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A highly sensitive and stable L-Lactate sensor based on the synergic action of multi-wall carbon nanotube (MWCNTs) and ZnO nanoparticles has been developed. The unique sandwich-like layer structure (PDDA/LOD/ZnO/MWCNTs) provides a favorable microenvironment to keep the bioactivity of LOD and prevent enzyme molecule leakage. Therefore, the proposed L-Lactate biosensor exhibited good analytical performances...
We present the comprehensive characterization of several experimental ZnO:Al films for thin film solar cell applications. The morphological and optical properties of these films are determined using traditional and new, experimental measurement techniques and results are compared to those of the commercial Asahi U-type TCO as well as samples of planar TCOs coated in silver nanoparticles. Results show...
In this study, we investigated the antibacterial activity of ZnO films prepared in University of Leeds in England, against microbial contamination in paddy, brown and white rice, particularly contaminated with mesophilic bacteria and coliforms. The results showed that reduction numbers of coliforms in paddy, brown and white rice treated with ZnO films were 0.30 logCFU/g, 0.14 logCFU/g and 0.21 logCFU/g,...
Pure ZnO, pure MgO and 5 wt%MgO/ZnO nanocomposites were produced by flame spray pyrolysis (FSP) in a single step using zinc naphthenate and magnesium acetate tetrahydrate as Zn and Mg precursors. The particle properties were analyzed by XRD, BET and TEM analyses. The sensing films were prepared by mixing the nanoparticles into an organic paste composed of ethyl cellulose and terpineol as a vehicle...
We present a novel structure of the ZnO thin-film with high haze value. The thin-film was composed by appropriate amount of ZnO nanoparticle, ZnO hollow nanoparticle and ZnO sol-gel annealed at 500??C for 1 h. Therefore, the ZnO and ZnO hollow nanoparticle can be well-bounded in the ZnO thin-film. In this experiment, the haze of novel ZnO thin films are over 80% in visible range. It will be used for...
High dispersion of nanoparticles in transparent polymer matrices is the prerequisite to maintain the transparency of matrices. However, it is hard to fabricate the nancomposites with high visible light transmittance even at low nanoparticle concentrations. In this work, highly transparent Polyvinyl Butyral (PVB)/ZnO nanocomposites were fabricated by using the two-step process. Firstly, the monodispersed...
For the preparation of printable devices based on ZnO nanoparticles (ZnO NP), stable colloidal dispersions of these materials are highly desirable. ZnO NP have been synthesized by chemical vapor synthesis. The particles have a spherical shape with a narrow size distribution. Stable aqueous dispersions of the ZnO NP have been successfully prepared after the addition of a polymeric stabilizer. The prepared...
The flame-made (5/5) pure ZnO and WO3-doped ZnO nanoparticles containing 0.25, 0.50, and 0.75 mol% of WO3 were successfully synthesized by flame spray pyrolysis (FSP). These materials were studied for NO2, CO and H2 gas sensing at different gas concentrations and operating temperatures ranging from 300-400??C in dry air. The crystalline phase, morphology and size of the nanoparticles were characterized...
As we know, the unsatisfactory field emission from the films by electrophoresis is resulted from the weak adhesion. The main aim of this paper is to improve the adhesion surrounding electrophoresis technologies. In addition, A simple controllable method is reported for the coating of ZnO nanowires with Ag nanoparticles and ZnO/Carbon nanotubes (CNT) composite.
A surface-conducted field emission cathode with zinc oxide nanotetrapod and nanoparticle with high secondary electron yield is developed in this study. Low-magnification scanning electron microscopy and diode testing are used to characterize the emitter.
As we know, the unsatisfactory field emission from the films by electrophoresis is resulted from the weak adhesion. The main aim of this paper is to improve the adhesion surrounding electrophoresis technologies. The technique we applied is referred to employ both organic binders and inorganic solution simultaneously. In addition, the influences of the applied voltage, inter-electrode distance and...
We proposed and demonstrated warm white light generating combinations of semiconductor nanocrystal quantum dot emitters with high photometric quality including high color rendering index (~80) on LED platforms to meet requirements of future lighting. Additionally, we developed and demonstrated of these nanocrystal luminophors with metal nanoparticles to control and enhance their spontaneous emission...
In this work, we review our progress developing techniques for printing transparent transistors using various routes to realize solution-processed zinc oxide. We demonstrate printable ZnO inks based on ZnO nanoparticles, and realize transistors using this material as the channel. Additionally, we demonstrate a novel process for fabricating ZnO devices using chemical bath deposition. Pre-patterning...
Zinc oxide (ZnO) nanoparticles is an attractive candidate and gain attention for their novel properties and promising applications such as optoelectronic devices by virtue of their high surface to volume ratio and molecular absorption and desorption characteristics. Ultraviolet light emmiters, gas sensor (particularly for hydrogen) etc. are some of the potential applications of this wide direct band...
Hybrid films consisting of ZnO nanoparticles and organic matrices were fabricated at particle concentration levels of up to 60 wt%. The correlation between the refractive index and optical transmittance in the visible light region was investigated. The refractive index of the hybrid films was modified in a continuous manner in the range from 1.44 to 1.55. The refractive index increased linearly as...
Improvement of dye sensitized solar cell was investigated using methyl-violet dye and nanocrystalline ZnO thin film electrodes. A low cost fabrication method and low cost materials were used to prepare this photocell. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the microstructure and surface properties of dye coated ZnO electrodes. According to the...
Nano-sized powders of transparent conductive aluminum-doped zinc oxide (AZO) have been successfully prepared by electrolysis-modified co-precipitation method. By adding ammonium hydroxide into the precursor solution prepared by electrolytic dissolution of zinc metal in a buffered electrolyte solution of nitric acid and ammonium nitrate with adequate addition of aluminum nitrate, co-precipitate precursors...
We report the visible light emission of organic-inorganic light emitting devices by low-cost spin-coating. Different nanoparticles, CdSe, ZnO and Eu2O3, are employed to form organic-inorganic hybrid composites and generate the R-G-B and white light emission, while N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) and polymethyl methacrylate (PMMA) are adopted as the organic matrices...
ZnSe nanoparticles embedded in SiO2 thin films were prepared by sol-gel method using zinc acetate dihydrate, selenic acid and TEOS as source materials. The ZnSe nanoparticles/SiO2 thin film composites were deposited on the glass substrate by dip coating technique. FESEM images show that morphology of embedded ZnSe nanoparticles affected by ZnSe/SiO2 molar ratio. The optical properties of thin film...
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