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Harsono, Heru,Wardana, I Nyoman Gede,Sonief, Achmad As'ad,Darminto, Darminto The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.1
The Zn1-xMnxO ($0.00{\leq}x{\leq}0.06$) samples have been synthesized in the form of powder by the coprecipitation method at low temperature using $Zn(CH_3COO)_2$. $2H_2O$ and $Mn(CH_3COO)_2$. $4H_2O$ powders, as well as HCl and $NH_4OH$ solutions as starting materials. Characterization was conducted using XRD, TEM, XRF, FTIR and VSM. The result shows that the $Zn_{(1-x)}Mn_xO$ ($0.00{\leq}x{\leq}0.06$) nanoparticles have the wurtzite phase with a hexagonal structure and particle sizes ranging from 17.48 to 118.83 nm. In a qualitative analysis of XRF, the peaks that confirm the existence of the manganese element in Mn-doped ZnO samples were observed. Meanwhile, FTIR test result shows that there are peaks at around $500cm^{-1}$ and $400cm^{-1}$ in the FTIR spectra for Mn doped ZnO samples which clearly reveal the existence of the (Zn, Mn)-O strain mode. The (Zn, Mn)-O absorption peak positions have shifted to a lower wave number with increasing Mn doping content. The peak intensity is also lower if compared to that of the ZnO sample without doping. From the VSM test, it is shown that $Zn_{(1-x)}Mn_xO$ ($0.00{\leq}x{\leq}0.06$) nanoparticles are all paramagnetic having monotonically increased susceptibility as increasing Mn content.
Yoyok Cahyono,Eddy Yahya,Mochamad Zainuri,Suminar Pratapa,Darminto 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.1
Intrinsic hydrogenated amorphous silicon (i-a-Si:H) fi lms were successfully grown on commercial glass substrate by plasmaenhanced chemical vapor deposition (PECVD), using various hydrogen dilutions (R = H 2 /SiH 4 ). Deposition was carried outat a substrate temperature of 270 °C, using radiofrequency power of 5 W, and chamber pressure of 2 Torr. The decreasingrate of deposition reduced defects in thin fi lm, attributed to the decreased Urbach energy. The reduced particle size led toincreased energy bandgap, inducing shift in transmittance to shorter wavelength (blue shift).
Paramagnetic Zn(1-x)MnxO (0.00≤x≤0.06) Nanoparticles Prepared by The Coprecipitation Method
Heru Harsono,I Nyoman Gede Wardana,Achmad As'ad Sonief,Darminto 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.1
The Zn1-xMnxO (0.00≤x≤0.06) samples have been synthesized in the form of powder by the coprecipitation methodat low temperature using Zn(CH3COO)2. 2H2O and Mn(CH3COO)2. 4H2O powders, as well as HCl and NH4OH solutionsas starting materials. Characterization was conducted using XRD, TEM, XRF, FTIR and VSM. The result shows that theZn(1-x)MnxO (0.00≤x≤0.06) nanoparticles have the wurtzite phase with a hexagonal structure and particle sizes rangingfrom 17.48 to 118.83 nm. In a qualitative analysis of XRF, the peaks that confirm the existence of the manganeseelement in Mn-doped ZnO samples were observed. Meanwhile, FTIR test result shows that there are peaks at around500 cm-1 and 400 cm-1 in the FTIR spectra for Mn doped ZnO samples which clearly reveal the existence of the (Zn,Mn)-O strain mode. The (Zn, Mn)-O absorption peak positions have shifted to a lower wave number with increasingMn doping content. The peak intensity is also lower if compared to that of the ZnO sample without doping. Fromthe VSM test, it is shown that Zn(1-x)MnxO (0.00≤x≤0.06) nanoparticles are all paramagnetic having monotonicallyincreased susceptibility as increasing Mn content.
Small-Angle X-Ray Scattering Study on PVA/Fe3O4 Magnetic Hydrogels
Sunaryono,Ahmad Taufiq,Edy Giri Rahman Putra,Atsushi Okazawa,Isao Watanabe,Norimichi Kojima,Supagorn Rugmai,Siriwat Soontaranon,Mohammad Zainuri,Triwikantoro,Suminar Pratapa,Darminto 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.3
A synchrotron small-angle X-ray scattering (SAXS) study on PVA/Fe3O4 magnetic hydrogels has been performed to investigate the effect of clustering on their magnetic properties. The hydrogels were prepared through freezing–thawing (F–T) processes. The structure, morphology and magnetic properties of magnetite (Fe3O4) nanoparticles (NPs) were investigated using X-ray diffractometry (XRD), transmission electron microscopy (TEM) and a superconducting quantum interference device (SQUID) magnetometer, respectively. In this study, SAXS data were used to reveal the structural dimensions of the magnetite and its distribution in the polymer-rich PVA and magnetic hydrogels. As calculated using the Beaucage and Teubner–Strey models, the average of the structural dimensions of the PVA hydrogels was 3.9 nm (crystallites), while the average distance between crystallites was approximately 18 nm. Further analysis by applying a two-lognormal distribution showed that the magnetite NPs comprised secondary particles with a diameter of 9.6 nm that were structured by primary particles (~3.2 nm). A two-lognormal distribution function has also been used in describing the size distributions of magnetite NPs in magnetic hydrogels. The clusters of magnetite NPs in the magnetic hydrogels are significantly reduced from 30.4 nm to 12.8 nm with decreasing concentration of the NPs magnetite from 15 wt.% to 1 wt.%. The saturation magnetization values of the magnetite NPs, the 15% and 1% magnetic hydrogels were 34.67 emu/g, 6.52 emu/g and 0.37 emu/g, respectively.
A. Taufiq,A. F. Muyasaroh,S. Sunaryono,H. Susanto,N. Hidayat,N. Mufti,E. Suarsini,A. Hidayat,A. Okazawa,T. Ishida,D. Darminto 한국자기학회 2018 Journal of Magnetics Vol.23 No.3
In this work, the soft-template technique was employed in preparing the superparamagnetic Fe₃O₄ nanoparticles from natural iron sand. A series of the Fe3O4 nanoparticles formed spinel crystal structure with the particle size in the range of 1.9 to 6.6 nm which was varied by diethylamine concentration as the template. All samples had the functional groups of Fe<SUP>3+</SUP>-O<SUP>2−</SUP>, Fe<SUP>2+</SUP>-O<SUP>2−</SUP> and OH and exhibited the superparamagnetic character. The antibacterial activity of the Fe₃O₄ nanoparticles showed a significant outcome to pathogen growth rate. Pre-administration of bacterial stock solution (E. coli and B. substilis) with magnetite significantly reduced the colony formation compared to control group. In particular, for Gram-negative bacteria growth rate, pretreatment with magnetite declined the colony formation considerably compared to placebo and positive control group. Also, in line with Gram-negative bacteria, the similar pattern of the bacterial killing property was observed in Gram-positive bacteria.