The formation of nanodimensional structures on the surface of Tin exposed to femtosecond laser pulses in the ambient environment of ethanol (original) (raw)
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In this study, nanomaterials prepared via laser ablation of tin in water are systematically studied and compared. Tin targets were ablated by both millisecond and nanosecond pulsed lasers, resulting in core@shell product nanostructures with different chemistries and morphologies. Depending on laser fluence, the obtained core@shell nanoparticles had either Sn or SnO cores and SnO x shells with varied surface hydration degree. Optical emission spectra of laser-generated plasmas were taken, giving additional support to nanoparticle formation mechanisms. Finally, gas sensing at room temperature is demonstrated as one of the potential applications for such nanostructures.
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The study of phenomena induced by laser radiation in both continuous (CW) and pulsed modes on solid surfaces is a widely-explored subject of modern solid-state physics and chemistry. Since the advent of the first laser in the 1960s, a huge number of scientific papers have been devoted to the investigation of different kinds of laser-matter processes, such as laser-induced damage, plasma formation, phase transitions, micro-and macroprocessing, laser-induced chemical reactions at gassolid and liquid-solid, etc. These efforts have resulted in new laser applications in industry, e.g. cutting, welding and hardening. The laser has become a useful tool for initiating unique chemical reactions to produce advanced materials, like ultrahard ones for example. A number of technological applications, such as laser-induced deposition of metals on porous materials and semiconductor surfaces, already exist in the high-tech industry of micro-and nanoelectronics. Production of catalyzers with tailored properties of different nanostructures and components is prevalent in the chemical industry.
Applied Physics A, 2013
The present work deals with growth of nanoscale periodic and dot-like structures on the surface of stainless steel (SS) by the irradiation of femtosecond laser pulses. For this purpose Ti: Sapphire femtosecond laser pulses (wavelength of 800 nm, pulse length of 25 fs and pulse repetition rate of 1 kHz) were employed in a dry (air) and liquid confined (deionized water and ethanol) environments. The targets were exposed to 1000 succeeding pulses for various fluences ranging from 50 to 150 mJ cm −2. Nanoscale structures including ripples, and dots were observed by SEM analysis. The growth and dependence of structure-formation on the ambient environment and laser fluence in both central as well as peripheral ablated areas is systematically investigated. The development of nanostructures and nanoripples is correlated with structural analysis carried out by micro Raman spectroscopy. 1 Introduction Femtosecond lasers have been established to be an excellent and universal tool for micro-and nanostructuring of solid materials. The emergence of self-formed Laser-Induced Periodic Surface Structures (LIPSS) on the surface of metals,
Effect of liquid medium on size and shape of nanoparticles prepared by pulsed laser ablation of tin
Applied Physics A-materials Science & Processing, 2009
The effect of the surrounding liquid medium on the size, shape and optical absorption of synthesized nanoparticles prepared by laser ablation of pure tin in different liquids is investigated. The liquid not only confines the ablated species at the liquid–solid interface, but also it acts as a mediator for chemical reaction at the liquid–solid interface. The liquid media surrounding the target is thus an important factor affecting the shape, mean size, size distribution and composition of the particles. The ablation of tin target was carried out in deionized water, ethanol and acetone medium, leading to formation of tin and tin oxide nanoparticles of various sizes and shapes. Electron microscopy and optical absorption were employed for characterization of the particle size, shape and optical properties, respectively. The effect of surfactant was also studied by carrying out ablation in aqueous sodium dodecyl sulfate (SDS) or cetyl trimethyl ammonium bromide (CTAB) solution. It was observed that the average particle size and size distribution are considerably reduced by using surfactant.
Applied Physics A Physico-chemical aspects of femtosecond-pulse-laser-induced surface nanostructures
Near-ablation threshold investigations focusing on the generation of periodic nanostructures and their correlation with physico-chemical properties of the solid phase such as e.g., the material-dependent surface energy, were conducted. Molecular dynamic modelling in the sub-picosecond time domain was used to consider ultrafast opto-electronic processes triggering surface reorganization reactions. Fluid containment of solid interfaces showed strong influence on the resulting micro-and nanostructures due to its drastic reduction of the surface energy. The phenomena are discussed in respect to the minimization of the surface free energy in dependence of material composition and interfacial structure. PACS 78.70.-g; 81.07.-b; 68.35.Md 3
Physico-chemical aspects of femtosecond-pulse-laser-induced surface nanostructures
Applied Physics A, 2005
Near-ablation threshold investigations focusing on the generation of periodic nanostructures and their correlation with physico-chemical properties of the solid phase such as e.g., the material-dependent surface energy, were conducted. Molecular dynamic modelling in the sub-picosecond time domain was used to consider ultrafast opto-electronic processes triggering surface reorganization reactions. Fluid containment of solid interfaces showed strong influence on the resulting micro-and nanostructures due to its drastic reduction of the surface energy. The phenomena are discussed in respect to the minimization of the surface free energy in dependence of material composition and interfacial structure. PACS 78.70.-g; 81.07.-b; 68.35.Md 3
METALLOFIZIKA I NOVEISHIE TEKHNOLOGII, 2019
Surface texturing of metals and alloys with Ti: Sapphire femtosecond laser has been carried out in air. The peculiarities of surface patterns formed on the surface of noble metals (silver, gold, copper), refractory metal (tungsten) and metal-semiconductor alloy under ultrashort laser pulses have been studied by means of the surface morphology analysis. The influence of the laser ablation process on the formation of nanoscale features on the laser treated surfaces has been discussed. In the experiments, the low fluence multi-pulse regime near the ablation threshold for studied materials has been realized. The average sizes of nanoscale features formed under ultrashort laser processing on the surface structures have been determined for silver, gold, copper and tungsten. Observed enhancement of Raman signal for some vibrations of Methylene Blue dye adsorbed on laser-induced Ag surface structures demonstrates the possibility of an application of the laser-textured substrates as surface enhanced Raman scattering (SERS) substrates used for biosensing.
Radiation Effects and Defects in Solids, 2015
Surface and structural properties of the laser irradiated titanium targets have been investigated under dry and wet ambient environments. For this purpose KrF Excimer laser of wavelength 248 nm, pulse duration of 20 ns and repetition rate of 20 Hz has been employed. The targets were exposed for various number of laser pulses ranging from 500 to 2000 in the ambient environment of air, de-ionized water and propanol at a fluence of 3.6 J/cm 2 . The surface morphology, chemical composition and crystallographical analysis were performed by using Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Diffraction (XRD), respectively. For both central and peripheral ablated areas, significant difference in surface morphology has been observed in case of dry and wet ambient conditions. Large sized and diffused grains are observed in case of dry ablation. Whereas, in case of wet ablation, small sized, and well defined grains with distinct grain boundaries and significantly enhanced density are revealed. This difference is ascribed to the confinement effects of the liquid. The peripheral ablated area shows redeposition in case of dry ablation whereas small sized grain like structures are formed in case of wet ablation. EDS analysis exhibits variation in chemical composition under both ambient conditions. When the targets are treated in air environment, enhancement of the oxygen as well as nitrogen content is observed while in case of de-ionized water and propanol only increase in content of oxygen is observed. X-ray diffraction analysis exhibits formation of oxides and nitrides in case of air, whereas, in case of de-ionized water and propanol only oxides along with hydrides are formed. For various number of laser pulses the variation in the peak intensity, crystallinity and d-spacing is observed under both ambient conditions.