Facile synthesis of Ag-ZnO core–shell nanostructures with enhanced photocatalytic activity

A.N. Kadam,D.P. Bhopate,V.V. Kondalkar,S.M. Majhi,C.D. Bathula,Anh-Vy Tran,이상화 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-

Ag-ZnO core–shell nanostructure (CSNS) was prepared via a facile wet chemical approach. Formation was certified by various characterization techniques. The surface plasmon band of Ag-ZnO CSNS was red-shifted. Photoluminescence quenching for Ag-ZnO CSNS was attributed to improved charge separation. Ag-ZnO CSNS exhibited ∼6 times higher photocatalytic activity than pristine ZnO and ∼4 times higher than TiO2 (P25). Such enhanced photocatalytic activity was attributed to synergistic effect, more charge separation, and higher surface area. Ag-ZnO CSNS also showed excellent photostability and reusability. Photocatalytic mechanism was discussed based on major reactive oxidative species such as OH and O2−.

Morphological evolution of Cu doped ZnO for enhancement of photocatalytic activity

Kadam, A.N.,Kim, Taek Gon,Shin, Dong Su,Garadkar, K.M.,Park, Jinsub ELSEVIER SCIENCE 2017 Journal of Alloys and Compounds Vol.710 No.-

<P><B>Abstract</B></P> <P>The structure, morphology and chemical doping in metal oxide are important factors that can influence on its photocatalytic activity. In this work, a facile and template free reflux method has been used to synthesize ZnO nanostructures for the morphology control of cubes, maize corn seeds, and rods at low temperature. The photocatalytic activity of ZnO with different morphology was evaluated towards degradation of methyl orange under UV light illumination. Among all the morphology controlled ZnO, the maize corn seed shaped ZnO shows the superior photocatalytic activity. Moreover, the influence of Cu contents on the structural, optical, and photocatalytic activity of ZnO maize corn seed was also investigated systematically. The photocatalytic experiment towards the degradation of methyl orange revealed that the 0.5 mol% Cu doped ZnO exhibits 3.5 fold higher photocatalytic activity than pure corn seed shaped ZnO. The enhancement of photocatalytic activity by Cu ions substituting in ZnO lattices is attributed to synergetic effect of Cu and ZnO, increase the separation of photogenerated electron-hole pairs, oxygen vacancy, decrease in crystallite size and the higher surface to volume ratio. Based on scavengers test, it was found that both superoxide and hydroxyl radicals are mainly actives species involved for the degradation of methyl orange.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ZnO with cube, corn seed and rod like morphology were prepared by a facile reflux method. </LI> <LI> Controlled Cu doping could be achieved at low temperature. </LI> <LI> The substitution of Cu<SUP>2+</SUP> in ZnO corn seed was confirmed by various characterization techniques. </LI> <LI> 0.5 mol% Cu doped ZnO exhibits 3.5 times higher photocatalytic activity than pure ZnO (Z5). </LI> <LI> Based on scavengers test, both superoxide and hydroxyl radicals are mainly actives species. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Effect of electron beam irradiation on chemically synthesized nanoflake-like CdS electrodes for photoelectrochemical applications

Shinde, S.K.,Kim, D.-Y.,Lee, D.S.,Ghodake, G.S.,Kadam, A.N.,Fulari, A.V.,Nawaz, Mohsin,Shahzad, Asif,Rath, M.C.,Fulari, V.J. Elsevier 2018 Colloids and surfaces. B, Biointerfaces Vol.164 No.-

<P><B>Abstract</B></P> <P>In this paper, we chemically synthesized interconnected nanoflake-like CdS thin films for photoelectrochemical solar cell applications and subsequently irradiated them with electron beam irradiation at various doses of irradiation. The as-synthesized and irradiated samples were characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), and electrochemical measurements. XRD and XPS results confirmed the formation of CdS with a hexagonal crystal structure. FE-SEM and HR-TEM studies confirmed the photoelectrochemical performance, which was dependent on the surface morphology. The calculated values for efficiency demonstrated an outstanding photoelectrochemical performance with a fill factor of 0.38 and efficiency of 3.06% at 30 kGy. The high photoelectrochemical performance may be due to the interconnected nanoflake-like nanostructure and higher active surface area of the CdS samples. These results show that the electron beam irradiation is capable as an electrode for photoelectrochemical solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First time reported, modified CdS using electron beam irradiation for Solar cell. </LI> <LI> Different size nanostructure of CdS. </LI> <LI> After irradiation CdS sample shows provide more surface area. </LI> <LI> 30 kGy irradiated CdS sample shows excellent solar cell application. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Fill factor/Power conversion efficiency Vs different irradiations doses, pristine and electron irradiated, at 10 kGy, 20 kGy, and 30 kGy.</P> <P>[DISPLAY OMISSION]</P>

Improving light extraction in light-emitting diodes using zinc-tin-oxide layers

Kim, T.G.,Shin, D.S.,Jung, K.-Y.,Kadam, A.N.,Park, J. ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.710 No.-

<P><B>Abstract</B></P> <P>In this study, we report on the synthesis and applications of zinc-tin-oxide (ZTO) as a light extraction layer for GaN-based light-emitting diodes (LED). The ZTO layers formed on top of an LED epi-structure with a variable Sn-ratio, which was deposited by the spin coating method. The transmission spectra of the ZTO layers with Zn to Sn ratios of 1:1 (ZTO-I) and 1:5 (ZTO-II) exhibited optical transmittances of 98% and 88% in the visible region, respectively. The electroluminescence (EL) and light power-current-voltage (L-I-V) measurements show that double ZTO layers consisting of various Zn to Sn ratios led to enhanced light extraction from blue LEDs. The improvement of light extraction in the LEDs can be attributed to the gradually reduced refractive index of the ZTO layers, which enlarges the photon escape cone and minimizes the Fresnel refraction loss at the interface between air and GaN.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Improved light extraction in GaN-based LEDs via the spin-coated ZTO nanoparticles. </LI> <LI> A gradual change in the refractive index of ZTO by controlling the ratio of Zn:Sn. </LI> <LI> ZTO double layers with gradually changed refractive index improved light extraction. </LI> </UL> </P>

Morphological enhancement to CuO nanostructures by electron beam irradiation for biocompatibility and electrochemical performance

Shinde, S.K.,Kim, D.-Y.,Ghodake, G.S.,Maile, N.C.,Kadam, A.A.,Lee, Dae Sung,Rath, M.C.,Fulari, V.J. Elsevier 2018 Ultrasonics sonochemistry Vol.40 No.1

<P><B>Abstract</B></P> <P>This paper reports the effect of electron beam irradiation on CuO thin films synthesized by the successive ionic layer adsorption and reaction (SILAR) method on copper foil for supercapacitor and biocompatibility application. Pristine and irradiated samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and electrochemical study. Pristine and irradiated CuO films were pure monoclinic phase, with uniform nanostructures over the whole copper foil. After irradiation, CuO samples had formed innovative nanostructures. Biocompatibility of pristine and irradiated CuO samples suggest that CuO sample is non-toxic and ecofriendly. The specific capacitance of pristine and irradiated CuO strongly depends on surface morphology, and CuO electrodes after irradiation showed superior performance than pristine CuO. The highest specific capacitance of the 20kGy irradiated CuO nanoflowers exceeded 511Fg<SUP>−1</SUP> at 10mVs<SUP>−1</SUP> in 1M KOH electrolyte. Irradiated CuO samples also showed lower ESR, and were superior to other report electrical energy storage materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel route for the synthesis of pure CuO thin films. </LI> <LI> Different nanostructure of pure CuO and irradiated CuO electrode. </LI> <LI> 20kGy irradiated CuO electrode offer high surface area. </LI> <LI> 20kGy irradiated CuO electrode shows excellent supercapacitive properties. </LI> </UL> </P>

In situ one pot synthesis of nanoscale TiO2-anchored reduced graphene oxide (RGO) for improved photodegradation of 5-fluorouracil drug

Nipane, S. V.,Lee, Sang-Wha,Gokavi, G. S.,Kadam, A. N. Springer-Verlag 2018 Journal of materials science Materials in electron Vol.29 No.19