Heli B, Morales-Narváez E, Golmohammadi H, Ajji A, Merkoçi A
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, Barcelona 08193, Spain and 3SPack, CREPEC, Département de génie chimique, Polytechnique Montréal, Montréal, Québec, Canada.
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, Barcelona 08193, Spain.
Nanoscale. 2016 Apr 21;8(15):7984-91. doi: 10.1039/c6nr00537c.
The localized surface plasmon resonance exhibited by noble metal nanoparticles can be sensitively tuned by varying their size and interparticle distances. We report that corrosive vapour (ammonia) exposure dramatically reduces the population density of silver nanoparticles (AgNPs) embedded within bacterial cellulose, leading to a larger distance between the remaining nanoparticles and a decrease in the UV-Vis absorbance associated with the AgNP plasmonic properties. We also found that the size distribution of AgNPs embedded in bacterial cellulose undergoes a reduction in the presence of volatile compounds released during food spoilage, modulating the studied nanoplasmonic properties. In fact, such a plasmonic nanopaper exhibits a change in colour from amber to light amber upon the explored corrosive vapour exposure and from amber to a grey or taupe colour upon fish or meat spoilage exposure. These phenomena are proposed as a simple visual detection of volatile compounds in a flexible, transparent, permeable and stable single-use nanoplasmonic membrane, which opens the way to innovative approaches and capabilities in gas sensing and smart packaging.
贵金属纳米粒子所表现出的局域表面等离子体共振可通过改变其尺寸和粒子间距离进行灵敏调节。我们报告称，暴露于腐蚀性蒸汽（氨气）中会显著降低细菌纤维素中嵌入的银纳米粒子（AgNP）的数量密度，导致剩余纳米粒子之间的距离增大，并使与AgNP等离子体特性相关的紫外 - 可见吸收降低。我们还发现，在食物变质过程中释放的挥发性化合物存在时，嵌入细菌纤维素中的AgNP的尺寸分布会减小，从而调节所研究的纳米等离子体特性。事实上，这种等离子体纳米纸在暴露于所探究的腐蚀性蒸汽时会从琥珀色变为浅琥珀色，在暴露于鱼肉变质时会从琥珀色变为灰色或灰褐色。这些现象被提议作为一种在柔性、透明、可渗透且稳定的一次性纳米等离子体膜中对挥发性化合物进行简单视觉检测的方法，这为气体传感和智能包装中的创新方法和能力开辟了道路。
