A study on the spectroscopic, energy band, and optoelectronic properties of α,ω-dihexylsexithiophene/tris(8-hydroxyquinolinate) gallium blends; DH6T/Gaq3 composite system

Fahmi F Muhammad; Mohd Yazid Yahya; Kamal Aziz Ketuly; Abdulkader Jaleel Muhammad; Khaulah Sulaiman

doi:10.1016/j.saa.2016.06.031

A study on the spectroscopic, energy band, and optoelectronic properties of α,ω-dihexylsexithiophene/tris(8-hydroxyquinolinate) gallium blends; DH6T/Gaq3 composite system

Spectrochim Acta A Mol Biomol Spectrosc. 2016 Dec 5:169:144-51. doi: 10.1016/j.saa.2016.06.031. Epub 2016 Jun 18.

Authors

Fahmi F Muhammad¹, Mohd Yazid Yahya², Kamal Aziz Ketuly³, Abdulkader Jaleel Muhammad⁴, Khaulah Sulaiman⁵

Affiliations

¹ Center for Composites, Institute for Vehicle Systems & Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia; Soft Materials & Devices Lab, Department of Physics, Faculty of Science & Health, Koya University, Koya, Kurdistan Region, Iraq.
² Center for Composites, Institute for Vehicle Systems & Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia. Electronic address: yazidyahya@utm.my.
³ Department of Biochemistry, Faculty of Medicine, University of Duhok, Kurdistan Region, Iraq.
⁴ Department of Physics, College of Science, University of Kirkuk, Kirkuk, Iraq.
⁵ Low Dimensional Materials Research Centre (LDMRC), Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.

PMID: 27372510
DOI: 10.1016/j.saa.2016.06.031

Abstract

In this work the optical response, spectroscopic behaviour, and optoelectronic properties of solution and solid state composite systems based on α,ω-dihexylsexithiophene/tris(8-hydroxyquinolinate) gallium (DH6T/Gaq3) are studied upon the incorporation of different molar percentages of Gaq3. UV-vis, PL, FTIR spectrophotometers and SEM technique were utilized to perform the investigations. The results showed a reduced energy band (Eg) (from 2.33eV to 1.83eV) and a broadened absorption spectrum for the blend system when 29.8% molar of Gaq3 was incorporated. These were attributed to the enhanced intermolecular interactions that are brought about by the increased strength of π-π overlap between the molecular moieties. A mathematical formula was developed to interpret the non-monotonic change occurred in Eg, while numerical calculations have been made to assign the type and nature of the electronic transitions governing the spectroscopic behaviour of the system. The results were elaborated and comprehensively discussed in terms of the exciton generation, energy band theory, molecular interactions, and spatial geometry.

Keywords: Composites; DH6T/Gaq3; Energy band; Optoelectronics; Spectroscopy.