Synthesis of new liquid crystals embedded gold nanoparticles for photoswitching properties

Rahman, Lutfor; Biswas, Tanmay; Sarkar, Shaheen M.; Yusoff, Mashitah M.; Yuvaraj, A. R.; Kumar, Sandeep

doi:10.1016/j.jcis.2016.06.039

Cited by 15 publications

(8 citation statements)

References 59 publications

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“…Since the azobenzene-based LC materials have the potential to be used in optical switching and image storage techniques, ,, we have also observed optical textures after the UV illumination via masked or covered region at 110 °C (isothermally) of the representative compound 2-12 inserted in the planar cell (Figure a–c). The cell was irradiated with UV light (λ = 365 nm, intensity = 10 mW/cm 2 ), and the unmasked region became completely dark/transparent within 6 s, as shown in Figure b.…”

Section: Resultsmentioning

confidence: 94%

“…3 Moreover, systems such as azobenzene LCs with gold nanoparticles and some U-shaped The Journal of Physical Chemistry B azo-based bent-core LCs have been studied for optical storage devices due to their photoswitching behavior. 44,45 Since the bent-core molecules studied here contain an azo (NN) moiety, they can exhibit photo-induced LC phase transition. With this aim, we have studied the photoresponsive properties of the compounds in their LC state upon UV irradiation (λ = 365 nm, intensity = 10 mW/ cm 2 ), which were in situ-observed by POM (details of UV light are given in the Supporting Information, page S17).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…A phototropic bent-core nematic material exhibits flexoelectric domains whose periodicity and DC threshold voltage have been tuned by the photoisomerization process upon illumination with light of different wavelength and intensity useful for diffraction gratings . Moreover, systems such as azobenzene LCs with gold nanoparticles and some U-shaped azo-based bent-core LCs have been studied for optical storage devices due to their photoswitching behavior. , …”

Section: Resultsmentioning

confidence: 99%

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Structural Understanding, Photoswitchability, and Supergelation of a New Class of Four Ring-Based Bent-Shaped Liquid Crystal

et al. 2019

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Herein, we report a new type of azobenzene-based unsymmetrical bent-core molecules exhibiting photoswitchability in the liquid crystalline state, solid state, and solution state and in mixture upon UV irradiation and intense visible light. The compounds exhibited solid-state photochromism upon exposure to UV light, whereas in liquid crystalline state, reversible phase transitions were observed via both UV irradiation and intense visible light exposure. Crystal structure analysis reveals the basic structural understanding such as nonplanar bent molecular shape, antiparallel arrangement of the polar bent molecules, intra-and intermolecular hydrogen bonding, and different π−π interactions and interdigitation of long alkyl chains. The compounds are also found to act as supergelator toward various organic solvents. Hence, this is an excellent example of such potential bent-shaped liquid crystals that promise an immense perspective for device applications such as optical storage, molecular switches, etc.

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Section: Resultsmentioning

confidence: 94%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Structural Understanding, Photoswitchability, and Supergelation of a New Class of Four Ring-Based Bent-Shaped Liquid Crystal

et al. 2019

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“…The conformational change is associated with a change of dipole moment from 0 D for the trans-isomer to 3 D for the cis-isomer [46]. Therefore, the polarity of the surface is reduced and particles tend to precipitate, which also known for other systems [47]. Because of this effect, the absorption of AzoC 2 at 325 nm shows an exponential decay over the time of irradiation in relation to the excitonic bandgap at 524 nm.…”

Section: D Hybrid Perovskite With Azobenzene Ligands On the Surfacementioning

confidence: 97%

Interfacial charge transfer processes in 2D and 3D semiconducting hybrid perovskites: azobenzene as photoswitchable ligand

Fillafer¹,

Seewald²,

Schmidt‐Mende³

et al. 2020

Beilstein J. Nanotechnol.

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In the vast majority of studies on semiconductor particles ligands or capping agents are used that bind to the surface of the particles covering them with an electrically insulating shell. Since the transport of charge carriers and/or energy across interfaces is desirable for a variety of applications, the use of π-conjugated ligands becomes increasingly interesting. Among them are compounds that react to external stimuli. Molecular switches in particular are fascinating because the properties of the interfaces can be potentially adjusted as required. However, there is debate about how the properties of such special ligands are influenced by the presence of a semiconductor and vice versa. Here ammonium-modified azobenzene compounds were selected as prototypes for molecular switches and organic–inorganic hybrid perovskites as semiconductor materials. The class of ammonium–lead–halide phases as prototypes is peculiar because, in addition to the surface functionalization of 3D crystals, organic compounds can actually be incorporated into the crystal as 2D phases. Thus, for example, layered Ruddlesden–Popper phases are obtained. We present photoswitchable azobenzene ligands with different head-group lengths for the synthesis of 2D and 3D hybrid perovskite phases. The energy transfer mechanisms are influenced by the length of the molecular spacer moiety, which determines the distance between the π system and the semiconductor surfaces. We find huge differences in the photoswitching behaviour between the free, surface-coordinated and integrated ligands between the perovskite layers. Photoswitching of azobenzene ligands incorporated in 2D phases is nearly quenched, while the same mechanism for surface-coordinating ligands is greatly improved, compared to the free ligands. The improvement originates from an energy transfer from perovskite to azobenzene, which is strongly distance-dependent. This study provides evidence for the photoswitching of azobenzenes as ligands of hybrid perovskites, which depends on the spacing between the chromophore and the perovskite phase.

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“…Compound 22 shows a nematic to isotropic transition at 158.9 °C, whereas compound 23 exhibit a smectic A to isotropic transition at exactly 157.6 °C. The number of fluorine substituent present in the compound influence the transition temperature by increasing the number of fluorine atom, the transition temperature will decrease [ 35 ]. Compound 22

…”

Section: Structure–property Relationshipmentioning

confidence: 99%

Liquid Crystals Investigation Behavior on Azo-Based Compounds: A Review

Razali

Jamain

2021

Polymers

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Liquid crystal is an intermediate phase between the crystalline solid and an isotropic liquid, a very common substance in our daily lives. Two major classes of liquid crystal are lyotropic, where a liquid crystal is dissolved in a specific solvent under a particular concentration and thermotropic, which can be observed under temperature difference. This review aims to understand how a structure of a certain azo compound might influence the liquid crystal properties. A few factors influence the formation of different liquid crystals: the length of the alkyl terminal chain, inter/intra-molecular interaction, presence of spacer, spacer length, polarization effects, odd-even effects, and the presence of an electron-withdrawing group or an electron-donating group. As final observations, we show the compound’s different factors, the other liquid crystal is exhibited, and the structure–property relationship is explained. Liquid crystal technology is an ideal system to be applied to products to maximize their use, especially in the electronic and medical areas.

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Synthesis of new liquid crystals embedded gold nanoparticles for photoswitching properties

Cited by 15 publications

References 59 publications

Structural Understanding, Photoswitchability, and Supergelation of a New Class of Four Ring-Based Bent-Shaped Liquid Crystal

Structural Understanding, Photoswitchability, and Supergelation of a New Class of Four Ring-Based Bent-Shaped Liquid Crystal

Interfacial charge transfer processes in 2D and 3D semiconducting hybrid perovskites: azobenzene as photoswitchable ligand

Liquid Crystals Investigation Behavior on Azo-Based Compounds: A Review

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