魔術尺寸硒化鎘奈米團簇物及二維結構之合成、鑑定與應用

Abstract

本研究探討低維度下奈米團簇物及二維結構硒化鎘之合成、結構及應用。在室溫下合成魔術尺寸的 (CdSe)13奈米團簇物，經由油胺進行剝離後，並以Ｘ光小角散射技術分析其形貌及大小，再藉由理論計算推測最穩定之構型加以佐證。在相同的合成條件下，進一步改變配位基（乙二胺、己二胺），可合成出具有高結晶性之二維結構硒化鎘，並在紫外光下可催化水分解產氫。透過穿透式電子顯微鏡、掃描式電子顯微鏡、原子力顯微鏡、紫外-可見光光譜儀、X光粉末繞射儀、X光吸收光譜、固態核磁共振儀、小角度X光散射等儀器之鑑定，理解魔術尺寸奈米團簇物與二維結構硒化鎘形貌結構、光學性質、晶相結構、化學環境、原子位置等重要特性。

Here we introduce syntheses, structures and applications of low-dimensional CdSe hybrid materials, including magic-size nanoclusters and 2D nanosheets. As-made (CdSe)13 nanoclusters were exfoliated in oleylamine solution in which their morphology and sizes were rationally determined by small-angle X-ray scattering, suggesting few isomeric structures of having diverse electronic transitions revealed in DFT calculations. In similar synthetic conditions, 2D CdSe nanosheets were recrystallized in the presence of 1,2-ethylenediamine and 1,6-hexanediamine, capable of catalyzing hydrogen evolution via water splitting. Characteristic morphologies, optical properties, crystal structures, chemical environments, atomic positions in low-dimensional CdSe hybrid materials were examined by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, UV-visible spectroscopy, X-ray powder diffraction, small-angle X-ray scattering, solid-state nuclear magnetic resonance, extended X-ray absorption fine structure technique.