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ISSN: 2637-4609

Archives of Organic and Inorganic Chemical Sciences

Research Article(ISSN: 2637-4609)

Thermodynamic and Spectroscopic, Characterization of A Weakly Polar Liquid Crystalline Compound Influenced Polyvinyl Pyrrolidone Capped Gold Nanoparticles Volume 5 - Issue 3

Bhupendra Pratap Singh1, Samiksha Sikarwar2, Shivangi Tripathi1, Rajiv Manohar1* and Kamal Kumar Pandey3*

  • 1Liquid Crystal Research Laboratory, Department of Physics, University of Lucknow, India
  • 2School of Physical and Decision Sciences, Babasaheb Bhimrao Ambedkar University, India
  • 3Shri JNMPG College, India

Received:June 24, 2021   Published:July 23, 2021

*Corresponding author:Kamal Kumar Pandey, Rajiv Manohar, Shri JNMPG College, India. Liquid Crystal Research Laboratory, Department of Physics, University of Lucknow, India

DOI: 10.32474/AOICS.2021.05.000214

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The dispersion of colloidal polyvinyl pyrrolidone (PVP) capped gold nanoparticles (GNPs) in an azoxybenzene-based nematic liquid crystal (NLC), namely 4,4’- di pentyl azoxy benzene (D5AOB) has been studied. The present study reported the differential scanning calorimetry (DSC), polarized light microscopy, UV-Vis’s absorption spectroscopy, photoluminescence (PL) and Fouriertransform infrared spectroscopy (FTIR) of GNPs doped NLCs. Three different concentrations of GNPs have been dispersed in pure D5AOB viz 0.25, 0.5, and 1.0 wt%. It has been observed that, with the increase the GNPs concentration, crystal to nematic phase (Cr-Ne) transition temperature does not change sufficiently but nematic to isotropic temperature decrease significantly. This study reported that the 76% and 46% enhancement of UV-Vis’s absorbance and photoluminescence (PL) intensity respectively with the suitable amount of GNPs dispersion in D5AOB. The increase in the surface area of GNPs has been attributed to increase in the PL intensity, resulting in increased emissions due to increased scattering of excitation.

Keywords:Colloidal gold nanoparticles; Nematic liquid crystals; Differential Scanning Calorimetry (DSC); UV-Vis’s absorbance; Photoluminescence; Fourier Transform Infrared Spectroscopy (FTIR).

Abstract| Introduction| Experimental Section| Results and Discussion| Conclusion| Acknowledgments| References|