MAPbBr3/SiO2 core/shell NCs were synthesized by in situ transformation of PbBr2 into MAPbBr3 in the presence of MABr, followed by hydrolysis of TMOS in the space occupied by PAA chains. In the typical synthesis of core/shell NCs, PAA-b-PEO–capped PbBr2 NCs were dissolved in a 20-ml mixture solution containing toluene and chloroform (the volume ratio of toluene/chloroform was 1:1) under argon protection. MABr (0.16 M) isopropanol solution was added dropwise into the solution noted above under vigorous stirring via a syringe pump for 1 hour. The solution was continuously stirred at 40°C for another 2 hours before the excess MABr was removed by centrifugation. Subsequently, 0.1 ml of TMOS was added into the supernatant under vigorous stirring, followed by purification using toluene as a solvent and hexane as a precipitator for three times. The purified MAPbBr3/SiO2 core/shell NCs were redissolved in toluene and remained stable for several weeks. Synthesis of PS-capped MAPbBr3/SiO2 core/shell NCs followed the same procedure as that of PEO-capped MAPbBr3/SiO2 core/shell NCs, except star-like P4VP-b-PtBA-b-PS was used as nanoreactor.

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