J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (5): 703-710.DOI: 10.1016/j.jmst.2018.10.019
• Orginal Article • Next Articles
Lu Hana, Honghua Fangb, Chunmiao Dua, Jianxia Suna, Youyong Lia, Wanli Maa?()
Received:
2018-02-14
Accepted:
2018-05-21
Online:
2019-05-10
Published:
2019-02-20
Contact:
Ma Wanli
About author:
1 These authors contribute equally to this paper.
Lu Han, Honghua Fang, Chunmiao Du, Jianxia Sun, Youyong Li, Wanli Ma. Synthesis of ultra-narrow PbTe nanorods with extremely strong quantum confinement[J]. J. Mater. Sci. Technol., 2019, 35(5): 703-710.
Fig. 1 (a-c) TEM images of PbTe NCs synthesized with oleic acid (OA) trans-2-decenoic acid (t-2-DA) and trans-3-decenoic acid (t-3-DA), respectively; (d) Normalized optical absorption spectra of PbTe NCs with different lead precursors; (e) WAXS patterns of corresponding PbTe NCs.
Fig. 2 TEM images of PbTe NCs synthesized with (a) 1?M TDPTe in the mixture solution of TDP and ODE, (b) trace DPP in the mixture solution of TDP and ODE, (c) as well as the ODE solution without TDP; (d) Normalized absorption spectra of the three PbTe NCs synthesized from the mixture solution of TDP and ODE (black line), trace DPP in the mixture solution (blue line), and ODE only solution (orange line); (e) Plot for the amount of free TDP for two different telluride precursors during reaction: black line represents the mixture solution of TDP and ODE; blue line represents trace DPP in the mixture solution. Data was obtained from integration of 31P{1H} NMR peaks.
Fig. 3 (a-e) TEM images of PbTe NRs synthesized with the molar ratio of Pb:Te precursor of 20:3, 10:3, 10:9, 1:2 and 1:5, respectively; (f) Average diameter and length of the corresponding PbTe NRs synthesized with according Pb to Te precursor molar ratio; (g) Normalized absorption spectra of PbTe NRs synthesized with various Pb:Te molar ratios; (h) WAXS patterns of PbTe NRs synthesized with various Pb:Te molar ratios.
Fig. 4 (a-c) TEM and (d-f) HRTEM images of PbTe NRs synthesized at three different growth temperatures: 100?°C, 120?°C and 140?°C, respectively; (g-i) Diameter distribution histograms of corresponding PbTe NRs.
Fig. 5 (a) Normalized absorption spectra of PbTe NRs synthesized at 100?°C, 120?°C, 140?°C respectively; (b) Near infrared region and (c) visible region in PbTe NR absorption spectra; (d) Absorption (red solid curves) and PL (blue solid curves, excitation wavelength 400?nm) spectra for PbTe NRs synthesized at 120?°C.
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