Remarkable difference in pre-cation exchange reactions of inorganic nanoparticles in cases with eventual complete exchange

Abstract

Postsynthetic modification of inorganic nanoparticles (NPs) involving appropriate cation pairs at or near ambient conditions can exchange their spatial positions. The characterization of final products from these reactions although attracted...

The thermal response of lead sensitized terbium emission in group II sulfide nanoparticles: importance of spatial proximity and band gap engineering

“…These non-perturbing structural trends in the pre-cation exchange reaction conditions are consistent with our previous reports. 8,9,13…”

“…These observations are consistent with our previous reports. 8,9,11,12 Panels (a)-(c) of Fig. 2 summarize the corresponding structural characterization of the Zn(Tb)S/Pb, in which the Zn(Tb)S NPs are postsynthetically modified by Pb 2+ with [Zn(Tb)S] : [Pb 2+ ] = 1 : 10 À2 .…”

“…These non-perturbing structural trends in the pre-cation exchange reaction conditions are consistent with our previous reports. 8,9,13 (b) XPS. The existence of constituent elements Zn, Tb, S, and Pb in the corresponding NPs can be confirmed by the X-ray photoelectron spectra (XPS) shown in panels (a)-(d) of Fig.…”

“…Further experiments revealed that this Pb 2+ induced sensitization of Tb 3+ emission is specific, at least among Hg 2+ , Cd 2+ , Ca 2+ , Mg 2+ , Na + , and K + . This finding of Pb specific Tb 3+ emission brightening in the pre-cation exchange reaction conditions in the Zn(Tb)S/Pb NPs, at least among the Zn(Tb)S/M [M = Pb, Hg, Cd, Ca, Mg, Na, and K] NPs, [8][9][10] laid the motivation of the present study, in order to gain mechanistic insight.…”

“…We further proposed that Tb 3+ –Pb 2+ in ZnS NPs provides a favorable energy level alignment that ensures more effective co-localization of photogenerated electron–hole pairs at the Tb 3+ center, thus resulting in the sensitization. 9 Structural insights from the X-ray diffraction (XRD) studies indicate formation of an inhomogeneous phase with a deviation towards the ordinate in the Vegard's law plot. This suggests a clustering with net cation–cation repulsion in the presence of random cation–anion attraction.…”