M13 Virus-Incorporated Biotemplates on Electrode Surfaces To Nucleate Metal Nanostructures by Electrodeposition

Zhang

et al. 2018

Adv Funct Materials

Microorganisms are widely used as the biotemplates for producing micro/ nanomaterials owing to their unique features, such as exquisite morphology, renewable, and environmentally friendly. However, mass intracellular synthesis of uniformly dispersed nanoparticles (NPs) inside microorganisms is still challenging, especially in a predictable and controllable manner. Here, a facile and efficiency strategy is proposed to controllably produce highly dispersed and surfactant-free Pd@Ag core-shell NPs within the Spirulina platensis (Sp.) cells. In this approach, the Sp. cells' permeability is enhanced by the hydrochloric acid treatment first, which enables the Pd NPs penetrate the cell envelope and distribute uniformly inside the cells, and then they can work as the catalytic seeds for the following electroless silver deposition, resulting in the intracellular fabrication of Pd@Ag core-shell NPs with no agglomeration. The Pd@Ag NPs show excellent catalytic activity (turnover frequency is up to 2893 h −1 for the 6.32 nm Pd@Ag NPs), good stability, and recyclability toward the 4-nitrophenol reductions. The excellent properties are attributed to the asymmetrical core-shell structure, small size, and good dispersion of Pd@Ag NPs. Due to its facility, cost-effectiveness, and versatility, this method can be expanded to other microorganisms, so it opens tremendous opportunities for various metallic nanoparticles intracellular synthesis as well as the practical application.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Facile Fabrication of Highly Dispersed Pd@Ag Core–Shell Nanoparticles Embedded in Spirulina platensis by Electroless Deposition and Their Catalytic Properties

Zhang

et al. 2018

Adv Funct Materials

Bulletin Korean Chem Soc

“…In order to explore the electro-catalytic activity of the fabricated Pt nanoplates, CVs and LSVs were carried out in 0.1 M PBS (pH 7.2) containing aliquots of NO 2 − . 36 Electro-catalytic activities of the modified electrodes were verified by introducing 1 mM of NO 2 − into the electrolyte and the results are represented in Figure 6(B). Among the two electrodes; Au/M/S-LG/Pt electrode displays the higher hydrogen adsorption behaviors ( Figure 6(A, b) around −0.2 V in the positive scan and which is indicative of the higher electrochemically active surface area of the Pt nanoplates.…”

Section: Fabrication Of the Modified Electrodesmentioning

confidence: 99%

Shape‐controlled Electrodeposition of Standing Pt Nanoplates on Gold Substrates as a Sensor Platform for Nitrite Ions

Ahn

Manivannan

Seo

et al. 2019

Self Cite

Electrochemically deposited standing platinum (Pt) nanoplates were fabricated on gold (Au) substrate assisted by the amine functionalized silane and L-glutamic acid (LG) as nucleating and structure directing agents, respectively. Various win over factors responsible for the electrodeposition of the Pt nanoplates was methodologically analyzed. The treatment time with the thiol functionalized silane (M) and the role of LG were found to be decisive for the demonstration of Pt nanoplates display at the Au substrate. Plausible growth mechanism was proposed for the vertical growth and random orientation of the Pt nanoplates. Constructed Pt nanoplates displayed substrate were applied as a sensor platform toward the nitrite ion detection; improved performance was noted than that of the controlled experiments. Furthermore, sensor platform had exhibited recent selectivity toward the nitrite ions from the mixture of possible interferences.

“…In particular, engineering at the biogenic surface to pre‐concentrate the transition metal precursors can influence innovation in different fields, including energy materials and sensor platforms . Among different biogenic scaffolds including viruses, DNA, proteins, and microorganisms, M13 viruses (M13) have shown the various advantages in biotemplating due to its mono‐dispersion, fibrillar morphology, multivalent and tunable structural features, biocompatibility, low‐cost production, and high stability . The functionality of its subunit proteins can be engineered to identify and display peptides that have a good binding affinity and specificity toward target molecules .…”

Section: Figurementioning

confidence: 99%

Electrochemically Co‐deposited Teeth‐like Virus‐Platinum Nanohybrids as an Electrocatalyst for Methanol Oxidation Reaction

2017

Self Cite

M13 virus (M13) as scaffolds has a major appeal, owing to their mono‐dispersed, fibrillar morphology and engineerable surface reactive sites. Herein we had developed a facile electrocatalyst for energy application. Platinum nanostructures are directly co‐deposited from a wild‐type M13 (or) two different engineered M13 mixed electrolytes onto the ITO electrodes. The engineered M13 with 4E peptides could specifically nucleate Pt precursor thereby enables the efficient growth of teeth‐like structures at the ITO electrode. The electrocatalytic activity of the resulting electrocatalyst toward methanol oxidation in alkaline medium was investigated and found enhanced mass activity (0.321 A/mgPt) relative to the catalyst prepared from wild‐type M13, Y3E peptides engineered M13 and without M13. Our novel electrocatalyst fabrication can be extended to other metal and metal oxides and its application might be useful to develop novel clean and green energy generating and storage materials.