Self-Assembly for Two Types of J-Aggregates: cis-Isomers of Dye on the Carbon Nanotube Surface and Free Aggregates of Dye trans-Isomers

Abstract

Development of novel nanoscale devices requires unique functional nanomaterials. Furthermore, chemical design of different nanoparticles in one unit is a complex task, particularly the application of self-assembly J-aggregates, which can substantially advance the nanomaterial's properties due to resonant delocalization of excitons. Here, we have demonstrated for the first time formation of resonantly coherent J-aggregates on carbon nanotubes with highly efficient energy transfer from the aggregates to the nanotubes. All energy of photons absorbed by the aggregates is conveyed to the nanotubes, completely quenching the Jband emission and photosensitizing the nanotubes. Overall, we discovered formation of two types of J-aggregates, where one type is related to self-assembly of cis-isomers on the nanotube surface and second type is associated to self-organizing trans-isomers into free J-aggregates without the nanotubes. Importantly, the J-aggregates on carbon nanotubes with strong energy transfer peaks of photoluminescence in near infrared range is of high interest for practical applications on biomedical imaging, nanoscale optoelectronic and nanophotonic devices.

Effect of Zwitterionic Additive on Electrode Protection through Electrochemical Performances of Anatase TiO2 Nanotube Array Electrode in Ionic Liquid Electrolyte

“…In addition, some of zwitterionic compounds [1-(1-Butylpyrrolidinium)butane-4-sulfonate betaine, 1-(Tri-n-butylphosphonium)butane-4-sulfonate betaine [ 54 ]], contributed to the stabilization of the Li + ions in the mixtures. When compounds with a similar sulfonate functional group, such as sodium dodecylbenzene sulfonate [ 55 ] interact with nanotubes, the self-organization of organic molecules with the carbon nanotubes led to the formation of functionalized molecular structures with advanced properties [ 55 , 56 ]. Some future steps for further development of efficient zwitterionic compounds could lie in the modification of substituents in the imidazole ring (such as a vinyl group, or oxygenated alkyl side chain attached at one N in the imidazole ring) with the same SO 3 part from the other side of imidazole ring.…”

Antidegradation Property of Alginate Materials by Riveting Functionalized Carbon Nanotubes on the Sugar Chain

“…According to Petro Lutsyk’s report, 42 MWCNTs can serve as energy acceptors. As shown in the UV–vis absorption spectra ( Figure 3 a), SA has no obvious absorption peak ( Figure S2 ), while the SA/COOH-MWCNTs composite exhibits slightly higher intensities at 250 and 300 nm than those of COOH-MWCNTs, which is attributed to the contribution of the weak absorption of SA.…”

The Pursuit of Shortwave Infrared-Emitting Nanoparticles with Bright Fluorescence through Molecular Design and Excited-State Engineering of Molecular Aggregates

“…One of the promising directions would be hybrid organic–inorganic nanocomposite SWIR probes that combine the merits of both components  the large ε of organic materials and the large Φ fl of inorganic semiconducting materials. The high durability of such systems has been demonstrated in J-aggregate-based photosensibilization and photoluminescence amplification in SWNTs and NIR emitting PbS quantum dots, , organic dye-coated RENPs providing a tunable excitation, and increased SWIR luminescence with up to 40-fold enhancement. , The biocompatibility would remain a key issue for the development of hybrid organic–inorganic nanocomposites. In addition, a key issue for the development of hybrid nanocomposites will be the complexity of such a hybrid system.…”