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Acid Dissociation o...
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Shambetova, NestanKTH,Tillämpad fysik
(author)
Acid Dissociation of 3-Mercaptopropionic Acid Coated CdSe-CdS/Cd0.5Zn0.5S/ZnS Core-Multishell Quantum Dot and Strong Ionic Interaction with Ca2+ Ion
- Article/chapterEnglish2016
Publisher, publication year, extent ...
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2016-02-09
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American Chemical Society (ACS),2016
Numbers
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LIBRIS-ID:oai:gup.ub.gu.se/233420
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https://gup.ub.gu.se/publication/233420URI
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https://doi.org/10.1021/acs.jpcc.5b11023DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191843URI
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http://kipublications.ki.se/Default.aspx?queryparsed=id:133050929URI
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20160912
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By devising careful electrophoresis, it was shown that at pH below 7.0, the electrophoretic mobility of 3-mercaptopropionic acid (3MPA) coated CdSe-ZnS core-shell quantum dots (denoted as QD-3MPA) was very small. At pH above 7.0, QD-3MPA migrated toward the anode, implying acid dissociation, and the degree of which was proportional to the pH value. QD-3MPA's electrophoretic mobility was impaired after adding sufficient Ca2+ ions to the QD solution and revived when a similar amount of Ca2+ chelators (ethylene glycol tetraacetic acid, EGTA) was added. This demonstrated that acid dissociation and its pH dependence of 3MPA on the QD surface are critical factors in understanding the electric and optical properties of QDs. The acid dissociated QD-3MPA interacted strongly with Ca2+, forming a charge neutral QD-3MPA Ca2+ complex in the absence of EGTA. First-principles study confirmed the observed experimental evidence. The strong ionic interaction between acid dissociated QD-3MPA and Ca2+ is critical for developing reliable QD-based biosensing assays. Moreover, the strategy and techniques reported in this work are easily applicable to other fluorescent biomarkers and therefore can be important for advancing in vivo and in vitro imaging, sensing, and labeling.
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Chen, Yun,1966Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för molekylär och klinisk medicin,Institute of Medicine, Department of Molecular and Clinical Medicine(Swepub:gu)xcheyu
(author)
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Xu, HaoKTH,Cellens fysik(Swepub:kth)u1ym6e8m
(author)
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Li, LiKTH,Tillämpad fysik(Swepub:kth)PI000004
(author)
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Solandt, JohanKTH,Tillämpad fysik(Swepub:kth)u1oh64af
(author)
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Zhou, Y. H.
(author)
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Wang, J. B.
(author)
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Su, H.
(author)
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Brismar, HjalmarKarolinska Institutet,KTH,Cellens fysik(Swepub:kth)u1232ew5
(author)
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Fu, YingKTH,Cellens fysik(Swepub:kth)u1wnf4xe
(author)
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KTHTillämpad fysik
(creator_code:org_t)
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In:Journal of Physical Chemistry C: American Chemical Society (ACS)120:6, s. 3519-35291932-74471932-7455
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Shambetova, Nest ...
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Chen, Yun, 1966
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Xu, Hao
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Li, Li
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Solandt, Johan
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Zhou, Y. H.
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Wang, J. B.
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Su, H.
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Brismar, Hjalmar
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Fu, Ying
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NATURAL SCIENCES
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University of Gothenburg
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Karolinska Institutet