Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 610, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125753
Keywords
Chemo-enzymatic synthesis; Oligopeptide; Biomineralization; Mesoporous silica; Metal nanoparticles; Nanocatalysis
Categories
Funding
- Ministry of Science and Technology, Taiwan [MOST 108-2221-E-006-034-MY3, 107-2923-M-006-002-MY3]
- Hierarchical Green-Energy Materials (Hi-GEM) Research Center, from The Featured Areas Research Center Program
- Ministry of Science and Technology in Taiwan [MOST 107-3017-F-006 -003]
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The study demonstrates the feasibility of using chemo-enzymatically prepared peptides for sequentially mediated growth of metal nanoparticles and/or silica mineralization, resulting in colloidal stable silica/peptide particles and mesoporous silica materials. Nanohybrids of metal nanoparticles/silica can be easily fabricated through peptide-mediated nucleation, showing enhanced catalytic activities. This approach provides a promising method for designing peptide materials with specific building blocks for specific applications.
We report the feasibility of using chemo-enzymatically prepared peptides, oligo(L-lysine co-L-tyrosine) (oligoKY) and oligo(L-lysine-co-L-phenylalanine) (oligoKF) for sequentially mediated growth of metal nanoparticles (NPs) and/or silica mineralization. This approach is easy to handle, environmentally benign, and economical as compared to other tedious and multiple-step peptide synthesis approaches. Colloidal stable silica/peptide particles with various sizes between 150 and 430 nm can be simply fabricated by tuning silica precursor concentration via peptide-mediated silica mineralization. Mesoporous silica with pore sizes mostly between 2 and 8 nm can be obtained by replication of sheet-like peptide nano-assemblies. In addition, Au NP/silica and Ag NP/silica nanohybrids can be prepared by peptide-mediated nucleation of metal NPs onto silica/peptide colloidal particles. Silver/palladium (AgPd) alloy-based silica nanohybrids were also prepared via galvanic replacement reaction. The experimental data revealed that these nanohybrids showed reliable and enhanced catalytic activities in reducing 4-nitrophenol, which are primarily dictated by the surface area/size of metal NPs and the accessibility to metal NPs, as well as the mass transfer of chemicals in the porous network. This study demonstrated that chemo-enzymatic polymerization is a promising approach to design peptide materials with designated building blocks for specific applications.
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