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Antony Ananth,Ihn Han,Mahmuda Akter,Jin-Hyo Boo,Eun Ha Choi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
In this study, zinc sulphide nanomaterial (ZnS NM) powders were prepared with the assistance of anatmospheric pressure soft jet plasma (APPJ) device. Regular approaches to ZnS preparation mainlyresulted in aggregated powders, thus plasma methods were investigated to obtain controlledmorphological structures. The APPJ plasma-assisted ZnS exhibited unique surface architectures, suchas nanorods, layers and spherical aggregates, that were controllably obtained by changing the reactantconcentration and type of precursor. The prepared ZnS showed good thermal stability by no changes in itscomposition up to 400 C. The APPJ plasma-assisted ZnS showed sphalerite and wurtzite crystalstructures and resulted in excellent chemical purity. The simple and handy APPJ plasma method showsgood potential for shape-controlled ZnS NMs preparation without addition of surfactant chemicals,mechanical stirring, external heating or any other tedious procedures. This capability showcases thescientific and technological merit of this technique. The prepared ZnS NMs were utilized as antibacterialagents and evaluated the activity using three techniques against the human pathogens of E. coli, S. aureusand K. pneumoniae. The ZnS NMs showed effective concentration and shape-dependent activity whenused as an antibacterial material.
Ananth, Antony,Dharaneedharan, Subramanian,Heo, Moon-Soo,Mok, Young Sun Elsevier 2015 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.262 No.-
<P><B>Abstract</B></P> <P>Present study deals with the preparation of differently shaped copper oxide nanomaterials (CuO NMs) using simple, reproducible wet chemical and hydrothermal approach. The influence of polyethylene glycol on the morphological control was also studied. The prepared nanomaterials exhibited new types of surface morphologies such as rice grain-like, needle-like and plate-like. The Fourier transform infrared spectra and the X-ray photoelectron spectra of all the samples showed identical chemical functional groups and did not exhibit the presence of any impurities. They exhibited good stability in the aqueous environment with the zeta potential values between −25 and −27mV. The shape dependent anti-bacterial property of the prepared CuO NMs was evaluated against two Gram-positive bacteria namely <I>Streptococcus iniae</I> and <I>Streptococcus parauberis</I> and two Gram-negative bacteria such as <I>Escherichia coli</I> and <I>Vibrio anguillarum</I>. Among three CuO NMs, the plate-like CuO NMs displayed more powerful antibacterial activity than grain or needle shaped CuO NMs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple synthesis procedure with good reproducibility. </LI> <LI> Preparation of spherical, rice grain-like, needle-like and plate-like CuO NMs. </LI> <LI> Antimicrobial activity and mechanism. </LI> <LI> Shape dependent performance. </LI> </UL> </P>
Antony, Ananth,Young Sun, Mok,Jin-Hyo, Boo,Byung You, Hong Elsevier 2018 Journal of solid state chemistry Vol.265 No.-
<P><B>Abstract</B></P> <P>This research deals with preparation, characterization and shape dependent performance of copper oxide nanomaterials (CuO NMs) in simple carbon monoxide (CO) oxidation catalysis. Uniform and high purity rice grains-like, needle-like and sheet-like CuO NMs were achieved by adopting different experimental conditions. The shape selective CuO NMs were physically mixed and re-pelletized with γ-Al<SUB>2</SUB>O<SUB>3</SUB> thus 1 wt% CuO/γ-Al<SUB>2</SUB>O<SUB>3</SUB> catalyst was prepared. The catalysts exhibited good surface area (186–190 m<SUP>2</SUP> g<SUP>−1</SUP>), crystallinity, thermal stability and metal dispersion. The performance of various shape CuO/γ-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts in CO oxidation catalysis showed that needle-like CuO NMs performed superior against grains-like or sheet like CuO NMs in the temperature region between 200 and 225 °C. The 100% CO<SUB>2</SUB> formation was achieved at 325 and 400 °C in the dry and wet conditions. Also, in every process temperature, differences in the catalytic activity due to catalyst's shape could be noted significantly. It was observed that the catalyst morphology played main role in achieving efficient catalytic process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Shape-selective preparation of CuO nanostructures. </LI> <LI> Physicochemical characterizations. </LI> <LI> Shape dependent catalytic CO oxidation performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>This research deals with the preparation, characterization and shape dependent performance of copper oxide nanomaterials (CuO NMs) in simple carbon monoxide (CO) oxidation catalysis. Uniform and high purity rice grains-like, needle-like and sheet-like CuO NMs were achieved by adopting different experimental conditions. The performance of various shape CuO/γ-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts in CO oxidation catalysis showed that needle-like CuO NMs performed superior against grains-like or sheet like CuO NMs in the temperature region between 200 and 225 °C. In every process temperature, differences in the catalytic activity due to catalyst's shape could be noted significantly.</P> <P>[DISPLAY OMISSION]</P>
Ananth, Antony,Dharaneedharan, Subramanian,Seo, Hyeon-Jin,Heo, Moon-Soo,Boo, Jin-Hyo Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.322 No.-
<P><B>Abstract</B></P> <P>This manuscript discusses about size and shape-selective preparation of Zinc oxide nanomaterials (ZnO NMs) using simple and handy soft jet plasma source. The soft jet was operated in an atmospheric pressure with low energy consumption and utilized ambient air as a feed gas. The plasma synthesized ZnO NMs exhibited variety of surface morphology such as nanorods, nanosheets and micro-size flowers as compared to the conventional low temperature synthesized powders which showed spherical shape. The precursor concentrations and kinds of precursors were strongly influenced into the NMs morphology and possible growth mechanism in the presence of plasma has been proposed. It is suggested here that the soft jet plasma is an effective tool to control size and shape of ZnO NMs especially when the preparations demanding low temperature, surfactant free and cost-effective synthesis. The prepared ZnO NMs were tested for its shape dependent anti-bacterial property against Gram-positive bacteria namely <I>S. iniae</I> and <I>S. parauberis</I> and two Gram-negative bacteria such as <I>E. coli</I> and <I>V. anguillarum</I>. The flower-like ZnO NMs showed more powerful anti-bacterial activity than rod or sheet-like ZnO structures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Possibility to control surface morphology. </LI> <LI> Low cost, surfactant-free bulk synthesis. </LI> <LI> Proposed growth mechanism. </LI> <LI> Shape dependent anti-bacterial activity. </LI> </UL> </P>
Hyeon Jin Seo,Yeong Eun Gil,Ki‑Hwan Hwang,Antony Ananth,Jin‑Hyo Boo 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.4
In this study, a gate dielectric suitable for application in field effect transistors (FETs) was synthesized. Gate dielectrics weredeposited using cyclohexane via plasma-enhanced chemical vapor deposition. These films were synthesized on silicon waferssubstrates with plasma powers adjusted from 10 to 60 W. Graphene was synthesized on a nickel substrate by a thermal chemicalvapor deposition process and coupled to the plasma-polymer via water transfer. Alpha step, Fourier-transform infraredspectroscopy, Raman spectroscopy, and atomic force microscopy findings in addition to water contact angle measurementswere analyzed to characterize the physical and chemical properties of the plasma-polymer thin film. Furthermore, a probestation was used to characterize the FET devices fabricated using such films.