Enhancement of photocatalytic activity by femtosecond-laser induced periodic surface structures of Si

Abstract

Laser induced periodic surface structures (LIPSS) represent a kind of top down approach to produce highly reproducible nano/microstructures without going for any sophisticated process of lithography. This method is much simpler and cost effective. In this work, LIPSS on Si surfaces were generated using femtosecond laser pulses of 800 nm wavelength. Photocatalytic substrates were prepared by depositing TiO2 thin films on top of the structured and unstructured Si wafer. The coatings were produced by sputtering from a Ti target in two different types of oxygen atmospheres. In first case, the oxygen pressure within the sputtering chamber was chosen to be high (3 × 10–2 mbar) whereas it was one order of magnitude lower in second case (2.1 × 10–3 mbar). In photocatalytic dye decomposition study of Methylene blue dye it was found that in the presence of LIPSS the activity can be enhanced by 2.1 and 3.3 times with high pressure and low pressure grown TiO2 thin films, respectively. The increase in photocatalytic activity is attributed to the enlargement of effective surface area. In comparative study, the dye decomposition rates of TiO2 thin films grown on LIPSS are found to be much higher than the value for standard reference thin film material Pilkington ActivTM.

Photo-Switchable Nanoripples in Ti3C2Tx MXene

“…The general chemical formula is M n +1 X n T x , where n = 1–3, M is an early transition metal, X is carbon or nitrogen, and T is a surface termination group, such as O, OH, or F. , MXenes exhibit a plethora of unique chemical, mechanical, optical, and electronic properties that find applications in chemical and mechanical sensing, energy storage, electronics, and nonlinear optics, to name a few . Insight from numerous studies has allowed one to rationalize, predict, engineer, and exploit those properties of MXenes for various applications. − However, MXenes with a controlled nanostructure, for example, with laser-induced periodic surface structures (LIPSS), , are currently not available, despite potential advantages of such materials for photocatalysis, antibiotic activity, charge storage, or surface-enhanced Raman scattering. − …”

On the Insignificant Role of the Oxidation Process on Ultrafast High-Spatial-Frequency LIPSS Formation on Tungsten

“…Here, HSFLs formation on tungsten (W) was investigated, because W is an important industrial metal (high hardness and high melting point) [ 44 , 45 ] and because it belongs to the same group as chromium in the periodic table, and thus W might be expected to undergo a similar oxidation-based HSFLs formation mechanism as discussed above. Furthermore, an investigation into the incorporation of oxygen during laser mater interaction is relevant not only to better understand HSFLs formation, but also because surface chemistry can influence many surface properties, including wettability [ 46 , 47 , 48 ], color [ 15 , 49 , 50 ], catalytic properties [ 51 , 52 ], and heat transfer potential [ 53 , 54 ], as seen for LSFLs.…”