NNN 25P PbS nanoparticles for determination of metal traces
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REVENKO, M., GAVRILUŢĂ, Anatolie, GHERMAN, Corneliu. NNN 25P PbS nanoparticles for determination of metal traces. In: Materials Science and Condensed Matter Physics, 13-17 septembrie 2010, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2010, Editia 5, p. 220.
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Materials Science and Condensed Matter Physics
Editia 5, 2010
Conferința "Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 13-17 septembrie 2010

NNN 25P PbS nanoparticles for determination of metal traces


Pag. 220-220

Revenko M.1, Gavriluţă Anatolie12, Gherman Corneliu2
 
1 Moldova State University,
2 Institute of Applied Physics
 
Disponibil în IBN: 21 aprilie 2021


Rezumat

Due to the amazing properties of nano-sized materials and the progress of the last two decades in nanotechnology, nowadays researchers face the task of finding of methods of the production, on an industrial scale of different nanomaterials with specific, controlled properties for various applications, including those on the basis of quantum dots. We propose a new method of synthesis of PbS nanoparticles in aqueous solutions of a natural polymer, e. g. gelatin, and present the results of investigation of their optical properties as function of such synthesis conditions as concentration of reagents, germination and growth temperature, molar ratio S/Pb and pH of the solution. The modification of the reaction parameters to obtain PbS nanoparticles offers the possibility to obtain the nanocrystals with the size in the range 2-20 nm (Fig. 1), which can be seen from the presence of the excitonic bands in photoluminescence / optical absorption spectra within the range 800-1500 nm. The quenching of PbS nanoparticles’ luminescence in the presence of metal ions (Hg2+, Ag+, Cu2+, Cd2+, Co2+, Ni2+, Zn2+, Fe2+) was used as the basis for the investigation of analytical aspects of these solutions. Since the solubility product (SP) of the sulfides of the above mentioned metals is less than or close to the SP of lead sulfide, an interaction between these ions with PbS nanoparticule is assumed to take place. The influence of each type of ions was studied in order to check the validity of this assumption. The quenching strength of luminescence of PbS nanoparticles decreasing in the order Cu2+ > Ag+ > Hg2+ > Cd2+ ~ Co2+ ~ Ni2+ ~ Zn2+ ~ Fe2+ was established.The presence of Cu2+ ions affects the photoluminescence of nanoparticles most severely. The contribution of Hg2+ and Ag+ (as well as other ions) was found to be less important and even negligible for their small concentrations. This effect is proposed to be used in developing of an original method to determine small quantities of copper. This method will allow to detect concentrations down to 6.3 ppm of copper (Fig. 2) and can be used for the analysis of copper in the real samples in the presence of mercury and silver.