نتایج جستجو برای: field emission microscopy

تعداد نتایج: 1116812  

Journal: Journal of Nanoanalysis 2018
Ali Reza Mahjoob Maryam Kargar Razi, Morteza Khosravi Sara Poorarjmand

Photocatalysis has attracted significant attention as a potential issue for the degradation of toxic organic pollutants such as Congo Red. In this research spherical Pure ZnO nano particles and Ni-Co-ZnO nano composites (Zn0.95Ni0.04Co0.01O,  Zn0.95Ni0.025Co0.025O and  Zn0.95Ni0.01Co0.04O) have been synthesized by precipitation method. X- ray diffraction, Fourier transform Infra Red ,field emis...

Journal: :iranian journal of catalysis 0
seyed reza azimi pirsaraei department of occupational health engineering, faculty of medical sciences, tarbiat modares university, p.o. box: 14115-111, tehran, iran. hasan asilian mahabadi department of occupational health engineering, faculty of medical sciences, tarbiat modares university, p.o. box: 14115-111, tehran, iran. ahmad jonidi jafari research center for environmental health technology, iran university of medical sciences, p.o box: 14665-354, tehran, iran.

the catalytic oxidation of toluene over copper oxide supported on natural diatomite was investigated. the catalyst was prepared by the wet impregnation method and characterized by using the brunauer emmett teller (bet), field emission scanning electron microscopy (fesem), x-ray diffraction (xrd), x-ray fluorescence (xrf) and temperature-programmed reduction (tpr) analysis. the highest catalytic ...

2005
Y. Y. Wang S. Gupta J. M. Garguilo Z. J. Liu L. C. Qin R. J. Nemanich

Vertically aligned carbon nanotube films with diameters smaller than 5 nm, high densities up to 10/cm, and lengths of ~ 5–8 Am were deposited by microwave plasma-assisted chemical vapor deposition. Experiments show that, by continuous reduction in the thickness of the iron film (i.e., ~0.3–0.5 nm), small diameter carbon nanotubes can be achieved with diameters that ranged from 1–5 nm, and the f...

Journal: :international journal of nanoscience and nanotechnology 2015
z. kazemizadeh z. bahrami a. khodadadi f. nazari

cobalt chromite (cocr2o4) with normal spinel structure, shows catalytic activity for oxidation of unburned methane in the natural gas vehilcles (ngv). in this study, cocr2o4 nanoparticles were synthesized through a conventional co-precipitation technique and investigated for the catalytic combustion of methane. cobalt nitrate hexahydrate, chromium nitrate nonahydrate and ammonia solution (25%) ...

Journal: :ACS nano 2012
Melari Davies Angela Wochnik Florian Feil Christophe Jung Christoph Bräuchle Christina Scheu Jens Michaelis

We investigated silver nanowires using correlative wide-field fluorescence and transmission electron microscopy. In the wide-field fluorescence images, synchronous emission from different distinct positions along the silver nanowires was observed. The sites of emission were separated spatially by up to several micrometers. Nanowires emitting in such cooperative manner were then also investigate...

2010
Wen-Pin Wang Hua-Chiang Wen Sheng-Rui Jian Huy-Zu Cheng Jason Shian-Ching Jang Jenh-Yih Juang Huang-Chung Cheng Chang-Pin Chou

The field emission characteristics of carbon nanotubes (CNTs) grown by thermal chemical vapor deposition (CVD) and subsequently surface treated by high-density Ar plasma in an inductively coupled plasma reactive ion etching (ICP-RIE) with the various plasma powers were measured. Results indicate that, after treated by Ar plasma with power between 250 and 500 W, the emission current density of t...

Journal: :ACS applied materials & interfaces 2012
Neeraj Dwivedi Sushil Kumar R K Tripathi J D Carey Hitendra K Malik M K Dalai

The origin of low threshold field-emission (threshold field 1.25 V/μm) in nanocrystalline diamond-like carbon (nc-DLC) thin films is examined. The introduction of nitrogen and thermal annealing are both observed to change the threshold field and these changes are correlated with changes to the film microstructure. A range of different techniques including micro-Raman and infrared spectroscopy, ...

Journal: :journal of nanostructures 2014
m. riazian

structural properties and chemical composition change the photocatalytic activity in tio2-sio2 nanopowder composite. the sio2-tio2 nanostructure is synthesized based on sol–gel method. the nanoparticles are characterized by x-ray fluorescents (xrf), x- ray diffraction (xrd), tunneling electron microscopy (tem), field emission scanning electron microscopy (fe-sem), uv-vis. spectrophotometer and ...

Journal: :international journal of bio-inorganic hybrid nanomaterials 0

sphere-like shaped cobalt oxide nanoparticles (co3o4) were synthesized by a simple wet chemical method using cobalt chloride as precursor and cetyl trimethylammonium bromide (ctab) as surfactant. their structural and surface morphologial properties were characterized by high resolution transmission electron microscopy (hrtem), field emission scanning electron microscopy (fesem) and x-ray diffra...

2008
E. Y. Matsubara J. M. Rosolen Ravi P. Silva

In this work, the electron field emission behaviour of electrodes formed by carbon nanotubes CNTs grown onto monolithic vitreous carbon VCarbon substrates with microcavities is presented. Scanning electron microscopy was used to characterize the microstructure of the films. Tungsten probes, stainless steel sphere, and phosphor electrodes were employed in the electron field emission study. The C...

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