Effects of silver nanoparticles doping on morphology and luminescence behaviour of ferroelectric liquid crystals Langmuir–Blodgett films

Abstract

We report the deposition of Langmuir-Blodgett (LB) thin films of low-weight dispersed composite systems of ferroelectric liquid crystals (FLCs)-functionalised silver (Ag) nanoparticles. Because of their amphiphilic nature the molecules form stable Langmuir monolayers, which were transferred to silicon substrates. We noticed that absorption wave numbers are present for each bond constituting FLC-nanoparticles composite system, ensuring a complete transfer of molecules from water sub-phase. XRD showed intense peaks at 2θ = 3.2°due to the layer structure of FLC molecules. We infer from the morphology of LB films that doping of nanoparticles do not provide any hindrance to SmC Ã layer structure of FLC molecules. The photoluminescence study indicates blue shift in emission spectra and peak intensity increases with Ag nanoparticles concentration. ARTICLE HISTORY

Highly luminescent, fast switching electro-optical device based on core–shell bimetallic nanoparticles/ ferroelectric liquid crystal composites

“…where Cr, SmC * , SmA * , N * , and I respectively represent crystalline, chiral smectic C, chiral smectic A, chiral nematic, and isotropic phases [43,62]. Optimum aliquots of Au@Ag, Au, and Ag colloids with respective to the desired metallic percentage (0.12, 0.25, and 0.5 wt%) were introduced into 3 mg of FLC matrix and thoroughly blended using a blade.…”

“…Kaur et al reported the establishment of Langmuir-Blodgett thin film compounded systems of FLCs-functionalized Ag NPs. The smectic layer ordering of FLCs is unaffected by doping; however, there is a blue shift in the PL spectra and an amplification in PL intensity with an increase in doping concentration [43]. Thus, doping with plasmonic metal NPs like Au or Ag presents a potential way to tailor the electro-optical parameters and luminescence of the FLC matrix.…”

Mesomorphism behaviour and photoluminescent properties of new asymmetrical 1,2-di(4-alkoxybenzylidene)hydrazines

“…Over the past three years, a wide range of liquid crystalline or photoluminescent liquid crystalline compounds with fascinating properties have been prepared. [7][8][9][10][11][12][13][14][15][16][17][18] We are interested in the synthesis of azine-type derivatives as photoluminescent mesogenic materials following a simple and practical method. In very recent reports we have described the preparation, liquid crystal and photoluminescent properties of 1,2-bis[4-(n-alkoxy)benzylidene]hydrazines (n-alkoxy = O(CH 2 ) n H, n = 1-10, 12, 16 or 18), a symmetrical series of 1,2-disubstituted hydrazines 19…”