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General Chemistry ›› 2018, Vol. 4 ›› Issue (3): 180009-180009.DOI: 10.21127/yaoyigc20180009

Special Issue: Liquid Crystals

• Reports • Previous Articles     Next Articles

Liquid Crystals Decorated Gold Nanoparticles for Photoswitching Properties

Md. Lutfor Rahmana(), Mohd Sani Sarjadia, Shaheen M. Sarkarb, Mashitah M. Yusoffb, A. R. Yuvarajc, Sandeep Kumarc   

  1. a Faculty for Science and Natural Resources, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah, Malaysia
    b Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, 26300 Gambang, Kuantan,
    Pahang, Malaysia
    c Raman Research Institute, Raman Avenue, Sadashivanagar, Bangalore 560080, India
  • Received:2018-03-30 Accepted:2018-04-27 Online:2018-09-23 Published:2018-09-23

Abstract: Liquid crystals decorated gold nanoparticles are synthesized as the molecular architecture consists of the azobenzenes moieties with alkene as the peripheral units, which are connected to gold nanoparticles (Au-NPs) via thiolated phenolic units are in the middle. The morphology and mesomorphic properties were investigated by the field emission scanning electron microscope, high-resolution transmission electron microscopy, differential scanning calorimetry, and polarizing optical microscopy. The aromatic thiolated azobenzene moieties with gold nanoparticles showed smectic A phase with monotropic nature only appeared in the cooling cycle. HR-TEM measurement showed that the functionalized Au-NPs are well dispersed without any aggregation. However, the absorption spectrum of peripheral azobenzene units shows strong absorption maxima in the ultraviolet region at 378 nm due to π-π* transition. For n-π* transition, a weak absorption band is observed in the visible region at 472 nm. The photo-isomerization characteristic is measured using absorption spectroscopy. The photosatur- ation of Au-NPs is found at the time duration of 16 s. The thermal back relaxation is completed after the time interval of 70 min. Moreover, Au-NPs showed excellent stability towards photo-decay. Therefore, Au-NPs compound is suitable in the field of optical storage and molecular switching.

Key words: liquid crystals, gold nanoparticles, photoswitching, molecular switches, optical storage

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