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Heszler, Peter
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Publikasjoner (10 av 20) Visa alla publikasjoner
Landström, L., Elihn, K., Boman, M., Granqvist, C. & Heszler, P. (2005). Analysis of thermal radiation from laser-heated nanoparticles formed by laser-induced decomposition of ferrocene. Applied Physics A, 81, 827-833
Åpne denne publikasjonen i ny fane eller vindu >>Analysis of thermal radiation from laser-heated nanoparticles formed by laser-induced decomposition of ferrocene
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2005 (engelsk)Inngår i: Applied Physics A, ISSN 1432-0630, Vol. 81, s. 827-833Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Thermal radiation, originating from laser-heated gas-phase nanoparticles, was detected in the 400–700 nm wavelength range by means of optical emission spectroscopy. The particles were formed upon laser-induced photolytic decomposition of ferrocene (Fe(C5H5)2) and consisted of an iron core surrounded by a carbon shell. The laser-induced excitation was performed as the particles were still within the reactor zone, and the temperature of the particles could be determined from thermal emission. Both the temperature of the nanoparticles and the relative intensity changes of the emission were monitored as a function of time (with respect to the laser pulse), laser fluence and Ar ambient pressure. At high laser fluences, the particles reached high temperatures, and evidence was found for boiling of iron. Modeling of possible energy-releasing mechanisms such as black-body radiation, thermionic electron emission, evaporation and heat transfer by the ambient gas was also performed. The dominant cooling mechanisms at different ranges of temperature were clarified, together with a determination of the accommodation factor for the Ar–nanoparticle collisions. The strong evaporation at elevated temperatures also led to significant iron loss from the produced particles.

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Identifikatorer
urn:nbn:se:uu:diva-74244 (URN)doi:10.1007/s00339-005-3284-3 (DOI)
Tilgjengelig fra: 2006-03-08 Laget: 2006-03-08 Sist oppdatert: 2011-01-11
Mechler, A., Kopniczky, J., Kokavecz, J., Hoels, A., Granqvist, C. G. & Heszler, P. (2005). Anomalies in Nanostructure Size Measurements by AFM. Phys. Rev., B 72, 125407 (1-6)
Åpne denne publikasjonen i ny fane eller vindu >>Anomalies in Nanostructure Size Measurements by AFM
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2005 (engelsk)Inngår i: Phys. Rev., Vol. B 72, s. 125407 (1-6)Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:uu:diva-76865 (URN)
Tilgjengelig fra: 2006-03-08 Laget: 2006-03-08 Sist oppdatert: 2011-01-11
Ionescu, R., Hoel, A., Granqvist, C., Llobet, E. & Heszler, P. (2005). Ethanol and H2S Gas Detection in Air and in Reducing and Oxidizing Ambience: Application of Pattern Recognition to Analyze the Output from Temperature-Modulated Nanoparticulate WO3 Gas Sensors. Sensors Actuators, B 104, 124-131
Åpne denne publikasjonen i ny fane eller vindu >>Ethanol and H2S Gas Detection in Air and in Reducing and Oxidizing Ambience: Application of Pattern Recognition to Analyze the Output from Temperature-Modulated Nanoparticulate WO3 Gas Sensors
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2005 (engelsk)Inngår i: Sensors Actuators, Vol. B 104, s. 124-131Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:uu:diva-67675 (URN)
Tilgjengelig fra: 2006-03-08 Laget: 2006-03-08 Sist oppdatert: 2011-01-12
Hoel, A., Reyes, L. F., Saukko, S., Heszler, P., Lantto, V. & Granqvist, C. (2005). Gas Sensing with Films of Nanocrystalline WO3 and Pd made by Advanced Reactive Gas Deposition. Sensors Actuators, B 105, 283-289
Åpne denne publikasjonen i ny fane eller vindu >>Gas Sensing with Films of Nanocrystalline WO3 and Pd made by Advanced Reactive Gas Deposition
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2005 (engelsk)Inngår i: Sensors Actuators, Vol. B 105, s. 283-289Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:uu:diva-76861 (URN)
Tilgjengelig fra: 2006-03-08 Laget: 2006-03-08 Sist oppdatert: 2011-01-11
Heszler, P., Ionescu, R., Llobet, E., Hoel, A., Smulko, J. M., Kish, L. B. & Granqvist, C. G. (2005). Gas Sensing with Porous Nanoparticle Films Using Resistance Modu-lation and Resistance Fluctuation (Noise) Spectroscopy. In: Int. Symp. On Nano-technology in Envieonmental Protection and Pollution (pp. 31).
Åpne denne publikasjonen i ny fane eller vindu >>Gas Sensing with Porous Nanoparticle Films Using Resistance Modu-lation and Resistance Fluctuation (Noise) Spectroscopy
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2005 (engelsk)Inngår i: Int. Symp. On Nano-technology in Envieonmental Protection and Pollution, 2005, s. 31-Konferansepaper, Publicerat paper (Annet vitenskapelig)
Identifikatorer
urn:nbn:se:uu:diva-77249 (URN)
Tilgjengelig fra: 2006-03-13 Laget: 2006-03-13
Heszler, P., Ionescu, R., Llobet, E., Smulko, J. M., Kish, L. B. & Granqvist, C. G. (2005). Porous Nanoparticle Films for Gas Sensing. In: Hungarian Nanotechnology Symposium (pp. 33).
Åpne denne publikasjonen i ny fane eller vindu >>Porous Nanoparticle Films for Gas Sensing
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2005 (engelsk)Inngår i: Hungarian Nanotechnology Symposium, 2005, s. 33-Konferansepaper, Publicerat paper (Annet vitenskapelig)
Identifikatorer
urn:nbn:se:uu:diva-77252 (URN)
Tilgjengelig fra: 2006-03-13 Laget: 2006-03-13
Ederth, J., Hultåker, A., Niklasson, G. A., Heszler, P., van Doorn, A. R., Jongerius, M. J., . . . Granqvist, C. G. (2005). Thin Porous Indium Tin Oxide Nanoparticle Films: Effects of Annealing in Vacuum and Air. Appl. Phys., A 81, 1363-1368
Åpne denne publikasjonen i ny fane eller vindu >>Thin Porous Indium Tin Oxide Nanoparticle Films: Effects of Annealing in Vacuum and Air
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2005 (engelsk)Inngår i: Appl. Phys., Vol. A 81, s. 1363-1368Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:uu:diva-76854 (URN)
Tilgjengelig fra: 2006-03-08 Laget: 2006-03-08 Sist oppdatert: 2015-06-24
Alm, O., Landström, L., Boman, M., Granqvist, C.-G. & Heszler, P. (2005). Tungsten oxide nanoparticles synthesised by laser assisted homogeneous gas-phase nucleation. Applied Surface Science, 247(1-4), 262-267
Åpne denne publikasjonen i ny fane eller vindu >>Tungsten oxide nanoparticles synthesised by laser assisted homogeneous gas-phase nucleation
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2005 (engelsk)Inngår i: Applied Surface Science, Vol. 247, nr 1-4, s. 262-267Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Tungsten oxide nanoparticles were generated by excimer (ArF) laser assisted chemical vapor deposition from WF6/H2/O2/Ar gas mixtures. The deposited particles were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The deposition rate as a function of the partial pressures of the reactants and of the laser fluence was measured by X-ray fluorescence spectroscopy. The mean diameter of the deposited tungsten oxide particles varied with the experimental parameters and was typically 23 nm. Particles with a higher degree of crystallinity were observed at a laser fluence exceeding 130 mJ/cm2, and X-ray amorphous particles were obtained below 110 mJ/cm2. The amorphous tungsten oxide had a stoichiometry ranging from WO2.7 to WO3. Deposits were formed only when hydrogen was present in the gas mixture.

Emneord
Tungsten oxide, Nanostructured materials, LCVD
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-76070 (URN)doi:10.1016/j.apsusc.2005.01.052 (DOI)
Tilgjengelig fra: 2006-03-08 Laget: 2006-03-08 Sist oppdatert: 2011-01-11
Heszler, P., Landström, L. & Granqvist, C.-G. (2004). Basics of UV Laser Assisted Generation of Nanoparticles, in Gas-Phase Nanoparticle Synthesis. In: Gas Phase Nanoparticle Synthesis (pp. 69-122). : Kluwer Acad. Publ.
Åpne denne publikasjonen i ny fane eller vindu >>Basics of UV Laser Assisted Generation of Nanoparticles, in Gas-Phase Nanoparticle Synthesis
2004 (engelsk)Inngår i: Gas Phase Nanoparticle Synthesis, Kluwer Acad. Publ. , 2004, s. 69-122Kapittel i bok, del av antologi (Fagfellevurdert)
sted, utgiver, år, opplag, sider
Kluwer Acad. Publ., 2004
Identifikatorer
urn:nbn:se:uu:diva-67690 (URN)
Tilgjengelig fra: 2005-05-02 Laget: 2005-05-02
Kopniczky, J., Hoel, A., Mechler, A., Heszler, P. & Granqvist, C.-G. (2004). Gas Deposited WO3 Nanoparticles Studied by Atomic Force Microscopy. In: Proc SPIE 5472 (pp. 183-190).
Åpne denne publikasjonen i ny fane eller vindu >>Gas Deposited WO3 Nanoparticles Studied by Atomic Force Microscopy
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2004 (engelsk)Inngår i: Proc SPIE 5472, 2004, s. 183-190Konferansepaper, Publicerat paper (Fagfellevurdert)
Identifikatorer
urn:nbn:se:uu:diva-47794 (URN)
Tilgjengelig fra: 2005-05-02 Laget: 2005-05-02
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