Microwave-assisted synthesis and deposition of a thin ZnO layer on microwave-exfoliated graphene: optical and electrochemical evaluations

RSC Advances ◽  
2015 ◽  
Vol 5 (83) ◽  
pp. 67988-67995 ◽  
Author(s):  
Rajesh Kumar ◽  
Rajesh Kumar Singh ◽  
Alfredo R. Vaz ◽  
Stanislav A. Moshkalev
Keyword(s):  
Zinc Oxide ◽  
Electrochemical Properties ◽  
Oxide Layer ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Exfoliated Graphene ◽  
Microwave Assisted Method

A rapid and facile microwave-assisted method has been developed for the deposition of a zinc oxide layer on partially microwave exfoliated graphene. The as-prepared hybrids demonstrate enhanced electrochemical properties and show quenching phenomena.

Microwave-assisted synthesis of carbon dots–zinc oxide/multi-walled carbon nanotubes and their application in electrochemical sensors for the simultaneous determination of hydroquinone and catechol

RSC Advances ◽  
2016 ◽  
Vol 6 (116) ◽  
pp. 115317-115325 ◽  
Author(s):  
Yaru Yan ◽  
Qitong Huang ◽  
Chan Wei ◽  
Shirong Hu ◽  
Hanqiang Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Zinc Oxide ◽  
Cyclic Voltammetry ◽  
Carbon Dots ◽  
Electrochemical Sensors ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Cyclic voltammetry of HQ and CC recorded on Nafion/CDs–ZnO/MWCNTs/GCE.

Microwave-assisted synthesis of pyrite FeS2 microspheres with strong absorption performance

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65575-65582 ◽  
Author(s):  
Jian Wu ◽  
Yuxuan Liang ◽  
Pengpeng Bai ◽  
Shuqi Zheng ◽  
Liqiang Chen
Keyword(s):  
Strong Absorption ◽  
High Yield ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Absorption Performance ◽  
Average Size ◽  
Microwave Assisted Method

Pyrite FeS2 microspheres with an average size of approximately 1.1 μm were successfully synthesised in high yield via a facile and efficient microwave-assisted method.

Microwave-Assisted Synthesis and Characterization of Zinc Oxide Micropowder

2010 ◽  
Vol 93-94 ◽  
pp. 643-646
Author(s):  
Pusit Pookmanee ◽  
Supasima Makarunkamol ◽  
Sakchai Satienperakul ◽  
Jiraporn Kittikul ◽  
Sukon Phanichphant
Keyword(s):  
Zinc Oxide ◽  
Radiation Power ◽  
Ammonium Hydroxide ◽  
Zinc Nitrate ◽  
Hexagonal Structure ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted

Zinc oxide micropowder was synthesized by a microwave-assisted method. Zinc nitrate and ammonium hydroxide were used as the starting precursors with the mole ratio of 1:1. The white precipitated powder was formed after adding ammonium hydroxide until the pH of final solution was 9 and treated with the microwave radiation power at 1000 Watt for 2-6 min. The phase of zinc oxide micropowder was examined by X-ray diffraction (XRD). A single phase of hexagonal structure was obtained. The morphology and chemical composition of zinc oxide micropowder were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The particle was plate-like in shape with the range of particle size of 0.1-0.5 µm. The elemental composition of zinc oxide showed the characteristic X-ray energy value as follows: zinc of Lα = 1.012 keV, Kα = 8.630 keV and Kβ = 9.570 keV and oxygen of Kα = 0.525 keV, respectively.

Fast and facile microwave-assisted synthesis of graphene oxide nanosheets

RSC Advances ◽  
2014 ◽  
Vol 4 (104) ◽  
pp. 60102-60105 ◽  
Author(s):  
Xiaobo Wang ◽  
Heqing Tang ◽  
Shuangshuang Huang ◽  
Lihua Zhu
Keyword(s):  
Graphene Oxide ◽  
Microwave Assisted Synthesis ◽  
Graphene Oxide Nanosheets ◽  
Microwave Assisted ◽  
Microwave Assisted Method

A fast and facile microwave-assisted method was developed for preparing GO.

scholarly journals Microwave-assisted synthesis and characterization of microstar shaped zinc oxide

Quimica Hoy ◽  
2012 ◽  
Vol 2 (3) ◽  
pp. 3
Author(s):  
Idalia Gómez ◽  
Miguel José Yucam´án ◽  
Flor Palomar
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Microwave Assisted Synthesis ◽  
Stoichiometric Ratio ◽  
Crystalline Materials ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
Synthesis Procedure ◽  
Post Synthesis

A microwave-assisted solution-phase approach has been applied for the synthesis ofzinc oxide microstructures. Toe synthesis procedure was carried out by using the reagents: Zinc ni trate and Methenamine, at stoichiometric ratio. Analysis by means ofX-ray Diffraction (XRD) shows a crystalline phase in hexagonal wurtzite arrangement for ZnO. The presence ofmicrostar shaped zinc oxide (2-3μm) with nanorods,f50nm) arranged has been confirmed from High Resolution Scanning Electron Microscopy (HRSEM). The formation of nanorods was confirmed by Transmission Electron Microscopy. In Raman spectroscopy a red shift was detected in the microstructures compared with ZnO bulk. High crystalline materials without additional post-synthesis treatrnent were found.

scholarly journals Microwave-Assisted Synthesis of Para-Nitrophenol Using Calcium Nitrate

2021 ◽  
Vol 37 (1) ◽  
pp. 243-246
Author(s):  
Ivy Joyce Arenas Buan ◽  
Dyanne Jane Cid Duldulao
Keyword(s):  
Phenyl Ring ◽  
Calcium Nitrate ◽  
High Yield ◽  
Microwave Assisted Synthesis ◽  
Vibration Modes ◽  
Base Peak ◽  
Environmental Threats ◽  
Microwave Assisted ◽  
Environmentally Safe ◽  
Microwave Assisted Method

Conventional process of nitrating phenolic compounds involves the use of excess corrosive reagents that impose environmental threats. Rapid and environmentally friendly microwave-assisted nitration of phenol has been employed to limit the use of corrosive nitric acid and sulfuric acid. In this study, phenol is reacted to calcium nitrate and acetic acid, which served as nitrating agents. The solution is irradiated under microwave to complete the nitration process. This microwave-assisted- synthesis is a rate- enhanced process that showed complete nitration in a short reaction time of 1 min with a high yield of 89%. Bands of phenyl ring, OH, CO, and nitro groups observed in the FTIR spectra correspond to the vibration modes of para-nitrophenol. GCMS analysis showed a retention time of 7 min for the product with 139m/z base peak with matches that confirms the synthesis of para- nitrophenol. This microwave-assisted method can be employed as an efficient, environmentally safe, and rapid alternative nitration method for the synthesis of para-nitrophenol.

scholarly journals A Microwave-Assisted Synthesis of Zinc Oxide Nanocrystals Finely Tuned for Biological Applications

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 212 ◽  
Author(s):  
Nadia Garino ◽  
Tania Limongi ◽  
Bianca Dumontel ◽  
Marta Canta ◽  
Luisa Racca ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Colloidal Stability ◽  
Cell Uptake ◽  
Biological Behavior ◽  
Microwave Assisted Synthesis ◽  
Biological Applications ◽  
Uniform Size ◽  
Chemical Surface ◽  
Microwave Assisted ◽  
Synthesis Procedure

Herein we report a novel, easy, fast and reliable microwave-assisted synthesis procedure for the preparation of colloidal zinc oxide nanocrystals (ZnO NCs) optimized for biological applications. ZnO NCs are also prepared by a conventional solvo-thermal approach and the properties of the two families of NCs are compared and discussed. All of the NCs are fully characterized in terms of morphological analysis, crystalline structure, chemical composition and optical properties, both as pristine nanomaterials or after amino-propyl group functionalization. Compared to the conventional approach, the novel microwave-derived ZnO NCs demonstrate outstanding colloidal stability in ethanol and water with long shelf-life. Furthermore, together with their more uniform size, shape and chemical surface properties, this long-term colloidal stability also contributes to the highly reproducible data in terms of biocompatibility. Actually, a significantly different biological behavior of the microwave-synthesized ZnO NCs is reported with respect to NCs prepared by the conventional synthesis procedure. In particular, consistent cytotoxicity and highly reproducible cell uptake toward KB cancer cells are measured with the use of microwave-synthesized ZnO NCs, in contrast to the non-reproducible and scattered data obtained with the conventionally-synthesized ones. Thus, we demonstrate how the synthetic route and, as a consequence, the control over all the nanomaterial properties are prominent points to be considered when dealing with the biological world for the achievement of reproducible and reliable results, and how the use of commercially-available and under-characterized nanomaterials should be discouraged in this view.

Sign in / Sign up

Export Citation Format

Share Document