Morphological, structural, and optical properties of Co-doped ZnO NPs prepared by precipitation method

S. Iwan,D. Dianisya,Riser Fahdiran,Isnaeni,Esmar Budi,Anggara Budi Susila,Erfan Handoko 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5

We have synthesized un-doped and Co-doped ZnO nanoparticles (NPs) by precipitation method at a temperature of 400 oC for 2 hours. According to the inorganic crystal structure database (ICSD) number #98-005-7478, the XRD pattern of ZnO NPs (average diameter of 99-144 nm) possess polycrystalline hexagonal wurtzite structure. The crystallite size of un-doped and 1.75 at.%, 3.79 at.%, 4.37 at.% Co-doped ZnO NPs are 20.81 nm, 19.84 nm, 43.85 nm, 37.95 nm, respectively. Meanwhile, the average micro-strain of the un-doped ZnO NPs and 1.75 at.%, 3.79 at.%, 4.37 at.% Co-doped ZnO NPs are 0.62%, 0.66%, 0.29%, 0.34%. These results confirm the crystallite size and micro-strain changing by Co incorporation. Further investigation, the Co incorporation into Zn site improve absorbance of ZnO NPs. Meanwhile, photoluminescence (PL) measurement shows that all ZnO NPs have one broad emission with centered peaks of 385 nm. It is indicating the substitution Zn2+ by Co2+ cause the distribution defect spread continuously in ZnO NPs structure

Physicochemical, Antibacterial Properties, and Compatibility of ZnO-NP/Chitosan/β-Glycerophosphate Composite Hydrogels

( Pingping Huang ),( Wen Su ),( Rui Han ),( Hao Lin ),( Jing Yang ),( Libin Xu ),( Lei Ma ) 한국미생물생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.4

In this study we aimed to develop novel ZnO-NP/chitosan/β-glycerophosphate (ZnO-NP/CS/β-GP) antibacterial hydrogels for biomedical applications. According to the mass fraction ratio of ZnO-NPs to chitosan, mixtures of 1, 3, and 5% ZnO-NPs/CS/β-GP were prepared. Using the test-tube inversion method, scanning electron microscopy and Fourier-transform infrared spectroscopy, the influence of ZnO-NPs on gelation time, chemical composition, and cross-sectional microstructures were evaluated. Adding ZnO-NPs significantly improved the hydrogel's antibacterial activity as determined by bacteriostatic zone and colony counting. The hydrogel's bacteriostatic mechanism was investigated using live/dead fluorescent staining and scanning electron microscopy. In addition, crystal violet staining and MTT assay demonstrated that ZnO-NPs/CS/β-GP exhibited good antibacterial activity in inhibiting the formation of biofilms and eradicating existing biofilms. CCK-8 and live/dead cell staining methods revealed that the cell viability of gingival fibroblasts (L929) cocultured with hydrogel in each group was above 90% after 24, 48, and 72 h. These results suggest that ZnO-NPs improve the temperature sensitivity and bacteriostatic performance of chitosan/β-glycerophosphate (CS/β-GP), which could be injected into the periodontal pocket in solution form and quickly transformed into hydrogel adhesion on the gingiva, allowing for a straightforward and convenient procedure. In conclusion, ZnO-NP/CS/β-GP thermosensitive hydrogels could be expected to be utilized as adjuvant drugs for clinical prevention and treatment of peri-implant inflammation.

Physical and nuclear shielding properties of newly synthesized magnesium oxide and zinc oxide nanoparticles

Rashad, M.,Tekin, H.O.,Zakaly, Hesham MH.,Pyshkina, Mariia,Issa, Shams A.M.,Susoy, G. Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.9

Magnesium oxide (MgO) and Zinc oxide (ZnO) nanoparticles (NPs) have been successfully synthesized by solid-solid reaction method. The structural properties of ZnO and MgO NPs were studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results indicated a formation of pure MgO and ZnO NPs. The mean diameter values of the agglomerated particles were around to be 70 and 50 nm for MgO and ZnO NPs, respectively using SEM analysis. Further, a wide-range of nuclear radiation shielding investigation for gamma-ray and fast neutrons have been studied for Magnesium oxide (MgO) and Zinc oxide (ZnO) samples. FLUKA and Microshield codes have been employed for the determination of mass attenuation coefficients (μ_m) and transmission factors (TF) of Magnesium oxide (MgO) and Zinc oxide (ZnO) samples. The calculated values for mass attenuation coefficients (μ_m) were utilized to determine other vital shielding properties against gamma-ray radiation. Moreover, the results showed that Zinc oxide (ZnO) nanoparticles with the lowest diameter value as 50 nm had a satisfactory capacity in nuclear radiation shielding.

Highly selective detection of dimethyl methylphosphonate (DMMP) using CuO nanoparticles /ZnO flowers heterojunction

Yoo, R.,Yoo, S.,Lee, D.,Kim, J.,Cho, S.,Lee, W. Elsevier Sequoia 2017 Sensors and actuators. B, Chemical Vol.240 No.-

Here we report the fabrication of high surface area CuO nanoparticles (NPs) on micron-scale ZnO (CuO/ZnO) ''flowers'' with dimethyl methylphosphonate (DMMP) gas sensing capabilities. The formation of CuO NPs/ZnO heterojunction structures was confirmed by PXRD and TEM analyses. The gas sensing properties of the CuO NPs/ZnO structures showed a faster response time (26.2s) compared to the exclusively ZnO-based sensor (330s). The heterojunction sensors demonstrated the highest selectivity in 10ppm DMMP, reaching the high value of 626.21 at 350<SUP>o</SUP>C. This CuO NPs/ZnO heterojunction structure provides an extension of the depletion layer and an increase of the resistance (R<SUB>a</SUB>) in air, leading to a reduction of the depletion layer and resistance (R<SUB>g</SUB>) when exposed to reducing DMMP gas. The higher surface area (6.0m<SUP>2</SUP>/g) of the CuO/ZnO heterojunction structure with a 0.5h synthesis time of the ZnO flowers further promoted the adsorption kinetics for the reaction between C<SUB>3</SUB>H<SUB>9</SUB>O<SUB>3</SUB>P and O<SUP>2-</SUP> when exposed to DMMP, thus enhancing its sensing properties.

Dopamine conjugated nanoparticle device as a resistive switching device

권다혜,정지희,이효선,정헌상,이현호 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

Dopamine (DOPA) is a well-known neurotransmitter in nerve system. In this study, in order to construct a nanobiotechnology-based electronics, zinc oxide nanoparticles (ZnO NPs) were coupled with dopamine and adopted as nanotraps for resistive switching device. The resistive switching device was fabricated in a structure of metal (Al)/DOPA-ZnO NPs+PVP(polyvinylphenol)/metal (ITO: Indium Tin Oxide). Resistive switching characteristics between ZnO NPs and DOPA-ZnO NPs devices were characterized and compared. This resistive switching device can be further developed to form neuromorphic analog device, which can open up a bioelectronic device acting as memory and calculation elements.

Resistive switching characteristics of cortisol-conjugated nanoparticle-based device

정지희,권다혜,정헌상,이효선 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

Cortisol is a steroid hormone or stress biomarker produced by adrenal cortex of mammals, whose importance for its detection is increasing. In this study, a bioelectronic structure using cortisol conjugated zinc oxide (ZnO) nanoparticles (NPs) as charge storing elements on metal(Al)/ cortisol-ZnO NPs+PVP(polyvinylphenol)/metal(ITO: Indium Tin Oxide) resistive switching device is demonstrated. Current/voltage(I-V) performance of the resistive switching device is measured to investigate charging effect out of cortisol-ZnO NPs for bistable electrical resistive states. The device can be expandable to develop a new conceptual detection sensor for cortisol detection.

Serum and ultrastructure responses of common carp (Cyprinus carpio L.) during long-term exposure to zinc oxide nanoparticles

Lee, J.w.,Kim, J.e.,Shin, Y.j.,Ryu, J.s.,Eom, I.c.,Lee, J.S.,Kim, Y.,Kim, P.j.,Choi, K.h.,Lee, B.c. Academic Press 2014 Ecotoxicology and environmental safety Vol.104 No.-

<P>The uptake of nanoparticles by aquatic organisms such as fish has raised concerns about the possible adverse effects of nanoparticles (NPs). In this study, we aimed to evaluate the toxicological effects in juvenile common carp exposed to zinc oxide nanoparticles (ZnO-NPs) for 12 weeks. The carp were exposed to 0 (control), 0.1, 0.3, 0.8, and 2.4 mg/L of ZnO-NPs under a flow-through exposure system. Fish were sampled at 0, 4, 8, and 12 weeks to test for zinc in the test water and blood, and biochemistry analysis; further, they were sampled at 12 weeks to observe ultrastructural changes in the liver, kidney, and gill. In the organic serum, changes in the glutamic pyruvic transaminase/alanine aminotransferase (GPT/ALT) and glutamic oxaloacetic transaminase/aspartate aminotransferase (GOT/AST) levels were significant, but changes in the lactate dehydrogenase (LDH) and alkaline phosphatase (ALP) levels were not significantly different across all exposure periods. In the inorganic serum, the magnesium (Mg), inorganic phosphorus (IF), sodium (Na+), and chloride (Cl) levels were significantly different in the exposure group and across exposure periods. However, calcium (Ca) and potassium (K+) levels were not significantly different. In the enzyme serum, the glucose (GLU) level significantly increased for the highest exposure group, but the total cholesterol (TCHO), triglyceride (Tg), and total protein (TP) levels were not significantly different during the exposure period. Ultrastructural changes in the liver induced changes in the black granules (of various sizes) in the lysosomes, indistinct nucleus membrane, and non-spherical nucleus. In the kidney, some mild changes were observed in the size and number of the lysosomes in the renal tubule. Desquamation and hypertrophy of pavement epithelial cells and vacuolation in the cytoplasm of the chloride cells were observed in the gill. Nanoparticles were also observed in the red blood cells, cytoplasm of all tissues, and glomerulus of the kidney. The observed changes in the serum and tissues may provide useful information regarding environmental conditions and risk assessments of aquatic organisms. (C) 2014 Elsevier Inc. All rights reserved.</P>

Role of zinc oxide nanoparticles in the management of disease complex of beetroot ( Beta vulgaris L.) caused by Pectobacterium betavasculorum , Meloidogyne incognita and Rhizoctonia solani

Manzoor R. Khan,Zaki A. Siddiqui 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.2

The impact of zinc oxide nanoparticles (ZnO NPs) in 100 and 200 mg L −1 concentrations was examined on the hatchingand mortality of M. incognita (Mi) and the growth of P. betavasculorum (Pb) and R. solani (Rs) under in vitro conditions. ZnO NPs inhibited the hatching and caused mortality of 2nd stage juveniles (J2s) of Mi and also inhibited the growth ofPb and Rs. In pot experiments, ZnO NPs in 100 and 200 mg L −1 concentrations were delivered as a foliar spray and seedpriming for the management of disease complex of beetroot. Foliar spray of ZnO NPs to plants infected with pathogens orun-infected more effi ciently improved plant dry mass and physiological and biochemical parameters of beetroot than seedpriming. Foliar spray of ZnO NPs at 200 mg L −1 to plants infected with pathogens resulted in the greatest increase in plantdry mass, and physiological and biochemical parameters of beetroot. Seed priming and foliar spray of ZnO NPs causeda reduction in disease indices, nematode population, and root galling. Foliar spray of ZnO NPs at 200 mg L −1 caused themaximum reduction in disease indices, nematode multiplication, and root galling. The inductively coupled plasma massspectrometry (ICP-MS) analysis revealed that ZnO NPs were accumulated in shoots and roots of both infected and uninfectedplants independent of the application methodology. Overall, the fi ndings suggest that ZnO NPs as the foliar spray has thepotential for the management of root-knot, soft-rot, and root-rot, disease complex of beetroot.

Enhanced corrosion resistance and biocompatibility of AZ31 Mg alloy using PCL/ZnO NPs <i>via</i> electrospinning

Kim, Jinwoo,Mousa, Hamouda M.,Park, Chan Hee,Kim, Cheol Sang Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.396 No.-

<P><B>Abstract</B></P> <P>In the efforts to improve corrosion resistance and biocompatibility of magnesium alloys, polycarprolactone (PCL) and zinc oxide nanoparticles (ZnO NPs) composite coatings were applied onto AZ31 Mg alloys <I>via</I> electrospinning technique in this study. The PCL/ZnO composite coatings on Mg alloys were characterized by using FE-SEM, EDX, XPS, and FT-IR. Moreover, coating adhesion test, electrochemical corrosion test, and biocompatibility test <I>in vitro</I> were performed to measure coating performance. Our results revealed that the increase in the content of ZnO NPs in the composite coatings not only improved the coating adhesion of composite coatings on Mg alloys, but also increased the corrosion resistance. Furthermore, the biocompatibility of MC3T3-E1 osteoblasts of the PCL/ZnO composite coated samples was superior to the biocompatibility of the bare samples. Such data suggest that applying PCL/ZnO composite coating to the magnesium alloys has suitable potential in biomedical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PCL/ZnO composite coating layer by electrospinning techniques showed the nano-scaled and porous surface structure. </LI> <LI> Addition of zinc oxide NPs in the PCL fibers led to enhanced coating adhesion and corrosion resistance. </LI> <LI> The composite coated surfaces on Mg substrates improved cell attachment and proliferation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Clean Sono-synthesis of ZnO on Cotton/Nylon Fabric Using Dopamine: Photocatalytic, Hydrophilic, Antibacterial Features

Elham Siami Aminloo,Majid Montazer 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1

In this paper, zinc oxide nanoparticles (NPs) were synthesized through sonication method as a green technique on50/50 nylon/cotton (N/C) blend fabric to create multi-functional purposes. The N/C blend fabric was treated with zinc acetateas an initial material to synthesis ZnO NPs in presence of dopamine hydrochloride (DP). Herein, different concentrations ofDP (0.01, 0.02, 0.05 and 0.50 g/l) were used to investigate its effect on characterizations of the treated fabrics with zincacetate. Surface of the raw and treated fabrics was characterized via Field emission scanning electron microscopy (FESEM),X-ray diffractometer (XRD) and UV-Visible absorption spectroscopy. The weight percentage of the zinc on the fabric wasroughly determined by EDX analysis. The DP perfectively affected on the morphology of ZnO NPs changed their shape tothe nanosheets. The hydroxyl groups on the DP create appropriate conditions for adsorption of the more ZnO NPs on surfaceof the fabric, consequently increasing degradation rate of methylene blue. In addition, antibacterial activities of the ZnO NPswere significantly growing to 100 % against Escherichia coli. Overall, this work indicates that DP can enhance someimportant functions of ZnO NPs on the N/C blend fabric including hydrophilic properties, photo and bio activities.