In order to tell that the didodecyldimethylammonium bromide (DDAB) is the capping ligands that locate the surface of perovskite quantum dots instead of tetraoctylammonium bromide (TOAB), I measured its XPS. Literatures show the N 1s from DDAB is about 402.2 eV, and that N 1s TOAB is about 401 eV. Since they are in the same oxidation state (I guess), it is the local chemical environment that cause the binding energy difference. Could anyone tell me how?
The chemical shift consists of the so called initial state effect (or potential effect) and the final state effect (or relaxation effect). Relaxation means the reaction of the electron shell after the photoemission, giving the photoelectron a little push. Its amount may differ, also in case of same oxidation state and I am sure it *will* differ in this different melecules. If there is time, try Auger-Parameter-XPS using XAES-peaks to check this...
Yongfeng Liu
Окружающая среда должна влиять, так как симметричные тетраалкил бромиды увеличивают стабилизацию воды больше, чем несимметричные.
Article Hydration of tetraalkylammonium salts
The different induction effects of the alkyl groups should not be ignored when comparing the two compounds.
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