Photoinduced energy and electron transfer in rubrene–benzoquinone and rubrene–porphyrin systems

Real-time observation of ultrafast electron injection at graphene–Zn porphyrin interfaces

“…5 Moreover, porphyrins have good light-harvesting properties because of high molar extinction coefficients of their Soret and Q-bands in the UV/Vis spectra, and they show unique photophysical and electrochemical properties that are tunable by varying the meso-functional groups and through interactions with metal atoms. 6,7 There have been a number of systems comprising noncovalent association of porphyrins with small molecules, 8,9 polymers, 10 DNA, 11 metallic nanoparticles, 12 and semiconductor quantum dots. 6,7 There have been a number of systems comprising noncovalent association of porphyrins with small molecules, 8,9 polymers, 10 DNA, 11 metallic nanoparticles, 12 and semiconductor quantum dots.…”

“…4,5 On the other hand, the two-dimensional (2D) crystalline lattice of hybridized carbon atoms provided by graphene has been a new material of research interest, owing to its unique electronic, mechanical, and thermal properties, for future electronic and energy applications. 6,7 There have been a number of systems comprising noncovalent association of porphyrins with small molecules, 8,9 polymers, 10 DNA, 11 metallic nanoparticles, 12 and semiconductor quantum dots. 13,14 Recently, we reported that free positively charged porphyrins, 5,10,15,20-tetra(1-methyl-4-pyridino) porphyrin tetra( p-toluenesulfonate) (H 2 TMPyP) and 5,10,15,20-tetra(4trimethylammoniophenyl) porphyrin tetra( p-toluene-sulfonate) (TMAP), form complexes with negatively charged graphene carboxylate (GC) via electrostatic and p-p stacking interactions.…”

Unraveling the Carrier Dynamics and Photocatalytic Pathway in Carbon Dots and Pollutants of Wastewater System

“…30,31 Similarly, for the C-Dot-BQ complex (Figure 3c), a positive absorption band at 400 nm was observed during excitation at 320 nm, which can be attributed to the formation of the anionic BQ radical. 3 The 3e,f, and all the kinetics can be fitted with single-exponential growth and triexponential decay with different time constants (Table 1). The rates of ET and HT could be measured by following the kinetics of the growth component of the anionic radical of BQ and the cationic radical of PYZ.…”

“…Wastewater contains numerous pollutants such as metal ions and organic and inorganic elements; among them organic and inorganic pollutants are the main pollutants that industrial water yields. We focus on two important wastewater organic pollutants, pyrazine (PYZ) and benzoquinone (BQ), due to the matching of their redox energy level with the photosensitizer carbon dots (C-Dots). − To date various technologies have been developed and commercialized to purify and separate pollutants from wastewater, such as ion exchange, anaerobic technologies, biofilm technologies, membrane separation, adsorption process, chemical processes, and photocatalysis. − Among all developed technologies related to the research of wastewater treatment, photocatalysis is used more due to the utilization of solar energy to produce renewable H 2 from the wastewater. , …”

The impact of Au doping on the charge carrier dynamics at the interfaces between cationic porphyrin and silver nanoclusters

“…[30] Femtosecond (fs) time-resolved laser spectroscopy can convey detailed information regarding the deactivation of the excited state in many chemical and material systems. [31][32][33][34][35][36][37][38] Therefore, we performed fstransient absorption (TA) spectroscopic measurement with broadband capabilities and 120 fs temporal resolution. Upon analyzing the TA data ( Figure 3) in a different time domains, the TMPyP in the absence of NCs shows a GSB approximately 423 nm and a broad ESA extending from 450 -650 nm.…”