Group of Biomaterials, Department of Polymeric Nanomaterials and Biomaterials, Institute of Polymer Science and Technology, ICTP-CSIC, Madrid, Spain.
Group of Nanohybrids and Interactive Polymers, Institute of Polymer Science and Technology, ICTP-CSIC, Madrid, Spain.
Carbohydr Polym. 2020 Dec 15;250:116973. doi: 10.1016/j.carbpol.2020.116973. Epub 2020 Aug 24.
The aim of this paper is to achieve in situ photochemical synthesis of silver nanoclusters (AgNCs) stabilized by the multiple-amine groups of chitosan (Ch@AgNCs) with luminescent and photothermal properties. Ch@AgNCs were obtained by applying a fast and simple methodology previously described by our group. Direct functionalization of AgNCs with chitosan template provided new nanohybrids directly in water solution, both in the presence or absence of oxygen. The formation of hybrid AgNCs could be monitored by the rapid increase of the absorption and emission maximum band with light irradiation time. New Ch@AgNCs not only present photoluminescent properties but also photothermal properties when irradiated with near infrared light (NIR), transducing efficiently NIR into heat and increasing the temperature of the medium up to 23 °C. The chitosan polymeric shell associated to AgNCs works as a protective support stabilizing the metal cores, facilitating the storage of nanohybrids and preserving luminescent, photothermal and bactericide properties.
本文旨在通过壳聚糖（Ch@AgNCs）的多胺基团原位光化学合成具有发光和光热性能的银纳米簇（AgNCs）。Ch@AgNCs 是通过我们小组之前描述的一种快速简便的方法获得的。AgNCs 与壳聚糖模板的直接功能化在有氧或无氧的情况下直接在水溶液中提供了新的纳米杂化物。通过光照射时间的快速增加，可以监测到混合 AgNCs 的形成，从而导致吸收和发射最大值带的快速增加。新的 Ch@AgNCs 不仅具有光致发光特性，而且在近红外光（NIR）照射下还具有光热特性，将 NIR 有效地转化为热量，将介质温度升高至 23°C。与 AgNCs 相关的壳聚糖聚合物壳作为稳定金属核的保护支撑，有利于纳米杂化物的储存，并保持发光、光热和杀菌性能。
