Influence of the length and grafting density of PNIPAM chains on the colloidal and optical properties of quantum dot/PNIPAM assemblies

Oya Tagit; Nikodem Tomczak; Aliakbar Jafarpour; Dominik Jańczewski; Ming Yong Han; G. Julius Vancso; Jennifer L. Herek

doi:10.1088/0957-4484/22/26/265701

Influence of the length and grafting density of PNIPAM chains on the colloidal and optical properties of quantum dot/PNIPAM assemblies

Oya Tagit, Nikodem Tomczak, Aliakbar Jafarpour, Dominik Jańczewski, Ming Yong Han, G. Julius Vancso, Jennifer L. Herek

Research output: Contribution to journal › Article › Academic › peer-review

8 Citations (Scopus)

Abstract

Structural and optical characterization of water soluble, thermo-responsive quantum dot/poly(N-isopropyl acrylamide) (QD/PNIPAM) hybrid particles using fluorescence correlation spectroscopy (FCS) and time-correlated single photon counting (TCSPC) measurements performed at temperatures below and above the lower critical solution temperature (LCST) of PNIPAM is reported. By increasing the temperature above the LCST, the signature of the PNIPAM chain collapse covering the QDs is revealed by FCS measurements. Despite the significant structural change, the TCSPC measurements show that the fluorescence lifetimes remain of the same order of magnitude at T > LCST. Such QD/PNIPAM hybrid particles with water solubility and robust thermo-responsive behavior at physiologically relevant temperatures are potentially useful for (bio)molecular sensing and separation applications.

Original language	English
Article number	265701
Number of pages	6
Journal	Nanotechnology
Volume	22
Issue number	26
DOIs	https://doi.org/10.1088/0957-4484/22/26/265701
Publication status	Published - 2011

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title = "Influence of the length and grafting density of PNIPAM chains on the colloidal and optical properties of quantum dot/PNIPAM assemblies",

abstract = "Structural and optical characterization of water soluble, thermo-responsive quantum dot/poly(N-isopropyl acrylamide) (QD/PNIPAM) hybrid particles using fluorescence correlation spectroscopy (FCS) and time-correlated single photon counting (TCSPC) measurements performed at temperatures below and above the lower critical solution temperature (LCST) of PNIPAM is reported. By increasing the temperature above the LCST, the signature of the PNIPAM chain collapse covering the QDs is revealed by FCS measurements. Despite the significant structural change, the TCSPC measurements show that the fluorescence lifetimes remain of the same order of magnitude at T > LCST. Such QD/PNIPAM hybrid particles with water solubility and robust thermo-responsive behavior at physiologically relevant temperatures are potentially useful for (bio)molecular sensing and separation applications.",

author = "Oya Tagit and Nikodem Tomczak and Aliakbar Jafarpour and Dominik Ja{\'n}czewski and {Yong Han}, Ming and Vancso, {G. Julius} and Herek, {Jennifer L.}",

year = "2011",

doi = "10.1088/0957-4484/22/26/265701",

language = "English",

volume = "22",

journal = "Nanotechnology",

issn = "0957-4484",

publisher = "IOP Publishing Ltd.",

number = "26",

}

Influence of the length and grafting density of PNIPAM chains on the colloidal and optical properties of quantum dot/PNIPAM assemblies. / Tagit, Oya; Tomczak, Nikodem; Jafarpour, Aliakbar; Jańczewski, Dominik; Yong Han, Ming; Vancso, G. Julius ; Herek, Jennifer L.

In: Nanotechnology, Vol. 22, No. 26, 265701, 2011.

Research output: Contribution to journal › Article › Academic › peer-review

TY - JOUR

T1 - Influence of the length and grafting density of PNIPAM chains on the colloidal and optical properties of quantum dot/PNIPAM assemblies

AU - Tagit, Oya

AU - Tomczak, Nikodem

AU - Jafarpour, Aliakbar

AU - Jańczewski, Dominik

AU - Yong Han, Ming

AU - Vancso, G. Julius

AU - Herek, Jennifer L.

PY - 2011

Y1 - 2011

N2 - Structural and optical characterization of water soluble, thermo-responsive quantum dot/poly(N-isopropyl acrylamide) (QD/PNIPAM) hybrid particles using fluorescence correlation spectroscopy (FCS) and time-correlated single photon counting (TCSPC) measurements performed at temperatures below and above the lower critical solution temperature (LCST) of PNIPAM is reported. By increasing the temperature above the LCST, the signature of the PNIPAM chain collapse covering the QDs is revealed by FCS measurements. Despite the significant structural change, the TCSPC measurements show that the fluorescence lifetimes remain of the same order of magnitude at T > LCST. Such QD/PNIPAM hybrid particles with water solubility and robust thermo-responsive behavior at physiologically relevant temperatures are potentially useful for (bio)molecular sensing and separation applications.

AB - Structural and optical characterization of water soluble, thermo-responsive quantum dot/poly(N-isopropyl acrylamide) (QD/PNIPAM) hybrid particles using fluorescence correlation spectroscopy (FCS) and time-correlated single photon counting (TCSPC) measurements performed at temperatures below and above the lower critical solution temperature (LCST) of PNIPAM is reported. By increasing the temperature above the LCST, the signature of the PNIPAM chain collapse covering the QDs is revealed by FCS measurements. Despite the significant structural change, the TCSPC measurements show that the fluorescence lifetimes remain of the same order of magnitude at T > LCST. Such QD/PNIPAM hybrid particles with water solubility and robust thermo-responsive behavior at physiologically relevant temperatures are potentially useful for (bio)molecular sensing and separation applications.

U2 - 10.1088/0957-4484/22/26/265701

DO - 10.1088/0957-4484/22/26/265701

M3 - Article

VL - 22

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 26

M1 - 265701

ER -

Influence of the length and grafting density of PNIPAM chains on the colloidal and optical properties of quantum dot/PNIPAM assemblies

Abstract

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