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SUMMARY:Fluorescence spectroscopy of quantum dots in an optical tweezer
DTSTART;VALUE=DATE-TIME:20210726T133000Z
DTEND;VALUE=DATE-TIME:20210726T134500Z
DTSTAMP;VALUE=DATE-TIME:20260609T111438Z
UID:indico-contribution-7174@events.saip.org.za
DESCRIPTION:Speakers: Ané Kritzinger (Chemistry Department\, University o
 f Pretoria\, Pretoria\, South Africa)\nOptical tweezers have found countle
 ss applications in the fields of physics and biology ever since its advent
  in 1986 by Arthur Ashkin. Using only focused light\, optical tweezers are
  able to trap and manipulate microscopic particles. In this work\, we inve
 stigate the possibility of combining the optical tweezer with fluorescence
  spectroscopy to develop an ultra-sensitive analytical instrument. We spec
 ifically focus on the feasibility of quantum dot nanoparticles used in con
 junction with optical tweezers. In this work\, we report on the synthesis 
 of L-cysteine capped CdSe/ZnS quantum dots (QDs) and the coupling thereof 
 to commercial carboxyl-modified beads. The QD-tagged beads which are two 
 µm in diameter can be trapped with the optical tweezers and will be used 
 as the fluorescence probe. A setup of an optical tweezer with a 532 nm las
 er was employed with which trapping of particles was demonstrated. The det
 ection of fluorescence emission from the QDs that are covalently bonded to
  the beads was also demonstrated with the optical tweezer. This research\,
  therefore\, serves as a proof of concept for a sensitive analytical metho
 d that makes use of an optical tweezer in combination with fluorescent QDs
 .\n\nhttps://events.saip.org.za/event/206/contributions/7174/
LOCATION:North-West University Potchefstroom Campus
URL:https://events.saip.org.za/event/206/contributions/7174/
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