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Electrochemically deposited nanostructured ZnO layers on ...

Spectra of diffuse reflectance (a), specular reflection (b) and haze ratio in reflection (c) in visible region of ZnO electrochemical thin films deposited on textured Si-solar cells with ITO (type 1). The ZnO layers are deposited for different time. Fig. 4.

FTIR and Raman Spectroscopy of Carbon Nanoparticles in ...

Oct 01, 2008· Experimental. The C–SiO 2, C–ZnO and C–NiO samples were prepared by sol–gel techniques whose details are presented elsewhere [6,7].FTIR reflectance spectroscopy studies were performed on the samples using a Bomem DA8 spectrometer in the near infrared and the infrared wavelength ranges (2.5–20 μm) and a Lambda 900 spectrophotometer in the ultraviolet and visible …

Synthesis and Characterization of Manganese Doped ZnO ...

Optical properties; Nanoparticles g 1. INTRODUCTION ZnO is a II-VI semiconductor with wide direct-gap (3.37 eV) and exciton binding energy (60 meV) at room temperature [1]. It is an inexpensive and environmentally safe host material. Due to its properties, the interest in ZnO as a

Selective antibacterial effects of mixed ZnMgO nanoparticles

Apr 06, 2013· Room temperature diffuse reflectance UV/Vis spectra of ZnO (green), MgO (blue), and ZnMgO (red) nanoparticles Antibacterial effects of ZnO, MgO, and ZnMgO nanoparticles First, we tested the antimicrobial activities of nanoparticles at different concentrations (0.001—1 mg/mL) against E. coli and B. subtilis in LB medium (data not shown).

Structural, diffused reflectance and photoluminescence ...

The reflectance data reported as F(R) values have been obtained by application of the Kubelka–Munk.The bandgap energies of undoped and Ce doped ZnO has been deduced from the Tauc plot, shown in Fig. 3 is the plot of [F(R)hυ] 2 versus photon energy (hυ).The extrapolation of the rising segment of [F(R)hυ] 2 to the abscissa at zero F(R) provides the band gap energies.

Near Infrared Reflectance Properties of Metal Oxide ...

Powders of nanocrystalline metal oxides were compared with common macrocrystalline powders and minerals for their ability to reflect near-infrared light (NIR) (750−2500 nm). The nanocrystalline metal oxides were found to possess higher NIR reflectance values (∼15−20%) and this can be attributed to their smaller crystallite sizes coupled with smaller mean aggregate sizes in accordance ...

Zinc oxide - Wikipedia

Zinc oxide is an inorganic compound with the formula Zn O.ZnO is a white powder that is insoluble in water, and due to its Broad Spectrum UV, anti-bacterial, and anti-viral properites, is used as an additive in numerous materials and products including sunscreens, oral care products, vitamin,s rubbers, plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, sealants ...

Near IR reflectance characteristics of PMMA/ZnO ...

The diffuse reflectance data, without including the specular reflectance, given by the instrument SHIMADZU UV–vis–NIR spectrophotometer [UV-3600] in the wavelength region 800–2500 nm is directly plotted for the PMMA films which were prepared with only 0.1 wt% ZnO particles.

The identification of hydroxyl groups on ZnO nanoparticles ...

The interaction of water with ZnO nanoparticles has been studied by means of diffuse reflectance infrared spectroscopy (DRIFTS) and ultra-high vacuum FTIR spectroscopy (UHV-FTIRS). Exposing clean ZnO powder to water at 323 K leads to both molecular and dissociative adsorption of H 2 O forming a number of hydroxyl species. All the OH bands are clearly identified by the adsorption of D 2 O ...

Room-temperature synthesis of zinc oxide nanoparticles in ...

Cyanide is an extreme hazard and extensively found in the wastes of refinery, coke plant, and metal plating industries. A simple, fast, cost-effective, room-temperature wet chemical route, based on cyclohexylamine, for synthesizing zinc oxide nanoparticles in aqueous and enthanolic media was established and tested for the photodegradation of cyanide ions.

JOURNAL OF OPTOELECTRONICS AND ADVANCED …

Specular reflectance of the ZnO thin film was measured at a wavelength range of 200–2400 nm, using a double-beam UV–Vis–NIR spectrophotometer with a Cary 5000. We had two apparatus called ...

Selective Cytotoxic Effect of ZnO Nanoparticles on Glioma ...

Selective Cytotoxic Effect of ZnO Nanoparticles on Glioma Cells Stella Ostrovsky 1, Gila Kazimirsky2, Aharon Gedanken ( ), and Chaya Brodie2 1 Department of Chemistry and Kanbar Laboratory for Nanomaterials at the Bar-Ilan University Center for Advanced Materials and Nanotechnology, Bar-Ilan University, Ramat-Gan 52900, Israel

Synthesis, characterization and optical properties of zinc ...

May 07, 2013· Zinc oxide nanoparticles were synthesized using a simple precipitation method with zinc sulfate and sodium hydroxide as starting materials. The synthesized sample was calcined at different temperatures for 2 h. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and proton-induced X-ray emission (PIXE) …

Specular Reflectance Standard, High Reflectivity

Product Description. The STAN-SSH High-reflectivity Specular Reflectance Standard is a mirrored, fused-silica standard that can be used as a reference when measuring surfaces with high specular reflectance values such as optical substrates, optical coatings, …

Specular Reflection – PIKE Technologies

Specular reflection is an excellent sampling technique for measurement of thin films on reflective substrates and for non-invasive analysis of samples. PIKE Technologies offers several versions of specular reflection accessories to address applications from research to quality control.

Photocatalytic degradation and heat reflectance recovery ...

This work aims to clarify the photocatalytic degradation mechanism and heat reflectance recovery performance of waterborne acrylic polymer/ZnO nanocomposite coating. To fabricate the nanocomposite coating, ZnO nanoparticles (nano‐ZnO) were dispersed into acrylic polymer matrix at the various concentrations from 1 to 6% (by total weight of ...

Specular Reflectance Measurements with Spheres

Nov 12, 2013· Four sample types that span a wide range of specular reflectance intensities were investigated. A piece of polished aluminum represents high reflectance (around 90%R), a wafer of silica has medium reflectance (around 50%R), and a piece of dark glass as well as a clear glass slab with back side protection represent low reflectors (around 4%R).

ORIGINAL ARTICLE Open Access Synthesis, characterization ...

ORIGINAL ARTICLE Open Access Synthesis, characterization and optical properties of zinc oxide nanoparticles Surabhi Siva Kumar1*, Putcha Venkateswarlu2, Vanka Ranga Rao3 and Gollapalli Nageswara Rao4 Abstract Zinc oxide nanoparticles were synthesized using a simple precipitation method with zinc sulfate and sodium

Nanoparticles in Block-Copolymer Films Studied by Specular ...

Specular reflection and off-specular neutron scattering were applied to determine the distribution of magnetite Fe 3 O 4 nanoparticles in a symmetric P(Sd-b-BMA) film with a concentration of the nanoparticles of 7% of the volume fraction. From the experiments on neutron specular reflection and off-specular scattering, we obtained information ...

3. What are the properties of ZnO nanoparticles?

For all ZnO preparations, the number distribution results show that 90% of the particles have a size below 100 nm, whereas for the weight distribution the percentage of particles with a size below 100 nm varies (ZnO A d75, ZnO B d75, ZnO C d25, ZnO D d90).

ZnO Nanoparticle-Modified Infrared Internal Reflection ...

An annealing method was developed to modify ZnO nanoparticles directly onto the surface of an IR internal reflection element. The ZnO nanoparticles produced this way are spherical (diameters, ∼20 nm). When this modified sensing element was used to detect VOCs, intense IR signals for compounds bearing polar functional groups were observed.

Understanding the UV-Vis Spectroscopy for Nanoparticles ...

ZnO nano particles To examine the optical properties of nanoparticles UV-Vis spectroscopy is used. In Figure 4, ZnO nanoparticles spectrum is observed in the figure characteristic absorption peak of the sample is noted that is 376 nm and band gap is 3.26 eV.

A review of near infrared reflectance properties of metal ...

two types of reflection: specular reflection and diffuse reflection. Specular reflection is significant for optically smooth surfaces and for highly absorbing samples. Diffuse reflection occurs when the incident radiation penetrates into the powder and gets reflected by grain boundaries of the particles.