| 摘要 |
Sensing techniques based upon evanescent-wave cavity ring-down spectroscopy (CRDS), with particular reference to functionalising a sensing surface with the aim of increasing specificity and/or sensitivity, invovle refreshing an interface to which is attached a material which has a selective response to a target, the method comprising: providing said interface with a photoelectron generator; and illuminating said photoelectron generator to release electrons to refresh said interface. The sensor includes an interface to which is attached a material which has a selective response to a target, wherein said interface is an optical interface, such that an evanescent wave at said interface is modified by said target, and wherein said interface is further provided with a photoelectron generator to assist in refreshing said interface. The photoelectron generator comprises a photoactive material such as titania (titanium dioxide), particularly rutile, or alternatively titanium oxide, a biopolymer, conductive polymer or semiconducting polymer. |
