Table 1 Summary of MWs of amphiphilic star-like P4VP-b-PtBA-b-PEO and P4VP-b-PtBA-b-PS triblock copolymers and the corresponding dimension of polymer-capped MAPbBr3/SiO2 core/shell NCs.

SamplesMn,P4VP*
(kg/mol)
Mn,PtBA
(kg/mol)
Mn,PS
(kg/mol)
Mn,PEO§ (kg/mol)PDI§Dimensions of MAPbBr3/SiO2 core/shell
NCs (core diameter/shell thickness) (nm)
Sample A800014,60050001.156.1 ± 0.3/8.9 ± 0.4
Sample B930021,60050001.188.0 ± 0.3/9.8 ± 0.4
Sample C850013,8005,0001.196.8 ± 0.3/8.0 ± 0.3
Sample D780015,60010,0001.196.0 ± 0.4/8.9 ± 0.5

*Number average MW of the inner P4VP block (Mn,P4VP) was calculated from 1H NMR data. The calculation method was adapted from a previous work (33).

†Number average MW, Mn of each PtBA block calculated on the basis of 1H NMR data from the MW difference between PtBA block and P4VP block. The intermediate PtBA block can be calculated by the following equation Mn,PtBA = Aa/9Ab/4 × Mn,P4VP × MtBAM4VP, where Mn,P4VP and M4VP are MWs of the inner P4VP block and the 4VP monomer, respectively. Ab and Aa are the integral area of the protons in the pyridine group of P4VP block and the integral area of methyl protons in the tert-butyl group of PtBA block, respectively. Mn,PtBA and Mn,P4VP are MWs of the intermediate PtBA block and the inner P4VP block, respectively. Ae and Ab are the integral area of methyl protons in the tert-butyl group of PtBA block and the integral area of protons in the pyridine group of P4VP block, respectively. MtBA and M4VP are MWs of the tBA monomer and the 4VP monomer, respectively.

‡Number average MW of the outer PS block was calculated from 1H NMR data based on the following equation Mn,PS = (9×AbAa × MPtBAMtBA  4 × MP4VPM4VP) × MSt5, where Mn,PS, Mn,PtBA, and Mn,P4VP are the MWs of the outer PS block, intermediate PtBA block, and inner P4VP block, respectively. Aa and Ab are the integral area of methyl protons in the tert-butyl group of PtBA block and the integral area of protons in the phenyl group and the pyridine group of PS and P4VP blocks, respectively. MSt, MtBA, and MP4VP are MWs of St, tBA, and 4VP monomers, respectively.

§PDI was recorded by DMF GPC.

The core diameter and shell thickness of core/shell NCs were determined by performing image analysis on TEM images of MAPbBr3/SiO2 core/shell NCs.