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Shape-dependent thermo-plasmonic effect of nanoporous gold at the nanoscale for ultrasensitive heat-mediated remote actuation†
Nanoscale ( IF 5.8 ) Pub Date : 2018-08-08 00:00:00 , DOI: 10.1039/c8nr04053b
Zhe Yang 1, 2, 3, 4 , Xuemei Han 1, 2, 3, 4 , Hiang Kwee Lee 1, 2, 3, 4, 5 , Gia Chuong Phan-Quang 1, 2, 3, 4 , Charlynn Sher Lin Koh 1, 2, 3, 4 , Chee Leng Lay 1, 2, 3, 4, 5 , Yih Hong Lee 1, 2, 3, 4 , Yue-E Miao 6, 7, 8, 9, 10 , Tianxi Liu 6, 7, 8, 9, 10 , In Yee Phang 5, 11, 12, 13 , Xing Yi Ling 1, 2, 3, 4
Affiliation  

Nanoporous gold (NPG) promises efficient light-to-heat transformation, yet suffers limited photothermal conversion efficiency owing to the difficulty in controlling its morphology for the direct modulation of thermo-plasmonic properties. Herein, we showcase a series of shape-controlled NPG nanoparticles with distinct bowl- (NPG-B), tube- (NPG-T) and plate-like (NPG-P) structures for quantitative temperature regulation up to 140 °C in <1 s using laser irradiation. Notably, NPG-B exhibits the highest photothermal efficiency of 68%, which is >12 and 39 percentage points better than those of other NPG shapes (NPG-T, 56%; NPG-P, 49%) and Au nanoparticles (29%), respectively. We attribute NPG-B's superior photothermal performance to its >13% enhanced light absorption cross-section compared to other Au nanostructures. We further realize an ultrasensitive heat-mediated light-to-mechanical “kill switch” by integrating NPG-B with a heat-responsive shape-memory polymer (SMP/NPG-B). This SMP/NPG-B hybrid is analogous to a photo-triggered mechanical arm, and can be activated swiftly in <4 s simply by remote laser irradiation. Achieving remotely-activated “kill switch” is critical in case of emergencies such as gas leaks, where physical access is usually prohibited or dangerous. Our work offers valuable insights into the structural design of NPG for optimal light-to-heat conversion, and creates opportunities to formulate next-generation smart materials for on-demand and multi-directional responsiveness.

中文翻译:

纳米级金在纳米尺度上的形状依赖性热等离子体效应,用于超灵敏热介导的远程驱动

纳米多孔金(NPG)有望实现有效的光热转换,但由于难以控制其形态来直接调节热等离激元性质,因此光热转换效率受到限制。在本文中,我们展示了一系列形状控制的NPG纳米颗粒,它们具有独特的碗形(NPG-B),管形(NPG-T)和板状(NPG-P)结构,可在<使用激光照射1 s。值得注意的是,NPG-B的光热效率最高,达到68%,比其他NPG形状(NPG-T,56%; NPG-P,49%)和金纳米颗粒(29%)高出12个百分点和39个百分点。 ), 分别。我们将NPG-B的出色光热性能归因于其与其他金纳米结构相比具有> 13%的增强的光吸收截面。通过将NPG-B与热响应形状记忆聚合物(SMP / NPG-B)集成在一起,我们进一步实现了超灵敏的热介导的光机械“杀伤开关”。这种SMP / NPG-B混合动力车类似于光触发机械臂,只需通过远程激光照射即可在<4 s内迅速激活。在紧急情况下,例如气体泄漏,通常禁止物理访问或危险操作,因此实现远程激活的“ kill switch”至关重要。我们的工作为NPG的结构设计提供了宝贵的见解,以实现最佳的光热转换,并为制定下一代智能材料提供了机会,以实现按需和多方向响应。这种SMP / NPG-B混合动力车类似于光触发机械臂,只需通过远程激光照射即可在<4 s内迅速激活。在紧急情况下,例如气体泄漏,通常禁止物理访问或危险操作,因此实现远程激活的“ kill switch”至关重要。我们的工作为NPG的结构设计提供了宝贵的见解,以实现最佳的光热转换,并为制定下一代智能材料提供了机会,以实现按需和多方向响应。这种SMP / NPG-B混合动力车类似于光触发机械臂,只需通过远程激光照射即可在<4 s内迅速激活。在紧急情况下,例如气体泄漏,通常禁止物理访问或危险操作,因此实现远程激活的“ kill switch”至关重要。我们的工作为NPG的结构设计提供了宝贵的见解,以实现最佳的光热转换,并为制定下一代智能材料提供了机会,以实现按需和多方向响应。
更新日期:2018-08-08
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