Kayode Sanusi, Ph.D., MNYA

Rank: Lecturer I
Office: Room: 216 E White House, Department of Chemistry, OAU, Ile-Ife.
Email: sosanusi@oauife.edu.ng
OAU Scholar link: http://scholar.oauife.edu.ng/sosanusi/

Our special interest lies in photoactive molecules. Materials with the ability to modulate light intensity in a predictable manner is important to us for a number of applications such as nonlinear optics (NLO). In particular, we care for those that exhibit reverse saturable absorption (RSA) properties where they are used as the main component in optical limiting (OL) devices. An OL device is used to provide protection for sensitive optical sensors and, the human eye from laser induced damage. Highly conjugated macrocycles such as phthalocyanines (Pc), porphyrins, and their analogues, and other multi-pyrrole-like molecules are important for this application. Their exciting optical properties and the versatility of synthesis that allows exhaustive functionalization of their core/or chromophore made them compounds of choice for this application. Our research is geared towards the development of ideal optical limiters using these sets of molecules. The design, development and fabrication of the device form the focus of our research. Several phthalocyanine-nanomaterial composites involving quantum dots (Qdots), single-walled carbon nanotube (SWCNT-2), magnetite nanoparticles etc. have been developed to meet the characteristics necessary to fabricate the ideal optical limiting device (see below). Our other areas of interest include development of electrocatalysts for formate oxidation, organic photovoltaic cells’ fabrication, organic pollutants removal using polymer-based molecular sieve and development of polymer-based mesoscopic material for CO capture.
Some of the materials already developed and the expected RSA behaviour.Area of Specialization / Research Interest: Nanotechnology, renewable energy, photophysics, photochemistry and computational chemistry.

Selected Publications:
i. Sanusi, K.; Amuhaya, E.K. and Nyokong, T. (2014). Enhanced optical limiting behavior of an indium phthalocyanine-single-walled carbon nanotube composites: an investigation of the effects of solvents. J. Phys. Chem. C. 118, 7057-7069.
ii. Sanusi, K. and Nyokong, T. (2014). Indium phthalocyanine-CdSe/ZnS quantum dot nanocomposites showing size dependent and near ideal optical limiting behavior. Opt. Mater. 38, 17-23.
iii. Sanusi, K.; Stone, J.M. and Nyokong, T. (2015). Nonlinear optical behavior of indium phthalocyanine tethered to magnetite or silica nanoparticles. New J. Chem. 39, 1665-1677.
iv. Sanusi, K. and Nyokong, T. (2015). Enhanced optical limiting behavior of indium phthalocyanine derivatives when in solution or embedded in poly(acrylic acid) or poly(methyl methacrylate) polymers. J. Photochem. Photobiol. A: Chem. 303, 44-52.

v. Agunbiade, R.Y.; Jasinski, J.P.; Millikan, S.P.; Sanusi, K.; Yilmaz, Y.; Ümit C.; Fadare, O.A. and Obafemi, C.A. (2017). Isolation, characterization, crystal structure, free radical scavenging and computational studies of 9-[4-(propan-2-yl) phenyl]-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8 (2H)-dione from Garcinia kola seeds. J. Mol. Str., 1144, 396- 405.
vi. Gugu Kubheka, Sanusi, K.; John Mack and Tebello Nyokong (2018). Optical limiting properties of 3,5-dipyrenylvinyleneBODIPY dyes at 532 nm. Spectrochim. Acta A: Mol. Bio. Spectr. 191, 357-364.