Sökning: id:"swepub:oai:DiVA.org:kth-147041" >
Reversible Modifica...
Reversible Modification of CdSe-CdS/ZnS Quantum Dot Fluorescence by Surrounding Ca2+ Ions
-
- Li, Li (författare)
- Gothenburg University,Göteborgs universitet,KTH,Cellens fysik,Science for Life Laboratory, SciLifeLab,Institutionen för medicin, avdelningen för molekylär och klinisk medicin,Institute of Medicine, Department of Molecular and Clinical Medicine
-
- Chen, Yun, 1966 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för molekylär och klinisk medicin,Institute of Medicine, Department of Molecular and Clinical Medicine
-
- Tian, Guangjun (författare)
- KTH,Teoretisk kemi och biologi
-
visa fler...
-
- Akpe, Victor (författare)
- KTH,Tillämpad fysik,Science for Life Laboratory, SciLifeLab
-
- Xu, Hao (författare)
- KTH,Cellens fysik,Science for Life Laboratory, SciLifeLab
-
Gan, Li-Ming (författare)
-
- Skrtic, Stanko, 1970 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för invärtesmedicin och klinisk nutrition,Institute of Medicine, Department of Internal Medicine and Clinical Nutrition
-
- Luo, Yi (författare)
- KTH,Teoretisk kemi och biologi
-
- Brismar, Hjalmar (författare)
- Karolinska Institutet,KTH,Cellens fysik,Science for Life Laboratory, SciLifeLab
-
- Fu, Ying (författare)
- KTH,Cellens fysik,Science for Life Laboratory, SciLifeLab
-
visa färre...
-
(creator_code:org_t)
- 2014-05-02
- 2014
- Engelska.
-
Ingår i: The Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 118:19, s. 10424-10433
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
https://gup.ub.gu.se...
-
http://kipublication...
-
visa färre...
Abstract
Ämnesord
Stäng
- It has been known for a long time that the fluorescence intensity of colloidal quantum dots (QDs) becomes modified when free ions are added to the QD solution. The consequences of removing free ions from the QD solution, however, have not been closely investigated. In this work we studied fluorescence from 3-mercaptopropionic acid (3-MPA) coated CdSe-CdS/ZnS core-multishell QDs when free Ca2+ ions were added to and subsequently removed from the QD solution. It was found that QD fluorescence intensity was reduced when Ca2+ ions were added to the QD solution, while the wavelength of the QD fluorescence peak remained unchanged. QD fluorescence recovered when the concentration of free Ca2+ ions in the QD solution was reduced by adding Ca2+ chelator (ethylene glycol tetraacetic acid, EGTA). It was further observed that the time of single QD fluorescence at on-state and QD fluorescence lifetimes were also reduced after adding Ca2+ and then recovered when EGTA was added. Theoretical study shows that a free Ca2+ ion can attach stably to the system of [QD + surface ligand], attract the photoexcited electron, and repel the photoexcited hole inside the QD core, leading to the reduction of the radiative recombination between the electron and hole, thereafter decreasing the QD fluorescence intensity, on-state time, and fluorescence lifetimes, as observed experimentally. To the best of our knowledge, this is a first study to show that the changes of QD optical properties are reversible under the influence of Ca2+ ions. We further estimated the equilibrium association constant pK(a) of our QDs with Ca2+, which is much larger than QDs with Mg2+, Na+, and K+, indicating the feasibility of developing a QD-based Ca2+ sensor.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- PH Sensor
- Blinking
- Photoluminescence
- Indicators
- Mechanism
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Li, Li
-
Chen, Yun, 1966
-
Tian, Guangjun
-
Akpe, Victor
-
Xu, Hao
-
Gan, Li-Ming
-
visa fler...
-
Skrtic, Stanko, ...
-
Luo, Yi
-
Brismar, Hjalmar
-
Fu, Ying
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Kemi
-
och Fysikalisk kemi
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Kemi
- Artiklar i publikationen
-
The Journal of P ...
- Av lärosätet
-
Kungliga Tekniska Högskolan
-
Göteborgs universitet
-
Karolinska Institutet