Miniature Chemical Sensor combining Molecular Recognition with Evanescent Wave Cavity Ring-Down Spectroscopy

Pipino, Andrew C. R. ; Meuse, Curtis W.

National Institute of Standards and Technology, Gaithersburg, MD (United States)

关键词: Optical Properties;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Sensitivity;    Adsorption;    54 Environmental Sciences;   

DOI  :  10.2172/839028
RP-ID  :  EMSP-73844--2004
RP-ID  :  AI07-97ER62518
RP-ID  :  839028

美国|英语

来源: UNT Digital Library

【 摘 要 】

To address the chemical sensing needs of DOE, a new class of chemical sensors is being developed that enables qualitative and quantitative, remote, real-time, optical diagnostics of chemical species in hazardous gas, liquid, and semi-solid phases by employing evanescent wave cavity ring-down spectroscopy (EW-CRDS). The feasibility and sensitivity of EW-CRDS was demonstrated previously under Project No.60231. The objective of this project is to enhance the selectivity and range of application of EW-CRDS. Selectivity is achieved spectroscopically by using vibrational overtones in the near infrared and chemically by using modified surfaces to encourage selective adsorption of analyte while preventing non-selective adsorption. The range of application is expanded by extending EW-CRDS to liquids and by combining EW-CRDS with the unique optical properties of nanoparticles.