In situ functionalization of highly porous polymer microspheres with silver nanoparticles via bio-inspired chemistry

Son, Ho Yeon; Lee, Dong Jae; Lee, Jun Bae; Park, Chun Ho; Seo, Mintae; Jang, Jihui; Kim, Su Ji; Yoon, Moung Seok; Nam, Yoon Sung

doi:10.1039/c4ra08685f

Cited by 32 publications

(25 citation statements)

References 29 publications

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“…Our previous works also demonstrated that Ag ions can be spontaneously reduced to metallic Ag nanoparticles on the surface of pD-coated poly(vinyl alcohol) nanofibers and poly(methyl methacrylate) microparticles [22][23][24] . In this work, the spontaneous reduction of Au 3+ ions was carried out on the surface of the pD-coated PCL nanofibers at an ambient temperature.…”

Section: Resultsmentioning

confidence: 98%

Bioinspired Design of an Immobilization Interface for Highly Stable, Recyclable Nanosized Catalysts

Kim

Son

Yang

et al. 2015

ACS Appl. Mater. Interfaces

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Immobilization of nanometer-sized metal catalysts into porous substrates can stabilize the catalysts and allow their recycled uses, while immobilization often sacrifices the active surface of catalysts and degenerates the local microenvironments, resulting in the reduction of the catalytic activity. To maintain a high activity of immobilized nanocatalysts, it is critically important to design an interface that minimizes the contact area and favors reaction chemistry. Here we report on the application of mussel-inspired adhesion chemistry to the formation of catalytic metal nanocrystal-polydopamine hybrid materials that exhibit a high catalytic efficiency during recycled uses. Electrospun polymer nanofibers are used as a template for in situ formation and immobilization of gold nanoparticles via polydopamine-induced reduction of ionic precursors. The prepared hybrid nanostructures exhibit a recyclable catalytic activity for the reduction of 4-nitrophenol with a turnover frequency of 3.2-5.1 μmol g(-1) min(-1). Repeated uses of the hybrid nanostructures do not significantly alter their morphology, indicating the excellent structural stability of the hybrid nanostructures. We expect that the polydopamine chemistry combined with the on-surface synthesis of catalytic nanocrystals is a promising route to the immobilization of various colloidal nanosized catalysts on supporting substrates for long-term catalysis without the physical instability problem.

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Section: Resultsmentioning

confidence: 98%

Bioinspired Design of an Immobilization Interface for Highly Stable, Recyclable Nanosized Catalysts

Kim

Son

Yang

et al. 2015

ACS Appl. Mater. Interfaces

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“…Venkatesan et al reported the antimicrobial and anticancer activities of porous chitosan-alginate biosynthesized silver nanoparticles [13]. The internal pore surfaces of open porous poly (methyl methacrylate) (PMMA) microspheres were coated with polydopamine for spontaneous reduction of silver nitrates into solid silver nanoparticles (AgNPs) within the pores of the prepared microspheres [14]. Recently carbon-dot wrapped ZnO nanoparticle-based photo-electrochemical sensor for selective monitoring of H 2 O 2 released from cancer cells [15].…”

Section: Introductionmentioning

confidence: 99%

Surface functionalization of porous chitosan microsphere with silver nanoparticle and carbon dot

Dastidar¹,

Saha²,

Dutta³

et al. 2020

Mater. Res. Express

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Porous microspheres have enormous specific surface area due to the presence of micropores. This makes them suitable for all applications that involves surface adsorption e.g. chromatographic separation of biomolecules, catalytic reactions and drug delivery. The surface property may further be tuned up by functionalization of microsphere surface with different nanoparticles like silver nanoparticle and carbon dot (CD). In this study porous chitosan microsphere (PCM) was synthesized by 'phase inversion of emulsion' technique. Silver nanoparticle (AgNP) was synthesized, insitu during the process of surface modification, using silver nitrate solution. CD was synthesized by solvothermal method using urea and EDTA. PCM, AgNP and CD were of ∼9 μm, ∼27 nm and ∼14 nm diameter, respectively. From FTIR study it was confirmed that the amino group of chitosan backbone was responsible for reduction of Ag + ion to Ag°species which were clustered as AgNP and attached to the surface of PCM. The same amino group of chitosan molecule was also responsible for conjugation of CD to the microparticle surface. The optimized AgNP functionalized PCM had 5.36×10 11 AgNP per mg dried mass. The release of AgNP was triggered at pH4.5. The CD functionalized PCM had 56.82±2.8 % conjugation efficiency and 7.83±1.7 % quantum yield with respect to quinine sulphate.

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“…In particular, the use of porous polymeric structures as sacrificial templates for silicification is very attractive due to their large surface area, low bulk density, and structural uniqueness 14 – 21 . Porous polymer structures can be prepared using various techniques, including phase separation 18 , 22 – 24 , porogen leaching 18 , 25 , 26 , gas foaming 27 , electrospinning 20 , 21 , 28 – 31 , and colloidal templating 32 . If metal nanoparticles are incorporated into porous polymer materials with distances of tens of nanometers for plasmonic coupling, silicification can fix the nanostructures while generating ‘negatively replicated’ porous structures that allows the diffusion of analytes to metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…If metal nanoparticles are incorporated into porous polymer materials with distances of tens of nanometers for plasmonic coupling, silicification can fix the nanostructures while generating ‘negatively replicated’ porous structures that allows the diffusion of analytes to metal nanoparticles. Several methods can be used to synthesize the porous metal-polymer hybrid materials, including the chemical reduction of metal ion salts in a polymer matrix, the in situ polymerization in the presence of inorganic nanoparticles, and the dispersion or blending of metal nanoparticles with pre-synthesized polymers 15 , 23 , 26 , 29 , 30 , 33 – 35 .…”

Section: Introductionmentioning

confidence: 99%

“…The mesoporous gold-silica hybrid microspheres prepared by the negative replication method allows the gold surface to be accessible to analytes, making it attractive for SERS applications. The surface functionalization and the following deposition of inorganic materials are based on the oxidative polymerization of catecholamines to polydopamine (pD), which forms a very stable, adhesive protein-like layer 26 , 29 , 30 , 36 , 37 . The catechol moiety of pD can react with amine and thiol groups by Michael-type addition reactions or Schiff-base formations 38 .…”

Section: Introductionmentioning

confidence: 99%

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Bioinspired Synthesis of Mesoporous Gold-silica Hybrid Microspheres as Recyclable Colloidal SERS Substrates

Son

Kim

Lee

et al. 2017

Sci Rep

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Noble metal nanostructures have been intensively investigated as active substrates for surface-enhanced Raman spectroscopy (SERS) from visible to near-IR wavelengths. However, metal nanoparticle-based SERS analysis in solutions is very challenging due to uncontrollable and irreproducible colloid aggregation. Here we report the templated synthesis of porous gold-silica hybrid microspheres and their application as reusable colloidal SERS substrates. Mesoporous polymer microspheres are synthesized and used as templates for the synthesis of non-aggregated gold nanoparticles, followed by polydopamine-mediated silicification to fabricate mesoporous gold-silica hybrid microspheres. The mesoporous hybrid particles detect crystal violet in the order of 10–8 M and provide the structural durability of the immobilized gold nanoparticles, allowing them to be recycled for repeated SERS analyses for analytes in a solution with the similar sensitivity. This work suggests that the mesoporous gold-silica hybrid microspheres are attractive SERS substrates in terms of reusability, sensitivity, and stability.

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In situ functionalization of highly porous polymer microspheres with silver nanoparticles via bio-inspired chemistry

Abstract: Organic–inorganic hybrid porous microparticles.

Cited by 32 publications

References 29 publications

Bioinspired Design of an Immobilization Interface for Highly Stable, Recyclable Nanosized Catalysts

Bioinspired Design of an Immobilization Interface for Highly Stable, Recyclable Nanosized Catalysts

Surface functionalization of porous chitosan microsphere with silver nanoparticle and carbon dot

Bioinspired Synthesis of Mesoporous Gold-silica Hybrid Microspheres as Recyclable Colloidal SERS Substrates

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