International Science Index


10008878

Synthesis and Characterization of Nickel and Sulphur Sensitized Zinc Oxide Structures

Abstract:

The use of nanostructured semiconducting material to catalyze degradation of environmental pollutants still receives much attention to date. One of the desired characteristics for pollutant degradation under ultra-violet visible light is the materials with extended carrier charge separation that allows for electronic transfer between the catalyst and the pollutants. In this work, zinc oxide n-type semiconductor vertically aligned structures were fabricated on silicon (100) substrates using the chemical bath deposition method. The as-synthesized structures were treated with nickel and sulphur. X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy were used to characterize the phase purity, structural dimensions and elemental composition of the obtained structures respectively. Photoluminescence emission measurements showed a decrease in both the near band edge emission as well as the defect band emission upon addition of nickel and sulphur with different concentrations. This was attributed to increased charger-carrier-separation due to the presence of Ni-S material on ZnO surface, which is linked to improved charge transfer during photocatalytic reactions.

References:
[1] Q. Zhou, J. Z. Wen, P. Zhao, W. A. Anderson, “Synthesis of Vertically-Aligned Zinc Oxide nanowires and Their Application as a Photocatalyst” Nanomaterials vol. 7 pp. 1-13, January 2017.
[2] S. Dhara, P. K. Giri, “ZnO Nanowire Heterostructures: Intriguing Photophysics and Emerging Applications” Rev. Nanosci. Nanotechnol. vol. 2 pp. 1-24, March 2013.
[3] A. Syed, M. Kalloudis, V. Koutsos, E. Mastropaolo, “Controlled hydrothermal growth of vertically-aligned zinc oxide nanowires using silicon and polymide substrates” Microelectronic Engineering vol. 145 pp. 86-90, September 2015.
[4] A. Bera, D. Basak, “Photoluminescence and photoconductivity of ZnS-coated ZnO nanowires” ACS Appl. Mater. Interfaces vol. 2 pp. 408-412, January 2009.
[5] W. S. Chi, J. W. Han, S. Yang, D. K. Roh, H. Lee, J. H. Kim, “Employing electrostatic self-assembly of tailored nickel sulphide nanoparticles for quasi-solid-state dye-sensitized solar cells with Pt-free counter electrodes” Chem. Commun. vol. 48 pp 9501-9503 August 2012.
[6] J. Zhang, S. Z. Qiao, L. Qi, J. Yu, “Fabrication of NiS modified CdS nanorod p-n junction photocatalysts with enhanced visible-light photocatalytic H2-production activity” Phys. Chem. Chem. Phys. vol. 15 pp. 12088-12094, April 2013.
[7] C.-H. Lai, M.-Y. Lu, L.-J. Chen, “Metal sulfide nanostructures: synthesis, properties and applications in energy conversion and storage” J. Mater. Chem. vol. 22 pp. 19-30, November 2011.
[8] B.-R. Huang, J.-C. Lin, “A facile synthesis of ZnO nanotubes and their hydrogen sensing properties” Appl. Surf. Sci. vol. 280 pp. 945-949, September 2013.
[9] K. Vanheusden, C. H. Seager, W. L. Waren, D. R. Tallant, J. A. Voigt, “Correlation between photoluminescence and oxygen vacancies in ZnO phosphors” Appl. Phys. Lett. vol. 68 pp. 403-405, January 1996.
[10] D Liu, Y. Lv, M. Zhang, Y. Liu, Y. Zhu, R. Zong, Y. Zhu, “Defect-related photoluminescence and photocatalytic properties of porous ZnO nanosheets” J. Mater. Chem. A vol. 2 pp. 15377-15388, July 2014.
[11] J. Kegel, F. Laffir, I. M. Povey, M. E. Pemble, “Defect-promoted photo-electrochemical performance enhancement of orange-luminescent ZnO nanorod-arrays” Phys. Chem. Chem. Phys. vol. 19 pp. 12255-12268, April 2017.
[12] R. Raji, K. G. Gopchandran, “ZnO nanostructures with tunable visible luminescence: Effects of linetikc of chemical reduction and annealing” J. Sci. Adv. Mater. Devices vol. 2 pp. 51-58, March 2017.
[13] K. Bandopadhyay, J. Mitra, “Zn interstitials and O vacancies responsible for n-type ZnO: what do the emission spectra reveal?” RSC Adv. vol. 5 pp. 23540-23547, February 2015.