Band gap engineering of BiOI via oxygen vacancies induced by graphene for improved photocatalysis

2019 ◽  
Vol 43 (3) ◽  
pp. 1523-1530 ◽  
Author(s):  
Xuejun Ren ◽  
Jingwen Yao ◽  
Lei Cai ◽  
Jibiao Li ◽  
Xingzhong Cao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Band Gap ◽  
Reduced Graphene Oxide ◽  
Oxygen Vacancies ◽  
Reduction Method ◽  
Thermal Reduction ◽  
Band Gap Engineering ◽  
Bismuth Iodide ◽  
Reduced Graphene

A reduced graphene oxide–bismuth iodide oxide (rGO–BiOI) composite was prepared by a thermal reduction method.

Reduced Graphene Oxide Paper: Fabrication by a Green Thermal Reduction Method and Preliminary Study of its In Vitro Cytotoxicity

2017 ◽  
Vol 45 ◽  
pp. 199-207 ◽  
Author(s):  
Xin Wang ◽  
Peng Li ◽  
Claudia Luedecke ◽  
Qiang Zhang ◽  
Zan Wang ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Mammalian Cells ◽  
Reduction Method ◽  
Heating Temperature ◽  
Synthesis Method ◽  
Thermal Reduction ◽  
Graphene Films ◽  
Reduced Graphene

Graphene films have been intensively explored because of their unique mechanical and physicochemical properties for potential applications in field of tissue engineering and implants. However, for biomedical applications, it is necessary to fully understand the toxicity and biocompatibility of the prepared graphene films since different synthesis method might lead to different biological properties. Here we report a step-by-step thermal reduction method of preparing reduced graphene oxide (rGO) film directly on various substrates at low heating temperature (below about 200 °C) without requiring any chemical reduction agent like hydrazine or other reductants (therefore we call it green method). Slowly heating GO hydrosol that was coated on the surface of a glass cell-culture dish or inside of a polypropylene tube from room temperature to 60, 100, and 160 °C for 12 h, respectively, a shiny and flat surface without crumpled structure or tiny pores was formed. We peeled it off from the substrate to explore its cytotoxicity. The results exhibited that the rGO film was biocompatible with Cal-72 cell but against Escherichia coli bacteria. Our work confirmed that rGO film produced by the green reduction method is cytocompatible with mammalian cells, which makes this rGO film a promising material for tissue engineering scaffold or as a surface-modification coating of an implant.

Facile synthesis of thermally reduced graphene oxide-sepiolite nanohybrid via intercalation and thermal reduction method

2017 ◽  
Vol 135 ◽  
pp. 510-515 ◽  
Author(s):  
M.R. Vengatesan ◽  
S. Singh ◽  
S. Stephen ◽  
K. Prasanna ◽  
C.W. Lee ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reduction Method ◽  
Thermal Reduction ◽  
Facile Synthesis ◽  
Reduced Graphene

scholarly journals Preparation of a graphene/silver hybrid membrane as a new nanofiltration membrane

RSC Advances ◽  
2017 ◽  
Vol 7 (77) ◽  
pp. 49159-49165 ◽  
Author(s):  
Gui-fei Liu ◽  
Lin-jun Huang ◽  
Yan-xin Wang ◽  
Jian-guo Tang ◽  
Yao Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Composite Membrane ◽  
Reduction Method ◽  
Water Flux ◽  
Thermal Reduction ◽  
Hybrid Membrane ◽  
Nanofiltration Membrane ◽  
Reduced Graphene

In this study, we describe the preparation, characterization, water flux and rejection performance of a composite membrane formed from reduced graphene oxide (RGO) and silver nanoparticles (AgNP) via a rapid thermal reduction method.

Fabrication and biocompatibility of reduced graphene oxide/poly(vinylidene fluoride) composite membranes

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 99841-99847 ◽  
Author(s):  
Supeng Pei ◽  
Fei Ai ◽  
Song Qu
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reduction Method ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Thermal Reduction ◽  
Reduced Graphene ◽  
Poly Vinylidene Fluoride ◽  
Good Biocompatibility

RGO/PVDF composite membranes with different RGO loadings were prepared by a convenient in situ thermal reduction method and the structural study reveals the good dispersion of RGO in the PVDF, moreover, RGO/PVDF membranes show good biocompatibility.

Fabrication of reduced graphene oxide/metal (Cu, Ni, Co) nanoparticle hybrid composites via a facile thermal reduction method

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 49973-49978 ◽  
Author(s):  
Xiubing Huang ◽  
Guixia Zhao ◽  
Xiangke Wang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reduction Method ◽  
Hybrid Composites ◽  
Thermal Reduction ◽  
Reduced Graphene

Reduced graphene oxide/metal (e.g., Cu, Ni, Co) nanoparticle hybrid composites were prepared via a facile thermal reduction method at 500 °C under flowing argon without any usage of external reductive gases.

Thermal reduction to control the spacing in graphene oxide membranes: effect on ion diffusion and electrical conduction

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 70012-70017 ◽  
Author(s):  
A. Alhadhrami ◽  
S. Salgado ◽  
V. Maheshwari
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrical Conduction ◽  
Thermal Reduction ◽  
Electrochemical Characteristics ◽  
Ion Diffusion ◽  
Layer Spacing ◽  
Reduced Graphene ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

Inter-layer spacing in reduced graphene-oxide membranes which modulates their ion-diffusion electrical and electrochemical characteristics is controlled by temperature of thermal reduction.

The Role of Reduced Graphene Oxide Concentration as Ablated Material on Optical Properties of Graphene Quantum Dots

2019 ◽  
Vol 948 ◽  
pp. 267-273 ◽  
Author(s):  
Fiqhri Heda Murdaka ◽  
Ahmad Kusumaatmaja ◽  
Isnaeni ◽  
Iman Santoso
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Oxide ◽  
Band Gap ◽  
Reduced Graphene Oxide ◽  
Optical Band Gap ◽  
Graphene Quantum Dots ◽  
Absorption Peak ◽  
Oxygen Defect ◽  
Reduced Graphene

We report the synthesize of Graphene Quantum Dots (GQDs) using ablation method with reduced Graphene Oxide (rGO) solution as a starting material. We have varied the concentration of rGO as following: 0.5, 2, 5 mg/ml and then have ablated them using 800 nm Ti-Sapphire femtosecond laser to obtain GQDs. From the UV-Vis data, we observed that the more concentration of rGO is being ablated, the more secondary absorption peak at 255.1 nm appeared. This secondary absorption peak is a characteristic of n-π* bonding due to the presence of oxygen defect which occurs as a result of the interaction between the laser and the water in rGO solution. We conclude that the population of oxigen defect in GQDs is increasing, following the increase of rGO concentration and could alter the optical properties of GQD. On the other hand, using Tauc’s plot, we confirm that the increase of rGO concentration as the ablated material does not alter GQDs optical band gap. However, it will slightly reduce both, direct and indirect Oxygen defect related optical band gap.

scholarly journals Synthesis and characterization of sulfophenyl-functionalized reduced graphene oxide sheets

RSC Advances ◽  
2017 ◽  
Vol 7 (44) ◽  
pp. 27224-27234 ◽  
Author(s):  
Benjamin Diby Ossonon ◽  
Daniel Bélanger
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Thermal Reduction ◽  
Synthesis And Characterization ◽  
Reduced Graphene ◽  
Graphene Oxide Sheets

We report modification of graphene oxide by thermal reduction to obtain reduced graphene oxide and subsequent functionalization with sulfophenyl groups to obtain SRGO as well as the characterization of these materials by TGA-MS.

The effect of the thermal reduction temperature on the structure and sorption capacity of reduced graphene oxide materials

2016 ◽  
Vol 361 ◽  
pp. 213-220 ◽  
Author(s):  
Alexandr V. Dolbin ◽  
Maria V. Khlistyuck ◽  
Valentin B. Esel'son ◽  
Viktor G. Gavrilko ◽  
Nikolay A. Vinnikov ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Sorption Capacity ◽  
Thermal Reduction ◽  
Oxide Materials ◽  
Reduction Temperature ◽  
Reduced Graphene
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