Photonic gas sensors exploiting directly the optical properties of hybrid carbon nanotube localized surface plasmon structures

Weinvestigate the modification of the optical properties of carbon nanotubes(CNTs)resulting from a chemical reaction triggered by the presence of a specific compound(gaseous carbon dioxide(CO_(2)))and show this mechanism has important consequences for chemical sensing.CNTs have attracted significant research interest because they can be functionalized for a particular chemical,yielding a specific physical response which suggests many potential applications in the fields of nanotechnology and sensing.So far,however,utilizing their optical properties for this purpose has proven to be challenging.We demonstrate the use of localized surface plasmons generated on a nanostructured thin film,resembling a large array of nano-wires,to detect changes in the optical properties of the CNTs.Chemical selectivity is demonstrated using CO_(2) in gaseous form at room temperature.The demonstrated methodology results additionally in a new,electrically passive,optical sensing configuration that opens up the possibilities of using CNTs as sensors in hazardous/explosive environments.

为规范处方行为开个处方——一些医学生并不具备熟练开处方的能力

每年的这个时候，新分配来的医生上岗了，老的担心又出现了——他们受过良好的培训了吗？特别令人担忧的是：他们在临床药物治疗和开处方方面是否受过合格的培训？我们认为培训未必合格。