Ultrathin Colloidal PbS/CdS Core/Shell Nanosheets

Abstract

Emissive PbS/CdS core/shell nanosheets are synthesized using a cation-exchange method. A significant blue-shift of the photoluminescence is observed, indicating a stronger quantum confinement in the PbS core as its thickness is reduced to eight atomic layers. High resolution transmission-electron-microscopy images of the cross-sections of the core/shell nanosheets show atomically sharp interfaces between PbS and CdS. Accurate analysis of the thickness of each layer reveals the relationship between the energy-gap and the thickness in the extremely one-dimensionally confined nanostructure.

Boost the Lead Conversion Efficiency for the Synthesis of Colloidal 2D PbS Nanosheets

“…As one of the emerging colloidal 2D nanomaterials, lead sulfide (PbS) nanosheets [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] have demonstrated a thickness tunable bandgap, [5] a highly efficient multiple carrier generation, [18] a narrow emission linewidth, [19] large carrier mobilities, [20] and topological properties. [21] Scalable synthesis of nanomaterials with a high chemical yield is critical for their applications.…”