Development of a Portable Petroleum By-Products Chemical Sensor: Phase III and IV

Semiconductor quantum dots (QDs) are considered to have potential for chemical sensing application because of their high surface to volume ratio and unique size tunable properties like photoluminescence (PL). However, this study revealed for the first time that the optical sensing process of nanoparticle based material is complicated, involving a lot of issues like how to assemble QDs without losing their original properties, nanoparticle associated light/matter interaction change and interference of analyte absorption in the film, how to achieve desired sensitivity, selectivity and stability for sensors, etc. The authors carried out systematic research on these from CdSe synthesis, surface functionalization, construction of QDs into sensible host media, sensing studies. Many improvements have been made which required overcoming various obstacles and the development of novel approaches and methods. As a result, the authors have achieved the lowest detection limit for hydrocarbons, ~10 ppm xylenes, within QD based sensing technologies, a monotonic detection range which spans over three orders of magnitude in analyte concentrations, which is a prerequisite for any sensor in real world applications. The authors also achieved selectivity for BTX that differs by only one methyl group, which can be combined into QDs sensor array with different QD sizes and temperature gradient for realization of complete selectivity.


  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Figures; References; Tables;
  • Pagination: 39p

Subject/Index Terms

Filing Info

  • Accession Number: 01146829
  • Record Type: Publication
  • Report/Paper Numbers: NYS-DOT Project C-02-08
  • Contract Numbers: 55657-02-20; 55657-05-19
  • Created Date: Dec 22 2009 8:48AM