Synthesis and characterization of azo benzothiazole chromophore based liquid crystal macromers: Effects of substituents on benzothiazole ring and terminal group on mesomorphic, thermal and optical properties

Karim, Md. Rabiul; Sheikh, Md. Rezaul Karim; Salleh, Noordini M.; Yahya, Rosiyah; Hassan, Aziz; Hoque, Md. Asadul

doi:10.1016/j.matchemphys.2013.04.003

Cited by 27 publications

(12 citation statements)

References 32 publications

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“…The electrical properties of GO with K-Azo shows the increment due to the K-Azo chromophore that produces good absorption. 61 A similar trend was observed for rGO and rGO with K-Azo. The observed values of current were 2.68 × 10 −3 A/cm 2 for rGO thin film (Figure 7C) and 5.02 × 10 −3 A/cm 2 for rGO with K-Azo at 10 V thin film (Figure 7D).…”

Section: Electrical Propertiessupporting

confidence: 70%

“…Reported literature dictated that azobenzene owned strong absorption properties that gave colour to these sensitizers and provided intrinsic advantages of good photocatalysts. 60,61 Furthermore, the delocalized electrons along a chain of bonds are responsible for the absorption. 32 Particularly, the organic sensitizer compound will be beneficial to the emerging organic PV solar cell technologies, that is, DSSCs, polymer solar cells, perovskite solar cells, OPV, and so on, which contributed to excellent absorption rate to enhance the overall power conversion efficiency.…”

Section: Ultraviolet-visible Spectroscopy (Uv-vis)mentioning

confidence: 99%

“…The electrical properties of rGO thin film with K-Azo also displayed the same increment because of the promotion of good absorption. [60][61][62] Table 1 is generated from Figure 7 by typical I-V calculation. As evidenced, the overall conductivity was increased with the presence of K-Azo.…”

Section: Electrical Propertiesmentioning

confidence: 99%

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Organic sensitization of graphene oxide and reduced graphene oxide thin films for photovoltaic applications

et al. 2021

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In this work, a new organic compound (K-Azo) was introduced to enhance the electrical and optical performance of graphene oxide (GO) and reduced GO (rGO) nanostructured films. The improved and modified chemical vapour method was employed for the synthesis of GO and rGO. The photophysical characterization of thin films was performed by applying analytical techniques including X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, ultraviolet-visible, and Raman spectroscopy. The electrical properties (I-V characteristic) of GO and rGO thin films displayed higher conductivity which was 4.07 × 10 −7 and 1.10 × 10 −3 S/cm, respectively in the presence of organic sensitizer. However, GO and rGO thin films showed 9.91 × 10 −7 and 6.17 × 10 −4 S/cm, respectively in the absence of K-Azo sensitizer.Optical and electrical investigations indicated that the characteristics of GO and rGO were improved due to the presence of organic sensitizer. The longrange π-electron delocalization in organic sensitizer contributed to higher conductivity for potential photovoltaic solar cell applications.

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Section: Electrical Propertiessupporting

confidence: 70%

Section: Ultraviolet-visible Spectroscopy (Uv-vis)mentioning

confidence: 99%

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Organic sensitization of graphene oxide and reduced graphene oxide thin films for photovoltaic applications

et al. 2021

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“…Extracted natural dye, however, has low yields of extract and scarce resources [10]. Organic dye such as azobenzene has outstanding chromophores with strong absorption in visible region and intrinsic advantages of good photo and thermal stability [11,12]. Azobenzene is a reactive precursor for functional group conversion and attachment such as vinyl and alkoxy chain with enhanced optical properties [13,14].…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Kojic Acid-Azo Dyes on TiO₂ Thin Films for Dye Sensitized Solar Cells Applications

Sie

Ngaini

2017

Journal of Solar Energy

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Sensitization of heavy metal free organic dyes onto TiO 2 thin films has gained much attention in dye sensitized solar cells (DSSCs). A series of new kojic acid based organic dyes KA -were synthesized via nucleophilic substitution of azobenzene bearing different vinyl chains A -with kojyl chloride . Azo dyes KA -were characterized for photophysical properties employing absorption spectrometry and photovoltaic characteristic in TiO 2 thin film. The presence of vinyl chain in A -improved the photovoltaic performance from 0.20 to 0.60%. The introduction of kojic acid obtained from sago waste further increases the efficiency to 0.82-1.54%. Based on photovoltaic performance, KA achieved the highest solar to electrical energy conversion efficiency ( = 1.54%) in the series.

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“…Moreover, many mesogenic compounds containing azo central linkage have been studied as most of them exhibit LC properties above room temperature [7]. In addition, the photochromic azo group can be used to control phase behaviour and optical properties of LC materials [16]. Like azo (N=N) linking group, ester (COO) group is also considered as a versatile and most commonly used linking unit in LC materials because it increases the polarisability of molecules and provides relatively stable mesophase.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structure, Mesophase Behaviour and Optical Property of Azo-ester Bridged Compounds

Karim¹,

Sheikh²,

Islam³

et al. 2019

J. Sci. Res.

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Azo-ester mesogen containing two liquid crystalline compounds C1-C2 having polymerizable acrylate functional group as the terminal were designed and synthesized. The chemical structures and purity of the synthesized compounds were confirmed by different spectroscopic techniques such as FT-IR, 1 H NMR and 13 C NMR. X-ray crystal structure showed that compound C1 exhibited more stable E configuration with two bulky groups in the opposite sides of the N=N double bond motifs. The 1, 2-diphenyldiazene fragment in the structure of C1 is essentially planar with RMS deviation from planarity of 0.0555 Å. Analysis of the crystal packing of compound C1 revealed its intriguing supramolecular sheet-like multilayer molecular packing stabilized by C-H…O interaction involving the phenyl and acryloyl hydrogen with the carbonyl oxygen and alkoxy oxygen atoms. Thermogravimetric investigation demonstrated that both of the compounds exhibited excellent thermal stability and their thermal degradation was influenced by the terminal substituent. The DSC and POM studies confirmed that compounds C1-C2 exhibited enantiotropic liquid crystalline mesophase behaviour. Optical investigations demonstrated that both of the compounds showed strong absorption band around 300-420 nm and exhibited blue fluorescence emission.

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Synthesis and characterization of azo benzothiazole chromophore based liquid crystal macromers: Effects of substituents on benzothiazole ring and terminal group on mesomorphic, thermal and optical properties

Cited by 27 publications

References 32 publications

Organic sensitization of graphene oxide and reduced graphene oxide thin films for photovoltaic applications

Organic sensitization of graphene oxide and reduced graphene oxide thin films for photovoltaic applications

Incorporation of Kojic Acid-Azo Dyes on TiO₂ Thin Films for Dye Sensitized Solar Cells Applications

Synthesis, Crystal Structure, Mesophase Behaviour and Optical Property of Azo-ester Bridged Compounds

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Synthesis and characterization of azo benzothiazole chromophore based liquid crystal macromers: Effects of substituents on benzothiazole ring and terminal group on mesomorphic, thermal and optical properties

Cited by 27 publications

References 32 publications

Organic sensitization of graphene oxide and reduced graphene oxide thin films for photovoltaic applications

Organic sensitization of graphene oxide and reduced graphene oxide thin films for photovoltaic applications

Incorporation of Kojic Acid-Azo Dyes on TiO2 Thin Films for Dye Sensitized Solar Cells Applications

Synthesis, Crystal Structure, Mesophase Behaviour and Optical Property of Azo-ester Bridged Compounds

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Incorporation of Kojic Acid-Azo Dyes on TiO₂ Thin Films for Dye Sensitized Solar Cells Applications