Optofluidic ring resonator sensors for rapid DNT vapor detection.
We demonstrated rapid 2,4-dinitrotoluene (DNT) vapor detection at room temperature based on an optofluidic ring resonator (OFRR) sensor. With the unique on-column separation and detection features of OFRR vapor sensors, DNT can be identified from other interferences coexisting in the analyte sample mixture, which is especially useful in the detection of explosives from practical complicated vapor samples usually containing more volatile analytes. The DNT detection limit is approximately 200 pg, which corresponds to a solid phase microextraction (SPME) sampling time of only 1 second at room temperature from equilibrium headspace. A theoretical analysis was also performed to account for the experimental results. Our study shows that the OFRR vapor sensor is a promising platform for the development of a rapid, low-cost, and portable analytical device for explosive detection and monitoring.
Sun
Yuze
Y
Department of Biological Engineering, 240D Bond Life Sciences Center, University of Missouri, 1201 E. Rollins Street, Columbia, Missouri 65211, USA.
Liu
Jing
J
Frye-Mason
Greg
G
Ja
Shiou-jyh
SJ
Thompson
Aaron K
AK
Fan
Xudong
X
D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D004136:Dinitrobenzenes / Q000032:analysis / Q000737:chemistry*; D057230:Limit of Detection; D008956:Models, Chemical; D010755:Organophosphates / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D015203:Reproducibility of Results; D013696:Temperature; D013997:Time Factors; D014835:Volatilization
D004136:Dinitrobenzenes; D010755:Organophosphates; D011092:Polyethylene Glycols; C016403:2,4-dinitrotoluene; C009549:triethyl phosphate