Modulating Optical Properties of Graphene Oxide: Role of Prominent Functional Groups

ACS Nano ◽  
2011 ◽  
Vol 5 (9) ◽  
pp. 7640-7647 ◽  
Author(s):  
Priya Johari ◽  
Vivek B. Shenoy
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Functional Groups

The role of functional groups on graphene oxide in epoxy nanocomposites

Polymer ◽  
2013 ◽  
Vol 54 (21) ◽  
pp. 5821-5829 ◽  
Author(s):  
Zheng Li ◽  
Robert J. Young ◽  
Rongguo Wang ◽  
Fan Yang ◽  
Lifeng Hao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Epoxy Nanocomposites

Role of oxygen vacancies in vanadium oxide and oxygen functional groups in graphene oxide for room temperature CO2 gas sensors

2019 ◽  
Vol 294 ◽  
pp. 17-24 ◽  
Author(s):  
Shrouk E. Zaki ◽  
Mohamed A. Basyooni ◽  
Mohamed Shaban ◽  
Mohamed Rabia ◽  
Yasin Ramazan Eker ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Vanadium Oxide ◽  
Functional Groups ◽  
Gas Sensors ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Co2 Gas ◽  
Oxygen Functional Groups

Role of oxygen functional groups in graphene oxide for reversible room-temperature NO2 sensing

Carbon ◽  
2015 ◽  
Vol 91 ◽  
pp. 178-187 ◽  
Author(s):  
You Rim Choi ◽  
Young-Gui Yoon ◽  
Kyoung Soon Choi ◽  
Jong Hun Kang ◽  
Young-Seok Shim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Room Temperature ◽  
Oxygen Functional Groups

Selective engineering of oxygen-containing functional groups using the alkyl ligand oleylamine for revealing the luminescence mechanism of graphene oxide quantum dots

Nanoscale ◽  
2017 ◽  
Vol 9 (47) ◽  
pp. 18635-18643 ◽  
Author(s):  
Min-Ho Jang ◽  
Hyunseung Yang ◽  
Yun Hee Chang ◽  
Hyun-Chul Park ◽  
Hyeonjung Park ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Light Emission ◽  
Epoxide Group ◽  
Graphene Oxide Quantum Dots

The role of the epoxide group in light emission of GOQDs is demonstrated by selective passivation using the alkyl ligand oleylamine.

scholarly journals Role of Functional Groups in the Monomer Molecule on the Radical Polymerization in the Presence of Graphene Oxide. Polymerization of Hydroxyethyl Acrylate under Isothermal and Non-Isothermal Conditions

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 345
Author(s):  
Ioannis S. Tsagkalias ◽  
Dimitrios S. Achilias
Keyword(s):  
Activation Energy ◽  
Graphene Oxide ◽  
Hydrogen Bonds ◽  
Radical Polymerization ◽  
Functional Groups ◽  
Reaction Rate ◽  
Monomer Molecule ◽  
Polymer Molecules ◽  
Isothermal Conditions

Functional groups in a monomer molecule usually play an important role during polymerization by enhancing or decreasing the reaction rate due to the possible formation of side bonds. The situation becomes more complicated when polymerization takes place in the presence of graphene oxide since it also includes functional groups in its surface. Aiming to explore the role of functional groups on polymerization rate, the in situ bulk radical polymerization of hydroxyethyl acrylate (HEA) in the presence or not of graphene oxide was investigated. Differential scanning calorimetry was used to continuously record the reaction rate under both isothermal and non-isothermal conditions. Simple kinetic models and isoconversional analysis were used to estimate the variation of the overall activation energy with the monomer conversion. It was found that during isothermal experiments, the formation of both inter- and intra-chain hydrogen bonds between the monomer and polymer molecules results in slower polymerization of neat HEA with higher overall activation energy compared to that estimated in the presence of GO. The presence of GO results in a dissociation of hydrogen bonds between monomer and polymer molecules and, thus, to higher reaction rates. Isoconversional methods employed during non-isothermal experiments revealed that the presence of GO results in higher overall activation energy due to the reaction of more functional groups on the surface of GO with the hydroxyl and carbonyl groups of the monomer and polymer molecules, together with the reaction of primary initiator radicals with the surface hydroxyl groups in GO.

The role of ozone in the ozonation process of graphene oxide: oxidation or decomposition?

RSC Advances ◽  
2014 ◽  
Vol 4 (102) ◽  
pp. 58325-58328 ◽  
Author(s):  
Feng Yang ◽  
Meilian Zhao ◽  
Zhen Wang ◽  
Hongyun Ji ◽  
Baozhan Zheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Decomposition Stage ◽  
Ozonation Time ◽  
Oxidation Stage ◽  
Ozonation Process

We took ozonation as an effective method to re-oxidize graphene oxide (GO) and discussed the behaviour of ozone in ozonation process of graphene oxide according to the changes of optical properties, compositions and structure. The results indicated that the ozonation process may involve the oxidation stage and decomposition stage. The fluorescence shifted blue with prolonging ozonation time.

scholarly journals Role of oxygen functional groups in reduced graphene oxide for lubrication

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Bhavana Gupta ◽  
Niranjan Kumar ◽  
Kalpataru Panda ◽  
Vigneshwaran Kanan ◽  
Shailesh Joshi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Functional Groups ◽  
Oxygen Functional Groups ◽  
Reduced Graphene

Comparative effects of graphene and graphene oxide on copper toxicity to Daphnia magna: Role of surface oxygenic functional groups

2018 ◽  
Vol 236 ◽  
pp. 962-970 ◽  
Author(s):  
Yingying Liu ◽  
Wenhong Fan ◽  
Zhizhen Xu ◽  
Weihua Peng ◽  
Shenglian Luo
Keyword(s):  
Graphene Oxide ◽  
Daphnia Magna ◽  
Functional Groups ◽  
Copper Toxicity
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