Sintering of thin titanium dioxide nanoparticle films via photothermal processing with ultraviolet continuous-wave lasers

Schade, Lina; Franzka, Steffen; Hardt, Sebastian; Wiggers, Hartmut; Hartmann, Nils

doi:10.1016/j.apsusc.2012.11.077

Cited by 19 publications

(10 citation statements)

References 18 publications

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“…Maximum laser power densities I 0 can be calculated via I 0 = 8P/πd 1/e 2 2 . 13 This yields values in the range of 3−11 MW/cm 2 . Note, despite the low thermal conductivity of np-Au, laser heating of thin samples at long pulse lengths, i.e., at τ > 10 ms, might be affected by the design and the material of the sample holder.…”

Section: Methodsmentioning

confidence: 99%

“…Typically, the laser writing parameters are varied between P = 100 and 350 mW, v = 0.5 and 7.5 mm/s, and τ = 0.2 and 100 ms. Maximum laser power densities I 0 can be calculated via I 0 = 8 P /π d 1/ e 2 2 . This yields values in the range of 3–11 MW/cm 2 .…”

Section: Experimental Sectionmentioning

confidence: 99%

“…[3][4][5][6]9 Of particular interest for many applications in energy research and other fields is the fabrication of porous materials with laterally and vertically varying porosities. 13 In a previous study we addressed laser microsintering of thin nanoparticles layers in order to build up mesoporous films with locally altered porosity, 13,14 e.g., for applications in photocatalysis and photovoltaics. Here we expand this approach toward nanoporous gold.…”

Section: Introductionmentioning

confidence: 99%

“…In the past decade, laser processing of nanomaterials has gained significant attention in nanotechnology. − This interest originates from two interrelated issues. On one hand, laser techniques provide a unique combination of powerful technical features in order to build up large-scale functional nanomaterials, , e.g., starting with ultrathin organic coatings, nanoparticles, polymers, and biomolecules. − On the other hand, the unique properties of nanomaterials allow one to improve the inherent limitations of laser techniques, e.g., the spatial resolution of laser patterning techniques. − , …”

Section: Introductionmentioning

confidence: 99%

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Photothermal Laser Microsintering of Nanoporous Gold

et al. 2014

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Photothermal processing of nanoporous gold using a microfocused continuous-wave laser at a wavelength of 532 nm and a 1/e(2) spot diameter of 2.9 μm has been studied. In addition, complementary experiments have been carried out via conventional annealing. Scanning electron microscopy has been used for characterization. Local laser irradiation at distinct laser powers and pulse lengths results in coarsening of the porous gold structures. During laser processing the pore size of the native nanoporous gold increases to maximum values in the range of 0.25-3 μm. The affected areas exhibit lateral dimensions in the range of 2-10 μm. Overall two regions are distinguished. An inner region, where large pores and ligaments are formed and an outer region, where the pore size and ligament size gradually change and approach the feature sizes of the native material. A qualitative thermokinetic model allows one to reproduce the experimentally observed dependence of the laser-induced morphologies on the laser parameters. On the basis of this model the underlying processes are attributed to sintering and melting of the gold structures. The presented results demonstrate the prospects of photothermal laser processing in engineering porous gold with spatially varying porosities on micrometer to nanometer length scales.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photothermal Laser Microsintering of Nanoporous Gold

et al. 2014

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“…However, the historically quasi-static nature of this technique (i.e. the measurement of light scattering from objects fixed or slowly varying in space) is not amenable to integration with the wide array of the fast dynamics of laser microprocessing platforms that have seen a rise in recent years for a myriad of applications ranging from direct laser cutting/machining, ablating, additive manufacturing processes, as well as laser-induced periodic surface structure formation (LIPSS) [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Utilizing dynamic laser speckle to probe nanoscale morphology evolution in nanoporous gold thin films

Ly¹,

Şeker²,

Matthews³

2016

Opt. Express

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This paper demonstrates the use of dynamic laser speckle autocorrelation spectroscopy in conjunction with the photothermal treatment of nanoporous gold (np-Au) thin films to probe nanoscale morphology changes during the photothermal treatment. Utilizing this spectroscopy method, backscattered speckle from the incident laser is tracked during photothermal treatment and both the characteristic feature size and annealing time of the film are determined. These results demonstrate that this method can successfully be used to monitor laserbased surface modification processes without the use of ex-situ characterization. ©2016 Optical Society of America

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