Photophysical properties of ball milled silicon nanostructures

Abstract

High-energy ball milling was used to synthesize blue-green emitting Si nanocrystals from micron sized silicon particles.

Green synthesis of aryl‐(4‐oxo‐1,2‐dihydroquinazolin‐4‐yl‐methylene) pyrazole‐TiO2 nanoparticles as dyes removable for waste water treatment

“…In order to verify the attachment of the QPP molecules on the surface of the TiO 2 nanoparticles, the FTIR spectra were collected in the region of 400–4000 cm −1 for both the naked TiO 2 and QPP/TiO 2 samples. The large peaks at 3380 and 1620 cm −1 in the spectrum of pure TiO 2 are most likely attributable to stretching vibrations of O‐H groups and to bending vibrations of H‐O‐H in the case of the adsorbed water molecules 12,24 . Typical metal oxide connections, such as Ti‐O stretching and Ti‐O‐Ti bridging, are responsible for the broad band in the region of 400–820 cm −1 11 .…”

“…17 Quinazolinone derivatives are an appreciated class of heterocyclic compounds that are commonly employed in various fields such as pharmaceuticals and biomedicine for Alzheimer's disease, 18 diabetes mellitus, 19 inhibitor of SARS-CoV-2 20 and COVID-19, 21 basic bioactive in medicinal chemistry, 22 and approaching in material science. 23,24 Accordingly, the authors designate the creation of innovative quinazoline-pyrazole derivatives (QPP) as a novel organic sensitizer for TiO 2 nanoparticles, and they are confirmed with FTIR, NMR and UV-visible spectra. Further, TiO 2 was prepared by the facile-free sol-gel approach and was incorporated with QPP photosensitizer using a facile impregnation method.…”

“…Dye degradation is corroborated by a reduction in absorbance maximum values with increasing irradiation time 17 . Quinazolinone derivatives are an appreciated class of heterocyclic compounds that are commonly employed in various fields such as pharmaceuticals and biomedicine for Alzheimer's disease, 18 diabetes mellitus, 19 inhibitor of SARS‐CoV‐2 20 and COVID‐19, 21 basic bioactive in medicinal chemistry, 22 and approaching in material science 23,24 …”

Microscopic Proof of Photoluminescence from Mechanochemically Synthesized 1-Octene-Capped Quantum-Confined Silicon Nanoparticles: Implications for Light-Emission Applications

“…The full process scheme is depicted in Figure . We followed the synthesis process as described in our previous reports with a difference in the addition of ligands at the end of the milling process. , Silicon powder (1 g) is loaded into a custom-built attritor-type high-energy ball-mill vessel. A WC milling medium is used in the process.…”

“… 28 In our recent study, we also observed blue PL from high-energy ball-milled SiNPs capped with oxides, likely originating from metallic defects introduced into the SiNPs during the ball-milling from the milling media (balls and vessel). 32 These experiments highlight the importance of experimental scrutiny to minimize the contamination and assumptions.…”