Güell-Grau Pau, Escudero Pedro, Perdikos Filippos Giannis, López-Barbera José Francisco, Pascual-Izarra Carlos, Villa Rosa, Nogués Josep, Sepúlveda Borja, Alvarez Mar
Instituto de Microelectrónica de Barcelona (IMB-CNM, CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
ACS Appl Mater Interfaces. 2021 Oct 13;13(40):47871-47881. doi: 10.1021/acsami.1c11710. Epub 2021 Oct 1.
New multi-stimuli responsive materials are required in smart systems applications to overcome current limitations in remote actuation and to achieve versatile operation in inaccessible environments. The incorporation of detection mechanisms to quantify in real time the response to external stimuli is crucial for the development of automated systems. Here, we present the first wireless opto-magnetic actuator with mechanochromic response. The device, based on a nanostructured-iron (Fe) layer transferred onto suspended elastomer structures with a periodically corrugated backside, can be actuated both optically (in a broadband spectral range) and magnetically. The combined opto-magnetic stimulus can accurately modulate the mechanical response (strength and direction) of the device. The structural coloration generated at the corrugated back surface enables to easily map and quantify, in 2D, the mechanical deflections by analyzing in real time the hue changes of images taken using a conventional RGB smartphone camera, with a precision of 0.05°. We demonstrate the independent and synergetic optical and magnetic actuation and detection with a detection limit of 1.8 mW·cm and 0.34 mT, respectively. The simple operation, versatility, and cost-effectiveness of the wireless multiactuated device with highly sensitive mechanochromic mapping paves the way to a new generation of wirelessly controlled smart systems.
智能系统应用中需要新型多刺激响应材料，以克服当前远程驱动方面的限制，并在难以接近的环境中实现多功能操作。纳入检测机制以实时量化对外部刺激的响应对于自动化系统的开发至关重要。在此，我们展示了首个具有机械变色响应的无线光磁致动器。该器件基于转移到具有周期性波纹背面的悬浮弹性体结构上的纳米结构化铁（Fe）层，可通过光学方式（在宽带光谱范围内）和磁性方式进行驱动。光磁联合刺激能够精确调节器件的机械响应（强度和方向）。在波纹后表面产生的结构色能够通过使用传统RGB智能手机摄像头实时分析拍摄图像的色调变化，以二维方式轻松绘制和量化机械挠度，精度可达0.05°。我们分别以1.8 mW·cm和0.34 mT的检测限展示了独立和协同的光驱动与磁驱动及检测。具有高灵敏度机械变色映射的无线多驱动器件的简单操作、多功能性和成本效益为新一代无线控制智能系统铺平了道路。
