Enhanced UV detection by transparent graphene oxide/ZnO composite thin films

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61661-61672 ◽  
Author(s):  
R. Paul ◽  
R. N. Gayen ◽  
S. Biswas ◽  
S. Venkataprasad Bhat ◽  
R. Bhunia
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Carrier Transport ◽  
Chemical Method ◽  
Composite Films ◽  
Uv Detection ◽  
Detection Capability ◽  
Electron Hole ◽  
Simple Chemical ◽  
Hole Recombination

Highly transparent graphene oxide–ZnO composite films synthesized by simple chemical method inhibit electron–hole recombination, modulate carrier transport and enhance UV detection capability.

A simple chemical method for deposition of electrochromic potassium manganese oxide hydrate thin films

2012 ◽  
Vol 47 (9) ◽  
pp. 2239-2244 ◽  
Author(s):  
Metodija Najdoski ◽  
Violeta Koleva ◽  
Sani Demiri ◽  
Sasho Stojkovikj
Keyword(s):  
Thin Films ◽  
Manganese Oxide ◽  
Chemical Method ◽  
Oxide Hydrate ◽  
Simple Chemical

Synthesis of TiO2-Reduced Graphene Oxide Nanocomposites Offering Highly Enhanced Photocatalytic Activity

2019 ◽  
Vol 19 (11) ◽  
pp. 7089-7096 ◽  
Author(s):  
Wufa Li ◽  
Xiaohong Yang ◽  
Haitao Fu ◽  
Xizhong An ◽  
Haiyang Zhao
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Environmental Remediation ◽  
Hydrothermal Reaction ◽  
Photogenerated Electron ◽  
Electron Hole ◽  
Reduced Graphene ◽  
Vis Spectroscopy ◽  
Hole Recombination

Photogenerated electron–hole recombination significantly restricts the catalytic efficiency of titanium dioxide (TiO2). Various approaches have been developed to overcome this problem, yet it remains challenging. Recently, graphene modification of TiO2 has been considered as an effective alternative to prevent electron–hole recombination and consequently enhance the photocatalytic performance of TiO2. This study reports an efficient but simple hydrothermal method utilizing titanium (IV) butoxide (TBT) and graphene oxide (GO) to prepare TiO2-reduced graphene oxide (RGO) nanocomposites under mild reaction conditions. This method possesses several advantageous features, including no requirement of high temperature for TiO2 crystallization and a one-step hydrothermal reaction for mild reduction of GO without a reducing agent, which consequently makes the production of TiO2-RGO nanocomposites possible in a green and an efficient synthetic route. Moreover, the as-synthesized nanocomposites were characterized by numerous advanced techniques (SEM, TEM, BET, XRD, XPS, and UV-vis spectroscopy). In particular, the photocatalytic activities of the synthesized TiO2-RGO nanocomposites were evaluated by degrading the organic molecules (methylene blue, MB), and it was found that the photocatalytic activity of TiO2-RGO nanocomposites is ~4.5 times higher compared to that of pure TiO2. These findings would be useful for designing reduced graphene oxide-metal oxide hybrids with desirable functionalities in various applications for energy storage devices and environmental remediation.

Influence of vanadium concentration and temperature on the preparation of electrochromic thin films of ammonium intercalated vanadium(v) oxide xerogel nanoribbons

2014 ◽  
Vol 43 (33) ◽  
pp. 12536-12545 ◽  
Author(s):  
Metodija Najdoski ◽  
Violeta Koleva ◽  
Aksu Samet
Keyword(s):  
Thin Films ◽  
Chemical Method ◽  
Vanadium Concentration ◽  
Simple Chemical

A new and simple chemical method for deposition of thin films of ammonium intercalated V2O5·nH2O xerogels has been designed.

scholarly journals Graphene Oxide Reinforced Polycarbonate Nanocomposite Films with Antibacterial Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
R. Mahendran ◽  
D. Sridharan ◽  
K. Santhakumar ◽  
T. A. Selvakumar ◽  
P. Rajasekar ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Low Cost ◽  
Thermal Studies ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Nanocomposite Films ◽  
Matrix Microstructure ◽  
Phase Inversion Technique

The incorporation of carbonaceous nanofillers into polymers can result in significant materials with improved physicochemical properties and novel composite functionalities. In this study, we have fabricated antibacterial, lightweight, transparent, and flexible graphene oxide (GO) reinforced polycarbonate thin films by a facile and low-cost methodology. Solution blending is employed to get a homogeneous mixture of PC-GO composites at various loading of GO, and the thin films are prepared by dry-wet phase inversion technique. Thermal studies and micrographs of the films revealed the incorporation of GO in PC matrix. Microstructure of the thin films showed the homogeneous dispersion of GO at micro- and nanoscales; however, at higher loading of GO (0.7%), significant agglomeration is observed. More importantly, PC-GO composite films exhibited excellent antibacterial activities against E. coli and S. aureus, owing to the antibacterial nature of GO nanoparticles.

scholarly journals Creation of Photoactive Inorganic/Organic Interfaces Using Occlusion Electrodeposition Process of Inorganic Nanoparticles During Electropolymerization of 2,2′:5′,2′′-Terthiophene

2016 ◽  
Vol 8 (2) ◽  
pp. 1
Author(s):  
Kasem K. Kasem ◽  
Christopher Santuzzi ◽  
Nick Daanen ◽  
Kortany Baker
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electrochemical Techniques ◽  
Organic Thin Films ◽  
Inorganic Nanoparticles ◽  
Energy Band Gap ◽  
Electron Hole ◽  
Electrodeposition Process ◽  
Organic Interfaces ◽  
Hole Recombination

<p>Photoactive (IOI) inorganic/organic interface assemblies were prepared using an occlusion electrodeposition method. Poly-2,2′:5′,2′′-Terthiophene (PTTh) were the organic thin films that occluded each of CdS, TiO<sub>2</sub>, and Zn-doped WO<sub>3</sub> nanoparticles.<strong> </strong>The energy band gap structures were investigated using spectroscopic and electrochemical techniques.<strong> </strong>The obtained assemblies were investigated in aqueous solutions under both dark and illuminated conditions. The results were compared with the behavior of PTTh thin film. Oxygen played an important role in minimizing electron/hole recombination as was evident by observed very low photocurrent when oxygen was removed by nitrogen purge. Results show that PTTh/CdS gave the greatest photocurrent, followed by PTTh/Zn-WO<sub>3</sub> and PTTh/TiO<sub>2</sub>.</p>

Ultrastrong, Chemically Resistant Reduced Graphene Oxide-based Multilayer Thin Films with Damage Detection Capability

2016 ◽  
Vol 8 (9) ◽  
pp. 6229-6235 ◽  
Author(s):  
Tyler Guin ◽  
Bart Stevens ◽  
Michelle Krecker ◽  
John D’Angelo ◽  
Mohammad Humood ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Damage Detection ◽  
Reduced Graphene Oxide ◽  
Multilayer Thin Films ◽  
Detection Capability ◽  
Reduced Graphene

Photoluminescence Investigation of Pb(Zr,Ti)O3 Thin Films

1991 ◽  
Vol 243 ◽  
Author(s):  
Peter Zurcher ◽  
Raymond P. Jones ◽  
Yongchen Sun ◽  
R.L. Cone
Keyword(s):  
Thin Films ◽  
Deep Trap ◽  
Electrical Performance ◽  
Electron Hole ◽  
Pzt Thin Films ◽  
Pzt Films ◽  
Donor Acceptor ◽  
Defect Densities ◽  
La Doped ◽  
Hole Recombination

AbstractPhotoluminescence (PL) excited at 1.7K with a N2-Laser (3.679eV) was used to investigate defect related electron-hole recombination transitions in ferroelectric PZT thin films. The interaction of doping, heat treatment, and hydrogen with the defect related PL spectrum has been studied. Donor/acceptor related transitions between 3.0 and 3.5eV and deep trap transitions between 2.0 and 2.6eV have been found. Certain heat treatments produce high densities of deep trap transitions in Pb(Zr0.48Ti0.52)03 thin films but not in 6% La doped PZT; different treatments are neccessary to produce similar deep trap transitions in the doped films. Hydrogen anneals eliminate the strongest deep trap transition at 2.15eV in both undoped and La-doped PZT films; however the donor/acceptor transitions are affected differently. Correlation with electrical properties seems to indicate the expected result: smaller defect densities are associated with better electrical performance.

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