Facile Functionalization of Polymer Surfaces in Aqueous and Polar Organic Solvents via 3-Mercaptopropylsilatrane

Yen Ta Tseng, Hsin Yu Lu, Jie Ren Li, Wan Ju Tung, Wen Hao Chen, Lai Kwan Chau

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Surface modification of a polymer substrate with a mercapto functionality is crucial in many applications such as flexible circuitry and point-of-care biosensors. We present here a novel bifunctional molecular adhesive, 3-mercaptopropylsilatrane (MPS), as an interface between polymer and metal surfaces. Under ambient conditions, surface modification of polymer surfaces with a mercapto functionality can be achieved with low concentration (0.46 mM) of MPS in aqueous solvent (50% ethanol) in a short time (<30 min). Three popular polymers for optical sensors, polycarbonate, polyethylene terephthalate, and poly(methyl methacrylate), were employed as substrates, and MPS films formed on these substrates were examined and compared with that on a glass substrate. The films were characterized by UV-vis spectroscopy, water contact angle, X-ray photoelectron spectroscopy, and atomic force microscopy. MPS was also used as a bifunctional linker for the construction of a gold nanoparticle (AuNP) sub-monolayer on these polymer surfaces. Under optimized preparation conditions, the absorbance and full width at half-maximum of the plasmon band are comparable to those of a AuNP-modified glass substrate. Hence, MPS may have a potential to be a key component in polymer substrate-based localized surface plasmon resonance sensors. A self-catalytic surface reaction mechanism is also proposed to account for the results. As compared to a glass surface with a high number of silanol groups, the successful formation of an MPS film on polymer surfaces with relatively few reactive sites is probably due to the lateral polymerization of MPS starting from a condensed MPS molecule on a reactive site of a polymer surface.

Original languageEnglish
Pages (from-to)34159-34169
Number of pages11
JournalACS Applied Materials and Interfaces
Volume8
Issue number49
DOIs
Publication statusPublished - 2016 Dec 14

Fingerprint

Organic solvents
Polymers
Substrates
polycarbonate
Glass
Surface treatment
Polyethylene Terephthalates
Optical sensors
Surface reactions
Surface plasmon resonance
Polymethyl Methacrylate
Polycarbonates
Full width at half maximum
Ultraviolet spectroscopy
Polymethyl methacrylates
Biosensors
Gold
Polyethylene terephthalates
Contact angle
Monolayers

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Tseng, Yen Ta ; Lu, Hsin Yu ; Li, Jie Ren ; Tung, Wan Ju ; Chen, Wen Hao ; Chau, Lai Kwan. / Facile Functionalization of Polymer Surfaces in Aqueous and Polar Organic Solvents via 3-Mercaptopropylsilatrane. In: ACS Applied Materials and Interfaces. 2016 ; Vol. 8, No. 49. pp. 34159-34169.
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Facile Functionalization of Polymer Surfaces in Aqueous and Polar Organic Solvents via 3-Mercaptopropylsilatrane. / Tseng, Yen Ta; Lu, Hsin Yu; Li, Jie Ren; Tung, Wan Ju; Chen, Wen Hao; Chau, Lai Kwan.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 49, 14.12.2016, p. 34159-34169.

Research output: Contribution to journalArticle

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AU - Tseng, Yen Ta

AU - Lu, Hsin Yu

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AU - Chen, Wen Hao

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AB - Surface modification of a polymer substrate with a mercapto functionality is crucial in many applications such as flexible circuitry and point-of-care biosensors. We present here a novel bifunctional molecular adhesive, 3-mercaptopropylsilatrane (MPS), as an interface between polymer and metal surfaces. Under ambient conditions, surface modification of polymer surfaces with a mercapto functionality can be achieved with low concentration (0.46 mM) of MPS in aqueous solvent (50% ethanol) in a short time (<30 min). Three popular polymers for optical sensors, polycarbonate, polyethylene terephthalate, and poly(methyl methacrylate), were employed as substrates, and MPS films formed on these substrates were examined and compared with that on a glass substrate. The films were characterized by UV-vis spectroscopy, water contact angle, X-ray photoelectron spectroscopy, and atomic force microscopy. MPS was also used as a bifunctional linker for the construction of a gold nanoparticle (AuNP) sub-monolayer on these polymer surfaces. Under optimized preparation conditions, the absorbance and full width at half-maximum of the plasmon band are comparable to those of a AuNP-modified glass substrate. Hence, MPS may have a potential to be a key component in polymer substrate-based localized surface plasmon resonance sensors. A self-catalytic surface reaction mechanism is also proposed to account for the results. As compared to a glass surface with a high number of silanol groups, the successful formation of an MPS film on polymer surfaces with relatively few reactive sites is probably due to the lateral polymerization of MPS starting from a condensed MPS molecule on a reactive site of a polymer surface.

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