Abstract The red water-soluble AgInS2 nanocrsytals (AIS NCs) were synthesized by one-step hydrothermal method. The effects of reaction time and molar ratio of precursors on the bandgap and fluorescence properties of AIS NCs were studied by UV–Vis absorption spectra, photoluminescence (PL) spectra. The experimental results indicated that the fluorescence peak of AIS NCs showed red-shift from 651 nm to 691 nm with the increase of reaction time. The full width at half maximum (FWHW) of AIS NCs obtained at 12 h was very narrow with 18.5 nm. When the reaction temperature and time were set to 200 °C and 12 h, the PL peaks of AIS NCs changed from 696 nm to 670 nm and 735 nm with the increase of indium concentration. In addition, the effect of In concentration on the optical band gap and PL peak was opposite. The optical bandgaps were 1.29 eV, 1.76 eV, and 1.51 eV, respectively. The photocatalytic H2 production performance was studied. The results indicated that the all AIS NCs obtained at different conditions showed high hydrogen production efficiency (>1000 μmol g−1•h−1). Finally, this method is very simple, safe, and easily controlled, and the position of fluorescence peak is adjustable, which shows that AIS NCs obtained in the paper have great application prospects.

中文翻译：

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具有高光催化制氢活性的水溶性红色AgInS2纳米晶体的一步合成

摘要 采用一步水热法合成了红色水溶性AgInS2纳米晶（AIS NCs）。通过UV-Vis吸收光谱、光致发光（PL）光谱研究了反应时间和前体摩尔比对AIS NCs带隙和荧光性质的影响。实验结果表明，随着反应时间的增加，AIS NCs的荧光峰从651 nm红移到691 nm。在 12 小时获得的 AIS NC 的半峰全宽 (FWHW) 非常窄，为 18.5 nm。当反应温度和时间设置为 200 °C 和 12 h 时，随着铟浓度的增加，AIS NCs 的 PL 峰从 696 nm 变为 670 nm 和 735 nm。此外，In浓度对光学带隙和PL峰的影响相反。光学带隙分别为 1.29 eV、1.76 eV、和 1.51 eV，分别。研究了光催化制氢性能。结果表明，在不同条件下获得的所有AIS NCs均表现出较高的制氢效率（>1000 μmol g-1•h-1）。最后，该方法非常简单、安全、易于控制，荧光峰位置可调，表明本文获得的AIS NCs具有很大的应用前景。