INFLUENCE OF IONS OF HEAVY METALS ON THE PHOTOLUMINESCENCE OF NANOCRYSTALS AGINS2 /ZNS
Journal Title: Сенсорна електроніка і мікросистемні технології - Year 2017, Vol 14, Issue 1
Abstract
The aim of this work is to investigate the influence of ions of heavy metals Cu2+, Pb2+, Co2+, Ni2+, Cd2+, Ag+ , and ions, which are common components of natural and drinking water (Na+ , K+ , Ca2+, Mg2+), on the photoluminescence of nanocrystals AgInS2 with ZnS shell (NCs AgInS2 /ZnS) to figure out the possibility of the further use of the nanocrystals to determine the concentrations of the ions. Photoluminescence measurements of NCs AgInS2 /ZnS were performed using scanning spectrofluorometer “Synergy HT Multi-Mode Microplate Reader”. Photoluminescence spectra were obtained by spectrofluorometer “Cary Eclipse”. Experimental data obtained confirm the assumption on the relationship between the level of quenching of NCs AgInS2 /ZnS photoluminescence under exposure to the heavy metal ions and solubility constant of their sulfides. The order of studied ions by the degree of influence on the NC photoluminescence generally coincides with their order of the decrease of the solubility of their sulfides, with the exception of ions Cd2+ and Ag+ , which, when substituting zinc ions in the shell of nanocrystals may contribute to the formation of a certain amount of new centers of emission. The concentration of ions Cu2+, which caused a statistically significant quenching of NCs AgInS2 /ZnS photoluminescence, is below their maximum allowable concentration in natural waters. It opens up prospects of NCs AgInS2 /ZnS for developing methods for environmental monitoring of the copper ions. Such methods have several advantages over conventional methods, among them - high sensitivity to nanomolar concentrations of copper ions, high speed of analysis and safety for both personnel and the environment.
Authors and Affiliations
I. Podgurska, A. Rachkov
Keywords
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- EP ID EP398549
- DOI 10.18524/1815-7459.2017.1.96438
- Views 96
- Downloads 0
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