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Synthesis and characterisation of titanium dioxide nanoparticles sensitised with natural chlorophyll dye extracted from Mentha leaves

A. MOLEA1, V. POPESCU1,* , G. L. POPESCU2, R. C. SUCIU3, A. DINESCU4, M. MOLDOVAN5

Affiliation

  1. Technical University of Cluj-Napoca, Faculty of Material and Environmental Engineering, Physics and Chemistry Department, No.103-105 Muncii Avenue, 400641 Cluj-Napoca, Romania
  2. Technical University of Cluj-Napoca, Faculty of Mechanical Engeneering, The Department of Automotive Engineering and Transports, No.103-105 Muncii Avenue, 400641 Cluj-Napoca, Romania
  3. National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, PO 5 Box 700, 400293 Cluj-Napoca, Romania
  4. National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Bucharest, Romania
  5. Babes Bolyai University - “Raluca Ripan” Institute of Chemistry, 30 Fântânele Street, 400294 Cluj-Napoca, Romania

Abstract

For this study a facile ultrasounds assisted method was used for synthesis of chlorophyll-sensitised titanium dioxide nanoparticles. The chlorophyll was extracted from Mintha leaves by a solvent extraction method and based on ultravioletvisible spectroscopy it was showed that was extracted chlorophyll (a+b) mixture with concentration of 87 mg/L. Based on Xray diffraction patterns analysis was demonstrated that chlorophyll does not change the structural matrix of titanium dioxide. Field emission – scanning electron microscopy images revealed the formation of nanoparticles with dimensions between 3 nm and 36 nm. Ultraviolet-visible and photoluminescence spectra confirmed that all chlorophyll-sensitised titanium dioxide nanoparticles absorb the radiation from the visible range. Also, we have proposed a sensitisation mechanism of titanium dioxide particles with natural chlorophyll dye..

Keywords

Natural dye, Chlorophyll, Sensitisation, Titanium dioxide, Nanostructure, Optical properties.

Submitted at: Sept. 20, 2016
Accepted at: April 6, 2017

Citation

A. MOLEA, V. POPESCU, G. L. POPESCU, R. C. SUCIU, A. DINESCU, M. MOLDOVAN, Synthesis and characterisation of titanium dioxide nanoparticles sensitised with natural chlorophyll dye extracted from Mentha leaves, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 3-4, pp. 272-277 (2017)