Optical and luminescence properties of pure, iron-doped, and glucose capped ZnO nanoparticles

• Published in: Results in physics Vol. 19; p. 103508
• Main Authors: Gudla, Umesh Reddy, Suryanarayana, B., Raghavendra, Vemuri, Emmanuel, K.A., Murali, N., Taddesse, Paulos, Parajuli, D., Chandra Babu Naidu, K., Ramakrishna, Y., Chandramouli, K.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-12-2020; Elsevier
• Subjects: Hexagonal wurtzite structure; Optical bandgap; Photoluminescence; Precipitation method; ZnO nanoparticle; Optical bandgap; Hexagonal wurtzite structure; ZnO nanoparticle; Precipitation method; Photoluminescence
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2020.103508

•ZnO NPs can be prepared by simple and easy chemical precipitation method.•Blue-shifted absorption band takes place due to quantum confinement effect or small and spherical size effect.•Fe doped ZnO behaves as a quencher.•ZnO is biocompatible semiconductor.•Change in intensity changes the peak positions of capped sample more than pure and doped ZnO samples.
Pure, iron-doped, and glucose capped ZnO nanoparticles (NPs) have been synthesized by a chemical precipitation method. The structural, optical, and photoluminescence properties of all the prepared samples are examined systematically. X-ray diffraction patterns of all the samples exhibited a single hexagonal wurtzite structure with an average crystallite size ranging from 1.01 to 1.78 nm. Transmission electron microscope images showed the spherical shaped NPs in the range of between 17 and 19 nm. Fourier transform of infrared spectroscopy (FTIR) studies confirmed the presence of octahedral sites around 470–489 cm−1 and tetrahedral sites at 616 cm−1 in pristine and doped samples. The calculated optical bandgap energy for pure, Fe doped and glucose capped ZnO NPs are found to be 3.82, 3.80, and 3.63 eV, respectively, and the variations in the bandgap is ascribed to the Fermi level, which is in the conduction band resulting in the absorption edge shifting towards the higher/ lower energy. It is observed that Fe doped and glucose capped ZnO NPs showed a strong photoluminescence signal than the pure ZnO NPs. The green emission is quenched. The blue emission is enhanced due to the deactivation of oxygen vacancies on the surfaces due to the smaller particle sizes as a result of the quantum confinement effect.