Lee Yi Seul, Bae Ji Young, Koo Hye Young, Lee Young Boo, Choi Won San
Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseodaero, Yuseong-gu, Daejeon 305-719, Republic of Korea.
Korea Institute of Science and Technology (KIST) Jeonbuk Institute of Advanced Composite Materials, 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeollabuk-do, Republic of Korea.
Sci Rep. 2016 Mar 4;6:22650. doi: 10.1038/srep22650.
We present the synthesis of polydopamine particle-gold composites (PdopP-Au) and unique release of Au@Pdop core@shell nanoparticles (NPs) from the PdopP-Au upon external stimuli. The PdopP-Au was prepared by controlled synthesis of AuNPs on the Pdop particles. Upon near infrared (NIR) irradiation or NaBH4 treatment on the PdopP-Au, the synthesized AuNPs within the PdopPs could be burst-released as a form of Au@Pdop NPs. The PdopP-Au composite showed outstanding photothermal conversion ability under NIR irradiation due to the ultrahigh loading of the AuNPs within the PdopPs, leading to a remote-controlled explosion of the PdopP-Au and rapid formation of numerous Au@Pdop NPs. The release of the Au@Pdop NPs could be instantly stopped or re-started by off or reboot of NIR, respectively. The structure of the released Au@Pdop NPs is suitable for a catalyst or adsorbent, thus we demonstrated that the PdopP-Au composite exhibited excellent and sustained performances for environmental remediation due to its capability of the continuous production of fresh catalysts or adsorbents during the reuse.
我们展示了聚多巴胺颗粒-金复合材料（PdopP-Au）的合成以及在外部刺激下从PdopP-Au中独特释放出Au@Pdop核壳纳米颗粒（NPs）的过程。PdopP-Au是通过在聚多巴胺颗粒上可控合成金纳米颗粒（AuNPs）制备而成。在对PdopP-Au进行近红外（NIR）照射或硼氢化钠（NaBH₄）处理时，聚多巴胺颗粒内合成的金纳米颗粒能够以Au@Pdop NPs的形式爆发式释放。由于聚多巴胺颗粒内金纳米颗粒的超高负载量，PdopP-Au复合材料在近红外照射下表现出出色的光热转换能力，导致PdopP-Au发生远程控制的爆炸，并快速形成大量的Au@Pdop NPs。Au@Pdop NPs的释放可以通过分别关闭或重启近红外照射立即停止或重新开始。释放出的Au@Pdop NPs的结构适合用作催化剂或吸附剂，因此我们证明，由于PdopP-Au复合材料在重复使用过程中能够持续产生新鲜的催化剂或吸附剂，它在环境修复方面表现出优异且持久的性能。
