Ligand Counting and Size Determination of Quantum Dots Using Electronegative Matrix-Assisted Laser Desorption Ionization Mass Spectrometry
Park, Sanghwang
;
Ro, Dongyeon
;
Lee, Gyudong
;
Ma, Jinhyuk
;
Joo, Taiha
;
Choi, Chang Hyuck
;
Shin, Seung Koo
;
Lim, Sung Jun
;
Seo, Jongcheol
Surface-capping ligands on quantum dots (QDs) modify the physical and chemical properties of QDs to enable diverse applications. Accurate qualitative and quantitative analyses of these ligands are therefore essential for the advancement of QD research; however, conventional methods (e.g., UV–vis, TEM) seldom provide direct stoichiometric insight. MS can offer a solution, but traditional MALDI induces an excessive ligand loss. Here, we employed a highly electronegative, fluorinated porphyrin (TPF