Self-assembly of platinum nanochains using octreotide acetate template and their catalytic activity study

Wang, Zi; Xue, Weili; Zhao, Xiaoning; Li, Yanji; Liu, Zhiwei; Gao, Faming; Gao, Dawei

doi:10.1016/j.matlet.2016.01.134

Cited by 8 publications

(9 citation statements)

References 14 publications

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“…The formation of INSAFs (insulin amyloid fibrils) indicates that they can stably exist in subsequent chemical reactions. In addition, the amide sites on the surface of INSAFs could cooperate with the metal salt solution to form metal ion nucleation centers. , It can be seen from the UV–vis test that for pure PtCl 4 and RhCl 3 solution, each has an absorption peak at 258 and 222 nm, respectively, and two appeared for K 2 PdCl 6 solution at 208 and 236 nm. When the INSAFs and the [PtCl x ] 4‑ x , [RhCl x ] 3‑ x , and [PdCl x ] 2‑ x mixture were incubated under acidic conditions, due to the electrostatic interaction between the positively charged functional groups on the inner and outer surfaces of INSAFs and the negative charges of the complex ions in solution, the complexes of [PtCl x ] 4‑ x , [RhCl x ] 3‑ x , and [PdCl x ] 2‑ x were adsorbed on the insulin fibers, which caused the absorption peaks of curves a, b, and c to significantly decrease or even disappear, as shown by curve e. After NaBH 4 was added dropwise, the ions in the solution were reduced to form Pt-Rh-Pd alloy nanoparticles along INSAFs.…”

Section: Resultsmentioning

confidence: 99%

“…A good method is simple and highly controllable. However, at present, most methods need to add surfactants in the preparation of Pt-based alloys to control the morphology and size of the products, so it is difficult to completely remove the surfactants in subsequent processing and they are easy to adsorb on the surface of the alloy particles, which seriously affect the catalytic performance. − The bovine insulin fiber powder can be processed into long and thin insulin fibers with length up to several microns. ,, Also, the insulin fibers can exist stably under low-pH conditions and are good templates for preparing one-dimensional nanostructures. , In this work, we prepared Pt-Rh-Pd alloy particles with a small size of 2 nm and allowed them to grow along the biomolecular insulin fiber template to form uniform and branchless Pt-Rh-Pd nanochains. The in situ growth can overcome the disadvantage of easy agglomeration of nanoparticles and expose more active sites.…”

Section: Introductionmentioning

confidence: 99%

“…34−38 The bovine insulin fiber powder can be processed into long and thin insulin fibers with length up to several microns. 16,23,39 Also, the insulin fibers can exist stably under low-pH conditions and are good templates for preparing one-dimensional nanostructures. 39,40 In this work, we prepared Pt-Rh-Pd alloy particles with a small size of 2 nm and allowed them to grow along the biomolecular insulin fiber template to form uniform and branchless Pt-Rh-Pd nanochains.…”

Section: Introductionmentioning

confidence: 99%

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Synergism of Multicomponent Catalysis: One-Dimensional Pt-Rh-Pd Nanochain Catalysts for Efficient Methanol Oxidation

et al. 2020

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Designing Pt-based alloy catalysts with multicomponent composition and a controllable structure is important to improve the utilization efficiency of precious metals and catalytic activity, but it still face a lot of challenges for simple preparation. Herein, we used insulin amyloid fibrils as templates and their own one-dimensional spiral structure to synthesize Pt-Rh-Pd ternary alloy nanochains under mild conditions. The prepared Pt-Rh-Pd alloy nanochains (NCs) have uniform diameter, and the particle size is only 2 nm. This ultrafine structure increases the specific surface area of the catalyst to a certain extent, and the synergistic effect of the three metals improves the catalytic performance. Compared with commercial Pt/C and binary Pt-Rh NCs, the as-presented Pt-Rh-Pd NCs show better methanol oxidation activity ability and stability against CO poisoning. The peak current density of front sweep is 1.48 mA cm–2, which is 1.7 times higher than that of commercial Pt/C (0.89 mA cm–2) and 1.4 times higher than that of the Pt-Rh NCs (1.07 mA cm–2), indicating great application potential as high-performance electrocatalysts in fuel cells.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergism of Multicomponent Catalysis: One-Dimensional Pt-Rh-Pd Nanochain Catalysts for Efficient Methanol Oxidation

et al. 2020

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“…At present, biomaterials as sustainable resources from nature have received intensive attention of researchers because of their hierarchical organizations and naturally self-assembling characteristics . For instance, versatile biomaterials have been utilized as biological templates or porous supports for the fabrication of nanocatalysts, particularly important for mass transportation in catalysis applications. − Specifically, most of the biomaterials have porous surfaces with abundant organic functional groups and large specific surface areas, and thus they are suitable for loading active nanoparticles and fabricating integrated nanocatalysts. − In addition, biomaterials have other advantages for preparing catalysts, such as good reproducibility, high biocompatibility, easy availability, environmental friendliness, low price, and so forth. , …”

Section: Introductionmentioning

confidence: 99%

Preparation of Integrated CuO/ZnO/OS Nanocatalysts by Using Acid-Etched Oyster Shells as a Support for CO₂ Hydrogenation

Liu

Zhan

et al. 2020

ACS Sustainable Chem. Eng.

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The oyster shell (OS) is a typical biomineralized material from nature containing a large quantity of CaCO3 (approximately 96.23 wt %), which has been extensively used as a template/precursor for fabricating various functional nanomaterials. However, the matrix proteins in the uncalcified layer of the OS structure (approximately 3.75 wt %) are largely ignored during the utilization. In this regard, herein, we focused on the chemical pretreatment of the OS by hydrolysis of matrix proteins with different saturated fatty acids. The obtained acid-etched OS (a-OS) with rich coordination sites (−COOH and −NH2) was then used as a support to load Cu(Zn)-BTC nanoparticles. In particular, a rationally designed Cu(Zn)-BTC/a-OS was synthesized by mixing the a-OS with the precursor solutions under the complexation between the exposed functional groups and the transition-metal ions (Cu2+ and Zn2+). We also prepared CuO/ZnO/a-OS catalysts by calcining Cu(Zn)-BTC/a-OS in air, and their workability was examined in the catalytic CO2 hydrogenation reaction. Interestingly, the CO2 conversion over CuO/ZnO/a-OS increased from 1.9 to 6.6% as compared with CuO/ZnO/OS, and the methanol yield increased from 1.3 to 4.2%. We demonstrated that the acidity and chemical structure of the saturated fatty acids played a comprehensive role in determining the hydrolysis of matrix proteins of the OS (viz., etching degree), which significantly affected the catalytic activity. It was found that the activity of a-OS-supported catalysts increased in the following sequence: benzoic acid < dodecanoic acid < acetic acid < palmitic acid < stearic acid. Accordingly, we have developed an efficient and green route to prepare supported CuO/ZnO nanocatalysts by using the cheap and ecofriendly OS powder as a support.

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“…It is possible to rationally control the architectural organization of plasmonic metal by designing the structure of peptides and regulating the process of corresponding mineralizing. OCT (Figure S1) has been proved to be a template to mediate the growth of inorganic substances, because it possesses multiple coordination sites (e.g., amino, hydroxy and imidazole groups) to strongly bind metal surfaces and control their growth. − Meanwhile, OCT shows good biocompatibility and a long half-life period and has been used as the targeting bullet to anchor cancer cells …”

Section: Introductionmentioning

confidence: 99%

Peptide-Directed Hierarchical Mineralized Silver Nanocages for Anti-Tumor Photothermal Therapy

Bian

Zhang

et al. 2018

ACS Sustainable Chem. Eng.

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The size and morphology of metals determine their plasmon resonances. How to elegantly tune their architectures to obtain optical properties as required (e.g., strong absorption in the near-infrared (NIR) wavelengths) is a bottleneck for phototherapy. Inspired by biomineralization, we develop a simple but robust strategy to fabricate silver nanocages (Ag NCs) based on peptide-directed mineralization of silver. The Ag NCs are organic–inorganic hybrids with octreotide (OCT) templated decoration of Ag shells that are composed of Ag NPs. This hierarchical organization makes Ag NPs get together in close proximity, which facilitates ultrastrong plasmonic coupling to shift the resonant excitation from the visible (420 nm) to the NIR region (810 nm). In addition, the surface plasmon resonance peak of the Ag NCs in the NIR region can be subtly tuned by varying the volume of added silver nitrate (AgNO3) to control the size and morphology of mineralized Ag NCs. The Ag NCs have a light-to-heat conversion efficiency of 46.1%, which is to our knowledge the highest among Ag-based photothermal agents (PTAs). The Ag NCs can selectively induce death of cancer cells in vitro under NIR irradiation at 808 nm and show improved cytocompatibility for normal cells relative to pure Ag NPs. Following intratumor injection into uterine cervix cancer cells (U14) tumor-bearing mice, Ag NCs exert remarkable antitumor performance with tumor killing efficacy up to 82.7% and good biocompatibility in photothermal therapy, suggesting their potential application to work as photothermal nanomedicine for cancer therapy.

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Self-assembly of platinum nanochains using octreotide acetate template and their catalytic activity study

Cited by 8 publications

References 14 publications

Synergism of Multicomponent Catalysis: One-Dimensional Pt-Rh-Pd Nanochain Catalysts for Efficient Methanol Oxidation

Synergism of Multicomponent Catalysis: One-Dimensional Pt-Rh-Pd Nanochain Catalysts for Efficient Methanol Oxidation

Preparation of Integrated CuO/ZnO/OS Nanocatalysts by Using Acid-Etched Oyster Shells as a Support for CO₂ Hydrogenation

Peptide-Directed Hierarchical Mineralized Silver Nanocages for Anti-Tumor Photothermal Therapy

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Self-assembly of platinum nanochains using octreotide acetate template and their catalytic activity study

Cited by 8 publications

References 14 publications

Synergism of Multicomponent Catalysis: One-Dimensional Pt-Rh-Pd Nanochain Catalysts for Efficient Methanol Oxidation

Synergism of Multicomponent Catalysis: One-Dimensional Pt-Rh-Pd Nanochain Catalysts for Efficient Methanol Oxidation

Preparation of Integrated CuO/ZnO/OS Nanocatalysts by Using Acid-Etched Oyster Shells as a Support for CO2 Hydrogenation

Peptide-Directed Hierarchical Mineralized Silver Nanocages for Anti-Tumor Photothermal Therapy

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Preparation of Integrated CuO/ZnO/OS Nanocatalysts by Using Acid-Etched Oyster Shells as a Support for CO₂ Hydrogenation