Ferroelectric nanofibers with an embedded optically nonlinear benzothiazole derivative

Abstract

We report measurements of the molecular first hyperpolarizability, thermal stability, photophysical, piezoelectric and ferroelectric properties of a benzothiazole derivative bearing an arylthiophene π-conjugated bridge both in solution and when embedded into a poly (L-lactic acid) (PLLA) matrix in the form of electrospun fibers with an average diameter of roughly 500 nm. The embedded nanocrystalline phenylthienyl-benzothiazole derivative, with crystal sizes of about 1.4 nm resulted in a good piezoelectric response from these functionalized electrospun fibers, indicative of a polar crystalline structure.

High Piezoelectric Output Voltage from Blue Fluorescent N,N-Dimethyl-4-Nitroaniline Nano Crystals into Poly-L-Lactic Acid Electrospun Fibers

“…The strong blue emission from NNDM4NA@PLLA fibers must have been favored by the fibers alignment and stretching imposed by the rotatory drum collector during the electrospinning process. It has been reported that the collection of electrospun nanofibers on a rotatory drum originates both aligned as well stretched fibers with increased photoluminescence [43], which together with a more effective molecular packing at nanoscale contributes to the Stokes shift of the observed emission [32]. Emission at blue wavelengths is of great importance for applications in luminescent devices [44], as only a few compounds have a significant increase in their light emission in their solid state overcoming the problem of aggregation quenching.…”

“…The technique has been used as a method for producing aligned polymer doped micro/nanofibers with a high degree of guest molecular polar orientation within the polymer. A large variety of organic molecules, from small nitroaniline derivatives to supramolecular dipeptides molecules, with enhanced piezoelectric and nonlinear optical second harmonic generation have been embedded into electrospun fibers [27,[29][30][31][32][33][34][35][36].…”

Synthesis of Pyridazine Derivatives by Suzuki-Miyaura Cross-Coupling Reaction and Evaluation of Their Optical and Electronic Properties through Experimental and Theoretical Studies

“…It is well known that electron-rich heterocycles such as thiophene and pyrrole, and electron-deficient heterocycles such as azole and azine and diazine derivatives: (Benzo)thiazole benzothiadiazole, pyridine, pyridazine etc. can act simultaneously as π-bridges and electron donors or acceptors, respectively [16,17,18,19,20,21,22,23,24,38,52,53,54,55,56,57,58,59,60,61,62,63]. …”

“…These systems have applications as SHG chromophores [52,53,54,55,56,57,58,59,60,61,62,63], organic sensitizers for dye sensitized solar cells (DSSCs), organic fluorophores for organic light emitting diodes (OLEDs), optical chemosensors, DNA intercalations, heterogeneous catalysts, etc.…”

Decoding Apparent Ferroelectricity in Perovskite Nanofibers

“…In most of the existing reports on perovskite nanostructures, the presence of ferroelectricity is established via the detection of the PFM hysteresis loops, which serve as a preponderant evidence toward switchable ferroelectric polarization. In certain cases, these studies are complemented by observations of polarization domains. , Beyond the qualitative studies through piezoresponse images, however, the quantitative analysis of the PFM data for these materials is inaccurate and contradict each other. − For example, the piezoelectric coefficient ( d 33 ) values reported for KNO nanostructures vary from 30 to 105 pm V –1 . , In another case, Li et al carried out PFM on BFO nanowire and determined the d 33 to be around 31 pm V –1 , whereas investigations of Xie et al showed extremely small piezoresponse of 8.7 pm V –1 for a similar sized nanowire. , Furthermore, the latter report questioned the possibility of electrostatic interactions in the PFM data rather than pure piezoelectric signals. Although synthesis routes are understood to an extent, the piezoelectric characterization of nanoscale perovskites is still incomplete.…”