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Firman Mangasa Simanjuntak, Sridhar Chandrasekaran, Chun-Chieh Lin, Tseung-Yuen Tseng
The impact of peroxide surface treatment on the resistive switching characteristics of zinc peroxide (ZnO2 )-based programmable metallization cell (PMC) devices is investigated. The peroxide treatment results in a ZnO hexagonal to ZnO2 cubic phase transformation; however, an excessive treatment results in crystalline decomposition. The chemically synthesized ZnO2 promotes the occurrence of switching behavior in Cu/ZnO2 /ZnO/ITO with much lower operation current as compared to the Cu/ZnO/ITO (control device)...
October 19, 2018: Nanoscale Research Letters
D Maryenko, A McCollam, J Falson, Y Kozuka, J Bruin, U Zeitler, M Kawasaki
Interactions between the constituents of a condensed matter system can drive it through a plethora of different phases due to many-body effects. A prominent platform for it is a dilute two-dimensional electron system in a magnetic field, which evolves intricately through various gaseous, liquid and solid phases governed by Coulomb interaction. Here we report on the experimental observation of a phase transition between the composite fermion liquid and adjacent magnetic field induced phase with a character of Wigner solid...
October 19, 2018: Nature Communications
Hyeon Jin Jung, Ravindranadh Koutavarapu, Seulki Lee, Ju Hyun Kim, Hyun Chul Choi, Myong Yong Choi
To achieve enhanced photocatalytic activity for the degradation of lindane, we prepared metal-semiconductor composite nanoparticles (NPs). Zn@ZnO core-shell (CS) nanocomposites, calcined ZnO, and Ag-doped ZnO (ZnO/Ag) nanostructures were prepared using pulsed laser ablation in liquid, calcination, and photodeposition methods, respectively, without using surfactants or catalysts. The as-prepared catalysts were characterized by using X-ray diffraction (XRD), field-emission scanning electron microscopy, high-resolution transmission electron microscopy, ultraviolet-visible (UV-vis) spectroscopy, and photoluminescence spectroscopy...
December 2018: Journal of Environmental Sciences (China)
Huimin Liang, Aijie Chen, Xuan Lai, Jia Liu, Junrong Wu, Yiyuan Kang, Xinying Wang, Longquan Shao
BACKGROUND: The extensive biological applications of zinc oxide nanoparticles (ZnO NPs) in stomatology have created serious concerns about their biotoxicity. In our previous study, ZnO NPs were confirmed to transfer to the central nervous system (CNS) via the taste nerve pathway and cause neurodegeneration after 30 days of tongue instillation. However, the potential adverse effects on the brain caused by tongue-instilled ZnO NPs are not fully known. METHODS: In this study, the biodistribution of Zn, cerebral histopathology and inflammatory responses were analysed after 30 days of ZnO NPs tongue instillation...
October 19, 2018: Particle and Fibre Toxicology
Diana Beatrice Visinescu, Mohammed Dyia Hussien, Raluca Negrea, Jose Maria Calderon-Moreno, Simona Schomi, Cristian Dumitru Ene, Ruxandra Barjega, Carmen Mariana Chifiriuc, Marcela Popa, Miruna Stan, Oana Carp
Two ZnO materials of spherical hierarchical morphologies, with hollow (ZnOHS) and solid cores (ZnOSS), were obtained through the hydrolysis of zinc acetylacetonate in 1,4-butanediol. The nature of the defects and surface reactivity for the two ZnO materials were investigated through photoluminescence (PL), X-ray photoelectron (XPS) and electronic paramagnetic resonance (EPR) spectroscopy proving the co-existence of shallow and deep defects and, also, the presence of polyol by-products adsorbed on the outer layers of the ZnO samples...
October 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ting Liu, Hongying Liang, Liangliang Liu, Yu Gong, Yanhuai Ding, Guochao Liao, Yi Cao
Exposure to ZnO nanoparticles (NPs) might modulate endoplasmic reticulum (ER) stress-autophagy gene expression, but the possible influence of hydrophobic surface coating on these responses was less studied. This study used A549-macrophage co-culture as the in vitro model for lung barrier and investigated the toxicity of pristine and hydrophobic ZnO NPs. Pristine and hydrophobic NPs exhibited different Zeta potential and solubility in water, which suggested that hydrophobic surface coating might alter the colloidal aspects of ZnO NPs...
October 16, 2018: Ecotoxicology and Environmental Safety
Heping Wang, Xuechen Gong, Xia Guo, Chun Liu, Yan-Ying Fan, Jin Zhang, Baolong Niu, Wenfeng Li
In this study, we fabricated a series of novel sodium alginate/ZnO hydrogel beads to optimize the release profile of curcumin (Cur) and to avoid the burst release associated with pure hydrogels, which were used to mitigate the weaknesses of Cur, such as rapid physiological clearance and sensitivity to ultraviolet (UV) light and alkaline solutions. The results show that the composite hydrogel beads exhibit good pH sensitivity and controlled-release capacity, which could prolong the residence time of Cur in the gastrointestinal tract...
October 16, 2018: International Journal of Biological Macromolecules
Xiao Liang, Shu-Mao Xu, Jun Zhang, Jing Li, Qi Shen
Tumor cells are vulnerable to reactive oxygen species (ROS). However, it is still a challenge to induce ROS efficiently in tumor cells. In this study, cascade amplifiers of intracellular ROS based on charge-reversible mitochondria-targeted ZnO-TPP@D/H nanorods were firstly developed for breast cancer therapy. The core-shell ZnO-TPP@D/H nanorod with particle size of 179.60 ± 5.67 nm was composed of a core of ZnO nanorod, an inner shell of triphenyl phosphonium (TPP), and an outer shell of heparin. DOX was loaded on ZnO-TPP@D/H nanorods with high drug loading efficiency of 22...
October 19, 2018: ACS Applied Materials & Interfaces
Yang Shen, Xiaodong Yang, Yue Bian, Kuiying Nie, Songmin Liu, Kun Tang, Rong Zhang, Youdou Zheng, Shulin Gu
In recent years, various kinds of ZnO-based core@shell nanomaterials have been paid much attention due to their widespread applications in the fields of physics, chemistry and energy conversion. In this work, the electronic and optical properties of a new type of ZnO-based one-dimensional core@shell nanostructure, which is composed of inner ZnO nanowire and outer carbon nanotube (CNT), is calculated based on the first-principles density functional theory (DFT). Calculation results suggest that the ZnO nanowire encapsulated in (9, 9)-CNT is the most stable structure from the view of formation energy...
October 18, 2018: Scientific Reports
Bo Qiu, Xiong-Feng Xu, Rong-Hui Deng, Gan-Qing Xia, Xi-Fu Shang, Pang-Hu Zhou
In the present work, flexible chitosan/ZnO nanocomposite films were prepared by a green and facile method through in situ precipitation of nano-ZnO (nZnO) in the chitosan film. Zn(Ac)2 was added in chitosan solution to provide Zn2+ , thus Zn2+ was fixed in the chitosan matrix and converted into nZnO through interaction with NaOH with heating. The structure and properties of the hybrid films were characterized by Field emission scanning electron microscope (FESEM), atomic force microscope (AFM), Fourier transform infra-red (FT-IR), X-ray diffraction (XRD) and tensile testing...
October 15, 2018: International Journal of Biological Macromolecules
Thomas Plehn, Dirk Ziemann, Volkhard May
A prototypical organic/inorganic interface is considered which is formed by vertical stacking of 20 para-sexiphenyl molecules physisorbed on a ZnO nano-cluster of 3903 atoms. Charge separation kinetics at the interface are investigated for their dependence on ultrafast optical excitation. In order to analyze the spatio-temporal evolution of the Frenkel exciton in the organic part and the formation of charge separated states a first principles parameterized Hamiltonian is introduced and the related time-dependent Schroedinger equation is solved...
October 18, 2018: Physical Chemistry Chemical Physics: PCCP
Wanli Gao, Hubert Perrot, Ozlem Sel
The mechanism of species fluxes during the charge-discharge process in a nanostructured ZnO electrode was studied by a combined methodology of electrochemical quartz-crystal microbalance (EQCM) and ac-electrogravimetry. Under the conditions of this study, anions (SO42-) possess the highest kinetics to be transferred at the electrode/electrolyte interface in the charge balance while cations (identified as Na+·5H2O and Na+) play the major role as charge carriers. Free H2O molecules present a sluggish behavior and their interfacial transfer occurs at a low scan rate or low frequencies...
October 18, 2018: Physical Chemistry Chemical Physics: PCCP
Huimin Liu, Hui Song, Wei Zhou, Xianguang Meng, Jinhua Ye
Searching for highly active and efficient photocatalysts for photo-induced/photo-assisted reactions is always the most challenging task for solar energy utilization. In previous studies, the search for such materials has mainly focused on precious plasmonic metals (Au, Ag, Cu, etc) and semiconductor oxides (TiO2, ZnO, WO3, etc). Here, we report the potential application of hexagonal tantalum mononitride (TaN) as optical support in photocatalytic reactions, which could harness visible light to assist CO2 conversion and decompose organic pollutants...
October 17, 2018: Angewandte Chemie
E Bartfai, K Nemeth, B El Mrabate, M Udayakumar, K Hernadi, Z Nemeth
Here we report the application of zinc oxide (ZnO) coated multi-walled carbon nanotube (MWCNT) composites in the photocatalytic decomposition of acetaldehyde (AA). Zinc oxide nanoparticles were successfully coated on the multi-walled carbon nanotube via impregnation process using zinc acetate (Zn(CH₃COO)₂×2H₂O) as precursor and sodium dodecyl sulfate (SDS) treated multiwalled carbon nanotube as raw material under different solvent conditions. The applied solvents during preparation were ethanol (EtOH) and water (H₂O)...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Tanujjal Bora, Joydeep Dutta
Silver-zinc oxide nanorods (Ag-ZnO NRs) and gold-zinc oxide nanorods (Au-ZnO NRs) plasmonic photocatalysts were fabricated by the deposition of Ag and Au nanoparticles on ZnO NRs. The photocatalysts were studied with electron microscopy, energy dispersive spectroscopy (EDS), UVvis optical absorption and photoluminescence spectroscopy. The effect of type of metals on the ZnO surface on its photocatalytic activity under ultra violet (UV) as well as visible light excitation are investigated and their contribution towards enhanced photo-generated charge separation in terms of the type of junction (Ohmic or Schottky) the metal forms with the semiconductor are explained...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Kousik Bhunia, Moumita Chandra, Debabrata Pradhan
This review focuses on the recent progress in shape-controlled synthesis and exposed facets-dependent catalytic properties of widely used nanostructured noble metals (Pd, Pt, and Au), bimetallic alloys involving one noble metal, and oxides of first row d-block elements such as titanium oxide (TiO₂), vanadium oxide (V₂O5 ), chromium oxide (Cr₂O₃), manganese oxide (MnO₂), iron oxide (Fe₂O₃), cobalt oxide (Co₃O₄), nickel oxide (NiO), copper oxide (Cu₂O), and zinc oxide (ZnO). The major emphasis is given on the role of shape-controlling agents and experimental parameters to control the exposed facets of the nanocrystals...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Petronela Pascariu, Ioan Valentin Tudose, Mirela Suchea
Structure, shape and surface morphology of the material are directly determined by the substrate and growth method used for material fabrication of nanostructured metal oxides. Those characteristics play a crucial role in the photocatalytic activity of the material. This paper presents a short review of some of the most recent relevant publications regarding pure and doped nanostructured metal oxides used for photocatalytic applications focusing on the structure, shape and surface morphology of the material effects on photocatalytic activity...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Li Gong, Yunzhen Liu, Fangyang Liu, Liangxing Jiang
Flexible Ga doped ZnO (GZO) transparent conductive thin films were prepared on polycarbonate (PC) substrates at room temperature by magnetron sputtering. The adhesive property between the GZO film and the PC substrate was investigated quantitatively by the scratch test, which is designed for the quantitative assessment of the mechanical integrity of coated surfaces. The effect of the sputtering pressures on the adhesion forces for the GZO films was investigated. When the sputtering pressure varied from 0.2 to 0...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Xianli Gu, Saisai Wang, Linlin Wang, Chun Wu, Kaibing Xu, Lingyu Zhao, Qi Liu, Mei Ding, Jingli Xu
In this work, three-dimensional (3D) TiO₂ nanotubes (NTs) on carbon cloth (CC) (TiO₂ NTs/CC) were synthesized by a method involving formation of a ZnO@TiO₂ nanorod (NRs) on CC (ZnO@TiO₂ NRs/CC) structure and a subsequent chemical etching process for ZnO NRs template. The 3D TiO₂ NTs/CC were applied as flexible anodes for sodium ion batteries (SIBs). The TiO₂ NTs/CC yielded high specific capacity and good cycling stability, superior to that of some reported TiO₂ nanocomposites. The TiO₂ NTs/CC delivered a reversible capacity of 260 mA·h·g-1 and 85...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Byung-Rok Yoon, Jae-Hyoung Park, Seung-Ki Lee
This paper presents a low frequency piezoelectric vibration energy harvester using ZnO nanowires on elastic interdigitated electrodes. The interdigitated electrodes are formed using electroplated Ni and have suspended parts at the edges that are elastic and deformable by applying external force. A spherical Ni ball is used as a proof mass, which transforms a low frequency mechanical vibration into the force applied to deform the elastic electrodes. The ZnO nanowires are grown selectively on the electrodes and can generate a piezoelectric potential when the elastic electrodes are deformed by the proof mass activated by the external mechanical vibration...
January 1, 2019: Journal of Nanoscience and Nanotechnology
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