Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Nano. 2020 May 26;14(5):6087-6096. doi: 10.1021/acsnano.0c01819. Epub 2020 May 8.
Noble metal nanostructures with plasmonic circular dichroism (PCD) have attracted interest, and a modulation of PCD is of great importance for their potential applications. Herein, we propose a supramolecular strategy for achieving dual thermal and photoswitchable PCD. When guanosine (G), deoxyguanosine (dG), and boric acid modified achiral gold nanorods (GNRs) were coassembled into a hydrogel, hybrid nanofibers with PCD were produced. When the hydrogel was heated, the nanofiber was disassembled and the PCD disappeared. As the hydrogel was thermally reversible, a thermo-controlled PCD could be realized. The hybrid hydrogel also showed photoswitchable PCD. When the gel was irradiated with an IR laser, the PCD disappeared. It can be restored by being placed at room temperature. Moreover, the hybrid gel was selectively responsive to the circularly polarized light (CPL). For (G/dG)-GNR hybrid assemblies, the R-CPL irradiation showed photothermal efficiency higher than that of L-CPL, which made it useful for an IR-irradiation-controlled release of drug molecules.
具有等离子体圆二色性（PCD）的贵金属纳米结构引起了人们的兴趣，而 PCD 的调制对于它们的潜在应用非常重要。在此，我们提出了一种超分子策略，以实现双重热和光可控 PCD。当鸟嘌呤（G）、脱氧鸟嘌呤（dG）和硼酸修饰的非手性金纳米棒（GNRs）共组装成水凝胶时，会产生具有 PCD 的混合纳米纤维。当水凝胶被加热时，纳米纤维被拆开，PCD 消失。由于水凝胶具有热可逆性，可以实现热控 PCD。混合水凝胶还表现出光可控 PCD。当凝胶用红外激光照射时，PCD 消失。它可以通过放置在室温下恢复。此外，混合凝胶对圆偏振光（CPL）具有选择性响应。对于（G/dG）-GNR 混合组装体，R-CPL 照射显示出比 L-CPL 更高的光热效率，这使其可用于受控释放药物分子的红外照射。
