Temperature-modulated quenching of quantum dots covalently coupled to chain ends of poly(N-isopropyl acrylamide) brushes on gold

Oya Tagit; Nikodem Tomczak; Edmondo M Benetti; Yanina Cesa; Christian Blum; Vinod Subramaniam; Jennifer L Herek; G Julius Vancso

doi:10.1088/0957-4484/20/18/185501

Temperature-modulated quenching of quantum dots covalently coupled to chain ends of poly(N-isopropyl acrylamide) brushes on gold

Oya Tagit, Nikodem Tomczak, Edmondo M Benetti, Yanina Cesa, Christian Blum, Vinod Subramaniam, Jennifer L Herek, G Julius Vancso

Biophysics Photosynthesis/Energy

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

Abstract

A thermo-responsive polymer/quantum dot platform based on poly(N-isopropyl acrylamide) (PNIPAM) brushes 'grafted from' a gold substrate and quantum dots (QDs) covalently attached to the PNIPAM layer is presented. The PNIPAM brushes are grafted from the gold surface using an iniferter-initiated controlled radical polymerization. The PNIPAM chain ends are functionalized with amine groups for coupling to water-dispersible COOH-functionalized QDs. Upon increasing the temperature above the lower critical solution temperature (LCST) of PNIPAM the QD luminescence is quenched. The luminescence was observed to recover upon decreasing the temperature below the LCTS. The data obtained are consistent with temperature-modulated thickness changes of the PNIPAM layer and quenching of the QDs by the gold surface via nonradiative energy transfer.

Original language	English
Pages (from-to)	185501
Journal	Nanotechnology
Volume	20
Issue number	18
DOIs	https://doi.org/10.1088/0957-4484/20/18/185501
Publication status	Published - 6 May 2009

Keywords

Acrylic Resins
Crystallization
Gold
Luminescent Measurements
Macromolecular Substances
Materials Testing
Molecular Conformation
Nanotechnology
Particle Size
Quantum Dots
Surface Properties
Temperature
Journal Article
Research Support, Non-U.S. Gov't

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Temperature-modulated quenching of quantum dots covalently coupled to chain ends of poly(N-isopropyl acrylamide) brushes on gold",

abstract = "A thermo-responsive polymer/quantum dot platform based on poly(N-isopropyl acrylamide) (PNIPAM) brushes 'grafted from' a gold substrate and quantum dots (QDs) covalently attached to the PNIPAM layer is presented. The PNIPAM brushes are grafted from the gold surface using an iniferter-initiated controlled radical polymerization. The PNIPAM chain ends are functionalized with amine groups for coupling to water-dispersible COOH-functionalized QDs. Upon increasing the temperature above the lower critical solution temperature (LCST) of PNIPAM the QD luminescence is quenched. The luminescence was observed to recover upon decreasing the temperature below the LCTS. The data obtained are consistent with temperature-modulated thickness changes of the PNIPAM layer and quenching of the QDs by the gold surface via nonradiative energy transfer.",

keywords = "Acrylic Resins, Crystallization, Gold, Luminescent Measurements, Macromolecular Substances, Materials Testing, Molecular Conformation, Nanotechnology, Particle Size, Quantum Dots, Surface Properties, Temperature, Journal Article, Research Support, Non-U.S. Gov't",

author = "Oya Tagit and Nikodem Tomczak and Benetti, {Edmondo M} and Yanina Cesa and Christian Blum and Vinod Subramaniam and Herek, {Jennifer L} and {Julius Vancso}, G",

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T1 - Temperature-modulated quenching of quantum dots covalently coupled to chain ends of poly(N-isopropyl acrylamide) brushes on gold

AU - Tagit, Oya

AU - Tomczak, Nikodem

AU - Benetti, Edmondo M

AU - Cesa, Yanina

AU - Blum, Christian

AU - Subramaniam, Vinod

AU - Herek, Jennifer L

AU - Julius Vancso, G

PY - 2009/5/6

Y1 - 2009/5/6

N2 - A thermo-responsive polymer/quantum dot platform based on poly(N-isopropyl acrylamide) (PNIPAM) brushes 'grafted from' a gold substrate and quantum dots (QDs) covalently attached to the PNIPAM layer is presented. The PNIPAM brushes are grafted from the gold surface using an iniferter-initiated controlled radical polymerization. The PNIPAM chain ends are functionalized with amine groups for coupling to water-dispersible COOH-functionalized QDs. Upon increasing the temperature above the lower critical solution temperature (LCST) of PNIPAM the QD luminescence is quenched. The luminescence was observed to recover upon decreasing the temperature below the LCTS. The data obtained are consistent with temperature-modulated thickness changes of the PNIPAM layer and quenching of the QDs by the gold surface via nonradiative energy transfer.

AB - A thermo-responsive polymer/quantum dot platform based on poly(N-isopropyl acrylamide) (PNIPAM) brushes 'grafted from' a gold substrate and quantum dots (QDs) covalently attached to the PNIPAM layer is presented. The PNIPAM brushes are grafted from the gold surface using an iniferter-initiated controlled radical polymerization. The PNIPAM chain ends are functionalized with amine groups for coupling to water-dispersible COOH-functionalized QDs. Upon increasing the temperature above the lower critical solution temperature (LCST) of PNIPAM the QD luminescence is quenched. The luminescence was observed to recover upon decreasing the temperature below the LCTS. The data obtained are consistent with temperature-modulated thickness changes of the PNIPAM layer and quenching of the QDs by the gold surface via nonradiative energy transfer.

KW - Acrylic Resins

KW - Crystallization

KW - Gold

KW - Luminescent Measurements

KW - Macromolecular Substances

KW - Materials Testing

KW - Molecular Conformation

KW - Nanotechnology

KW - Particle Size

KW - Quantum Dots

KW - Surface Properties

KW - Temperature

KW - Journal Article

KW - Research Support, Non-U.S. Gov't

U2 - 10.1088/0957-4484/20/18/185501

DO - 10.1088/0957-4484/20/18/185501

M3 - Article

C2 - 19420613

VL - 20

SP - 185501

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 18

ER -

Temperature-modulated quenching of quantum dots covalently coupled to chain ends of poly(N-isopropyl acrylamide) brushes on gold

Abstract

Keywords

UN SDGs

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