Highly efficient organic ultraviolet photodetectors based on excellent Cu (I) complexes

2013 ◽  
Vol 21 (3) ◽  
Author(s):  
C. Liu ◽  
B. Su ◽  
M. Liu ◽  
X. Zhang ◽  
L. Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Uv Light ◽  
High Response ◽  
Working Mechanism ◽  
Photoluminescence Quenching ◽  
Uv Light Irradiation ◽  
Donor And Acceptor ◽  
Electron Donor And Acceptor ◽  
Ultraviolet Photodetectors ◽  
Photoinduced Charge

AbstractWe demonstrate high response organic ultraviolet photodetectors using 4,4′,4″-tris[3-methyl-pheny(phenyl)amino]tri-phenylamine (m-MTDATA) and two novel Cu(I) complexes, [Cu(DPEphos)(PyPhen)]BF4 (CuDP)(DPEphos = Bis [2-(diphenylphosphino)phenyl]ether, PyPhen = pyrazino[2,3-f][1,10]phenanthroline) and [Cu(DPEbenz)(PyPhen)]BF4 (CuBP) (DPEbenz = 1,2-bis(diphenylphosphino)benzene) to act as the electron donor and acceptor, respectively. Strong photoluminescence quenching of m-MTDATA by Cu(I) complexes is observed manifesting the efficient photoinduced charge transfer that occurs between m-MTDATA and Cu(I) complexes. The optimized photodetector based on CuBP exhibits a maximum response of 276 mA/W at −12 V under an illumination of 365 nm UV light irradiation with an intensity of 1.75 mW/cm2. The high response is attributed to feasible energy level match, efficient electron transfer from m-MTDATA to CuBP and skillful device design. More detailed working mechanism of harvesting high performance is also discussed.

Smart microcapsules for precise delivery systems

2018 ◽  
Vol 11 (05) ◽  
pp. 1850041 ◽  
Author(s):  
Anna Trojanowska ◽  
Valentina Marturano ◽  
Nuno A. G. Bandeira ◽  
Marta Giamberini ◽  
Bartosz Tylkowski
Keyword(s):  
High Performance ◽  
Main Chain ◽  
Interfacial Polymerization ◽  
Uv Light ◽  
Active Material ◽  
Morphological Variations ◽  
Uv Light Irradiation ◽  
Oil In Water ◽  
Chemical Companies ◽  
Polymerization Method

Photosensitive microcapsules are important targets for medical, pharmaceutical, agriculture, consumer goods and chemical companies. In this study, we report the development of UV-sensitive capsules containing vanillin as a model encapsulated active material. Polyamide microcapsule shells containing azobenzene moieties in the main chain of the polymer were fabricated by oil-in-water interfacial polymerization method. Triggered perfume release and morphological variations of the microcapsule shell during UV light irradiation were observed by means of high-performance liquid chromatography (HPLC) and optical microscopy.

scholarly journals Photocatalytic oxidation of nitrite ion over carbon nitride

2018 ◽  
Vol 14 (1-2) ◽  
pp. 174-178 ◽  
Author(s):  
Siti Maryam Jasman ◽  
Hendrik Oktendy Lintang ◽  
Siew Ling Lee ◽  
Leny Yuliati
Keyword(s):  
High Performance ◽  
Photocatalytic Oxidation ◽  
Carbon Nitride ◽  
Uv Light ◽  
Nitrogen Adsorption ◽  
Thermal Polymerization ◽  
Light Irradiation ◽  
Polymerization Process ◽  
Nitrite Ion ◽  
Uv Light Irradiation

Nitrite ion (NO2-) is a toxic inorganic contaminant, which is widely used in industry and agriculture as a food preservative and a fertilizing agent. One of the methods to reduce the toxicity of the NO2- is by oxidizing it into less hazardous compounds, such as nitrate ion (NO3-). In this study, we demonstrated that a simple and green photocatalytic process can be employed to oxidize the NO2- to NO3- over a metal free-carbon nitride photocatalyst under ultraviolet (UV) light irradiation. The carbon nitride was synthesized via pyrolysis of urea precursor by a thermal polymerization process at 823 K for 4 hours. The prepared carbon nitride was then characterized by using X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM), diffuse reflectance UV-visible (DR UV-vis), fluorescence, and Fourier transform infrared (FTIR) spectrophotometers, as well as nitrogen  adsorption-desorption isotherm analyzer. All the characterization results supported the successful synthesis of the carbon nitride. The carbon nitride was then used as the photocatalyst for oxidation of NO2- to NO3- under UV light irradiation for 3 h. The decrease of the NO2- and the formation of the NO3- were analyzed by using a high performance liquid chromatography (HPLC) equipped with Hypersil GoldTM PFP column. The mobile phase used was a mixture of methanol (MeOH) and water (H2O) with the ratio of MeOH:H2O was 30:70. The addition of orthophosphoric acid was required to set the pH at 2.5. The flow rate was fixed at 0.8 ml min-1 and the monitored wavelength was 220 nm. It was revealed that carbon nitride could oxidize NO2- to NO3- with a moderate conversion of 15%. Fluorescence quenching showed that there were good interactions between the emission sites of carbon nitride and the NO2- molecules. The good interactions would be one driving force for the carbon nitride to act as a good photocatalyst to oxidize the NO2- to NO3-. The oxidation pathway by the photogenerated species was also proposed.

Study of Photocatalytic Activity of TiO2 Nanotube Derived from Different Anodized Parameters

2012 ◽  
Vol 488-489 ◽  
pp. 1519-1524 ◽  
Author(s):  
Kittirong Srimuangmak ◽  
Sutham Niyomwas
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
High Performance ◽  
Uv Light ◽  
Photocatalytic Reaction ◽  
Uv Light Irradiation ◽  
Anodization Process ◽  
Temperature Time ◽  
Anodization Method

In this study titanium dioxide nanotube (TNT) were prepared by anodization method. The effects of the temperature, time and voltage on the anodization process were investigated in detail. Photocatalytic activity of the TNT films was evaluated in terms of the degradation of methylene blue in aqueous solution under UV light irradiation. The results showed that the optimization of temperature, voltage and time on anodization process were 45oC, 20 V and 1 day, respectively. Consequently, these results indicate that the optimization of anodization process is critical to achieve the high performance of photocatalytic reaction.

Photoelectrocatalytic degradation of Rhodamine B using graphene and titanium dioxide composite catalyst

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744098
Author(s):  
Yu Zhao ◽  
Wen-Han Du ◽  
Lei Chen ◽  
Jin Xiao ◽  
Chao Xiong ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Rhodamine B ◽  
High Performance ◽  
Separation Efficiency ◽  
Uv Light ◽  
Synthesis Method ◽  
Light Irradiation ◽  
Composite Catalyst ◽  
Uv Light Irradiation ◽  
Photoelectrocatalytic Degradation

Graphene and titanium dioxide (TiO2) composite catalyst has been synthesized by hydrothermal synthesis method, and used for the degradation of Rhodamine B (Rh.B) in water. The photoelectrocatalytic activity of this composite was evaluated by decomposing of Rh.B in water under visible or UV light irradiation. The degradation results indicated that the photoelectrocatalytic performance of this composite catalyst was greatly enhanced due to the improved adsorption performance and separation efficiency of photo-generated carriers possibly. The composite with graphene content of 10 wt.% exhibited superior activity under UV light irradiation. After 30 min of reaction, the photoelectrocatalytic degradation ratio of Rh.B was about 96% when pH [Formula: see text] 6–7. The results of this work provide a good method for the treatment of organic wastewater with high performance.

scholarly journals Benzothiazole heterogeneous photodegradation in nano α-Fe 2 O 3 /oxalate system under UV light irradiation

2018 ◽  
Vol 5 (6) ◽  
pp. 180322 ◽  
Author(s):  
Xiangyun Han ◽  
Xi Zhang ◽  
Lei Zhang ◽  
Mei Pan ◽  
Jinlong Yan
Keyword(s):  
Liquid Chromatography ◽  
Oxalic Acid ◽  
High Performance ◽  
Uv Light ◽  
Transformation Products ◽  
Light Irradiation ◽  
Order Kinetic ◽  
Uv Light Irradiation ◽  
Order Kinetic Model ◽  
Set Up

The photodegradation of benzothiazole (BTH) in wastewater with the coexistence of iron oxides and oxalic acid under UV light irradiation was investigated. Results revealed that an effective heterogeneous photo-Fenton-like system could be set up for BTH abatement in wastewater under UV irradiation without additional H 2 O 2 , and 88.1% BTH was removed with the addition of 2.0 mmol l −1 oxalic acid and 0.2 g l −1 α-Fe 2 O 3 using a 500 W high-pressure mercury lamp (365 nm). The degradation of BTH in the photo-Fenton-like system followed the first-order kinetic model. The photoproduction of hydroxyl radicals (·OH) in different systems was determined by high-performance liquid chromatography. Identification of transformation products by using liquid chromatography coupled with high resolution tandem mass spectrometry provided information about six transformation products formed during the photodegradation of BTH. Further insight was obtained by monitoring concentrations of the sulfate ion ( SO 4 2 − ) and nitrate ion ( NO 3 − ) , which demonstrated that the intermediate products of BTH could be decomposed ultimately. Based on the results, the potential photodegradation pathway of BTH was also proposed.

Investigation of Adsorption Effect of Carbon Monoxide on Coniine: A DFT Study

2021 ◽  
Vol 17 ◽  
Author(s):  
Siyamak Shahab ◽  
Masoome Sheikhi ◽  
Mehrnoosh Khaleghian ◽  
Marina Murashko ◽  
Mahin Ahmadianarog ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Gas Phase ◽  
Density Functional ◽  
Energy Gap ◽  
Adsorption Effect ◽  
Chemical Shift Tensors ◽  
Solvent Water ◽  
Donor And Acceptor ◽  
Before And After ◽  
Electron Donor And Acceptor

: For the first time in the present study, the non-bonded interaction of the Coniine (C8H17N) with carbon monoxide (CO) was investigated by density functional theory (DFT/M062X/6-311+G*) in the gas phase and solvent water. The adsorption of the CO over C8H17N was affected on the electronic properties such as EHOMO, ELUMO, the energy gap between LUMO and HOMO, global hardness. Furthermore, chemical shift tensors and natural charge of the C8H17N and complex C8H17N/CO were determined and discussed. According to the natural bond orbital (NBO) results, the molecule C8H17N and CO play as both electron donor and acceptor at the complex C8H17N/CO in the gas phase and solvent water. On the other hand, the charge transfer is occurred between the bonding, antibonding or nonbonding orbitals in two molecules C8H17N and CO. We have also investigated the charge distribution for the complex C8H17N/CO by molecular electrostatic potential (MEP) calculations using the M062X/6-311+G* level of theory. The electronic spectra of the C8H17N and complex C8H17N/CO were calculated by time dependent DFT (TD-DFT) for investigation of the maximum wavelength value of the C8H17N before and after the non-bonded interaction with the CO in the gas phase and solvent water. Therefore, C8H17N can be used as strong absorbers for air purification and reduce environmental pollution.

Sign in / Sign up

Export Citation Format

Share Document