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Stepwise Two-Photon-Induced Electron Transfer from Higher Excited States of Noncovalently Bound Porphyrin-CdS/ZnS Core/Shell Nanocrystals
摘要： There has been an increasing amount of interest in stepwise two-photon absorption (2PA)-induced photochemical reactions because of their extremely lower power thresholds compared to that of the simultaneous process and drastic reaction enhancements in some cases. However, stepwise 2PA-induced photochemical reactions were reported only in single chromophores and covalently bound bi-chromophores and there are few reports on these reactions in noncovalently bound systems because of weak electronic interactions among chromophores. This study demonstrated the stepwise 2PA-induced electron transfer from higher excited states in noncovalently bound protoporphyrin IX·CdS/ZnS core/shell nanocrystals (NCs). The electron transfer from higher excited states of porphyrin to CdS NCs successfully overcomes the activation barrier associated with the wide bandgap ZnS shell, indicating that a high reduction potential can be obtained with the stepwise 2PA process. The concept presented in this study can be applied to various noncovalently bound multi-chromophore systems to explore nonlinear photoresponses.
关键词： Nonlinear,Anti-Kasha type,colloidal nanocrystals,hybrid nanomaterial,hot electron transfer
更新于2025-09-23 15:21:01
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Elliptic cavity filled with hybrid nanomaterial under consideration of magnetic field
摘要： CVFEM usage for modeling of nanomaterial flow style in a permeable elliptical tank including Lorentz effect was scrutinized in current research. Hybrid material with use of homogeneous model was applied and radiation term has been involved in governing equations. Outputs have been depicted in contours and plots. In addition, new formula for Nu was reported. Augment of Nu with considering greater permeability can be explained by stronger temperature gradient in cases with higher Da. Nanomaterial flow become suppress with augment of Ha which results lower Nu. As Ha augment from 0 to 20, 18% reduction has been reported in Nu. Permeability has favor influence on nanomaterial flow and the impact of Ha is opposite of permeability.
关键词： Numerical modeling,Radiation,Hybrid nanomaterial,Lorentz
更新于2025-09-23 15:19:57
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Electrochemical behaviour and analytical applications of a manganese porphyrin a?? silica hybrid film prepared by pulsed laser deposition
摘要： Hybrid nanomaterials can have superior properties in comparison with individual components, sometimes greatly improving their optoelectronic activity. For this reason, modified carbon electrodes were obtained using a hybrid material composed of 5,10,15,20-tetra(4-tolyl)porphyrinato manganese (III) chloride (MnTTP) embedded in a silica matrix. The laser ablation deposition technique (PLD) has been used to immobilize the manganese porphyrin–silica hybrid on the surface of the carbon electrodes. The successful transfer of the manganese-porphyrin was evidenced by UV–Vis absorption spectroscopy. The PLD-deposited hybrid film was characterized using AFM and electrochemical methods (cyclic voltammetry and square wave voltammetry). The viability of this hybrid nanomaterial film as a redox mediator for the anodic oxidation and sensitive voltammetric determination of ascorbic acid in buffer solution (pH = 6.5) is described. The recorded anodic process is attributed to its oxidation to dehydroascorbic acid, with satisfactory catalytic current response and low non-Faradaic current.
关键词： Mn-porphyrin,Silica matrix,Hybrid nanomaterial,Pulse laser deposition,Electrocatalytic film,Ascorbic acid
更新于2025-09-19 17:13:59