Nitrogen Doped
Mostrando 13-20 de 20 artigos, teses e dissertações.
-
13. Redução catalítica seletiva de óxidos de nitrogênio sobre hematita contendo cobre
The activity of copper-doped hematite in the SCR with propane, in the presence of oxygen, was evaluated in this work. It was found that copper sulfate led to the production of solids with different specific surface areas depending on the amount of copper. The sulfur and copper species were mainly located on the surface. The copper-containing catalysts were m
Química Nova. Publicado em: 2007-06
-
14. Influence of ion nitriding process on the properties of zirconia coating deposited on stainless steel
ZrO2-3 mol % Y2O3-coated AISI 310 stainless steel was nitrided using plasma produced by dc pulsed discharge in a mixture of N2 and H2 at an equilibrium temperature of 450ºC. Profile chemical analyses with GDOS (glow discharge optical spectroscopy) and XRD showed the formation of Nitrogen/Y-ZrO2 solid solution. Nitrogen atoms enter in the zirconia substituti
Brazilian Journal of Physics. Publicado em: 2006-09
-
15. Contribuição para a sintese de diamante com dopagens de boro, nitrogenio ou enxofre / Study of diamond doping with boron, sulphur and nitrogen
We studied the diamond doping processes with introduction of doping impurities during the diamond growth in the chemical vapor deposition (CVD) technique, using a hot-filament reactor. Our research focused the use of boron, nitrogen or sulphur atoms in order to obtain diamond films with semiconductor properties of electronic (n-type) or hole (p-type) current
Publicado em: 2004
-
16. Layered Niobates: Synthesis, characterization, reactivity and luminescenece properties study / Niobatos lamelares: síntese, caracterização, reatividade e estudo das propriedades luminescentes
The study described in this Thesis is related to the synthesis and evaluation of some chemical properties of layered niobates with formulas K4Nb6O17 (hexaniobate), KNb3O8 (triniobate) and K1-xLnxCa2-xNb3O10 (layered perovskites - Ln = La, Eu and x = 0.02; 0.25; 0.50; 0.75 and 1.00). These niobates are constituted of negative layers and an interlayer region f
Publicado em: 2003
-
17. Sintese da polianilina em escala piloto e seu processamento
The interest in polyaniline (PAni) comes from the fact that polymers obtained from aromatic derivatives containing nitrogen linked to the ring can be easily synthesized and each derivative may exist jn several distinct oxidation states, also they can be "doped" by different dopants by non redox, as well as by partial chemical or electrochemical oxidation. Th
Publicado em: 2000
-
18. Dopagem tipo-n e mudanças estruturais induzidas pelo nitrogenio de filmes de germanio amorfo hidrogenado
In this work several informations are presented and discussed about structura1 and optoelectronic properties of doped samples of hydrogenated amorphous germanium (a-Ge:H) using P, As (solid sources) and N (using NH3) as doping impurities. In addition, we studied structura1 changes of a-Ge:H induced by N, in the nitrogen concentration range of ~2-6 at. %. The
Publicado em: 1998
-
19. Nitrogenio como um dopante em filmes de a-Ge: H
This work presents experimental data referring to the electrical and optical properties of nitrogen-doped hydrogenated and un-hydrogenated amorphous germanium (a-Ge) films of improved quality. It is shown that the inclusion of minute amounts of nitrogen atoms in the a-Ge network produces important changes in the opto-electronic properties in the material. Th
Publicado em: 1991
-
20. Fotocondutividade no nitreto de silicio amorfo hidrogenado não estiquiometrico
The off-stoichiometric amorphous hydrogenated silicon nitride (a-SiNx:H) has been studied in the last few years due to its possible applications in photovoltaic devices in many laboratories in the world. In the present work we present the results of measurements of photoconductivity versus temperature and light intensity in material prepared by glow discharg
Publicado em: 1985