Hydrophobic Chain-Induced Conversion of 3D Cubic Perovskite Nanocrystals to Gold Nanocluster-Grafted 2D-Platelets for Photoinduced Electron Transfer Substrate Formulation

Mukherjee, Manish (2023) Hydrophobic Chain-Induced Conversion of 3D Cubic Perovskite Nanocrystals to Gold Nanocluster-Grafted 2D-Platelets for Photoinduced Electron Transfer Substrate Formulation. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS dissertation of Manish Mukherjee (18MS119)) Thesis_18MS119.pdf - Submitted Version Restricted to Repository staff only Download (2MB)

Abstract

Designing and fabricating nano-structured materials is one of the most important and interesting subjects for creating advanced functional devices, which has attracted much attention from a large community. Considering the new generation energy harvesting and electron-hole separation, herein we have converted the 3D cubic CsPbBr₃ perovskite nanocrystals into 2D nanosheet applying the concept of hydrophobic interaction. We have used various cationic surfactant coated AuNCs, transferred them into organic medium and applied to the oleic acid (OA) and oleyl amine (OAm) coated 3D perovskite nanocrystals to disintegrate the crystalline structure and reformation of 2D platelets grafted with the AuNCs. The derived 2D platelets act as electron donor and the AuNCs are the hot electron acceptors when triggered by photons and hence initiate a photoinduced electron transfer (PET) process over the 2D sheet. Temporal and spectral studies of the transients revealed the occurrence of PET between the two constituents of the nanosheets. We observed that the optimal chain length for a surfactant required for fastest exfoliation from the OA and OAm protected 3D cubic CsPbBr₃ perovskites is given by tetradecyltrimethylammonium bromide (TTAB) over cetyltrimethylammonium bromide (CTAB) and dodecyltrimethylammonium bromide (DTAB). We have shown that PET occurred fastest with the TTAB coated AuNCs, which is governed by the gaps between the energy levels of the participating candidates. Our findings further point out the significance of metal nanocluster-based hybrid 2D nanosheet system to be utilized in optoelectronic applications.

Actions (login required)

View Item