Dual photoluminescence and charge transport in an alkoxy biphenyl benzoate ferroelectric liquid crystalline–graphene oxide composite

Abstract

GO has been dispersed in a ferroelectric liquid crystalline material to prepare a FLC–GO composite.

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

“…The uniformity of POM color in the entire bright state has also confirmed that the LC molecules are uniformly aligned in the nematic matrix of the E7 LC [37][38][39][40][41]. However, the dispersion of MWCNTs in the E7 LC into different concentrations leads to the change in color of POMs, which is associated to the change in refractive index and/or birefringence (∆n) as reported previously [42][43][44]. Besides, all the POM images have also been processed by ImageJ software to analyze the uniformity of color within a POM image.…”

Photoluminescence modulation in the graphene oxide dispersed 4-n-octyl-4’-cyanobiphenyl molecular system

“…Additionally, we have previously reported that the 2D-GO flakes exhibit two ab-sorption peaks at 230 and 300 nm,(supplementary figure S1), attributed to π-π* transitions of C=C bonds and to n-π* transitions of C=O bonds, respectively [19,26]. In 8CB/2D-GO composites, the successive addition of increasing weight concentration of GO results a trivial narrowing in the absorption bandwidth.…”

“…2D-GO nanoflakes were synthesized from commercially available graphite following the Hummers method as previously described in our previous articles [18,19,23]. We have utilized the same 2D-GO nanoflakes in this study which is already reported in our previous articles [19,23]. To prepare GO suspension in DMF, 0.65 mg of 2D-GO nanoflakes were dissolved in 160 microliter of DMF and sonicated for 2.5 hours.…”

“…The room temperature PL spectra of the pure 8CB LC and its composites with GO nanoflakes are presented in figure 5. The pure 8CB LC exhibits a strong PL emission peak at 336 nm, whereas 2D-GO nanoflakes emit a violet band of 362 nm, (see supplementary figure S2), attributed to the n-π* transition of the isolated sp 2 domains within the carbon-oxygen sp 3 matrix [19,26]. In this study, we have not contemplated about the contribution of the disorderinduced long-wavelength PL band (visible at ¤ 700 nm) of the GO nanoflakes as the 8CB/GO composites only show a single PL emission nearly at 340 nm.…”

“…Moreover, the incorporation of specific nanoparticles has also produced an induced photoluminescence in a non-luminescent LC material [17]. Despite using several kinds of nanoparticles and quantum dots, fewer investigations have been carried out with the two-dimensional (2D) nanosheets or flakes like graphene oxide (GO) or reduced graphene oxide (rGO) [18,19].…”