论文标题
在聚合物基质中通过脉冲激光消融在液体中的聚合物基质中的原位合成
In situ synthesis of polyynes in a polymer matrix by pulsed laser ablation in liquid
论文作者
论文摘要
Polyynes是由具有交替的单键和三键的Sp杂交碳原子形成的有限链，并显示出有趣的电子和光学性能。液体（PLAL）中的脉冲激光消融是一种评估的技术，用于溶液中氢限制的Polyynes的物理合成，但是，它们的有限稳定性阻止了对不同应用的材料的进一步利用。在这项工作中，通过直接在PVA水溶液中烧蚀石墨，在单步质量过程中产生了聚乙烯（乙烯基醇）（PVA）中的Polyynes，研究了聚合物浓度的作用。 PVA溶液作为pLAL的参与介质的存在被证明有利于Polyynes的形成。在液体样品和自由固定的纳米复合材料上进行的AG胶体添加在液体样品和独立的纳米复合材料上，在溶剂蒸发后获得。我们表明，纳米复合材料中的Polyynes至少保持稳定，至少保持11个月，而相应的PVA/AG/Polyynes溶液在3周后显示出强大的Polyyne还原。这些结果为进一步表征了基于多扬的膜和材料的特性提供了进一步表征的观点。
Polyynes are finite chains formed by sp-hybridized carbon atoms with alternating single and triple bonds and displaying intriguing electronic and optical properties. Pulsed laser ablation in liquid (PLAL) is a well assessed technique for the physical synthesis of hydrogen-capped polyynes in solution, however, their limited stability prevents further exploitation in materials for different applications. In this work, polyynes in poly(vinyl alcohol) (PVA) were produced in a single-step PLAL process by ablating graphite directly in aqueous solution of PVA, investigating the role of polymer concentration. The presence of PVA solution, as a participating medium for PLAL, is shown to favour the formation of polyynes. The addition of Ag colloids to the aqueous PVA/polyynes solution allowed surface-enhanced Raman spectroscopy (SERS) measurements, carried out both on liquid samples and on free-standing nanocomposites, obtained after solvent evaporation. We show that polyynes in the nanocomposite remain stable at least for 11 months, whereas the corresponding PVA/Ag/polyynes solution displayed a strong polyyne reduction already after 3 weeks. These results open the view to further characterizations of the properties of polyyne-based films and materials.
