Resonant photothermal laser processing of hybrid gold/titania nanoparticle films

Schade, Lina; Franzka, Steffen; Dzialkowski, Kevin; Hardt, Sebastian; Wiggers, Hartmut; Reichenberger, Sven; Wagener, Philipp; Hartmann, Nils

doi:10.1016/j.apsusc.2014.09.118

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…The main goal is to understand and develop photon‐induced defect formation strategies and understand how different types and densities of defect sites contribute to the catalytic activity in different reaction scenarios. Despite the studies on single crystalline oxide surfaces and bulk materials as well as nanomaterials, no general mechanism on laser‐based defect generation in the liquid is available to date . From the present knowledge, the most important laser parameters determining defect formation in terms of electron excitation and occurring thermal stress during and after laser irradiation are: laser pulse duration, laser fluence, the particle mass‐specific laser energy dose and laser wavelength .…”

Section: Future Prospects: Laser‐based Defect Engineeringmentioning

confidence: 99%

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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Due to material gaps and synthesis‐related cross‐correlations in heterogeneous catalysis, chemists and physicists are constantly motivated to develop novel catalyst preparation methods for independent control of morphology, size, and composition. Within this article, advances, opportunities, and the current limits of laser‐based catalyst preparation technique, as well as synergies with conventional methods will be reviewed in terms of purity, particle size, morphology, composition, and nanoparticle‐support interaction. It will be shown, that the surfactant‐free particles represent ideal model materials to validate kinetic models and conduct parametric activity studies by independent adjustment of functional properties like nanoparticle size, composition, and load. Consequently, the importance of transient plasma dynamics tailoring nanoparticle formation will be pointed out, comparing experimental studies with own calculations and novel simulations taken from literature. Finally, perspectives of surfactant‐free colloidal nanoparticles for unrevealing active sites in heterogeneous catalysts are presented.

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Section: Future Prospects: Laser‐based Defect Engineeringmentioning

confidence: 99%

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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“…The occurrence of photo-and/or thermally induced processes is thus beyond doubt, although no consensus on the nature of those processes has been reached. Phase transitions to the thermodynamically stable rutile structure have been proposed to occur at low temperature and possibly induced by light stimulus [19][20][21]. In this respect, the deliberate phase transformation of anatase to rutile has recently been brought about in Au/ TiO 2 nanoparticulate films by laser processing [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…Phase transitions to the thermodynamically stable rutile structure have been proposed to occur at low temperature and possibly induced by light stimulus [19][20][21]. In this respect, the deliberate phase transformation of anatase to rutile has recently been brought about in Au/ TiO 2 nanoparticulate films by laser processing [21,22]. Both a laser with wavelength in the visible (532 nm) and the UV range (355 nm) were able to inflict structural changes in Au/ TiO 2 , but only the UV laser could induce similar changes in nanoparticulate TiO 2 alone.…”

Section: Introductionmentioning

confidence: 99%

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Probing Oxide Reduction and Phase Transformations at the Au-TiO2 Interface by Vibrational Spectroscopy

et al. 2017

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“…Other works could show that the integration of nanoparticles has a positive influence on continuous wave laser structuring [19] or pulsed laser structuring [20,21]. These studies focused on laser structuring processes.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle improved metal materials for additive manufacturing

2017

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A variety of laser systems and powder materials is available for additive manufacturing processes such as powder bed fusion of metallic parts (laser beam melting). The required energy density for a sufficient melting of powder materials strongly depends on the optical properties of the used powder (e.g., absorption, reflection and transmittance). During laser irradiation a moving melt pool is generated in the laser heat affected zone. Re-solidification of the molten particles results in interconnected welding lines similar to those of traditional welding processes. Here, the layer by layer approach combined with a selective laser exposure in cross-sectional areas of the parts enable the generation of 3D structures from the powder bed. The mechanical properties of such fabricated structures are usually comparable to the mechanical properties of the bulk material the powder particles are made of. In this paper, a proof of principle is demonstrated to receive improved mechanical or other properties of parts being manufactured by laser beam melting. The approach addresses laser beam melting of the commonly available powder materials tool steel (1.2709) and Hastelloy X (2.4665) which are additionally modified with nanoparticles (Al 2 O 3 ) on their surfaces. Due to the shortage of these two available nanoparticle modified materials (about 100 g each) only relatively small test specimens are manufactured and, therefore, only limited typical characteristic values could be determined. However, the nanoparticle modified and laser beam molten 3D structures were systematically characterized by optical and scanning electron microscopy, energy-dispersive X-ray microanalysis, micro hardness indentation and etching analysis. It turns out that modification of the educt powder surfaces with nanoparticles prior to laser beam melting can improve e.g., mechanical properties of the generated 3D structures.Keywords Additive manufacturing Á Powder bed fusion (laser beam melting) Á Laser-generation of nanomaterials Á Tool steel (1.2709) and Hastelloy X (2.4665)

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Resonant photothermal laser processing of hybrid gold/titania nanoparticle films

Cited by 5 publications

References 16 publications

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Probing Oxide Reduction and Phase Transformations at the Au-TiO2 Interface by Vibrational Spectroscopy

Nanoparticle improved metal materials for additive manufacturing

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