Supporting Information
Facile Preparation of Highly Blue Fluorescent Metal Nanoclusters without Phase Transfer Agent in Organic Media Xin Huang,† Buyi Li,† Luo Li,† Hui Zhang,† Irfan Majeed,† Irshad Hussain‡* and Bien Tan†* †
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology,
Wuhan 430074 (P.R. China), ‡Department of Chemistry, LUMS School of Science & Engineering (SSE), D.H.A., Lahore Cantt-54798, Pakistan. Contents: SI-1: The Characterization of Thioether Polymer Ligands. SI-2: The Characterization of AuNCs@PTMP-PVAc, AgNCs@PTMP-PVAc and PtNCs@PTMP-PVAc. SI-3
References and Notes.
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SI-1: The Characterization of Thioether Polymer Ligands. Gel Permeation Chromatography. GPC was performed with an Agilent 1100 instrument using refractive index detector (RID) in order to obtain the molecular weights of polymer ligands. THF was used as the eluent at a flow rate of 1.0 mL/min at 23 ℃. The calculated molecular weights were based on a calibration curve for polystyrene standards of narrow polydispersity (Polymer Laboratories).
Figure S1. GPC elution curves of polymer ligands PTMP-PVAc with different molecular weights.
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1
H NMR Spectroscopy.
1
H NMR spectra were recorded in CDCl3 on a Bruker AV400 MHz
spectrometer at room temperature using the δ scale and tetramethylsilane (TMS) as an internal standard. The 1H NMR spectra were similar to our previous works.1 PTMP-PVAc (CDCl3) δ (ppm): 1.45-1.61 SH, 1.74-1.77 CH2, 1.94-2.08 CH3, 2.61-2.70 CH2 (from PTMP), 2.72-2.83 CH2 (from PTMP), 4.17-4.27 CH2 (from PTMP), 4.86 CH.
Figure S2. 1H NMR of thioether polymer ligands PTMP-PAVc, AuNCs@PTMP-PAVc, AgNCs@PTMP-PAVc and PtNCs@PTMP-PAVc.
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Infrared spectroscopy (IR): IR spectroscopy of metal NCs were acquired by the VERTEX 70 FTIR & Raman Spectrophotometer (Bruker, Ger.). The viscous specimen was dispersed in appropriate solvent and the solution was carefully poured between two KBr plates. The powder solid samples were also prepared by mixing the samples with some pure KBr and then pressed into transparent films for further characterization.
Figure S3. FTIR spectra of thioether polymer ligands PTMP-PAVc, AuNCs@PTMP-PAVc, AgNCs@PTMP-PAVc and PtNCs@PTMP-PAVc.
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Fluorescence Spectroscopy: The fluorescence of samples was determined by a FP-6500 fluorescence spectrometer (Jasco, JPN) at room temperature using the quartz cuvette cells. The emission spectra were obtained with different excited wavelength and the excitation spectra were measured at the corresponding maximum emission wavelength.
Fig. S4. The fluorescence excitation spectra of thioether polymer ligand PTMP-PVAc and the
fluorescence emission spectra of PTMP-PVAc, solvent THF and the chain transfer agent PTMP.
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SI-2. The
Characterization
of
AuNCs@PTMP-PVAc,
AgNCs@PTMP-PVAc
and
PtNCs@PTMP-PVAc. Thermogravimetric Analysis:
TGA was performed on a Pyris1 TGA purchased from
PerkinElmer Instruments. The AuNCs prepared using thioether polymer ligands heated from 30 to 700 ºC at a rate of 10 ºC/min under the nitrogen and oxygen atmosphere in the TGA pan. It was easily obtained the content of various components in the sample from the curves (weight loss vs temperature). The measured values of AuNCs contents were consistent with the theoretical values.
Figure S5. Weight loss versus temperature curves of AuNCs@PTMP-PAVc, AgNCs@PTMP-PAVc and Pt NCs@PTMP-PAVc.
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Dynamic Light Scattering (DLS):
The hydrodynamic size of Metal NPs was obtained by a high-
performance particle sizer (Zetasizer Nano S) with DLS and NIBSTM (Non-invasive Back Scatter) technology from Malvern Instruments (Malvern, UK) with effective detection capability from 0.6 to 6000 nm.
Figure S6. DLS spectra of AuNCs stabilized by different Mn of polymer ligands PTMP-PVAc in THF solution.
Figure S7. DLS spectra of AuNCs stabilized with polymer ligands PTMP-PVAc in THF at different concentrations.
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Figure S8. DLS spectra of AgNCs stabilized with polymer ligands PTMP-PVAc in THF at different concentrations.
Figure S9. DLS spectra of PtNCs stabilized with polymer ligands PTMP-PVAc in THF at different concentrations.
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UV-Visible Absorption Spectra: The UV-Visible is absorption spectra of AgNCs and PtNCs prepared at different conditions.
Figure S10. UV spectrum of AgNCs stabilized with polymer ligands PTMP-PVAc in THF at different concentrations.
Figure S11. UV spectrum of PtNCs stabilized with polymer ligands PTMP-PVAc in THF at different concentrations.
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SI-3: References and Notes. 1.
Huang, X.; Li, B.; Zhang, H.; Hussain, I.; Liang, L.; Tan, B. Nanoscale 2011 3, 1600-1607.
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