Bayer Steevanson, Yin Yu Jason Ho, Nagl Stefan
Department of Chemistry, The Hong Kong University of Science and Technology Kowloon Hong Kong SAR China
Nanoscale Adv. 2024 May 13;6(13):3347-3354. doi: 10.1039/d4na00233d. eCollection 2024 Jun 25.
The synthesis of CsAgInBiCl nanocrystals was achieved at room temperature under ambient conditions using the ligand-assisted reprecipitation (LARP) method. The synthesized NCs exhibit bright orange emission when excited at 375 nm and have broad photoluminescence (PL) emission spectra with a maximum of 630 nm. A photoluminescence quantum yield (PLQY) of 36% was observed in these NCs without any polymer coatings. Polystyrene (PS), and poly (methyl methacrylate) (PMMA) were used to enhance the water stability and PLQY values up to 64%. Nanocomposite thin films with these polymer encapsulations exhibit good thermal stability up to at least 353 K and high quantum yields. PMMA-coated NCs showed long-term water stability for at least 4 months. The composites remain photostable when in contact with water for at least 120 min under continuous 365 nm UV illumination at 1 mW cm. Due to their excellent optical properties, aqueous stability, and wide range pH tolerance, these nanocomposite thin films could be employed for a variety of biological applications.
在室温环境条件下，采用配体辅助再沉淀（LARP）法实现了CsAgInBiCl纳米晶体的合成。合成的纳米晶体在375nm激发时呈现亮橙色发射，具有宽的光致发光（PL）发射光谱，最大值为630nm。在这些未进行任何聚合物包覆的纳米晶体中观察到光致发光量子产率（PLQY）为36%。使用聚苯乙烯（PS）和聚甲基丙烯酸甲酯（PMMA）可将水稳定性和PLQY值提高至64%。具有这些聚合物封装的纳米复合薄膜在至少353K的温度下表现出良好的热稳定性和高量子产率。PMMA包覆的纳米晶体显示出至少4个月的长期水稳定性。在1mW/cm的连续365nm紫外光照射下，复合材料与水接触至少120分钟时仍保持光稳定性。由于其优异的光学性能、水稳定性和宽范围的pH耐受性，这些纳米复合薄膜可用于多种生物应用。
