Ever wonder how sometimes people still get through security with explosives on their person? Research done in the University of Alberta’s Department of Chemical and Materials Engineering has revealed a new way to better detect these molecules.
A team of researchers including post-doctoral fellows: Seonghwan Kim, Dongkyu Lee, and Xuchen Liu, with Research Associate, Charles Van Neste, visiting Professor, Sangmin Jeon from the Pohang University of Science and Technology (South Korea), and Professor Thomas Thundat, has found a method of using receptor-free nanomechanical infrared spectroscopy to increase recognition of chemical molecules in explosive mixtures.
Detecting trace amounts of explosives with mixed molecules presents a formidable challenge for sensors with chemical coatings. The nanomechanical infrared spectroscopy used by the research team provides higher selectivity in molecular detection by measuring the photothermal effect of the absorbed molecules.
Dr. Thundat, Professor in the Department of Chemical and Materials Engineering and Canadian Excellence Research Chair in Oil Sands Molecular Engineering, explained that the spectroscopy looks at the physical nature of the molecule and said, “even if there are mixed molecules, we can detect specific molecules using this method.”
Dr. Seonghwan (Sam) Kim explained that conventional sensors based on coatings generally cannot detect specific molecules in complex mixtures if the concentration of interfering molecules is five times greater than the target molecules. The detection sensitivity and selectivity are drastically increased using the high power infrared laser because the photothermal signal comes from the absorption of infrared photons and nonradiative decay processes. Using this method, a few trillionths of a gram of explosive molecules can now be detected in a complex mixture even if there is a concentration of other interfering molecules is high.
The research team compiled their results into a paper titled “Molecular recognition using receptor-free nanomechanical infrared spectroscopy based on a quantum cascade laser,” which was published in Scientific Reports by Nature Publishing Group on January 23, 2013.
On discovering the results, Dr. Kim said, “It was exciting and now we have even more results so I look forward to more opportunities to publish them in the future.”
The research team’s current work looks at detecting biomolecules and hydrocarbons in the oil industry and nerve gas stimulants (DMMP), which can be found in household radiators, gasoline, and fabric softeners, for example. The team also hopes to develop a handheld device for chemical detection that could be utilized in fields such as security, healthcare and environmental protection.
The full article as published in Nature Scientific Reports can be found online here.
Dr. Thomas Thundat
Professor in Chemical & Materials Engineering, and
Canada Excellence Research Chair in Oil Sands Molecular Engineering