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Full Spectrum Electrochromic WO Mechanism and Optical Modulation via Ex Situ Spectroscopic Ellipsometry: Effect of Li Surface Permeation.
Micromachines (Basel)
December 2024
School of Physics, Changchun University of Science and Technology, Changchun 130012, China.
Tungsten oxide (WO) electrochromic devices are obtaining increasing interest due to their color change and thermal regulation. However, most previous work focuses on the absorption or transmission spectra of materials, rather than the optical parameters evolution in full spectrum in the electrochromic processes. Herein, we developed a systematic protocol of ex situ methods to clarify the evolutions of subtle structure changes, Raman vibration modes, and optical parameters of WO thin films in electrochromic processes as stimulated by dosage-dependent Li insertion.
View Article and Find Full Text PDFTetrafluoro(aryl)sulfanylated Bicyclopentane Crystals That Self-Destruct upon Cooling.
J Am Chem Soc
January 2025
Department of Chemistry, University of California, Davis, 1 Shields Avenue, Davis, California 95616, United States.
Article Synopsis
- Single crystals of organic compounds that respond to heat or light are well-studied, but those showing extreme mechanical response are less common in research.
- A tetrafluoro(aryl)sulfanylated bicyclopentane developed in this study exhibited a low-temperature thermosalient effect, where crystals jumped and disintegrated at temperatures below ∼193 K.
- Investigations using various techniques revealed that the mechanical response is not solely due to a chemical transformation or phase transition, but rather related to the release of built-up strain and possibly influenced by microstructural changes or impurities within the crystal.
Unveiling anharmonic scattering in van der Waals semiconductor GaPS through Raman spectroscopy and theoretical calculation.
iScience
November 2024
School of Electronic Information Engineering, Inner Mongolia University, Hohhot 010021, China.
The van der Waals thiophosphate GaPS presents additional opportunities for gallium-based semiconductors, but limited research on phonon interactions has hindered optimization on thermal properties. This research undertakes a comprehensive investigation into the anharmonic phonon scattering within GaPS. The findings reveal pronounced anharmonic scattering, with both cubic and quartic phonon scatterings significantly influencing phonon redshift and broadening.
View Article and Find Full Text PDFSilver Nanoparticles and Simvastatin-Loaded PLGA-Coated Hydroxyapatite/Calcium Carbonate Scaffolds.
Nanomaterials (Basel)
October 2024
Dipartimento di Scienze Farmaceutiche, Università di Perugia, Via del Liceo, 1, 06123 Perugia, Italy.
The need to develop synthetic bone substitutes with structures, properties, and functions similar to bone and capable of preventing microbial infections is still an ongoing challenge. This research is focused on the preparation and characterization of three-dimensional porous scaffolds based on hydroxyapatite (HA)-functionalized calcium carbonate loaded with silver nanoparticles and simvastatin (SIMV). The scaffolds were prepared using the foam replica method, with a polyurethane (PU) sponge as a template, followed by successive polymer removal and sintering.
View Article and Find Full Text PDFExtracting Thermodynamic Properties of Carbyne from Tip-Enhanced Raman Scattering Images.
J Phys Chem Lett
October 2024
Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, MOE Key Laboratory of Computational Physical Sciences, Department of Chemistry, Fudan University, Shanghai 200433, P. R. China.
The measurement of thermodynamic properties for nanosystems is essential to comprehend the inherent characteristics of nanomaterials. Traditional spectroscopy measurements, such as Raman or ultraviolet-visible spectroscopies, are limited to offering insights near the Γ point in the Brillouin zone and thus cannot precisely determine the system's thermodynamic properties, for example, heat capacity. Utilizing the intrinsic broad momentum distribution in highly confined plasmonic fields, here we take -hybridized carbyne as a proof-of-the-principle example to show that ultrahigh-resolution tip-enhanced Raman scattering (TERS) images have the ability to access all -points in the phonon Brillouin zone of one-dimensional nanosystems, allowing the comprehensive determination of vibrational features and heat capacity for finite carbon chains.
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