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Heszler, Peter
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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
Öppna denna publikation i ny flik eller fönster >>Analysis of thermal radiation from laser-heated nanoparticles formed by laser-induced decomposition of ferrocene
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2005 (Engelska)Ingår i: Applied Physics A, ISSN 1432-0630, Vol. 81, s. 827-833Artikel i tidskrift (Refereegranskat) 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.

Nationell ämneskategori
Oorganisk kemi
Identifikatorer
urn:nbn:se:uu:diva-74244 (URN)doi:10.1007/s00339-005-3284-3 (DOI)
Tillgänglig från: 2006-03-08 Skapad: 2006-03-08 Senast uppdaterad: 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)
Öppna denna publikation i ny flik eller fönster >>Anomalies in Nanostructure Size Measurements by AFM
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2005 (Engelska)Ingår i: Phys. Rev., Vol. B 72, s. 125407 (1-6)Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-76865 (URN)
Tillgänglig från: 2006-03-08 Skapad: 2006-03-08 Senast uppdaterad: 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
Öppna denna publikation i ny flik eller fönster >>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 (Engelska)Ingår i: Sensors Actuators, Vol. B 104, s. 124-131Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-67675 (URN)
Tillgänglig från: 2006-03-08 Skapad: 2006-03-08 Senast uppdaterad: 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
Öppna denna publikation i ny flik eller fönster >>Gas Sensing with Films of Nanocrystalline WO3 and Pd made by Advanced Reactive Gas Deposition
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2005 (Engelska)Ingår i: Sensors Actuators, Vol. B 105, s. 283-289Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-76861 (URN)
Tillgänglig från: 2006-03-08 Skapad: 2006-03-08 Senast uppdaterad: 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).
Öppna denna publikation i ny flik eller fönster >>Gas Sensing with Porous Nanoparticle Films Using Resistance Modu-lation and Resistance Fluctuation (Noise) Spectroscopy
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2005 (Engelska)Ingår i: Int. Symp. On Nano-technology in Envieonmental Protection and Pollution, 2005, s. 31-Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Identifikatorer
urn:nbn:se:uu:diva-77249 (URN)
Tillgänglig från: 2006-03-13 Skapad: 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).
Öppna denna publikation i ny flik eller fönster >>Porous Nanoparticle Films for Gas Sensing
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2005 (Engelska)Ingår i: Hungarian Nanotechnology Symposium, 2005, s. 33-Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Identifikatorer
urn:nbn:se:uu:diva-77252 (URN)
Tillgänglig från: 2006-03-13 Skapad: 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
Öppna denna publikation i ny flik eller fönster >>Thin Porous Indium Tin Oxide Nanoparticle Films: Effects of Annealing in Vacuum and Air
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2005 (Engelska)Ingår i: Appl. Phys., Vol. A 81, s. 1363-1368Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-76854 (URN)
Tillgänglig från: 2006-03-08 Skapad: 2006-03-08 Senast uppdaterad: 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
Öppna denna publikation i ny flik eller fönster >>Tungsten oxide nanoparticles synthesised by laser assisted homogeneous gas-phase nucleation
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2005 (Engelska)Ingår i: Applied Surface Science, Vol. 247, nr 1-4, s. 262-267Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
Tungsten oxide, Nanostructured materials, LCVD
Nationell ämneskategori
Oorganisk kemi
Identifikatorer
urn:nbn:se:uu:diva-76070 (URN)doi:10.1016/j.apsusc.2005.01.052 (DOI)
Tillgänglig från: 2006-03-08 Skapad: 2006-03-08 Senast uppdaterad: 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.
Öppna denna publikation i ny flik eller fönster >>Basics of UV Laser Assisted Generation of Nanoparticles, in Gas-Phase Nanoparticle Synthesis
2004 (Engelska)Ingår i: Gas Phase Nanoparticle Synthesis, Kluwer Acad. Publ. , 2004, s. 69-122Kapitel i bok, del av antologi (Refereegranskat)
Ort, förlag, år, upplaga, sidor
Kluwer Acad. Publ., 2004
Identifikatorer
urn:nbn:se:uu:diva-67690 (URN)
Tillgänglig från: 2005-05-02 Skapad: 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).
Öppna denna publikation i ny flik eller fönster >>Gas Deposited WO3 Nanoparticles Studied by Atomic Force Microscopy
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2004 (Engelska)Ingår i: Proc SPIE 5472, 2004, s. 183-190Konferensbidrag, Publicerat paper (Refereegranskat)
Identifikatorer
urn:nbn:se:uu:diva-47794 (URN)
Tillgänglig från: 2005-05-02 Skapad: 2005-05-02
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