Controlled synthesis of high-quality PbS star-shaped dendrites, multipods, truncated nanocubes, and nanocubes and their shape evolution process

Guangjun Zhou, Mengkai Lü, Zhiliang Xiu, Shufen Wang, Haiping Zhang, Yuanyuan Zhou, Shumei Wang

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174 Citations (Scopus)

Abstract

Well-defined single-crystalline PbS nano- and microstructures including dendrites, multipeds, truncated nanocubes, and nanocubes were synthesized in high yield by a simple solution route. Novel star-shaped PbS dendrites with six symmetric arms along the (100) direction, each of which shows one trunk (long axis) and four branches (short axes), have been achieved using Pb(AC) 2 and thioacetamide (TAA) as precursors, under the molar ratio Pb(AC)2/TAA = 2/1, at initial reaction temperature 80°C, refluxing for 30 min at 100°C, in the presence of cetyltrirnethylammonium bromine (CTAB). The "nanorods" in each branch are parallel to each other in the same plane and are perpendicular to the trunk. The truncated nanocubes mainly bounded by the {100} plane were prepared under a different Pb(AC)2/TAA molar ratio, at initial reaction temperature 40° C, refluxing for 12 h at 100°C. Based on the systematic studies on their shape evolution, a possible growth mechanism of these PbS nano- and microstructures was proposed. The shapes of PbS nanocrystals with facecentered cubic (fcc) structure are mainly determined by the ratio (R) between the growth rates along the (100) and (111) directions. The Pb(AC)2/TAA molar ratio and the initial reaction temperature influence the growth ratio R in the formation of PbS nuclei at an early stage, which results in the final morphology of PbS nanocrystals. Under the current experimental conditions, we can control the PbS shape evolution by simply tuning the molar ratio, the initial reaction temperature, and the period of reaction. Based on the systematic studies on the shape evolution, this approach is expected to be employed for the control-shaped synthesis of other fee structural semiconductor nanomaterials. The photoluminescence properties were investigated and the prepared nano- and microstructures displayed a very strong luminescence around 600-650 nm at room temperature.

Original languageEnglish
Pages (from-to)6543-6548
Number of pages6
JournalJournal of Physical Chemistry B
Volume110
Issue number13
DOIs
Publication statusPublished - 6 May 2006
Externally publishedYes

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