Influence of Two Different Lead Sources on the Growth of PbSe Nanocrystals†

doi:10.7503/cjcu20140311

Abstract

Abstract:

Under different reaction temperature and reaction time, we studied the influence of PbO and Pb(Ac)₂ as lead sources on the growth of PbSe nanocrystals, respectively. Experimental results indicated that when we used PbO as a lead source, OA as the ligand, monodispersed spherical and truncated octahedral PbSe nanocrystals could be obtained at different reaction temperatures. In contrast, when we used Pb(Ac)₂ as the lead source, PbSe nanoflowers and nanostars could be obtained at different reaction temperatures. Different PbSe morphologies could be obtained when we chose different lead sources, which was attributed to different steric hindrance caused by different lengths of capping ligands. However, upon going through a high reaction temperature and a long reaction time, all these diverse morphologies of PbSe nanocrystals could evolve into cubic-like nanocrystals, which is determined by the crystal habit of PbSe.

Key words: PbO, Pb(Ac)2, PbSe nanocrystal, Morphology

CLC Number:

O611.4

TrendMD:

LI Xiaoteng, WANG Yingnan, LIN Aolei. Influence of Two Different Lead Sources on the Growth of PbSe Nanocrystals^†[J]. Chem. J. Chinese Universities, 2014, 35(9): 1871.

Figures/Tables 6

Fig.1 TEM images of the PbSe nanocrystals synthesized by PbO at different temperatures for 300 s (A) 60 ℃; (B) 90 ℃; (C) 150 ℃; (D) 180 ℃; (E) 240 ℃.

Fig.2 Near-infrared absorption spectra of PbSe nanocrystals synthesized by PbO at different temperatures(A—C) and comparison of the temporally evolved first excitonic absorption peaks of PbSe nanocrystals synthesized at different temperatures(D)(A) 80 ℃; (B) 150 ℃; (C) 180 ℃.

Fig.3 TEM images of PbSe nanocrystals synthesized by PbO at 240 ℃ for different time Time/s: (A) 60; (B) 120; (C) 360; (D) 600. Insets in Fig.3 are schematic diagrams of spherical(A), octahedral(B),quasi-cubic(C) and cubic(D) shaped PbSe nanocrystals.

Fig.4 TEM images(A—D) and corresponding high-magnification TEM images(E—H) of PbSe nanocrystals synthesized by Pb(Ac)2 at different temperatures for 300 s (A, E) 120 ℃; (B, F) 150 ℃; (C, G) 180 ℃; (D, H) 210 ℃.

Fig.5 TEM images of PbSe nanocrystals synthesized by Pb(Ac)2 at 180 ℃ for different reaction time Time/min: (A) 5; (B) 10; (C) 20; (D) 30.

Fig.6 XRD patterns of different PbSe nanocrystals a. PbSe nanostars; b. PbSe nanoparticles; c. PbSe nanoflowers.

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