Se precursor. concentration/m. CdO OA OLA HPA Se TOP CdO OA OLA HPA. Nucleation Temperature

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1 Morphologies Control of CdSe Nanoparticles via Two-step Segmented Microreactors Zhen-Hao Tian, a Meng Shao, a Xin-Yu Zhao, a Yu-Jun Wang, a Ke Wang, b Jian-Hong Xu* a a The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 84, China. b The State Key Laboratory of Industrial Vent Gas Reuse, the Southwest Research & Design Institute of the Chemical Industry, Chengdu 61225, China These authors contributed equally to this work. * Corresponding author: xujianhong@mail.tsinghua.edu.cn Table S1. The compositions of precursors in each experiment. Theme Group Initial Cd precursor concentration/m Se precursor concentration/m Additional Cd precursor concentration/m CdO OA OLA HPA Se TOP CdO OA OLA HPA Nucleation Temperature Crystal Seeds Concentration The Overall Ratio Monomer Concentration for Growth Stage Adding the same amount of ODE o C 21 o C Intensity (a.u.) Figure S1. The fluorescence spectra of CdSe nanoparticles synthesized at different nucleation temperatures. 1

2 Figure S2. TEM images of crystal seeds synthesized at different crystal seeds concentrations. (a) The ratio of Cd to Se for nucleation stage was 1/1. (b) The ratio of Cd to Se for nucleation stage was 1/1. (c) The ratio of Cd to Se for nucleation stage was 1/. The scale of (a) is 5 nm, and the scales of (b) and (c) are both 2 nm. 2

3 Figure S3. The EDS characterization of CdSe nanoparticles which was synthesized when the ratio of Cd to Se for nucleation stage was 1/ and the overall ratio of Cd to Se was 4/1. Table S2. The EDS characterization results. Elements Quality percentage Atomic percentage Cu Se Cd Total. 3

4 9 PL. Intensity For nucleation stage: Figure S4a. The fluorescence spectra of CdSe nanoparticles synthesized at different overall ratio of Cd to Se when the ratio of Cd to Se for nucleation stage was 1/1. PL.Intensity (u.a.) 45 For nucleation stage: Figure S4b. The fluorescence spectra of CdSe nanoparticles synthesized at different overall ratio of Cd to Se when the ratio of Cd to Se for nucleation stage was 1/1. 4

5 Intensity (u.a.) 9 8 For nucleation stage: Cd:Se=1: Figure S4c. The fluorescence spectra of CdSe nanoparticles synthesized at different overall ratio of Cd to Se when the ratio of Cd to Se for nucleation stage was 1/. PL.Intensity (u.a.) For nucleation stage: Fit Peak 1 Fit Peak Figure S5a. The multiple peak fit analysis for fluorescence spectrum of CdSe nanoparticles synthesized when the ratio of Cd to Se for nucleation stage was 1/1 and the overall ratio of Cd to Se was 2:1. PL.Intensity (u.a.) 6 For nucleation stage: Fit Peak 1 Fit Peak Figure S5b. The multiple peak fit analysis for fluorescence spectrum of CdSe nanoparticles synthesized when the ratio of Cd to Se for nucleation stage was 1/1 and the overall ratio of Cd to 5

6 Se was 3:1. PL.Intensity (u.a.) For nucleation stage: Fit Peak 1 Fit Peak Figure S5c. The multiple peak fit analysis for fluorescence spectrum of CdSe nanoparticles synthesized when the ratio of Cd to Se for nucleation stage was 1/1 and the overall ratio of Cd to Se was 4:1. Abs.Intensity For nucleation stage: Figure S6a. The UV-vis spectra of CdSe nanoparticles synthesized at different overall ratio of Cd to Se when the ratio of Cd to Se for nucleation stage was 1/1. 6

7 Abs.Intensity (u.a.) For nucleation stage: Figure S6b. The UV-vis spectra of CdSe nanoparticles synthesized at different overall ratio of Cd to Se when the ratio of Cd to Se for nucleation stage was 1/1. Abs.Intensity For nucleation stage: Cd:Se=1: Figure S6c. The UV-vis spectra of CdSe nanoparticles synthesized at different overall ratio of Cd to Se when the ratio of Cd to Se for nucleation stage was 1/. 7

8 (111) 25 For nucleation stage: Cd:Se=1: Intensity(a.u.) 15 (22) (311) θ Figure S7a. The XRD data of crystal seeds synthesized when the ratio of Cd to Se for nucleation stage was 1/. 7 6 (111) For nucleation stage: Intensity(a.u.) (22) (311) θ Figure S7b. The XRD data of crystal seeds synthesized when the ratio of Cd to Se for nucleation stage was 1/ (111) For nucleation stage: Intensity(a.u.) (22) (311) θ Figure S7c. The XRD data of crystal seeds synthesized when the ratio of Cd to Se for nucleation stage was 1/1. 8

9 (2) Intensity(a.u.) 8 6 (11) (13) (112) (12) θ Figure S7d. The XRD data of CdSe nanoparticles synthesized when the ratio of Cd to Se for nucleation stage was 1/1 and the overall ratio of Cd to Se was 4/1. Figure S8. TEM images of CdSe nanoparticles synthesized at a low Se precursor concentrations. 9