Reduced Graphene Oxide and Porphyrin. An Interactive Affair in 2-D

Wójcik, Aleksandra; Kamat, Prashant V.

doi:10.1021/nn102185q

Cited by 207 publications

(216 citation statements)

References 79 publications

Supporting

Mentioning

201

Contrasting

Order By: Relevance

“…Molecule-like materials with accurate electronic band structure, high surface area, and stability are an alternative to the crystalline solid. [19][20][21]30,31 Graphite oxide (GO) is a polymer-like material made of carbon, oxygen, and hydrogen, having a large exposable surface area after being dispersed in water to molecular scale. 32 We demonstrated that GO can serve as a photocatalyst for H 2 evolution from water.…”

Section: Introductionmentioning

confidence: 99%

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Yeh¹,

Teng²

2012

ECS Trans.

View full text Add to dashboard Cite

Graphite oxide (GO) photocatalysts were derived from graphite oxidation. Absorption spectroscopy shows the increasing band gap of GO with the oxygen content. Electrochemical analysis along with the Mott-Schottky equation show that the conduction and valence band edge levels of GO from appropriate oxidation are suitable for both the reduction and oxidation of water. The photocatalytic activity of GO specimens with various oxygen contents was measured in methanol and AgNO 3 solutions for H 2 and O 2 evolution, respectively. The H 2 evolution was strong and stable over time whereas the O 2 evolution was negligibly small due to mutual photocatalytic reduction of the GO with upward shift of the valence band edge under illumination. The conduction band edge of GO showed negligibly change with the oxygen content. When NaIO 3 was used as a sacrificial reagent to suppress the mutual reduction mechanism under illumination, strong O 2 evolution was observed over the GO specimens. The present study demonstrates that chemical modification can easily modify the electronic properties of GO for specific photosynthetic applications. IntroductionHydrogen generation from water decomposition under light irradiation has received much attention.1-7 Photolysis of water using semiconducting photocatalyst powders is considered a prospective candidate because of the low cost in instrumentation and high interfacial contact area for reaction. [8][9][10][11][12][13][14][15][16][17] The essential requirements for an effective semiconducting photocatalyst are more negative conduction band edge and more positive valence band edge, to facilitate respectively reduction and oxidation of water. Additionally, the contact area between the catalyst and water should be large enough to execute photochemical reactions at sufficiently high gas-evolution rates. Most photocatalysts are metal-containing inorganic solids for H 2 and/or O 2 evolution from water. [18][19][20][21][22][23][24][25][26][27][28] High temperature calcination of these metal-containing photocatalysts is generally conducted for high crystallinity, 29 but it shrinks the contacting surface area with water. Molecule-like materials with accurate electronic band structure, high surface area, and stability are an alternative to the crystalline solid. [19][20][21]30,31 Graphite oxide (GO) is a polymer-like material made of carbon, oxygen, and hydrogen, having a large exposable surface area after being dispersed in water to molecular scale. 32 We demonstrated that GO can serve as a photocatalyst for H 2 evolution from water. 33 However, the conduction and valence band levels relative to those for water reduction and oxidation are yet to be explored.GO is derived from extensive oxidation of graphite and contains hydrophilic oxygen functional groups on constituting graphene sheets. [34][35][36][37][38][39][40] Therefore, GO easily disperses in aqueous solutions and exfoliates in the manner of wrinkled paper. The electronic properties of GO are related to the composition of oxygen bonding on grap...

show abstract

Section: Introductionmentioning

confidence: 99%

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Yeh¹,

Teng²

2012

ECS Trans.

View full text Add to dashboard Cite

show abstract

“…It has previously been reported to play a role as a Raman enhancement substrate because target molecules can easily form a unified orientation on it due to the flatness of the graphene surface 21,22 . Moreover, the interconnected sp 2 network of graphene gives it the ability to undergo π−π stacking with aromatic molecules 23,24 . However, most of the graphene used for preparing SERS substrate are in its reduced form from graphene oxide (GO) prepared by the oxidation of graphite.…”

Section: Introductionmentioning

confidence: 99%

Facial Synthesis of Carrageenan/Reduced Graphene Oxide/Ag Composite as Efficient SERS Platform

Zheng¹,

Wang

Zhong³

et al. 2016

Mat. Res.

View full text Add to dashboard Cite

In this paper, we reported the preparation of carrageenan/reduced graphene oxide/Ag composite (CA-RGO-Ag) by a wet chemical method at room temperature using carrageenan, graphene oxide and silver nitrate as starting materials. As-prepared composite was characterized by UV-vis spectroscopy, Raman spectroscopy, FTIR, SEM, EDX and XRD. Results showed that the reduction of graphene oxide (GO) and silver nitrate was achieved simultaneously by addition of NaBH 4 . Surface-enhanced Raman scattering study showed that the obtained composite give an intensive and enhanced Raman scattering when Rhodamine B was used as a probing molecule.

show abstract

“…8,16 Cationic porphyrin/graphene nanohybrids with PET feature generates photocurrent under white light excitation. 24 For cationic porphyrin/GO nanohybrid, whether it can get photocurrent or not is still unexplored.…”

Section: Introductionmentioning

confidence: 99%

A Photoinduced Electron Transfer System by Graphene Oxide Non-covalently Linked Porphyrin Antennae in Water

et al. 2015

View full text Add to dashboard Cite

Non-covalent interacting porphyrin/Graphene Oxide (GO) nanohybrids were formed in water and confirmed by TEM, Raman, FT-IR, XRD, UV-vis and fluorescence spectroscopy. The binding constant between porphyrin and GO is 2.38 × 10 3 L mol −1 calculated by Benesi-Hildebrand equation based on absorbance plot, which confirmed a robust porphyrin/GO nanohybrid formation. Fluorescence of porphyrin was effectively quenched by GO indicated the efficient photoinduced electron transfer (PET) from porphyrin moieties to GO, which porphyrin acts as energy absorbing and electron transferring antennae and GO serves as an efficient electron acceptor of the system. The photoelectrical response measurements of porphyrin/GO nanohybrid showed a rapid and reversible on/off photovoltage and photocurrent by the alternative white light. The PET from porphyrin to GO is energetically favorable deduced by calculating free Gibbs energy. Non-covalent porphyrin/GO nanohybrid may be used as photovoltaic conversion materials for photoelectronic applications.

show abstract

Reduced Graphene Oxide and Porphyrin. An Interactive Affair in 2-D

Cited by 207 publications

References 79 publications

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Facial Synthesis of Carrageenan/Reduced Graphene Oxide/Ag Composite as Efficient SERS Platform

A Photoinduced Electron Transfer System by Graphene Oxide Non-covalently Linked Porphyrin Antennae in Water

Contact Info

Product

Resources

About