon material with remarkably high quartz and electronic superiority, has also received significant research attention. This review presents the different synthesis techniques of graphene; graphene functionalized based electrochemical sensors and biosensors for various health care appellations. Further, were discussed on the basis of enhanced catalytic activity, improved detection limit in conjunction with sensitivity, and selectivity. Synergistic action of graphene and metal oxide nanostructure has contributed towards high activity as a biosensing material. The results with different sensors and biosensors for the detection of significant biomarkers such as protein sensor, electrochemical immune sensor, phytochrome sensor, cholesterol biosensor glucose, hydrogen peroxide, and nicotinamide adenine dinucleotide detection sensor etc., and highlighted the use of graphene and functionalized graphene in different sensing platforms. Finally, the challenges related to less aggregated graphene‐based electrochemical sensors and biosensors as well as future research directions are discussed.

show abstract

Oxalic acid assisted expansion–reduction exfoliation of graphene oxide into graphene nanosheets

Cited by 20 publications

References 17 publications

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

Preparation and tribological properties of eco‐friendly as‐exfoliated graphene in grease

Electrochemical Sensors and Biosensors Based on Graphene Functionalized with Metal Oxide Nanostructures for Healthcare Applications

Contact Info

Product

Resources

About