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Pragya Singh, Li Lun Hu, Hsiao-Wen Zan, Tseung-Yuen Tseng
We successfully demonstrated a simple and low-cost nitric oxide (NO) gas sensor to deliver parts-per-billion (ppb) regime detection at room temperature operation. A vertical-channel ZnO nanorods resistor is fabricated by putting silver nanowire electrode onto the hydrothermal ZnO nanorods film. With suitable process condition, the nanorods film exhibits a uniform morphology to enable the formation of gas-permeable nanowire top electrode while also the nanorods provide good surface-to-volume ratio to deliver strong reaction with NO gas...
December 11, 2018: Nanotechnology
Soheila Davaeifar, Mohammad-Hossein Modarresi, Mehdi Mohammadi, Ehsan Hashemi, Morvarid Shafiei, Hadi Maleki, Hojatollah Vali, Hossein Shahbani Zahiri, Kambiz Akbari Noghabi
C-Phycocyanin pigment was purified from a native cyanobacterial strain using a novel consecutive multi-step procedure and utilized for the first time for the green synthesis of phycocyanin-zinc oxide nanorods (PHY-ZnO NRs) by a simple, low-cost and eco-friendly approach. The PHY-ZnO NRs were characterized using UV-vis spectroscopy, X-ray diffraction (XRD), zeta potential measurement, FTIR, SEM, TEM, differential scanning calorimetry (DSC), thermogravimetric (TGA), and EDX spectroscopy analysis. The UV-vis spectra showed an absorption band at 364 nm which is characteristic of ZnO nanoparticles (ZnONPs)...
December 4, 2018: Colloids and Surfaces. B, Biointerfaces
Anha Afrin Shefa, Mirana Taz, Monir Hossain, Yong Sik Kim, Sun Young Lee, Byong-Taek Lee
Lethal bleeding due to street accidents, natural calamities, orthopedic/dental surgeries, organ transplantation and household injuries, is the leading cause of morbidity and mortality. In the current study, zinc oxide (ZnO) was incorporated in TEMPO-oxidized cellulose nanofiber (TOCN) and polyethylene glycol (PEG) polymer system for hemorrhage control by freeze drying method. SEM and XRD data showed the presence of ZnO in the porous structure. FT-IR analysis showed that, successful conjugation occurs among the TOCN and PEG...
December 8, 2018: International Journal of Biological Macromolecules
Nam-Jung Kim, Jayeong Kim, Jun-Beom Park, Hyemin Kim, Gyu-Chul Yi, Seokhyun Yoon
We used high-quality ZnO nanostructures/graphene substrates for understanding the mechanisms of charge transfer (CT) that take place under nonplasmonic conditions. As the optimal conditions for CT processes are found, we studied the range of CT normal to the ZnO surface that is coated with nanoscale HfO2 layers with different thicknesses. We could observe that CT decays over a few nanometers. In addition, we also observed a unique oscillation of the SERS intensity in the atomically thin oxide layers, which reflects the quantum tunneling effects of CT electrons across the oxide layers...
December 10, 2018: Nanoscale
Myassar Alekish, Zuhair Bani Ismail, Borhan Albiss, Sara Nawasrah
Aim: The aim of the study was to evaluate the antibacterial effects of zinc oxide nanoparticles (ZnO-NPs) and its possible alternative use for the treatment for mastitis in sheep and to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of ZnO-NPs against multidrug-resistant Staphylococcus aureus and Escherichia coli strains isolated from subclinical mastitis cases in sheep. Materials and Methods: A total of 50 pooled milk samples were collected from ewes with subclinical mastitis...
November 2018: Veterinary World
Khalid Mahmood, Arshi Khalid, Muhammad Shahzad Zafar, Faisal Rehman, Madsar Hameed, Muhammad Taqi Mehran
A novel polymer-coated ZnO based bilayer electron transporting material is investigated for highly efficiency perovskite solar cells. The bilayer ETM consisting of an upper-layer of ZnO nanosheets and a lower-layer of ZnO nanoparticles demonstrates the averaged power conversion efficiency of 13.11% and a maximum power conversion efficiency of 15.13%, compared to single-layers of nanosheets (power conversion efficiency = 11.73%) and nanoparticles (power conversion efficiency = 11.08%) films. A conformal coating of a polymer such as polyethylenimine on the surface of bilayered film leading to a significant boost in power conversion efficiency upto 16...
December 3, 2018: Journal of Colloid and Interface Science
Sayed M Saleh
This novel work presents a promising application to use Zinc oxide nanospheres as nanocatalysts in photocatalytic degradation of methyl orange dye. The hydrothermal route was utilized in the synthesis process of ZnO nanospheres. The size of the synthesized ZnO nanoparticles is around 200-250 nm diameter. The synthesized nano-oxides were characterized utilizing several instruments such as X-ray diffraction, Brunauer, Emmett, and Teller (BET), and scanning electron microscope (SEM). The resulting nanoparticles are utilized as an efficient tool for degradation of methyl orange (MO) dye under UV radiation...
December 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Rakesh K Sonker, B C Yadav, Vinay Gupta, Monika Tomar
The present paper reports the in-situ chemical polymerization of nanocomposites thin film composed by titanium dioxide (TiO2 ), zinc oxide (ZnO) and polyaniline (PANI). It was found that nanocomposites sensor is highly selective and shows response to low concentration. To improve the sensing response characteristics of ZT thin film, PANI is incorporated. Thin film based LPG sensor of ZnO-TiO2 -PANI composite was fabricated by spin coating of ZnO-TiO2 nanoparticles doped with PANI over inter digital electrodes (IDEs)...
October 7, 2018: Journal of Hazardous Materials
Rajashree H Jawale, Parag R Gogate
Significant development in the industrial technologies and applications based on the use of cyanide derivatives has also led to significant environmental problems critically needing research in developing new technologies for effluent treatment. Present study investigates the use of novel treatment approach of hydrodynamic cavitation (HC) combined with chemical oxidation and catalyst for the degradation of Potassium Thiocyante (KSCN) for the first time. The effect of operating pressure (over the range of 2-5 bar) and initial pH (over the range of 2-7...
November 22, 2018: Ultrasonics Sonochemistry
Michelle Gervasio, Kathy Lu
Creation of high quality and novel polymer-particle nanocomposites to a large extent depends on understanding the behaviors of individual polymer chains and particles, especially at the mixing state in a liquid solvent. Simulations can help identify critical parameters and equations that govern the suspension behaviors. This study is the first attempt to understand the agglomeration processes of ZnO nanoparticle and PMMA polymer co-suspensions through a constant number Monte Carlo simulation. A modified DLVO theory is used to describe the particle-particle interactions that lead to agglomeration...
December 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ruihao Chen, Jing Cao, Yuan Duan, Yong Hui, Tracy T Chuong, Daohui Ou, Faming Han, Fangwen Cheng, Xiaofeng Huang, Binghui Wu, Nanfeng Zheng
Perovskite solar cells (PSCs) have reached certified efficiencies of up to 23.3% but suffered from frailness and instability when exposed to ambient atmosphere. Zinc oxide (ZnO), when used as electron transport layer (ETL) on PSCs, gives rise to excellent electronic, optic and photonic properties, yet the Lewis basic nature of ZnO surface leads to deprotonation of the perovskite layer, resulting in serious degradation of PSCs using ZnO as ETL. Here, we report a simple but effective strategy to convert ZnO surface into ZnS at the ZnO/perovskite interface by sulfida-tion...
December 10, 2018: Journal of the American Chemical Society
Marco Laurenti, Andrea Lamberti, Giada Graziana Genchi, Ignazio Roppolo, Giancarlo Canavese, Chiara Vitale Brovarone, Gianni Ciofani, Valentina Cauda
Mesoporous zinc oxide (ZnO) scaffolds coated by drop-casted graphene oxide (GO) flakes are proposed as a novel bilayer system featuring bioactivity, biocompatibility and promising loading/release properties for controlled drug-delivery systems. The high-surface area ZnO scaffolds shows clear apatite deposition but the particular surface chemistry and topography prevent the formation of a continuous coating, resulting in micrometric crystalline apatite aggregates after 28 days in simulated body fluid (SBF). When gentamicin sulfate (GS) is considered as a model molecule, the pure ZnO scaffolds also show functional GS loading efficiency, with fast in vitro release kinetics driven by simple diffusion mechanism...
December 11, 2018: ACS Applied Materials & Interfaces
Gitae Namgung, Qui T H Ta, Woochul Yang, Jin-Seo Noh
A crystal-damage-free nano-doping method, which utilized the vacuum drive-in diffusion of Al into ZnO nanorods, was developed. In this method, vertical ZnO nanorod arrays that were grown by chemical bath deposition beforehand were deposited with Al thin film and subsequently heat-treated under a high vacuum. At an optimum condition, the surface Al atoms were completely diffused into ZnO nanorods, resulting in Al-doped ZnO nanorods. Stretchable gas sensors were fabricated by sequentially drop-casting Al-doped ZnO nanorods and silver nanowires on PDMS substrate...
December 7, 2018: ACS Applied Materials & Interfaces
Essouassi Elikem, Brian D Laird, Jordan Hamilton, Katherine Stewart, Steven D Siciliano, Derek Peak
Previous studies have suggested that understanding soil metal speciation, rather than relying solely on total metal content, can improve the accuracy and utility of contaminated site risk assessments. Since soil properties and reaction time can alter metal speciation, then speciation should influence metal bioaccessibility. For example, under gastrointestinal conditions, it is expected that metal species will differ in bioaccessibility depending upon their stability in acidic pH environments. We studied the links between metal speciation and bioaccessibility...
December 7, 2018: Environmental Toxicology and Chemistry
Ho Viet Thang, Gianfranco Pacchioni
The effect of doping with group-III metals (Al, Ga and In) and Cu free standing and Cu(111) supported ZnO bilayer films has been investigated computationally by using the DFT+U method including dispersion contributions. The changes in the electronic properties of doped ZnO and ZnO/Cu(111) films have been tested by adsorbing CO probe molecules. The replacement of a lattice Zn ion in a free-standing ZnO bilayer by a group-III element generates an extra electron whose distribution depends on the dopant. In particular, while the excess electron is delocalized over the conduction band for Al or Ga doping, it is localized on the dopant in the case of In...
December 7, 2018: Physical Chemistry Chemical Physics: PCCP
Nandang Mufti, Siti Maryam, Anggun A Fibriyanti, Robi Kurniawan, Abdulloh Fuad, Ahmad Taufiq, Sunaryono
We report on the effect of the morphological modification on optical properties and polarization of ZnO nanorods (NR). Here, the morphology and structure of the ZnO NR were modified by introducing different annealing temperatures. The increase of length and diameter and change in density of the ZnO NR were clearly observed by increasing the annealing temperature. We found that the samples show different oxygen vacancy (VO ) and zinc interstitial (ZnI ) concentrations. We suggest that the different concentrations of VO and ZnI are originated from morphological and structural modification...
2018: Scanning
Rong Liu, Renzheng Qiu, Taoyu Zou, Chuan Liu, Jun Chen, Qing Dai, Shengdong Zhang, Hang Zhou
Electron transport layer (ETL) plays an important role in realizing efficient and stable perovskite solar cells. There are continuous efforts in developing new types of low cost ETLs with improved conductivity and compatibility with perovskite and the conducting electrode. Here, in order to obtain high efficient and stable perovskite solar cells on ZnO: Al (AZO) substrate, reduced graphene oxide (rGO) is incorporated into SnO2 nanoparticles to form composite ETL. For planar perovskite solar cell on AZO substrates, SnO2-rGO with a low incorporation ratio of 3wt% rGO significantly enhances the device short circuit current density (Jsc) and the fill factor (FF) when compared to the device with pristine SnO2 ETL, leading to an overall power conversion efficiency (PCE) of 16...
November 21, 2018: Nanotechnology
Haifen Xie, Fan Ding, Haichuan Mu
Au doped ZnO nanocomposites on TiO2 seeding layer (AuZ/T) were fabricated by hydrothermal processing and their photocatalytic performance was investigated. It could be found that the AuZ/T with m-sized, lying ZnO bulks revealed optimal photocatalytic performance toward methyl orange (MO) under simulated sunlight, whose apparent degradation rate constant Kapp of 1.31 was about 20% higher compared to that of ZnO/TiO2 and 3 times higher compared to that of ZnO. The Au nanoparticles, TiO2 seeding layer and hydrothermal processing time imposed vital influence on the morphology of ZnO nanostructures, which played key roles in the formation of ZnO/TiO2 pn heterojunction and charge transfer (CT) inside it, as demonstrated by kinetics of transient photoluminescence (PL) decaying...
November 16, 2018: Nanotechnology
Qianqian Du, Shuchao Qin, WenJun Wang, Yangyang Guo, Jiandong Ye, Shunming Zhu, Kun Tang, Rong Zhang, Youdou Zheng, Shulin Gu
ZnO nanowire photodetectors have attracted much attention due to their excellent optoelectronic performances. However, the operating speed remains a challenge, and the scalability is also impeded by the uncontrolled transfer methods and sophisticated fabrication process. In this paper, we have fabricated an excellent ZnO nanobridge ultraviolet photodetector array by using a simple one-step method. The faster photoresponse speed and a broader response wavelength (from UV to visible range) have been achieved by constructing a type-II ZnO/rubrene heterointerface...
November 19, 2018: Nanotechnology
Daniele Conti, Marco Laurenti, Samuele Porro, Cecilia Giovinazzo, Stefano Bianco, Vittorio Fra, Alessandro Chiolerio, Candido Fabrizio Pirri, Gianluca Milano, Carlo Ricciardi
Resistive switching devices are considered as the most promising alternative to conventional random access memories. They interestingly offer effective properties in terms of device scalability, low power-consumption, high read/write operation time, endurance and state retention. Moreover, neuromorphic circuits and synapse-like devices are envisaged with resistive switching modeled as memristors, opening the route toward beyond-Von Neumann computing architectures and intelligent systems. This work investigates how the resistive switching properties of zinc oxide thin films are related to both sputtering deposition process and device configuration, i...
November 20, 2018: Nanotechnology
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