One-step preparation of ZnO nanoparticle-decorated reduced graphene oxide composites and their application to photocurrent generation
Jingqi TianSen LiuHaiyan LiLei WangYingwei ZhangYonglan LuoAbdullah M. AsiriAbdulrahman O. Al‐YoubiXuping Sun
49
Citation
33
Reference
10
Related Paper
Citation Trend
Abstract:
In this communication, we develop a facile, one-step strategy towards the rapid synthesis of ZnO nanoparticle-decorated reduced graphene oxide (rGO–ZnO) composites by directly immersing Zn plate in a GO solution containing ammonia with the aid of ultrasonication at room temperature. The rGO–ZnO composites obtained have applications in photocurrent generation in the visible spectral region of white light using zinc porphyrin (ZnP) as a photosensitizer.Keywords:
Photocurrent
Sonication
Visible spectrum
We demonstrate the use of novel type of sonication method, focused sonication, with added advantages over bath and probe type of sonication for the dispersion of single walled carbon nanotubes (SWNT). Di-chloro benzene was used as the solvent for dispersion of SWNT. Results from focused sonication and bath sonication were compared and found that focused sonication results in better dispersion. Also Raman spectroscopy was analysed to ascertain if focused sonication causes any damage to the tubes and it was found that there was no damage to the SWNT. We believe that with the added advantages like in-situ temperature control and large sample volume processing, focused sonication would prove to be the most proficient method of sonication for dispersion of nanoparticles.
Sonication
Cite
Citations (1)
We have fabricated and compared photocurrent generation properties of electropolymerized films consisting of 2,2′-bithiophene and a porphyrin derivative, 5,10,15,20-tetra(3-thienyl)-21H,23H-porphyrin or 5,10,15,20-tetra(2-thienyl)-21H,23H-porphyrin. It was found that the location and the concentration of porphyrin moieties in the films were different between the two porphyrin monomers, and the polymer film with the former porphyrin gave larger photocurrent than the latter. The result indicates that the molecular design of the polymer electrode is very important for effective photocurrent generation.
Photocurrent
Derivative (finance)
Cite
Citations (2)
Injectable poly-l-lactic acid (PLLA) carries the risk of nodule or microlump formation. Various methods including sonication have been tried to minimize these adverse effects of PLLA.This study investigated the change in size, distribution, and properties of PLLA particles after sonication, and the duration of sonication needed to reach the ideal particle size.Two indicators, the average size of PLLA particles and diameter at 90%, were measured at each timepoint: at 0, 10, 60, 120, and 240 minutes of sonication. The characteristics and particle shape were assessed at 0 and 240 minutes.The average particle size and the diameter at 90% decreased drastically until 10 minutes of sonication and then increased slightly at 60 minutes. After 60 minutes, the average size and the diameter at 90% gradually decreased over time and reached 42.2 μm and 75.7 μm, respectively, at 120 minutes. After 240 minutes of sonication, the average particle size was 35.9 μm, much smaller than the smallest proper size required (40 μm). Standard deviation decreased gradually over time, which means that a more even distribution was obtained. Crystalline remnants were significantly less left with 120 minutes sonication compared to those with 120 minutes hydration only. PLLA particles were more cracked at the center, and microcrystals were more loosely distributed at the periphery after 120 minutes sonication.Sonication help reduce the average size of PLLA particles and achieve more even distribution. Therefore, we believe sonication may attribute to the safer use of PLLA.
Sonication
Particle (ecology)
Cite
Citations (1)
Reaction of porphyrin-2,3-diones with aromatic aldehydes and NH4OAc in AcOH–CHCl3 affords 2-aryl-1H-imidazo[4,5-b]porphyrins which, with appropriate substitution, are useful building blocks for the synthesis of multi-porphyrin arrays; porphyrin-tetraones are similarly converted into the corresponding bis-fused systems.
Imidazole
Cite
Citations (49)
一半顺序的重新组合离子的自我补充肽 CH3CO-Pro-Ser-Phe-Cys-Phe-Lys-Phe-Glu-Pro-NH2 被报导，它能进稳定的 nanofibers 自我装配、形成 hydrogel 由组成 >99% 水。在这研究， nanofiber 支架是由超声的房间 disruptor 的 sonicated。sonication 的效果被通报检测二色性(CD ) ，原子力量显微镜学(AFM ) ，和流变学。AFM 图象说明了 sonicated 碎裂，这能快速重新集合进 nanofibers，当形态学从原来的是可区分的时。CD 光谱表明变换主要在常规海滨之间发生了结构和弄歪的海滨结构。Rheological 分析证明在在 sonication 以后的第 7 天的肽解决方案的存储模量(G) 在 sonication 前与解决方案的值相比在将近 40% 减少了。最后，一个嘴巧的变换模型被建议解释重新组合过程。
Sonication
Cite
Citations (0)
Cite
Citations (4)
Sonication
Specific surface area
Cite
Citations (71)
A 5,10,15,20-tetra(4-pyridyl)porphyrin (TPyP)-deposited ITO electrode as a sensor of nucleotides using photocurrent change was prepared. The TPyP-deposited ITO electrode could repeatedly detect nucleotides having concentrations of the μM order by a decrease in the photocurrent.
Cite
Citations (77)
A highly-uniform nanofiber of Ag-graphene-TiO 2 was successfully fabricated by the electrospinning technique, which exhibited significantly increased visible light absorption (λ > 420 nm) and improved photocurrent response. The Ag nanoparticles (AgNPs) and graphenes located in TiO 2 fibers induced an increase in the visible-light photocurrent response. The photocurrent density of Ag-graphene-TiO 2 fibers is 4-fold higher than the pristine TiO 2 fibers under visible light. The increased photocurrent response in visible light region is resulted from the strong interaction between TiO 2 fibers and graphene sheets, as well as the localized surface plasmon resonance of AgNPs.
Photocurrent
Visible spectrum
Electrospinning
Cite
Citations (0)
The express method for testing purity and stability of an indotricarbocyanine dye based photosensitizer for photodynamic therapy was developed. Storage of the hydrophilic photosensitizer under unfavorable conditions resulted in contamination with a hydrophobic dye. The absorption spectrum of the hydrophobic dye was characterized by a new band at 514 nm that was absent in the absorption spectrum of the photosensitizer. There was no spectral overlap between this absorption band and the absorbance of the photosensitizer. Therefore, presence of the band at 514 nm allowed us to detect contamination of the photosensitizer substance with the hydrophobic dye. It was established that the optimal photosensitizer concentration for purity testing is ca. 0.8 mmol/L, when as little as 0.6 wt. % of the impurity can be detected. The developed method is not time consuming and requires accessible equipment only. Data obtained with this method was verified with the aid of liquid chromatography-mass spectrometry.
Absorbance
Cite
Citations (2)