Bimetallic Pt/Pd nanoparticles in sol–gel-derived silica films and xerogels

Gubanova, N. N.; Матвеев, В. А.; Шилова, О. А.

doi:10.1007/s10971-019-04971-y

Cited by 9 publications

(7 citation statements)

References 34 publications

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“…The results confirmed that PDA was successfully coated on the Fe 3 O 4 composite. Figure bIII,VII illustrates that abundant Pd/Pt NPs with (111) facet (0.22 nm, Figure S5) , were deposited on the surface of the Fe 3 O 4 @PDA composite. PDA coating had a large amount of positively charged sites from the nitrogen-containing functional groups, which exhibited an excellent metal-binding ability for absorbing PtCl 6 2– /PdCl 4 2– ions onto the surface of the Fe 3 O 4 @PDA composite.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of PDA-Mediated Magnetic Bimetallic Nanozyme and Its Application in Immunochromatographic Assay

Lai

Zhang

Zeng

et al. 2020

ACS Appl. Mater. Interfaces

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Immunochromatographic assay (ICA) is widely applied in various fields. However, severe matrix interference and weak signal output present major challenges in achieving accurate and ultrasensitive detection in ICA. Here, a polydopamine (PDA)-mediated magnetic bimetallic nanozyme (Fe 3 O 4 @PDA@Pd/Pt) with peroxidase-like activity was synthesized and used as a probe in ICA. The magnetic property of Fe 3 O 4 @PDA@Pd/Pt enabled effective magnetic enrichment of targets, thereby reducing the matrix interference in the sample. PDA coating on the magnetic bimetallic nanozyme was employed as a mediator and a stabilizer. It improved the catalytic ability and stability of the magnetic bimetallic nanozyme by providing more coordination sites for Pd/Pt growth and functional groups (−NH and −OH). In addition, the Pd/Pt bimetallic synergistic effect could further enhance the catalytic ability of the nanozyme. A method was developed by integrating Fe 3 O 4 , PDA, and Pd/Pt into Fe 3 O 4 @PDA@Pd/Pt as a probe in ICA. With the proposed method, human chorionic gonadotropin and Escherichia coli O157:H7 were successfully detected to be as low as 0.0094 mIU/mL in human blood serum and 9 × 10 1 CFU/mL in the milk sample, respectively. This method may be readily adapted for accurate and ultrasensitive detection of other biomolecules in various fields.

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Section: Resultsmentioning

confidence: 99%

Synthesis of PDA-Mediated Magnetic Bimetallic Nanozyme and Its Application in Immunochromatographic Assay

Lai

Zhang

Zeng

et al. 2020

ACS Appl. Mater. Interfaces

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“…The lattice parameters in such crystallites depend on the ratio of Pt and Pd in the initial sol. The crystallite size was 5-6 nm in the films and 10-17 nm in the xerogels obtained under identical technological conditions from the same sol [13].…”

Section: Introductionmentioning

confidence: 89%

“…The sols were obtained according to the procedure developed in our earlier studies and described in detail in [11,13]. The ratios between the components (platinum, palladium and silica) in the solution (mol.%) are shown in Table 1.…”

Section: Silica Sol Synthesis and Spin-on Glass Film Formationmentioning

confidence: 99%

Pt and Pd Nanoparticle Crystallization in the Sol-Gel-Derived Thin SiO2 Films

Gubanova,

Matveev,

Grebenshchikova

et al. 2023

Physchem

Self Cite

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The crystallization and distribution the features of Pt, Pd and Pt/Pd nanoparticles in spin-on glass SiO2 films were studied within a wide range of the dopant concentrations in silica sol (from 10 to 80 mol.% Pt, Pd or Pt/Pd per 100 mol.% Si). The grazing incidence X-ray diffraction (GIXRD) characterization revealed that the formation of 4–8 nm sized crystalline Pt, Pd and Pt/Pd nanoparticles in SiO2 films began at the dopant concentrations of at least 10 mol.% Pt and/or Pd per 100 mol.% Si. The nanoparticles obtained from sols with the lower Pt, Pd or Pt/Pd concentrations were characterized by an amorphous structure. The dopants distribution over the film thickness (~21–47 nm) was studied using X-ray reflectometry. The effect of the dopant concentration, spin-coating modes and heat treatment temperature on the film thickness was characterized. When only one of the dopants (Pt or Pd) was introduced into the silica sol, the resulting nanoparticles were preferentially localized close to the film surface. When dopants were used together, the Pt/Pd nanoparticles were distributed more evenly.

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“…The magnetic properties were studied using SQUID magnetometry and the Cu-Ni bimetallic nanoparticle shows a ferromagnetic behavior. Other bimetallic nanoparticles synthesized using sol-gel method include Mg-Al [103], Pt-Pd [104], and Au-M (M = Ag, Pd, Pt) [105].…”

Section: Sol-gel Methodsmentioning

confidence: 99%

Synthesis of Bimetallic Nanoparticles and Applications—An Updated Review

Idris

Roy

2023

Crystals

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The manipulation of matter at the atomic level (nanotechnology) has experienced an explosion in research interest in recent years. Bimetallic nanoparticles are vital due to their high biocompatibility, stability and comparatively less toxicity. The synthesis methods that include physical, chemical and biological methods are explored and explained in detail, along with their advantages. They have a wide range of applications due to their synergistic properties including biological applications (in medicine and agriculture), environmental application (in water treatment and removal of toxic contaminants), engineering application (in nanosensors, nanochips and nano-semiconductors) and chemical and physical application (in optics, catalysis and paints). The green synthesis approach is a promising method of synthesis that can give rise to more biocompatible and less toxic bimetallic nanoparticles due to increasing environmental pollution. However, despite these interesting attributes of bimetallic nanoparticle, there is still much work to be done to improve the biocompatibility of bimetallic nanoparticles because of their toxicity and potentially hazardous effects.

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Bimetallic Pt/Pd nanoparticles in sol–gel-derived silica films and xerogels

Cited by 9 publications

References 34 publications

Synthesis of PDA-Mediated Magnetic Bimetallic Nanozyme and Its Application in Immunochromatographic Assay

Synthesis of PDA-Mediated Magnetic Bimetallic Nanozyme and Its Application in Immunochromatographic Assay

Pt and Pd Nanoparticle Crystallization in the Sol-Gel-Derived Thin SiO2 Films

Synthesis of Bimetallic Nanoparticles and Applications—An Updated Review

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