Stabiliser-free zinc oxide quantum dots have been utilised as a greener sensing platform for the quantification of arsenic at the parts-per-billion level. The method is free from common interference and applicable for real sample analysis.
Confinement of the electromagnetic field in gold nanoparticle dimers and trimers with variations in the interparticle distances and angles has been calculated.
The systematic combination of N-heterocyclic olefins (NHOs) with
fluoroarenes resulted in twisted push–pull alkenes. These alkenes
carry electron-donating cyclicdiamino substituents and two electron-withdrawing
fluoroaryl substituents in the geminal positions. The synthetic method
can be extended to a variety of substituted push–pull alkenes
by varying the NHO as well as the fluoroarenes. Solid-state molecular
structures of these molecules reveal a notable elongation of the central
C–C bond and a twisted geometry in the alkene motif. Absorption
properties were investigated with UV–vis spectroscopy. The
redox properties of the twisted push–pull alkenes were probed
with electrochemistry as well as UV–vis/NIR and EPR spectroelectrochemistry,
while the electronic structures were computationally evaluated and
validated.
Radiative cooling has attracted tremendous interest as it can tackle global warming by saving energy consumption in heating, ventilation, and air conditioning (HVAC) in buildings. Polymer materials play an important role in radiative cooling owing to their high infrared emissivity. Along this line, numerous studies on optically optimized geometries were carried out to enhance the selective wavelength absorption for high infrared emissivity; however, the polymer material itself relatively was not investigated and optimized enough. Herein, we investigate the infrared radiation (IR) absorption coefficient of various polymer types, and introduce a new concept of radiative-cooling composites. By dispersing the IR scattering medium in a polymer matrix, IR can be effectively scattered and attenuated by the polymer matrix. Indium tin oxide was utilized as the IR scattering medium in a cellulose acetate polymer matrix in this report. The window film was made with this composite and showed an effective cooling performance by outdoor thermal evaluation. This composite opens a new venue to endow materials with enhanced radiative-cooling property regardless of the polymer types.
Plasmonic sensitivity of noble metals has often been attributed to the morphology of the nanostructures and dielectric effects of both the materials and the surrounding medium. The measurable plasmonic shift with respect to the change in local dielectric as a function of analyte concentrations within nanoscale volume forms the basis of plasmonic sensing. However, the situation of the surrounding medium in the presence of multicomponent systems and, moreover, inhomogeneous adsorption around the anisotropic nanostructures become seemingly complicated as the precise description of several individual components becomes nearly impossible. Therefore, we have designed a retrospective formalism through a critical condensation of the electromagnetic scattering theories, macroscopic mixing rules, and micromechanics at the metal−analyte interface that can be adopted as generalized model irrespective of morphology of the nanostructures and the nature of analytes to account for the response of all the individual (microscopic) components to the observed (macroscopic) plasmonic sensing.
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