3 research outputs found
DataSheet1_Formation of low- and high-spatial frequency laser-induced periodic surface structures (LIPSSs) in ALD-deposited MoS2.PDF
The formation of laser-induced periodic surface structures (LIPSSs) on the atomic layer-deposited (ALD) molybdenum disulfide (MoS2) upon femtosecond laser processing is studied experimentally. Laser-processing parameters such as average laser power and the scan speed at which the formation of the periodic nanostructures takes place are identified. Optical and scanning electron microscopy are applied to identify the parameter regions for the different LIPSS formations and transitions between them. High- and low-spatial frequency LIPSS (HSFL and LSFL) with two distinct periods λLSFL ≈ 1.1 μm and λHSFL ≈ 83 nm can be observed. The HSFL are dominating at higher and the LSFL at lower laser average powers. Formation of LIPSS is found to inhibit laser ablation at lower scan speeds.</p
MATLABcode_vortexopening.m
Opening of a vortex beam to join non-transparent particles by optical tweeze
Photoactive Zinc Ferrites Fabricated via Conventional CVD Approach
Owing
to its narrow band gap and promising magnetic and photocatalytic
properties, thin films of zinc ferrite (ZFO, ZnFe<sub>2</sub>O<sub>4</sub>) are appealing for fabrication of devices in magnetic recording
media and photoelectrochemical cells. Herein we report for the first
time the fabrication of photactive zinc ferrites via a solvent free,
conventional CVD approach, and the resulting ZFO layers show promise
as a photocatalyst in PEC water-splitting. For large scale applications,
chemical vapor deposition (CVD) routes are appealing for thin film
deposition; however, very little is known about ZFO synthesis following
CVD processes. The challenge in precisely controlling the composition
for multicomponent material systems, such as ZFO, via conventional
thermal CVD is an issue that is caused mainly by the mismatch in thermal
properties of the precursors. The approach of using two different
classes of precursors for zinc and iron with a close match in thermal
windows led to the formation of polycrystalline spinel type ZFO. Under
the optimized process conditions, it was possible to fabricate solely
ZFO in the desired phase. This work demonstrates the potential of
employing CVD to obtain photoactive ternary material systems in the
right composition. For the first time, the application of CVD grown
ZFO films for photoelectrochemical applications is being demonstrated,
showing a direct band gap of 2.3 eV and exhibiting activity for visible
light driven photoelectrochemical water splitting