Fig. 2 | Nature Communications

Fig. 2

From: Sustainable scalable synthesis of sulfide nanocrystals at low cost with an ionic liquid sulfur precursor

Fig. 2

Characterization of the OLAHS ionic liquid precursor and its application in the synthesis of chalcogenides nanocrystals. a Background-subtracted attenuated total reflectance Fourier-transform infrared (ATR-FTIR) absorption spectrum of oleylamine (black), mesitylene (red), mesitylene after being bubbled with H2S (blue), OLAHS in mesitylene (purple), OLAHS in mesitylene (3-day old) (yellow), OLAHS in mesitylene after being kept at 120 °C for 10 min (green), and OLAHS in mesitylene after being kept under vacuum (10−3 Torr) at room temperature for 10 min (brown). ‘MSTL’, ‘RT’, and ‘vac’ is short for ‘mesitylene’, ‘room temperature’, and ‘vacuum’, respectively. b TEM image of the as-synthesized PbS nanocrystals using OLAHS (left) (scale bar: 20 nm) and the UV–Vis–NIR absorption spectra for samples collected at different growth times (right) using a fresh (black) and 3-day old (red) OLAHS precursor. Inset: comparison of sulfur yield of reaction using fresh or 3-day old OLAHS as precursor. The error bars depict the standard deviation from more than five samples collected from the same batch of reaction. c 1H NMR spectra of the amine protons. d TEM images of Cu2S, ZnS, CuInS2, Au@Ag2S (janus nanoparticles), and Bi2S3 nanocrystals synthesized using OLAHS as precursor (scale bar is 20 nm except for Bi2S3 nanorods (scale bar: 180 nm) and Bi2S3 nanowires (scale bar: 40 nm)). All the spectra have been offset for clarity

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