Researchers from Lawrence Livermore National Laboratory (LLNL) and the Swiss Federal Institute of Technology (ETH) in Zurich have developed a new method of using nanotubes to detect molecules¹ at extremely low concentrations enabling trace detection of biological threats, explosives and drugs. The joint² research team, led by LLNL Engineer Tiziana Bond and ETH Scientist Hyung Gyu Park, are using spaghetti-like, gold-hafnium-coated carbon nanotubes (CNT) to amplify³ the detection capabilities⁴ in surface-enhanced Raman spectroscopy (SERS).

 

SERS is a surface-sensitive technique that enhances the inelastic（无弹性的） scattering⁵ of photons by molecules adsorbed on rough metal surfaces or by nanostructures.

 

Bond and her collaborators are using metal-coated nanotubes bunched together like a jungle canopy⁶（天蓬，华盖） to amplify the signals of both the incident and Raman scattered⁷ light by exciting local electron plasmons（等离激元）.

 

Their real breakthrough, however, is discovering the use of an intermediate dielectric coating (hafnium) to block the quenching⁸ of the free electrons in the metal by the CNTs, allowing the nanotubes to function uninhibited. By preserving the electrons and enhancing the light through the use of nanotube jungles, the team is able to significantly increase the SERS' detection sensitivities in CNTs structures.

 

The hafnium coating enables the bunching of gold nanotubes that creates a thick canopy full of sensitive spots for detection. The nanotubes enable incident light to be trapped and focused at the numerous contact points and crevices⁹, allowing the Raman-scattered light to pass through. This enables portable Raman devices to detect and identify specific airborne substances randomly¹⁰.

 

"This is a very important discovery in our efforts to improve the use of SERS devices," Bond said. "We gained this valuable knowledge through multidisciplinary basic research and approaching the problem with a rational design."

 

Bond and Park hope their engineered material will eventually be used in portable devices to conduct on-site analysis of chemical impurities¹¹ such as environmental pollutants¹² or pharmaceutical¹³ residues¹⁴ in water. Other applications include the real-time point-of-care monitoring of physiological¹⁵ levels for the biomedical industry and fast screening of drugs and toxins¹⁶ for law enforcement.

 

"We are in the process of filing a patent for our new discovery," Bond said.

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